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| Date: | Mon, 5 Feb 2007 12:44:57 -0500 |
| Content-Type: | text/plain |
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Hi Jan,
On Feb 5, 2007, at 12:36 PM, Jan Iven wrote:
> On 05/02/07 16:39, Devin Bougie wrote:
> ..
>
>> The 3ware controller splits this 6.82TB RAID volume into
>> 2TB volumes (sd[c-f]) that we combine into one volume group.
> ..
>
>> Please let me know if there's any other information we can
>> provide. Any
>> suggestions or help would be greatly appreciate.
>
> What is the physical extent size of your volume group?
32M (I think everything I didn't list is the default).
> the default 32M
> would limit you to ~2TB (~64k extents per volume group, see vgcreate
> (1)).
>
> I believe the 2.4 kernels have a 2TB limit per block device.
> http://www.redhat.com/rhel/details/limits/#five
> agrees with this.
Correct; which is why the 3ware controller splits the RAID array into
2TB volumes. The operating system sees 3ware array as three 2TB and
one 800GB block devices.
[root@lnx113 root]# vgdisplay vg1
--- Volume group ---
VG Name vg1
VG Access read/write
VG Status available/resizable
VG # 1
MAX LV 256
Cur LV 2
Open LV 2
MAX LV Size 2 TB
Max PV 256
Cur PV 4
Act PV 4
VG Size 6.82 TB
PE Size 32 MB
Total PE 223510
Alloc PE / Size 124800 / 3.81 TB
Free PE / Size 98710 / 3.01 TB
VG UUID Mcy66r-Dtge-05od-TAvJ-724U-0HZ1-DK4qgG
[root@lnx113 root]# pvscan
pvscan -- reading all physical volumes (this may take a while...)
pvscan -- WARNING: physical volume "/dev/sda4" belongs to a meta device
pvscan -- WARNING: physical volume "/dev/sdb4" belongs to a meta device
pvscan -- ACTIVE PV "/dev/sdc" of VG "vg1" [2 TB / 0 free]
pvscan -- ACTIVE PV "/dev/sdd" of VG "vg1" [2 TB / 195.94 GB free]
pvscan -- ACTIVE PV "/dev/sde" of VG "vg1" [2 TB / 2 TB free]
pvscan -- ACTIVE PV "/dev/sdf" of VG "vg1" [840.78 GB / 840.78 GB
free]
pvscan -- ACTIVE PV "/dev/md2" of VG "vg" [68.72 GB / 49.17 GB free]
pvscan -- total: 7 [6.89 TB] / in use: 7 [6.89 TB] / in no VG: 0 [0]
Devin
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