[linux-lvm] LVM limit on PE's/size?
Scott P
pichelma at berbee.com
Tue Nov 27 14:01:02 UTC 2001
Andreas,
Thanks so much for the insight!
Here is some ouput, it looks like we might be ok?
Please comment, if possible, thanks...
-Scott
[root at ptb3 pichelma]# /sbin/pvdisplay /dev/sdb1
--- Physical volume ---
PV Name /dev/sdb1
VG Name exp300_2
PV Size 440.71 GB / NOT usable 26.75 MB [LVM: 176 KB]
PV# 2
PV Status available
Allocatable yes (but full)
Cur LV 1
PE Size (KByte) 32768
Total PE 14102
Free PE 0
Allocated PE 14102
PV UUID 1gKwp2-dotn-0WJU-5FwZ-uScI-OyMH-SHVw5F
[root at ptb3 pichelma]# /sbin/pvdisplay /dev/sdc1
--- Physical volume ---
PV Name /dev/sdc1
VG Name exp300_2
PV Size 440.71 GB / NOT usable 26.75 MB [LVM: 176 KB]
PV# 1
PV Status available
Allocatable yes (but full)
Cur LV 1
PE Size (KByte) 32768
Total PE 14102
Free PE 0
Allocated PE 14102
PV UUID ciUWIf-i9OO-okne-Fs6R-fjU1-NPpr-Ml4p8L
[root at ptb3 pichelma]# /sbin/pvdata -P /dev/sdb1
--- Physical volume ---
PV Name /dev/sdb1
VG Name exp300_2
PV Size 440.71 GB / NOT usable 26.75 MB [LVM: 176 KB]
PV# 2
PV Status available
Allocatable yes (but full)
Cur LV 1
PE Size (KByte) 32768
Total PE 14102
Free PE 0
Allocated PE 14102
PV UUID 1gKwp2-dotn-0WJU-5FwZ-uScI-OyMH-SHVw5F
[root at ptb3 pichelma]# /sbin/pvdata -P /dev/sdc1
--- Physical volume ---
PV Name /dev/sdc1
VG Name exp300_2
PV Size 440.71 GB / NOT usable 26.75 MB [LVM: 176 KB]
PV# 1
PV Status available
Allocatable yes (but full)
Cur LV 1
PE Size (KByte) 32768
Total PE 14102
Free PE 0
Allocated PE 14102
PV UUID ciUWIf-i9OO-okne-Fs6R-fjU1-NPpr-Ml4p8L
Andreas Dilger wrote:
> On Nov 27, 2001 11:34 -0600, Scott P wrote:
> > We are planning to add a 3 rd EXP300 array to out current server w/ 2
> > EXP300's in place already! We WILL surpass the 1 TB size, if possible?
>
> Depends if the driver does 32-bit block numbers with signed or unsigned
> values. The absolute maximum supported by 2.4 kernels is 2TB devices.
> I don't know if 2.2 will support > 1TB devices, but it is possible.
>
> > Linux ptb3 2.2.19 #2 SMP Tue Jul 24 11:53:29 CDT 2001 i686 unknown
> >
> > We are using:
> > lvm_0.9.1_beta7
> > reiserfsprogs-3.x.0j
>
> Get newer LVM tools, like 1.0.1, because the old ones have lots more bugs.
> Beta 7 has the PE alignment bug, so you should upgrade the tools even if
> you can't upgrade the kernel.
>
> > Here is the current filesystem and size:
> >
> > /dev/exp300_2/exp300_lv2 924160464 891307744 32852720 97% /files1
>
> > Q: Why are my logical volumes limited to 256 GB in size?
> > A: This is NO absolute limit but it depends on the physical extent size
> > you configured at volume group creation time.
>
> Check what "pvdata -P /dev/whatever" tells you about the PE size. If
> it is 16386kB, then you are limited to 1TB in size. If it is larger
> than that, you _may_ be able to go past 1TB, but you may not, depending
> on whether your drivers and kernel work properly or not.
>
> Cheers, Andreas
> --
> Andreas Dilger
> http://sourceforge.net/projects/ext2resize/
> http://www-mddsp.enel.ucalgary.ca/People/adilger/
>
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