RAID5 -> RAID6

RAID5 -> RAID6

[Max Waterman]

Hi,

I'm wondering what the latest is on migrating from RAID5 to RAID6.

I have a 6 disk RAID5 with 2 spares and have long been thinking of 
making better use of the spares. All 200GB.

I have a 1TB drive that is serving as a backup, but I wonder if there's 
a way to migrate without having to wipe the array.

Any advice?

Max.

Re: RAID5 -> RAID6

[NeilBrown]

On Sun, March 29, 2009 12:05 am, Max Waterman wrote:
> Hi,
>
> I'm wondering what the latest is on migrating from RAID5 to RAID6.
>
> I have a 6 disk RAID5 with 2 spares and have long been thinking of
> making better use of the spares. All 200GB.
>
> I have a 1TB drive that is serving as a backup, but I wonder if there's
> a way to migrate without having to wipe the array.
>
> Any advice?

Wait 3 months :-)

2.6.30 should contains support for this sort of conversion.  It is
already written (mostly) but still needs some testing.


Your options would then include:
 1/  convert that raid5 to a raid6 of the same size but with one
     extra device.  This device would store all the 'Q' blocks so
     it could become a write bottle neck
 1a/ as above, but then restripe the array so that the Q block is
     rotated among the drives.  This process is either dangerous - in
     that a crash would kill your data, or slow - in that all the data
     would need to be copied elsewhere in chunks while the corresponding
     chunk of the array was restriped.
 2/  convert to raid6 and grow at the same time.  i.e. add both spares
     using one of them to support the conversion to raid6 and the
     other to increase the space.  You could then arrange to restripe
     an grow at the same time which is faster/safer than striping in-place.
 3/  Possibly you could restripe-and-grow, then restripe-and-shrink
     so you end up with a 7 device RAID6 with properly rotating parity,
     but don't go through the slow/dangerous restripe-in-place.
     I'll need to do some experiments to see if that would actually
     be faster.

NeilBrown

Re: RAID5 -> RAID6

[Max Waterman]

NeilBrown wrote:
> Wait 3 months :-)
>   

Sounds good. I'm in no particular hurry. Increasing capacity would be 
nice, but I'm not sure I want to do that since I only have a 1TB drive 
for backup...as such, the slow version of 1a/ sounds reasonable - I have 
a spare 80GB drive in the same machine that I could make use of to make 
it not-so-dangerous.

I guess I might consider a grow too - perhaps I'll have another drive by 
then so my backup can be bigger.

Thanks for the advice...I'll keep an eye out for the new support.

Max.

> 2.6.30 should contains support for this sort of conversion.  It is
> already written (mostly) but still needs some testing.
>
>
> Your options would then include:
>  1/  convert that raid5 to a raid6 of the same size but with one
>      extra device.  This device would store all the 'Q' blocks so
>      it could become a write bottle neck
>  1a/ as above, but then restripe the array so that the Q block is
>      rotated among the drives.  This process is either dangerous - in
>      that a crash would kill your data, or slow - in that all the data
>      would need to be copied elsewhere in chunks while the corresponding
>      chunk of the array was restriped.
>  2/  convert to raid6 and grow at the same time.  i.e. add both spares
>      using one of them to support the conversion to raid6 and the
>      other to increase the space.  You could then arrange to restripe
>      an grow at the same time which is faster/safer than striping in-place.
>  3/  Possibly you could restripe-and-grow, then restripe-and-shrink
>      so you end up with a 7 device RAID6 with properly rotating parity,
>      but don't go through the slow/dangerous restripe-in-place.
>      I'll need to do some experiments to see if that would actually
>      be faster

(unknown),

[Leslie Rhorer]

I am running mdadm 2.6.7.2-1, and 2.6.7.2-3 is available under my distro.
Do either of these versions support reshaping an array from RAID5 to RAID6?
Does any later version?

Re:

[Neil Brown]

On Sun, 7 Mar 2010 19:37:15 -0600
"Leslie Rhorer" <lrhorer@satx.rr.com> wrote:

> I am running mdadm 2.6.7.2-1, and 2.6.7.2-3 is available under my distro.
> Do either of these versions support reshaping an array from RAID5 to RAID6?

