[linux-lvm] software raid or lvm?

[linux-lvm] software raid or lvm?

[philip]

hello all,

i've got mobo with nforce2 and siimage3112 chipset and two sata hd. i'd like to 
install suse91, which doesn't support siimage chipset, so i've to use software 
raid or lvm.
what would be better/faster?
can i check speed of lvm like hd speed with hdparm?
thank for tip
philip

Re: [linux-lvm] software raid or lvm?

[Theo Van Dinter]

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On Mon, Jun 07, 2004 at 05:25:57PM +0200, philip wrote:
> like to install suse91, which doesn't support siimage chipset, so i've to 
> use software raid or lvm.
> what would be better/faster?

Well, what are you trying to do?  If you want redundancy, go with RAID.
If you want volume management, go with LVM.  I'd say you should do both
(RAID the disks then use LVM on top), but without more data there is no
answer for "better/faster".

-- 
Randomly Generated Tagline:
Why is there a file in the /usr/include/unused directory?

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Re: [linux-lvm] software raid or lvm?

[Karen Shaeffer]

On Mon, Jun 07, 2004 at 05:25:57PM +0200, philip wrote:
> hello all,
> 
> i've got mobo with nforce2 and siimage3112 chipset and two sata hd. i'd 

You can find Sil311x support in the 2.6.6 kernel. I've run it with the
Sil3114 controller.

Karen
-- 
 Karen Shaeffer
 Neuralscape, Palo Alto, Ca. 94306
 shaeffer@neuralscape.com  http://www.neuralscape.com

Re: [linux-lvm] software raid or lvm?

[philip]

hi,
i'm sorry that i wasn't more clear. i used to have raid0 with the siimage binary 
driver, but that is only for 2.4 kernels. so i've to use software raid and i 
didn't find the way how to put lvm on top of software raid. or how can i do it?
however, in suse admin guide is written about lvm: 'several hard disks can be 
used with improved performance in the raid0 (striping) mode.' any idea? can i 
use lvm as raid0? course, the best is raid and lvm on top, but if i can use only 
lvm, how fast it would be? can i check the speed?
thank you
philip

Theo Van Dinter wrote:
> On Mon, Jun 07, 2004 at 05:25:57PM +0200, philip wrote:
> 
>>like to install suse91, which doesn't support siimage chipset, so i've to 
>>use software raid or lvm.
>>what would be better/faster?
> 
> 
> Well, what are you trying to do?  If you want redundancy, go with RAID.
> If you want volume management, go with LVM.  I'd say you should do both
> (RAID the disks then use LVM on top), but without more data there is no
> answer for "better/faster".
> 
> 
> 
> ------------------------------------------------------------------------
> 
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@redhat.com
> https://www.redhat.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/

Re: [linux-lvm] software raid or lvm?

[philip]

hi,
i'm sorry that i wasn't more clear. i used to have raid0 with the siimage binary 
driver, but that is only for 2.4 kernels. so i've to use software raid and i 
didn't find the way how to put lvm on top of software raid. or how can i do it?
however, in suse admin guide is written about lvm: 'several hard disks can be 
used with improved performance in the raid0 (striping) mode.' any idea? can i 
use lvm as raid0? course, the best is raid and lvm on top, but if i can use only 
lvm, how fast it would be? can i check the speed?
thank you
philip


Theo Van Dinter wrote:
> On Mon, Jun 07, 2004 at 05:25:57PM +0200, philip wrote:
> 
>>like to install suse91, which doesn't support siimage chipset, so i've to 
>>use software raid or lvm.
>>what would be better/faster?
> 
> 
> Well, what are you trying to do?  If you want redundancy, go with RAID.
> If you want volume management, go with LVM.  I'd say you should do both
> (RAID the disks then use LVM on top), but without more data there is no
> answer for "better/faster".

Re: [linux-lvm] software raid or lvm?

[philip]

hello,

Karen Shaeffer wrote:
> You can find Sil311x support in the 2.6.6 kernel. I've run it with the
> Sil3114 controller.

so far i know (i didn't watch that for few last months) there is driver for 
sil3112 in 2.6 kernel (sata_sil) but the raid driver didn't work. also it didn't 
work well for everyone. so any good news?
thank you
philip

Re: [linux-lvm] software raid or lvm?

[philip]

hello,

Karen Shaeffer wrote:
> You can find Sil311x support in the 2.6.6 kernel. I've run it with the
> Sil3114 controller.

so far i know (i didn't watch that for few last months) there is driver for 
sil3112 in 2.6 kernel (sata_sil) but the raid driver didn't work. also it didn't 
work well for everyone. so any good news?
thank you
philip

Re: [linux-lvm] software raid or lvm?

[David Greaves]

philip wrote:

> hello,
>
> Karen Shaeffer wrote:
>
>> You can find Sil311x support in the 2.6.6 kernel. I've run it with the
>> Sil3114 controller.
>
>
> so far i know (i didn't watch that for few last months) there is 
> driver for sil3112 in 2.6 kernel (sata_sil) but the raid driver didn't 
> work. also it didn't work well for everyone. so any good news?
> thank you
> philip


Jeff Garzik said on the 10th May in the linux-ide list:

Serial ATA (SATA) for Linux
status report
May 10, 2004


Silicon Image 3112/3114
-----------------------
Summary: No TCQ. Looks like a PATA controller, but with full SATA
control including hotplug and PM.

libata driver status: Beta.

drivers/ide driver status: Production, but see issue #4.

Issue #4: Need to have the most recent fixes posted to lkml, for stable
operation and full performance (where possible).




HTH

David

Re: [linux-lvm] software raid or lvm?

[Urs Thuermann]

philip <mail@blocked.name> writes:

> so i've to use software raid and i didn't find the way how to put
> lvm on top of software raid. or how can i do it?

You can do software RAID on your drives, which gives you a device like
/dev/md0.  To put LVM on top of software RAID you create a phyiscal
volume in /dev/md0 (or several PVs in /dev/md<n>), create a volume
group from these PVs, etc.

> however, in suse admin guide is written about lvm: 'several hard disks
> can be used with improved performance in the raid0 (striping) mode.'
> any idea? can i use lvm as raid0?

You can do software RAID0 and LVM on top of it as described above.
However, LVM can also do striping over PVs of one VG, so for striping
you don't need software RAID, but can do LVM directly on your drives.


urs