dm-raid45?

dm-raid45?

[David F.]

As a workaround to the mdadm issue with the spare drive we were going
to have them activate DMRAID but that ends up with the information
below.  Specifically something about dm-raid45 but we had to drop that
because it no longer compiles in the latest kernels and we couldn't
find an update that would.   Any ideas?  (still working on getting the
dump - the fact that tmpfs doesn't support sparse files makes having
the customer create the dump via a script we provide a bit more
involved):

ERROR: device-mapper target type "raid45" is not in the kernel
WARN: locking /var/lock/dmraid/.lock
NOTICE: skipping removable device /dev/sda
NOTICE: /dev/sdg: asr     discovering
NOTICE: /dev/sdg: ddf1    discovering
NOTICE: /dev/sdg: ddf1 metadata discovered
NOTICE: /dev/sdg: hpt37x  discovering
NOTICE: /dev/sdg: hpt45x  discovering
NOTICE: /dev/sdg: isw     discovering
NOTICE: /dev/sdg: jmicron discovering
NOTICE: /dev/sdg: lsi     discovering
NOTICE: /dev/sdg: nvidia  discovering
NOTICE: /dev/sdg: pdc     discovering
NOTICE: /dev/sdg: sil     discovering
NOTICE: /dev/sdg: via     discovering
NOTICE: /dev/sdf: asr     discovering
NOTICE: /dev/sdf: ddf1    discovering
NOTICE: /dev/sdf: ddf1 metadata discovered
NOTICE: /dev/sdf: hpt37x  discovering
NOTICE: /dev/sdf: hpt45x  discovering
NOTICE: /dev/sdf: isw     discovering
NOTICE: /dev/sdf: jmicron discovering
NOTICE: /dev/sdf: lsi     discovering
NOTICE: /dev/sdf: nvidia  discovering
NOTICE: /dev/sdf: pdc     discovering
NOTICE: /dev/sdf: sil     discovering
NOTICE: /dev/sdf: via     discovering
NOTICE: /dev/sde: asr     discovering
NOTICE: /dev/sde: ddf1    discovering
NOTICE: /dev/sde: ddf1 metadata discovered
NOTICE: /dev/sde: hpt37x  discovering
NOTICE: /dev/sde: hpt45x  discovering
NOTICE: /dev/sde: isw     discovering
NOTICE: /dev/sde: jmicron discovering
NOTICE: /dev/sde: lsi     discovering
NOTICE: /dev/sde: nvidia  discovering
NOTICE: /dev/sde: pdc     discovering
NOTICE: /dev/sde: sil     discovering
NOTICE: /dev/sde: via     discovering
NOTICE: /dev/sdd: asr     discovering
NOTICE: /dev/sdd: ddf1    discovering
NOTICE: /dev/sdd: ddf1 metadata discovered
NOTICE: /dev/sdd: hpt37x  discovering
NOTICE: /dev/sdd: hpt45x  discovering
NOTICE: /dev/sdd: isw     discovering
NOTICE: /dev/sdd: jmicron discovering
NOTICE: /dev/sdd: lsi     discovering
NOTICE: /dev/sdd: nvidia  discovering
NOTICE: /dev/sdd: pdc     discovering
NOTICE: /dev/sdd: sil     discovering
NOTICE: /dev/sdd: via     discovering
NOTICE: /dev/sdc: asr     discovering
NOTICE: /dev/sdc: ddf1    discovering
NOTICE: /dev/sdc: ddf1 metadata discovered
NOTICE: /dev/sdc: hpt37x  discovering
NOTICE: /dev/sdc: hpt45x  discovering
NOTICE: /dev/sdc: isw     discovering
NOTICE: /dev/sdc: jmicron discovering
NOTICE: /dev/sdc: lsi     discovering
NOTICE: /dev/sdc: nvidia  discovering
NOTICE: /dev/sdc: pdc     discovering
NOTICE: /dev/sdc: sil     discovering
NOTICE: /dev/sdc: via     discovering
NOTICE: /dev/sdb: asr     discovering
NOTICE: /dev/sdb: ddf1    discovering
NOTICE: /dev/sdb: hpt37x  discovering
NOTICE: /dev/sdb: hpt45x  discovering
NOTICE: /dev/sdb: isw     discovering
NOTICE: /dev/sdb: jmicron discovering
NOTICE: /dev/sdb: lsi     discovering
NOTICE: /dev/sdb: nvidia  discovering
NOTICE: /dev/sdb: pdc     discovering
NOTICE: /dev/sdb: sil     discovering
NOTICE: /dev/sdb: via     discovering
NOTICE: added /dev/sdg to RAID set ".ddf1_disks"
NOTICE: added /dev/sdf to RAID set ".ddf1_disks"
NOTICE: added /dev/sde to RAID set ".ddf1_disks"
NOTICE: added /dev/sdd to RAID set ".ddf1_disks"
NOTICE: added /dev/sdc to RAID set ".ddf1_disks"
RAID set "ddf1_MegaSR   R5 #0" was not activated
INFO: Activating GROUP raid set ".ddf1_disks"
WARN: unlocking /var/lock/dmraid/.lock

Output of dmraid --raid_devices command:
/dev/sdg: ddf1, ".ddf1_disks", GROUP, unknown, 285155328 sectors, data@ 0
/dev/sdf: ddf1, ".ddf1_disks", GROUP, ok, 285155328 sectors, data@ 0
/dev/sde: ddf1, ".ddf1_disks", GROUP, ok, 285155328 sectors, data@ 0
/dev/sdd: ddf1, ".ddf1_disks", GROUP, ok, 285155328 sectors, data@ 0
/dev/sdc: ddf1, ".ddf1_disks", GROUP, ok, 285155328 sectors, data@ 0

Output of dmraid -s -s command:
*** Group superset .ddf1_disks
--> Subset
name   : ddf1_MegaSR   R5 #0
size   : 855465984
stride : 128
type   : raid5_ls
status : ok
subsets: 0
devs   : 4
spares : 0

Re: dm-raid45?