No

> Does any later version?

Yes.


You need mdadm-3.1.1 plus linux 2.6.32.

NeilBrown

> 
> --
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RE:

[Leslie Rhorer]

	Thanks, Neil.  I guess I'll just tear it down and rebuild.  Debian
"Squeeze" is definitely not ready for prime time, and I don't think even it
supplies kernel 2.6.32 or mdadm 3.1.1.  Oh, well.

> -----Original Message-----
> From: Neil Brown [mailto:neilb@suse.de]
> Sent: Sunday, March 07, 2010 7:53 PM
> To: Leslie Rhorer
> Cc: linux-raid@vger.kernel.org
> Subject: Re:
> 
> On Sun, 7 Mar 2010 19:37:15 -0600
> "Leslie Rhorer" <lrhorer@satx.rr.com> wrote:
> 
> > I am running mdadm 2.6.7.2-1, and 2.6.7.2-3 is available under my
> distro.
> > Do either of these versions support reshaping an array from RAID5 to
> RAID6?
> 
> No
> 
> > Does any later version?
> 
> Yes.
> 
> 
> You need mdadm-3.1.1 plus linux 2.6.32.
> 
> NeilBrown
> 
> >
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-raid" in
> > the body of a message to majordomo@vger.kernel.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re:

[Michael Evans]

On Sun, Mar 7, 2010 at 6:01 PM, Leslie Rhorer <lrhorer@satx.rr.com> wrote:
>        Thanks, Neil.  I guess I'll just tear it down and rebuild.  Debian
> "Squeeze" is definitely not ready for prime time, and I don't think even it
> supplies kernel 2.6.32 or mdadm 3.1.1.  Oh, well.
>
>> -----Original Message-----
>> From: Neil Brown [mailto:neilb@suse.de]
>> Sent: Sunday, March 07, 2010 7:53 PM
>> To: Leslie Rhorer
>> Cc: linux-raid@vger.kernel.org
>> Subject: Re:
>>
>> On Sun, 7 Mar 2010 19:37:15 -0600
>> "Leslie Rhorer" <lrhorer@satx.rr.com> wrote:
>>
>> > I am running mdadm 2.6.7.2-1, and 2.6.7.2-3 is available under my
>> distro.
>> > Do either of these versions support reshaping an array from RAID5 to
>> RAID6?
>>
>> No
>>
>> > Does any later version?
>>
>> Yes.
>>
>>
>> You need mdadm-3.1.1 plus linux 2.6.32.
>>
>> NeilBrown
>>
>> >
>> > --
>> > To unsubscribe from this list: send the line "unsubscribe linux-raid" in
>> > the body of a message to majordomo@vger.kernel.org
>> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
>
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-raid" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>

What are you talking about?  Have you not synced to the online
repository?  I grabbed this out of the Package.bz2 file.

(Yes, BTW, they should probably have a bug filed to get mdadm 3.1
included before the freeze...)

Package: mdadm
Priority: optional
Section: admin
Installed-Size: 1064
Maintainer: Debian mdadm maintainers <pkg-mdadm-devel@lists.alioth.debian.org>
Architecture: i386
Version: 3.0.3-2
Replaces: mdctl
Depends: libc6 (>= 2.3.3), udev | makedev, debconf (>= 1.4.72),
lsb-base (>= 3.1-6)
Recommends: default-mta | mail-transport-agent, module-init-tools
Conflicts: initramfs-tools (<< 0.65), mdctl (<< 0.7.2), raidtools2 (<<
1.00.3-12.1)
Filename: pool/main/m/mdadm/mdadm_3.0.3-2_i386.deb
Size: 418426
MD5sum: ab27fb8bfde438bc76dcb42ce8717626
SHA1: a89f1b90ac08bcf29c6c49cc310db0823edf8562
SHA256: 5f9fae56cba6aa6dbb747ddf86402615319d32f3d692da64a818f0f1fab399af
Description: tool to administer Linux MD arrays (software RAID)
 The mdadm utility can be used to create, manage, and monitor MD
 (multi-disk) arrays for software RAID or multipath I/O.
 .
 This package automatically configures mdadm to assemble arrays during the
 system startup process. If not needed, this functionality can be disabled.
Homepage: http://neil.brown.name/blog/mdadm
Tag: admin::boot, admin::configuring, hardware::storage,
implemented-in::c, implemented-in::shell, interface::commandline,
interface::daemon, role::program, scope::utility, use::configuring,
use::monitor


