* [linux-lvm] MD RAID DEVICES INFO @ 2000-02-24 14:08 Michael Loftis 2000-02-24 15:10 ` A James Lewis 0 siblings, 1 reply; 5+ messages in thread From: Michael Loftis @ 2000-02-24 14:08 UTC (permalink / raw) To: linux-lvm@msede.com MD has been unsupported since the 2.2 series of kernels (it wasn't marked as such because nobody realised this until the 2.2.13->2.2.14 patch. Since everyone has been asking about it I figured I'd let everyone know. If someone wants to pick it up drop by l-k and check and see if anyone ahs yet. -- Michael Loftis zop12@mindless.com ICQ: 15648280 AIM: DyJailBait Funny quip of the moment just happens to be.... Linux is like a tent: no gates, no windows, and an Apache inside! ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [linux-lvm] MD RAID DEVICES INFO 2000-02-24 14:08 [linux-lvm] MD RAID DEVICES INFO Michael Loftis @ 2000-02-24 15:10 ` A James Lewis 2000-02-24 17:20 ` Heinz Mauelshagen 0 siblings, 1 reply; 5+ messages in thread From: A James Lewis @ 2000-02-24 15:10 UTC (permalink / raw) To: Michael Loftis; +Cc: linux-lvm@msede.com, chrisp The MD functionality has only just matured, how is this to be moved forward into 2.4? Is the MD functionality being rolled into LVM? What about duplication of effort.... I take it that large portions of code can be shared? I am told that LVM supports only linear and RAID0 which is hardly useful... I appreciate that this is a work in progress but with 2.4 on the horizon can we really justify dropping a well tested and functional system for somthing without the major functionality of MD? Perhaps somone can let me know how they see this moving forward? On Thu, 24 Feb 2000, Michael Loftis wrote: > MD has been unsupported since the 2.2 series of kernels (it wasn't > marked as such because nobody realised this until the 2.2.13->2.2.14 > patch. > > Since everyone has been asking about it I figured I'd let everyone know. > > If someone wants to pick it up drop by l-k and check and see if anyone > ahs yet. > > -- > Michael Loftis > zop12@mindless.com ICQ: 15648280 AIM: DyJailBait > Funny quip of the moment just happens to be.... > Linux is like a tent: > no gates, no windows, and an Apache inside! > > ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [linux-lvm] MD RAID DEVICES INFO 2000-02-24 15:10 ` A James Lewis @ 2000-02-24 17:20 ` Heinz Mauelshagen 2000-02-24 17:33 ` A James Lewis 0 siblings, 1 reply; 5+ messages in thread From: Heinz Mauelshagen @ 2000-02-24 17:20 UTC (permalink / raw) To: A James Lewis; +Cc: mge, linux-lvm > > The MD functionality has only just matured, how is this to be moved > forward into 2.4? Today there's MD concat and RAID0 only in 2.3.x. > Is the MD functionality being rolled into LVM? No. I don't like to create moster ;-{) A modular approach is better by far (see below). > What > about duplication of effort.... I take it that large portions of code can > be shared? No. It's not a question of large portions of code. Basically supporting RAID0 in LVM is fairly simple and gives you the choice for performance on which lower layer software or hardware solution.. > > I am told that LVM supports only linear and RAID0 which is hardly > useful... This is a misleading statement. Actually it's a question of how to layer several functional parts on each other. LVM basically gives you the flexibility of online resizing everything. MD is the software solution which can be stacked below LVM to enable software RAID1/4/5. OTOH you are able to use dedicated hardware RAID subsystems instead which are easier to administer and LVM on top of them to get the flexibility to resize. IOW: MD is one solution to address disk subsystem redundancy, hardware RAID subsystems is another. Volume Management sits on top of one of these (or even on mixed configurations). It can sit on top of multiple non redundant disks as well. > I appreciate that this is a work in progress but with 2.4 on the > horizon can we really justify dropping a well tested and functional system > for somthing without the major functionality of MD? Nobody wants to drop MD AFAIK! Heinz > > Perhaps somone can let me know how they see this moving forward? > > On Thu, 24 Feb 2000, Michael Loftis wrote: > > > MD has been unsupported since the 2.2 series of kernels (it wasn't > > marked as such because nobody