[Dmitrijs Ledkovs]

On 26 November 2013 18:07, David F. <df7729@gmail.com> wrote:
> As a workaround to the mdadm issue with the spare drive we were going
> to have them activate DMRAID but that ends up with the information
> below.  Specifically something about dm-raid45 but we had to drop that
> because it no longer compiles in the latest kernels and we couldn't
> find an update that would.   Any ideas?  (still working on getting the
> dump - the fact that tmpfs doesn't support sparse files makes having
> the customer create the dump via a script we provide a bit more
> involved):
>

Ubuntu kernels still somewhat maintain and have dm-raid-45 module.

Install linux-image-extra-virtual package which will pull in correct
versioned packaged with extra modules.

It is planned however to migrate off & drop dm-raid-45 module soon.

ps. latest version I can find is
3.8.0-22-generic/kernel/ubuntu/dm-raid4-5/dm-raid45.ko

Regards,

Dmitrijs.

Re: dm-raid45?

[Tom Pfeifer]

On 11/26/2013 06:32 PM, Dmitrijs Ledkovs wrote:
> On 26 November 2013 18:07, David F. <df7729@gmail.com> wrote:
>> As a workaround to the mdadm issue with the spare drive we were going
>> to have them activate DMRAID but that ends up with the information
>> below.  Specifically something about dm-raid45 but we had to drop that
>> because it no longer compiles in the latest kernels and we couldn't
>> find an update that would.   Any ideas?  (still working on getting the
>> dump - the fact that tmpfs doesn't support sparse files makes having
>> the customer create the dump via a script we provide a bit more
>> involved):
>>
> 
> Ubuntu kernels still somewhat maintain and have dm-raid-45 module.
> 
> Install linux-image-extra-virtual package which will pull in correct
> versioned packaged with extra modules.
> 
> It is planned however to migrate off & drop dm-raid-45 module soon.
> 
> ps. latest version I can find is
> 3.8.0-22-generic/kernel/ubuntu/dm-raid4-5/dm-raid45.ko
> 
> Regards,
> 
> Dmitrijs.

As a follow up to this general subject, what will replace the dm-raid45
module after it is dropped?

I guess another way to ask that question is what functionality does the
dm-raid45 module support that is not currently supported by the dm-raid
module, which has aliases to dm-raid1, dm-raid4, dm-raid5, dmraid6, and
dm-raid10.

And is it already possible now (in recent kernels such as 3.11.x and
later) to use the dm-raid module in place of dm-raid45?

Re: dm-raid45?

[Dmitrijs Ledkovs]

On 3 December 2013 14:42, Tom Pfeifer <tpfeife1@gmail.com> wrote:
> On 11/26/2013 06:32 PM, Dmitrijs Ledkovs wrote:
>> On 26 November 2013 18:07, David F. <df7729@gmail.com> wrote:
>>> As a workaround to the mdadm issue with the spare drive we were going
>>> to have them activate DMRAID but that ends up with the information
>>> below.  Specifically something about dm-raid45 but we had to drop that
>>> because it no longer compiles in the latest kernels and we couldn't
>>> find an update that would.   Any ideas?  (still working on getting the
>>> dump - the fact that tmpfs doesn't support sparse files makes having
>>> the customer create the dump via a script we provide a bit more
>>> involved):
>>>
>>
>> Ubuntu kernels still somewhat maintain and have dm-raid-45 module.
>>
>> Install linux-image-extra-virtual package which will pull in correct
>> versioned packaged with extra modules.
>>
>> It is planned however to migrate off & drop dm-raid-45 module soon.
>>
>> ps. latest version I can find is
>> 3.8.0-22-generic/kernel/ubuntu/dm-raid4-5/dm-raid45.ko
>>
>> Regards,
>>
>> Dmitrijs.
>
> As a follow up to this general subject, what will replace the dm-raid45
> module after it is dropped?
>
> I guess another way to ask that question is what functionality does the
> dm-raid45 module support that is not currently supported by the dm-raid
> module, which has aliases to dm-raid1, dm-raid4, dm-raid5, dmraid6, and
> dm-raid10.
>
> And is it already possible now (in recent kernels such as 3.11.x and
> later) to use the dm-raid module in place of dm-raid45?
>

The current plan is as following:
* for ddf & intel matrix raid formats => migrate from dmraid to mdadm
(external metadata) (which supports raid levels 4 & 5 for those
formats and more)
* investigate whether dmraid can be modified to use stock dm-raid
modules, instead of the dmraid45 module

The first point should cover all but nvidia/dmraid, the second one
should resolve the situation completely.

Above plan was discussed at the public virtual Ubuntu Developer Summit
(video at):
http://summit.ubuntu.com/uds-1311/meeting/22028/core-1311-dmraid2mdadm/

The workitems to complete above are tracked on a blueprint at launchpad:
https://blueprints.launchpad.net/ubuntu/+spec/core-1311-dmraid2mdadm

You can subscribe to the blueprint, if you wish, to get email updates
on the progress of this work to get notified when it's ready/available
for testing.

Regards,

Dmitrijs.