Package: linux-image-2.6.32-trunk-686
Priority: optional
Section: kernel
Installed-Size: 74220
Maintainer: Debian Kernel Team <debian-kernel@lists.debian.org>
Architecture: i386
Source: linux-2.6
Version: 2.6.32-5
Provides: linux-image, linux-image-2.6, linux-modules-2.6.32-trunk-686
Depends: module-init-tools, initramfs-tools (>= 0.55) | linux-initramfs-tool
Pre-Depends: debconf | debconf-2.0
Recommends: firmware-linux-free (>= 2.6.32), libc6-i686
Suggests: linux-doc-2.6.32, grub | lilo
Conflicts: initramfs-tools (<< 0.55)
Filename: pool/main/l/linux-2.6/linux-image-2.6.32-trunk-686_2.6.32-5_i386.deb
Size: 26282748
MD5sum: 776c9e57322b9e154bcc0518a9224df3
SHA1: 210cc48a91120ebd36cb20d9516e6e34e4c52da4
SHA256: bf8e8936cacf902b09dde1950bf10dcf50b1cceeeb4d1c351250a5c13da42e83
Description: Linux 2.6.32 for modern PCs
 The Linux kernel 2.6.32 and modules for use on PCs with Intel Pentium
 Pro/II/III/4/4M/D/M, Xeon, Celeron, Core or Atom; AMD K6, Geode LX/NX,
 Athlon (K7), Duron, Opteron, Sempron, Turion or Phenom; Transmeta
 Efficeon; VIA C3 "Nehemiah" or C7 processors.
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RE:

[Leslie Rhorer]

> -----Original Message-----
> From: linux-raid-owner@vger.kernel.org [mailto:linux-raid-
> owner@vger.kernel.org] On Behalf Of Michael Evans
> Sent: Sunday, March 07, 2010 8:22 PM
> To: Leslie Rhorer
> Cc: Neil Brown; linux-raid@vger.kernel.org
> Subject: Re:
> 
> On Sun, Mar 7, 2010 at 6:01 PM, Leslie Rhorer <lrhorer@satx.rr.com> wrote:
> >        Thanks, Neil.  I guess I'll just tear it down and rebuild.
>  Debian
> > "Squeeze" is definitely not ready for prime time, and I don't think even
> it
> > supplies kernel 2.6.32 or mdadm 3.1.1.  Oh, well.
> >
> >> -----Original Message-----
> >> From: Neil Brown [mailto:neilb@suse.de]
> >> Sent: Sunday, March 07, 2010 7:53 PM
> >> To: Leslie Rhorer
> >> Cc: linux-raid@vger.kernel.org
> >> Subject: Re:
> >>
> >> On Sun, 7 Mar 2010 19:37:15 -0600
> >> "Leslie Rhorer" <lrhorer@satx.rr.com> wrote:
> >>
> >> > I am running mdadm 2.6.7.2-1, and 2.6.7.2-3 is available under my
> >> distro.
> >> > Do either of these versions support reshaping an array from RAID5 to
> >> RAID6?
> >>
> >> No
> >>
> >> > Does any later version?
> >>
> >> Yes.
> >>
> >>
> >> You need mdadm-3.1.1 plus linux 2.6.32.
> >>
> >> NeilBrown
> >>
> >> >
> >> > --
> >> > To unsubscribe from this list: send the line "unsubscribe linux-raid"
> in
> >> > the body of a message to majordomo@vger.kernel.org
> >> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> >
> >
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-raid" in
> > the body of a message to majordomo@vger.kernel.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> >
> 
> What are you talking about?