realised this until the 2.2.13->2.2.14 > > patch. > > > > Since everyone has been asking about it I figured I'd let everyone know. > > > > If someone wants to pick it up drop by l-k and check and see if anyone > > ahs yet. > > > > -- > > Michael Loftis > > zop12@mindless.com ICQ: 15648280 AIM: DyJailBait > > Funny quip of the moment just happens to be.... > > Linux is like a tent: > > no gates, no windows, and an Apache inside! > > > > > -- =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Systemmanagement CS-TS T-Nova Entwicklungszentrum Darmstadt Heinz Mauelshagen Otto-Roehm-Strasse 71c Senior Systems Engineer Postfach 10 05 41 64205 Darmstadt mge@EZ-Darmstadt.Telekom.de Germany +49 6151 886-425 FAX-386 =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [linux-lvm] MD RAID DEVICES INFO 2000-02-24 17:20 ` Heinz Mauelshagen @ 2000-02-24 17:33 ` A James Lewis 2000-02-25 11:37 ` Andi Kleen 0 siblings, 1 reply; 5+ messages in thread From: A James Lewis @ 2000-02-24 17:33 UTC (permalink / raw) To: Heinz Mauelshagen; +Cc: mge, linux-lvm Ah, It becomes clear, I was worried that there was major duplication of effort going on and that LVM was implimenting the MD functionality.... It seems logical that MD provide the underlying redundnancya nd LVM provide volume management... Do I assume that MD will be available in 2.3/2.4 eventually..... it sounded from the original post that it was going to die.... On Thu, 24 Feb 2000, Heinz Mauelshagen wrote: > > > > The MD functionality has only just matured, how is this to be moved > > forward into 2.4? > > Today there's MD concat and RAID0 only in 2.3.x. > > > Is the MD functionality being rolled into LVM? > > No. > > I don't like to create moster ;-{) > A modular approach is better by far (see below). > > > What > > about duplication of effort.... I take it that large portions of code can > > be shared? > > No. It's not a question of large portions of code. > Basically supporting RAID0 in LVM is fairly simple and gives > you the choice for performance on which lower layer software > or hardware solution.. > > > > > I am told that LVM supports only linear and RAID0 which is hardly > > useful... > > This is a misleading statement. > > Actually it's a question of how to layer several functional parts > on each other. > LVM basically gives you the flexibility of online resizing everything. > > MD is the software solution which can be stacked below LVM to enable > software RAID1/4/5. > > OTOH you are able to use dedicated hardware RAID subsystems instead > which are easier to administer and LVM on top of them to get the flexibility > to resize. > > IOW: MD is one solution to address disk subsystem redundancy, > hardware RAID subsystems is another. > Volume Management sits on top of one of these > (or even on mixed configurations). > It can sit on top of multiple non redundant disks as well. > > > I appreciate that this is a work in progress but with 2.4 on the > > horizon can we really justify dropping a well tested and functional system > > for somthing without the major functionality of MD? > > Nobody wants to drop MD AFAIK! > > Heinz > > > > > Perhaps somone can let me know how they see this moving forward? > > > > On Thu, 24 Feb 2000, Michael Loftis wrote: > > > > > MD has been unsupported since the 2.2 series of kernels (it wasn't > > > marked as such because nobody realised this until the 2.2.13->2.2.14 > > > patch. > > > > > > Since everyone has been asking about it I figured I'd let everyone know. > > > > > > If someone wants to pick it up drop by l-k and check and see if anyone > > > ahs yet. > > > > > > -- > > > Michael Loftis > > > zop12@mindless.com ICQ: 15648280 AIM: DyJailBait > > > Funny quip of the moment just happens to be.... > > > Linux is like a tent: > > > no gates, no windows, and an Apache inside! > > > > > > > > > > > -- > > =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- > > Systemmanagement CS-TS T-Nova > Entwicklungszentrum Darmstadt > Heinz Mauelshagen Otto-Roehm-Strasse 71c > Senior Systems Engineer Postfach 10 05 41 > 64205 Darmstadt > mge@EZ-Darmstadt.Telekom.de Germany > +49 6151 886-425 > FAX-386 > =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- > ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [linux-lvm] MD RAID DEVICES INFO 2000-02-24 17:33 ` A James Lewis @ 2000-02-25 11:37 ` Andi Kleen 0 siblings, 0 replies; 5+ messages in thread From: Andi Kleen @ 2000-02-25 11:37 UTC (permalink / raw) To: A James Lewis; +Cc: Heinz Mauelshagen, mge, linux-lvm On Thu, Feb 24, 2000 at 05:33:52PM +0000, A James Lewis wrote: > > Ah, > > It becomes clear, I was worried that there was major duplication of effort > going on and that LVM was implimenting the MD functionality.... > > It seems logical that MD provide the underlying redundnancya nd LVM > provide volume management... > > Do I assume that MD will be available in 2.3/2.4 eventually..... it > sounded from the original post that it was going to die.... The original poster was clearly misguided, there are no signs of MD dying in 2.3/2.4. Some functionality from MD 0.90 has not been merged yet (RAID5), because it requires some more infrastructure changes in 2.3.x, but that will hopefully be solved before 2.4. -Andi > > On Thu, 24 Feb 2000, Heinz Mauelshagen wrote: > > > > > > > The MD functionality has only just matured, how is this to be moved > > > forward into 2.4? > > > > Today there's MD concat and RAID0 only in 2.3.x. > > > > > Is the MD functionality being rolled into LVM? > > > > No. > > > > I don't like to create moster ;-{) > > A modular approach is better by far (see below). > > > > > What > > > about duplication of effort.... I take it that large portions of code can > > > be shared? > > > > No. It's not a question of large portions of code. > > Basically supporting RAID0 in LVM is fairly simple and gives > > you the choice for performance on which lower layer software > > or hardware solution.. > > > > > > > > I am told that LVM supports only linear and RAID0 which is hardly > > > useful... > > > > This is a misleading statement. > > > > Actually it's a question of how to layer several functional parts > > on each other. > > LVM basically gives you the flexibility of online resizing everything. > > > > MD is the software solution which can be stacked below LVM to enable > > software RAID1/4/5. > > > > OTOH you are able to use dedicated hardware RAID subsystems instead > > which are easier to administer and LVM on top of them to get the flexibility > > to resize. > > > > IOW: MD is one solution to address disk subsystem redundancy, > > hardware RAID subsystems is another. > > Volume Management sits on top of one of these > > (or even on mixed configurations). > > It can sit on top of multiple non redundant disks as well. > > > > > I appreciate that this is a work in progress but with 2.4 on the > > > horizon can we really justify dropping a well tested and functional system > > > for somthing without the major functionality of MD? > > > > Nobody wants to drop MD AFAIK! > > > > Heinz > > > > > > > > Perhaps somone can let me know how they see this moving forward? > > > > > > On Thu, 24 Feb 2000, Michael Loftis wrote: > > > > > > > MD has been unsupported since the 2.2 series of kernels (it wasn't > > > > marked as such because nobody realised this until the 2.2.13->2.2.14 > > > > patch. > > > > > > > > Since everyone has been asking about it I figured I'd let everyone know. > > > > > > > > If someone wants to pick it up drop by l-k and check and see if anyone > > > > ahs yet. > > > > > > > > -- > > > > Michael Loftis > > > > zop12@mindless.com ICQ: 15648280 AIM: DyJailBait > > > > Funny quip of the moment just happens to be.... > > > > Linux is like a tent: > > > > no gates, no windows, and an Apache inside! > > > > > > > > > > > > > > > > > -- > > > > =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- > > > > Systemmanagement CS-TS T-Nova > > Entwicklungszentrum Darmstadt > > Heinz Mauelshagen Otto-Roehm-Strasse 71c > > Senior Systems Engineer Postfach 10 05 41 > > 64205 Darmstadt > > mge@EZ-Darmstadt.Telekom.de Germany > > +49 6151 886-425 > > FAX-386 > > =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- > > > ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2000-02-25 11:37 UTC | newest] Thread overview: 5+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2000-02-24 14:08 [linux-lvm] MD RAID DEVICES INFO Michael Loftis 2000-02-24 15:10 ` A James Lewis 2000-02-24 17:20 ` Heinz Mauelshagen 2000-02-24 17:33 ` A James Lewis 2000-02-25 11:37 ` Andi Kleen
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