Hi Guys, I have a server running CentOS 4.2 with a 2.6.9-22EL-smp kernel. The system contains a 2.3 TB RAID 5 array. There is a 20GB root partition with the remainder of the drive configured one large LVM volume. (/u0) I have installed Veritas Netbackup on the server and am running a few tests. Small backups and restores work just fine. When I run a larger backup (500MB) and store the backup file on /u0/vrts the files within the backup cannot be restored. I thought at first this was a Veritas problem but have also discovered... I cannot do any of the following to the backup file: Use cat, dd or cp to copy the file. The first part of the file aproximately 24MB will copy and then I get the error message: Input/output error Checking dmesg shows: dm-0: rw=0, want=31933816664, limit=4838391808 attempt to access beyond end of device dm-0: rw=0, want=32472792952, limit=4838391808 attempt to access beyond end of device dm-0: rw=0, want=33011769240, limit=4838391808 attempt to access beyond end of device dm-0: rw=0, want=33550745528, limit=4838391808 attempt to access beyond end of device dm-0: rw=0, want=34089721816, limit=4838391808 How do I access the files in question? Any suggestions or enlightment would be greatly apreciated. Shawn
A few relevant comments (inline below) On Saturday 30 September 2006 07:10, Shawn Everett wrote:> Hi Guys, > > I have a server running CentOS 4.2 with a 2.6.9-22EL-smp kernel.Why not run a fully updated centos-4?> The system contains a 2.3 TB RAID 5 array. There is a 20GB root partition > with the remainder of the drive configured one large LVM volume. (/u0) > ... > I cannot do any of the following to the backup file: Use cat, dd or cp to > copy the file. The first part of the file aproximately 24MB will copy and > then I get the error message: Input/output errorBooting from it implies that you have a "normal" partition table on the 2.3T device, this does not work (dos style MBRs only works with <2T). Most people boot from a small and independent device and uses gpt (see parted) on the big device or no table at all (lvm directly on the device). Good luck, Peter> Checking dmesg shows: > dm-0: rw=0, want=31933816664, limit=4838391808 > attempt to access beyond end of device > dm-0: rw=0, want=32472792952, limit=4838391808 > attempt to access beyond end of device > dm-0: rw=0, want=33011769240, limit=4838391808 > attempt to access beyond end of device > dm-0: rw=0, want=33550745528, limit=4838391808 > attempt to access beyond end of device > dm-0: rw=0, want=34089721816, limit=4838391808-------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: application/pgp-signature Size: 189 bytes Desc: not available URL: <http://lists.centos.org/pipermail/centos/attachments/20060930/ca514926/attachment-0001.sig>
> Why not run a fully updated centos-4? > > > The system contains a 2.3 TB RAID 5 array. There is a 20GB root > > partition with the remainder of the drive configured one large LVM > > volume. (/u0) ... > > I cannot do any of the following to the backup file: Use cat, dd or cp > > to copy the file. The first part of the file aproximately 24MB will > > copy and then I get the error message: Input/output error > > Booting from it implies that you have a "normal" partition table on the > 2.3T device, this does not work (dos style MBRs only works with <2T). > Most people boot from a small and independent device and uses gpt (see > parted) on the big device or no table at all (lvm directly on the > device). >Hi Peter, I took your advice. I upgraded to CentOS 4.4 and then further upgraded the kernel to the official 2.6.18 kernel. I installed a basic IDE drive and did the OS load on to that drive. The remaining disks were resetup using hardware RAID 5 and LVM was setup directly on the device (no partitions). Also to avoid any issues with large file systems and EXT3 I setup and formatted the LVM with JFS. It's worth noting that a mkfs.jfs on 2.3TB took about 10 seconds! For some odd reason the CentOS kernel doesn't support JFS so a recompile was in order. Downloading and installing jfsutils was trivial. Try as I might, I have not yet been able to reproduce the problems that caused me stress. I can create multi GB files without a problem. I can move files into and out of the partition without an error. I'm taking this as a good sign. I'm also not seeing any disk access errors in dmesg! Shawn