	Referring to what, specifically?

> Have you not synced to the online
> repository?  I grabbed this out of the Package.bz2 file.

	Of course.  I'm running "Lenny" for an AMD-64.  The output below is
definitely not for AMD-64, and it looks to me like it might be "Squeeze" or
"Sid", not "Lenny".

From the "Lenny" AMD-64 Package.bz2 file:

Package: mdadm
Priority: optional
Section: admin
Installed-Size: 776
Maintainer: Debian mdadm maintainers
<pkg-mdadm-devel@lists.alioth.debian.org>
Architecture: amd64
Version: 2.6.7.2-3
Replaces: mdctl
Depends: libc6 (>= 2.7-1), udev | makedev, debconf (>= 1.4.72), lsb-base (>=
3.1-6)
Recommends: exim4 | mail-transport-agent, module-init-tools
Conflicts: initramfs-tools (<< 0.65), mdctl (<< 0.7.2), raidtools2 (<<
1.00.3-12.1)
Filename: pool/main/m/mdadm/mdadm_2.6.7.2-3_amd64.deb
Size: 273876
MD5sum: a3755364dcc80be5d940a3d423eb55a9
SHA1: a0ee5083f213f70bbb96cb8fd5b2f89a5cb8ddd3
SHA256: 10add842a74034592b8647c8e70a69502e3d915413a7da640c0172d02ef9ee7d
Description: tool to administer Linux MD arrays (software RAID)
 The mdadm utility can be used to create, manage, and monitor MD
 (multi-disk) arrays for software RAID or multipath I/O.
 .
 This package automatically configures mdadm to assemble arrays during the
 system startup process. If not needed, this functionality can be disabled.
Homepage: http://neil.brown.name/blog/mdadm
Tag: admin::boot, admin::configuring, hardware::storage, implemented-in::c,
implemented-in::shell, interface::commandline, interface::daemon,
role::program, scope::utility, use::configuring, use::monitor


	"Lenny" i386 lists the same thing.
 
> (Yes, BTW, they should probably have a bug filed to get mdadm 3.1
> included before the freeze...)
> 
> Package: mdadm
> Priority: optional
> Section: admin
> Installed-Size: 1064
> Maintainer: Debian mdadm maintainers <pkg-mdadm-
> devel@lists.alioth.debian.org>
> Architecture: i386
> Version: 3.0.3-2
> Replaces: mdctl
> Depends: libc6 (>= 2.3.3), udev | makedev, debconf (>= 1.4.72),
> lsb-base (>= 3.1-6)
> Recommends: default-mta | mail-transport-agent, module-init-tools
> Conflicts: initramfs-tools (<< 0.65), mdctl (<< 0.7.2), raidtools2 (<<
> 1.00.3-12.1)
> Filename: pool/main/m/mdadm/mdadm_3.0.3-2_i386.deb
> Size: 418426
> MD5sum: ab27fb8bfde438bc76dcb42ce8717626
> SHA1: a89f1b90ac08bcf29c6c49cc310db0823edf8562
> SHA256: 5f9fae56cba6aa6dbb747ddf86402615319d32f3d692da64a818f0f1fab399af
> Description: tool to administer Linux MD arrays (software RAID)
>  The mdadm utility can be used to create, manage, and monitor MD
>  (multi-disk) arrays for software RAID or multipath I/O.
>  .
>  This package automatically configures mdadm to assemble arrays during the
>  system startup process. If not needed, this functionality can be
> disabled.
> Homepage: http://neil.brown.name/blog/mdadm
> Tag: admin::boot, admin::configuring, hardware::storage,
> implemented-in::c, implemented-in::shell, interface::commandline,
> interface::daemon, role::program, scope::utility, use::configuring,
> use::monitor
> 
> 
> Package: linux-image-2.6.32-trunk-686
> Priority: optional
> Section: kernel
> Installed-Size: 74220
> Maintainer: Debian Kernel Team <debian-kernel@lists.debian.org>
> Architecture: i386
> Source: linux-2.6
> Version: 2.6.32-5
> Provides: linux-image, linux-image-2.6, linux-modules-2.6.32-trunk-686
> Depends: module-init-tools, initramfs-tools (>= 0.55) | linux-initramfs-
> tool
> Pre-Depends: debconf | debconf-2.0
> Recommends: firmware-linux-free (>= 2.6.32), libc6-i686
> Suggests: linux-doc-2.6.32, grub | lilo
> Conflicts: initramfs-tools (<< 0.55)
> Filename: pool/main/l/linux-2.6/linux-image-2.6.32-trunk-686_2.6.32-
> 5_i386.deb
> Size: 26282748
> MD5sum: 776c9e57322b9e154bcc0518a9224df3
> SHA1: 210cc48a91120ebd36cb20d9516e6e34e4c52da4
> SHA256: bf8e8936cacf902b09dde1950bf10dcf50b1cceeeb4d1c351250a5c13da42e83
> Description: Linux 2.6.32 for modern PCs
>  The Linux kernel 2.6.32 and modules for use on PCs with Intel Pentium
>  Pro/II/III/4/4M/D/M, Xeon, Celeron, Core or Atom; AMD K6, Geode LX/NX,
>  Athlon (K7), Duron, Opteron, Sempron, Turion or Phenom; Transmeta
>  Efficeon; VIA C3 "Nehemiah" or C7 processors.
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> To unsubscribe from this list: send the line "unsubscribe linux-raid" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

