Which RAID Levels supported by LVM

[Abubakkar]

Which RAID Levels supported by LVM v1&v2

[Torsten.]

RAID0, RAID1 and RAID0+1 (mirrors and striped volumes and striped mirrors with 11.31 only).

[P Arumugavel · Accepted solution]

hi Abu,

Releases prior to HP-UX 11i v3 only support striped (RAID0) or mirrored (RAID1) logical volumes and do not support combination of striped and mirrored (RAID10) logical volumes. If a logical volume using simultaneous mirroring and striping is created on HP-UX 11i v3, attempts to import or activate its associated volume group fails on a previous HP-UX release.

To import the volume group with striped and mirrored logical volume to releases prior to HP-UX 11i v3, you must remove the incompatible logical volumes or reduce them to no mirrors.

Striped and mirrored logical volume is supported on HP-UX 11i v2 with the PHCO_36744, PHKL_36745 and PHCO_36746 patches. With these patches or superseding patches installed on a HP-UX 11i v2 system, you can successfully import and activate a volume group with striped and mirrored logical volume created on HP-UX 11i v3.

[Emil Velez]

See enclosed white paper

LVM v2 does not support disk sparing with regards to mirroring. That was where you had a disk as a designated spare for LVM volumes where a mirrored volume was on a disk that failed. The spare volume would then be synced with the volumes that were not mirrored.

[Terry.giblin]

Happy New Year Everyone!

RAID0, RAID1, RAID(0+1), I understand.

Does anyone have a simple table or diagram of the various RAID levels vs various OS version's, ....?

So there is no more confusion?

Terry Giblin

[Manix]

HP-UX with LVM supports

1 ) Mirroring RAID 1

2 ) Striping RAID 0

3 ) Striping + Mirroring ( 0 + 1 )with PVGS that is
with PVG strict & distributed striping
LVM polict ( -S g -D y)

Please have a simple diagram to clarify the architecture .

RAID 5 & RAID Mirroring + striping are supported on VXVM only !!

[Torsten.]

>> RAID Mirroring + striping are supported on VXVM only !!


No, see my post above.

[Ismail Azad]

Hi,

> Torsten,

> RAID Mirroring + striping are supported on VXVM only !!
No, see my post above.

I think manix is referring to raid 1+0 and not raid 0+1. Both posts are right. :).

To add more clarity striped logical volumes that can be mirrored is supported in LVM disk partitioning approach (0+1) as part of LVM enhancements in 11iv3 (adding to torsten) and RAID 5 definitely not supported with LVM.

LVM v2 supports creation of upto 6 mirror copies as opposed to 3 on LVM v1.

Regards
Ismail Azad