[linux-lvm] Problem with lvm2 and softwareraid
Zac Slade
krakrjak at volumehost.com
Fri Oct 28 17:34:55 UTC 2005
Quoting Johannes Ullmann <j.ullmann at evva.com>:
> Hello!
>
> I'm building a backup to disk system and i have strange problem with lvm
> on top of 2 software raid 5 devices.
> Each SW Raid-5 has 7x400GB HDDs (=2,4TB). On top of these two SW Raid
> devices I created one big LV with 4,8TB.
> I use Reiserfs as filesystem. I worked fine while the disk usage was
> below 1,5TB, above that, the Filesystem was destroyed. I tried the same
> with ext3 and had the same results. So I't not the Filesystem. I also
> checked the Softwareraid and the LV for any Problems but i haven't found
> anything.
> After reading many Mails/howtos/man-pages I quess that LVM can't handle
> PV's which are larger than 2TB is this correct?
> I haven't found anything in the documentation about the maximum PV size.
Yes and No. There was a max pv size. If you use metadata format for version 1
it has a hard limit of 2 TiB for a pv size. Using metadata format version 2 it
is an unsigned long int so the max pv size is 4 exabytes in length. If you feel
that the pv size is holding you back you can force metadata version 2 when you
execute pvcreate (e.g. pvcreate -M1 for metadata version 1 or pvcreate -M2 for
metadata version 2).
> thanks for any help.
I hope that helps. I can't imagine it actually being in reiser so I'd try
recreating the pvs.
Zac Slade
krakrjak at volumehost.com
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