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RAID5 - RAID6

[Leslie Rhorer]

> > >> You need mdadm-3.1.1 plus linux 2.6.32.
> > >>
> > >> NeilBrown
> > >>
> > >> >
> > >> > --
> > >> > To unsubscribe from this list: send the line "unsubscribe linux-
> raid"
> > in
> > >> > the body of a message to majordomo@vger.kernel.org
> > >> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> > >
> > >
> > > --
> > > To unsubscribe from this list: send the line "unsubscribe linux-raid"
> in
> > > the body of a message to majordomo@vger.kernel.org
> > > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> > >
> >
> > What are you talking about?
> 
> 	Referring to what, specifically?
> 
> > Have you not synced to the online
> > repository?  I grabbed this out of the Package.bz2 file.
> 
> 	Of course.  I'm running "Lenny" for an AMD-64.  The output below is
> definitely not for AMD-64, and it looks to me like it might be "Squeeze"
> or
> "Sid", not "Lenny".
> 
> >From the "Lenny" AMD-64 Package.bz2 file:

	Digging a bit further, even "Squeeze" does not offer mdadm 3.1.1, at
least not in the AMD-64 distro.  It's included version at the moment is
3.0.3-2.

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Re:

[Michael Evans]

On Sun, Mar 7, 2010 at 7:20 PM, Leslie Rhorer <lrhorer@satx.rr.com> wrote:
>
>
>> -----Original Message-----
>> From: linux-raid-owner@vger.kernel.org [mailto:linux-raid-
>> owner@vger.kernel.org] On Behalf Of Michael Evans
>> Sent: Sunday, March 07, 2010 8:22 PM
>> To: Leslie Rhorer
>> Cc: Neil Brown; linux-raid@vger.kernel.org
>> Subject: Re:
>>
>> On Sun, Mar 7, 2010 at 6:01 PM, Leslie Rhorer <lrhorer@satx.rr.com> wrote:
>> >        Thanks, Neil.  I guess I'll just tear it down and rebuild.
>>  Debian
>> > "Squeeze" is definitely not ready for prime time, and I don't think even
>> it
>> > supplies kernel 2.6.32 or mdadm 3.1.1.  Oh, well.
>> >
>> >> -----Original Message-----
>> >> From: Neil Brown [mailto:neilb@suse.de]
>> >> Sent: Sunday, March 07, 2010 7:53 PM
>> >> To: Leslie Rhorer
>> >> Cc: linux-raid@vger.kernel.org
>> >> Subject: Re:
>> >>
>> >> On Sun, 7 Mar 2010 19:37:15 -0600
>> >> "Leslie Rhorer" <lrhorer@satx.rr.com> wrote:
>> >>
>> >> > I am running mdadm 2.6.7.2-1, and 2.6.7.2-3 is available under my
>> >> distro.
>> >> > Do either of these versions support reshaping an array from RAID5 to
>> >> RAID6?
>> >>
>> >> No
>> >>
>> >> > Does any later version?
>> >>
>> >> Yes.
>> >>
>> >>
>> >> You need mdadm-3.1.1 plus linux 2.6.32.
>> >>
>> >> NeilBrown
>> >>
>> >> >
>> >> > --
>> >> > To unsubscribe from this list: send the line "unsubscribe linux-raid"
>> in
>> >> > the body of a message to majordomo@vger.kernel.org
>> >> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
>> >
>> >
>> > --
>> > To unsubscribe from this list: send the line "unsubscribe linux-raid" in
>> > the body of a message to majordomo@vger.kernel.org
>> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
>> >
>>
>> What are you talking about?
>
>        Referring to what, specifically?
>
>> Have you not synced to the online
>> repository?  I grabbed this out of the Package.bz2 file.
>
>        Of course.  I'm running "Lenny" for an AMD-64.  The output below is
> definitely not for AMD-64, and it looks to me like it might be "Squeeze" or
> "Sid", not "Lenny".
>
> From the "Lenny" AMD-64 Package.bz2 file:
>
> Package: mdadm
> Priority: optional
> Section: admin
> Installed-Size: 776
> Maintainer: Debian mdadm maintainers
> <pkg-mdadm-devel@lists.alioth.debian.org>
> Architecture: amd64
> Version: 2.6.7.2-3
> Replaces: mdctl
> Depends: libc6 (>= 2.7-1), udev | makedev, debconf (>= 1.4.72), lsb-base (>=
> 3.1-6)
> Recommends: exim4 | mail-transport-agent, module-init-tools
