[Date Prev][Date Next]   [Thread Prev][Thread Next]   [Thread Index] [Date Index] [Author Index]

[linux-lvm] large logical volumes



Hello,

I'm trying to set up a large logical volume (13.1 TB) on a RHEL 4.0 server. I have 8 scsi devices of 1.8Tb each.

When I try to do a 'mkfs' and set up a large disk I get limited to 4Tbytes.
This command creates a smaller filesystem then
[root cyclone ~]# lvcreate -l 1287525 -i 3 -n lvol0 vol0
this one.
[root cyclone ~]# lvcreate -l 1000000 -i 3 -n lvol0 vol0

It seems that there is a limit on the number of block groups of 32768 and blocks per group of 32768.
My block size is 4096
so I can only get an LV of 4096*32768*32768 = 4TB.


I tried modifying the PE size on the volume group, but I'm still having problems.

Can anyone help please?

Thanks
Guido
---------------
[root cyclone ~]# mkfs -t ext3 /dev/vol0/lvol0
mke2fs 1.35 (28-Feb-2004)
max_blocks 4294967295, rsv_groups = 0, rsv_gdb = 1024
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
512016384 inodes, 1024002048 blocks
8250429 blocks (0.81%) reserved for the super user
First data block=0
Maximum filesystem blocks=1027604480
31251 block groups
32768 blocks per group, 32768 fragments per group
16384 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968,
102400000, 214990848, 512000000, 550731776, 644972544



Here is the entire process I typed: ------------------------------------------------------------------------------

[root cyclone ~]# pvcreate /dev/sdc1 /dev/sdd1 /dev/sde1
Physical volume "/dev/sdc1" successfully created
Physical volume "/dev/sdd1" successfully created
Physical volume "/dev/sde1" successfully created
[root cyclone ~]# pvscan
/dev/cdrom: open failed: No medium found
PV /dev/sda2 VG VolGroup00 lvm2 [34.06 GB / 0 free]
PV /dev/sdb1 VG VolGroup00 lvm2 [34.16 GB / 0 free]
PV /dev/sdc1 lvm2 [1.64 TB]
PV /dev/sdd1 lvm2 [1.64 TB]
PV /dev/sde1 lvm2 [1.64 TB]
Total: 5 [4.98 TB] / in use: 2 [68.22 GB] / in no VG: 3 [4.91 TB]
[root cyclone ~]# vgcreate vol0 /dev/sd[c-e]1
Volume group "vol0" successfully created
[root cyclone ~]# vgdisplay
--- Volume group ---
VG Name vol0
System ID Format lvm2
Metadata Areas 3
Metadata Sequence No 1
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 0
Open LV 0
Max PV 0
Cur PV 3
Act PV 3
VG Size 4.91 TB
PE Size 4.00 MB
Total PE 1287525
Alloc PE / Size 0 / 0 Free PE / Size 1287525 / 4.91 TB
VG UUID fQ7cKh-FVnl-NglQ-jimv-RsZK-dU5j-zYKIcG


[root cyclone ~]# lvcreate -l 1287525 -i 3 -n lvol0 vol0
Using default stripesize 64KB
Logical volume "lvol0" created
[root cyclone ~]# lvdisplay
--- Logical volume ---
LV Name /dev/vol0/lvol0
VG Name vol0
LV UUID c2MADb-BoAO-lhl3-3ukj-XfyQ-K8L0-cxcIlw
LV Write Access read/write
LV Status available
# open 0
LV Size 4.91 TB
Current LE 1287525
Segments 1
Allocation inherit
Read ahead sectors 0
Block device 253:2
[root cyclone ~]# mkfs -t ext3 /dev/vol0/lvol0
mke2fs 1.35 (28-Feb-2004)
max_blocks 4294967295, rsv_groups = 0, rsv_gdb = 1024
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
122355712 inodes, 244683776 blocks
12234188 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=247463936
7468 block groups
32768 blocks per group, 32768 fragments per group
16384 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968,
102400000, 214990848







[Date Prev][Date Next]   [Thread Prev][Thread Next]   [Thread Index] [Date Index] [Author Index]