<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta content="text/html;charset=ISO-8859-1" http-equiv="Content-Type"> <title></title> </head> <body bgcolor="#ffffff" text="#000000"> Someone answered my reponse! Thanks Anyway. I've sorted things out. I've manage to set up a fairly large RAID fs on and intel xeon 32-bit server running RHEL4. As you suggest the solution was to go to a new fs (I chose XFS as Reiser seemed to behave strangely with LVM and the large filesystem). I just had to rebuild the kernel with xfs support. Things are running smoothly right now. In case anyone is interested there seem to be some limitations: 32-bit machines: ext3 : 2Tb (I managed to create a 4TB fs for some reason) xfs : 16 Tb reiser : 16Tb 64-bit: ext3: 2Tb (? not sure about this one) xfs and reiser: very large (> million Tb) One of the hardware support people said there was a 2Tb limit on the SCSI protocol (not sure about this), so I had to use LVM to create the large volume from a subset of RAID volumes even though the native capacity of the RAID unit was 16Tb. So the process was to divide and recollect the RAID volumes using LVM and xfs. Cheers, Guido Myrddin Emrys wrote: <blockquote cite="mid3b24531c0504291300587dd539@mail.gmail.com" type="cite"> <pre wrap="">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 <a class="moz-txt-link-rfc2396E" href="mailto:g.vettoretti@utoronto.ca"><g.vettoretti@utoronto.ca></a> wrote: </pre> <blockquote type="cite"> <pre wrap="">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 <a class="moz-txt-link-abbreviated" href="mailto:linux-lvm@redhat.com">linux-lvm@redhat.com</a> <a class="moz-txt-link-freetext" href="https://www.redhat.com/mailman/listinfo/linux-lvm">https://www.redhat.com/mailman/listinfo/linux-lvm</a> read the LVM HOW-TO at <a class="moz-txt-link-freetext" href="http://tldp.org/HOWTO/LVM-HOWTO/">http://tldp.org/HOWTO/LVM-HOWTO/</a> </pre> </blockquote> <pre wrap=""> _______________________________________________ linux-lvm mailing list <a class="moz-txt-link-abbreviated" href="mailto:linux-lvm@redhat.com">linux-lvm@redhat.com</a> <a class="moz-txt-link-freetext" href="https://www.redhat.com/mailman/listinfo/linux-lvm">https://www.redhat.com/mailman/listinfo/linux-lvm</a> read the LVM HOW-TO at <a class="moz-txt-link-freetext" href="http://tldp.org/HOWTO/LVM-HOWTO/">http://tldp.org/HOWTO/LVM-HOWTO/</a> </pre> </blockquote> </body> </html>