> Conflicts: initramfs-tools (<< 0.65), mdctl (<< 0.7.2), raidtools2 (<<
> 1.00.3-12.1)
> Filename: pool/main/m/mdadm/mdadm_2.6.7.2-3_amd64.deb
> Size: 273876
> MD5sum: a3755364dcc80be5d940a3d423eb55a9
> SHA1: a0ee5083f213f70bbb96cb8fd5b2f89a5cb8ddd3
> SHA256: 10add842a74034592b8647c8e70a69502e3d915413a7da640c0172d02ef9ee7d
> Description: tool to administer Linux MD arrays (software RAID)
>  The mdadm utility can be used to create, manage, and monitor MD
>  (multi-disk) arrays for software RAID or multipath I/O.
>  .
>  This package automatically configures mdadm to assemble arrays during the
>  system startup process. If not needed, this functionality can be disabled.
> Homepage: http://neil.brown.name/blog/mdadm
> Tag: admin::boot, admin::configuring, hardware::storage, implemented-in::c,
> implemented-in::shell, interface::commandline, interface::daemon,
> role::program, scope::utility, use::configuring, use::monitor
>
>
>        "Lenny" i386 lists the same thing.
>
>> (Yes, BTW, they should probably have a bug filed to get mdadm 3.1
>> included before the freeze...)
>>
>> Package: mdadm
>> Priority: optional
>> Section: admin
>> Installed-Size: 1064
>> Maintainer: Debian mdadm maintainers <pkg-mdadm-
>> devel@lists.alioth.debian.org>
>> Architecture: i386
>> Version: 3.0.3-2
>> Replaces: mdctl
>> Depends: libc6 (>= 2.3.3), udev | makedev, debconf (>= 1.4.72),
>> lsb-base (>= 3.1-6)
>> Recommends: default-mta | mail-transport-agent, module-init-tools
>> Conflicts: initramfs-tools (<< 0.65), mdctl (<< 0.7.2), raidtools2 (<<
>> 1.00.3-12.1)
>> Filename: pool/main/m/mdadm/mdadm_3.0.3-2_i386.deb
>> Size: 418426
>> MD5sum: ab27fb8bfde438bc76dcb42ce8717626
>> SHA1: a89f1b90ac08bcf29c6c49cc310db0823edf8562
>> SHA256: 5f9fae56cba6aa6dbb747ddf86402615319d32f3d692da64a818f0f1fab399af
>> Description: tool to administer Linux MD arrays (software RAID)
>>  The mdadm utility can be used to create, manage, and monitor MD
>>  (multi-disk) arrays for software RAID or multipath I/O.
>>  .
>>  This package automatically configures mdadm to assemble arrays during the
>>  system startup process. If not needed, this functionality can be
>> disabled.
>> Homepage: http://neil.brown.name/blog/mdadm
>> Tag: admin::boot, admin::configuring, hardware::storage,
>> implemented-in::c, implemented-in::shell, interface::commandline,
>> interface::daemon, role::program, scope::utility, use::configuring,
>> use::monitor
>>
>>
>> Package: linux-image-2.6.32-trunk-686
>> Priority: optional
>> Section: kernel
>> Installed-Size: 74220
>> Maintainer: Debian Kernel Team <debian-kernel@lists.debian.org>
>> Architecture: i386
>> Source: linux-2.6
>> Version: 2.6.32-5
>> Provides: linux-image, linux-image-2.6, linux-modules-2.6.32-trunk-686
>> Depends: module-init-tools, initramfs-tools (>= 0.55) | linux-initramfs-
>> tool
>> Pre-Depends: debconf | debconf-2.0
>> Recommends: firmware-linux-free (>= 2.6.32), libc6-i686
>> Suggests: linux-doc-2.6.32, grub | lilo
>> Conflicts: initramfs-tools (<< 0.55)
>> Filename: pool/main/l/linux-2.6/linux-image-2.6.32-trunk-686_2.6.32-
>> 5_i386.deb
>> Size: 26282748
>> MD5sum: 776c9e57322b9e154bcc0518a9224df3
>> SHA1: 210cc48a91120ebd36cb20d9516e6e34e4c52da4
>> SHA256: bf8e8936cacf902b09dde1950bf10dcf50b1cceeeb4d1c351250a5c13da42e83
>> Description: Linux 2.6.32 for modern PCs
>>  The Linux kernel 2.6.32 and modules for use on PCs with Intel Pentium
>>  Pro/II/III/4/4M/D/M, Xeon, Celeron, Core or Atom; AMD K6, Geode LX/NX,
>>  Athlon (K7), Duron, Opteron, Sempron, Turion or Phenom; Transmeta
>>  Efficeon; VIA C3 "Nehemiah" or C7 processors.
>> --
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>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>
>

