Looks like you never got a response. I hardly consider myself qualified, but have you considered increasing the block size? The other option, have you tried a different filesystem? Different fs have different limitations... what you're describing appears to be a limitation of ext2fs, not LVM. Have you considered XFS or ReiserFS? On 3/30/05, Guido Vettoretti <g.vettoretti@utoronto.ca> wrote: > 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 > > _______________________________________________ > linux-lvm mailing list > linux-lvm@redhat.com > https://www.redhat.com/mailman/listinfo/linux-lvm > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ > _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