Yes, it is for Squeeze, if you want the latest bugfixes and security
updates you should seriously consider running debian-testing instead
of stable.  Stable is reserved for 'mature' features.  Testing, as far
as I'm aware, will almost never (and should never if you are paying
attention) cause data-loss, but might occasionally get in to a
situation where something breaks; mostly just during upgrades (but
then that's true of any upgrade).
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Re: RAID5 - RAID6

[Michael Evans]

On Sun, Mar 7, 2010 at 7:27 PM, Leslie Rhorer <lrhorer@satx.rr.com> wrote:
>
>> > >> You need mdadm-3.1.1 plus linux 2.6.32.
>> > >>
>> > >> NeilBrown
>> > >>
>> > >> >
>> > >> > --
>> > >> > To unsubscribe from this list: send the line "unsubscribe linux-
>> raid"
>> > in
>> > >> > the body of a message to majordomo@vger.kernel.org
>> > >> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
>> > >
>> > >
>> > > --
>> > > To unsubscribe from this list: send the line "unsubscribe linux-raid"
>> in
>> > > the body of a message to majordomo@vger.kernel.org
>> > > More majordomo info at  http://vger.kernel.org/majordomo-info.html
>> > >
>> >
>> > What are you talking about?
>>
>>       Referring to what, specifically?
>>
>> > Have you not synced to the online
>> > repository?  I grabbed this out of the Package.bz2 file.
>>
>>       Of course.  I'm running "Lenny" for an AMD-64.  The output below is
>> definitely not for AMD-64, and it looks to me like it might be "Squeeze"
>> or
>> "Sid", not "Lenny".
>>
>> >From the "Lenny" AMD-64 Package.bz2 file:
>
>        Digging a bit further, even "Squeeze" does not offer mdadm 3.1.1, at
> least not in the AMD-64 distro.  It's included version at the moment is
> 3.0.3-2.
>
>

Yes, but it's kernel is supported.  You need only run the newer
version during the reshape phase.  Otherwise normal operations should
still be supported.  The requirements to compile mdadm aren't exactly
a full development system.  You don't even have to install it to run
it; you can do that in the build area.
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RE: RAID5 - RAID6

[Leslie Rhorer]

> Yes, it is for Squeeze, if you want the latest bugfixes and security
> updates you should seriously consider running debian-testing instead
> of stable.

	No, thanks.  I loaded "Squeeze" on another non-RAID workstation in
order to alleviate a kernel bug causing problems with a 3G wireless modem.
It was quite unstable, and caused a number of issues, most problematically
with the fact the distro assumes the system is not headless and would lock
up tight on boot if no monitor is present.  All of the RAID systems are
headless.  More importantly, stability is far and away the absolutely most
important requirement for these servers.  New features I can live without.
Bug fixes I don't need unless they directly affect the functioning of the
system, which is highly focussed.  These systems have a handful of very
basic, very mature apps.  They run NTP, FTP, SSH, rsync, NUT, SMART, SAMBA,
NFS, and KDE.  One of them also runs Galleon, pyTivo, TyTool under wine, and
openvpn server.  That's it.

> Stable is reserved for 'mature' features.  Testing, as far
> as I'm aware, will almost never (and should never if you are paying
> attention) cause data-loss, but might occasionally get in to a
> situation where something breaks; mostly just during upgrades (but
> then that's true of any upgrade).

	It's true no data was lost, but then it's a little difficult to lose
data if the system hangs hard on boot.  I had to yank most of the guts out
of the system to get it stable.  That, plus the new version of KDE really
sucks badly, and I could not get Kpackage to work properly at all.  It also
did something really goofy to pppd, but I was able to work around it by
re-trying the pppd launch repeatedly on boot until it works.

Re: RAID5 - RAID6

[Michael Evans]

On Mon, Mar 8, 2010 at 12:59 AM, Leslie Rhorer <lrhorer@satx.rr.com> wrote:
>> Yes, it is for Squeeze, if you want the latest bugfixes and security
>> updates you should seriously consider running debian-testing instead
>> of stable.
>
>        No, thanks.  I loaded "Squeeze" on another non-RAID workstation in
> order to alleviate a kernel bug causing problems with a 3G wireless modem.
> It was quite unstable, and caused a number of issues, most problematically
> with the fact the distro assumes the system is not headless and would lock
> up tight on boot if no monitor is present.  All of the RAID systems are
> headless.  More importantly, stability is far and away the absolutely most
> important requirement for these servers.  New features I can live without.
> Bug fixes I don't need unless they directly affect the functioning of the
> system, which is highly focussed.  These systems have a handful of very
> basic, very mature apps.  They run NTP, FTP, SSH, rsync, NUT, SMART, SAMBA,
> NFS, and KDE.  One of them also runs Galleon, pyTivo, TyTool under wine, and
> openvpn server.  That's it.
>
>> Stable is reserved for 'mature' features.  Testing, as far
>> as I'm aware, will almost never (and should never if you are paying
>> attention) cause data-loss, but might occasionally get in to a
>> situation where something breaks; mostly just during upgrades (but
>> then that's true of any upgrade).
>
>        It's true no data was lost, but then it's a little difficult to lose
> data if the system hangs hard on boot.  I had to yank most of the guts out
> of the system to get it stable.  That, plus the new version of KDE really
> sucks badly, and I could not get Kpackage to work properly at all.  It also
> did something really goofy to pppd, but I was able to work around it by
> re-trying the pppd launch repeatedly on boot until it works.
>
>

Oh, is THAT where Ubuntu got 10.04's silly framebuffer required to
boot issue from...
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