Hi, I get severe data corruption using an logical volume larger then 2 TB. Finally I was able to track down device mappper or lvm as last suspects. My first guess where problems with filesystems but recently I tried using md / RAID0 - and didnt have any errors of any kind. I would prefer using LVM since we want to use snapshots to simplify backup, but I have no clue how to further debug. On a system with 3 devices each larger then 1 TB and a logical volume striped over all devices some data gets corrupted while written (or read ?) from disk. This shows up as md5 or crc sums changes on sequenced reads of files if filecache is not involved (by reading a lot data). On ext2fs there are error while writing data (kernel: EXT2-fs error (device dm-0): ext2_new_block: Allocating block in system zone - block = 722239884), on other filesystems successive fsck/repairs shows corrupted metadata. The system setup is - Three 29160B Adaptec scsi-controller each with one ATA-Disk Raid sized 1240 GB, (dual PIII, HP DL360 G2, 2 GB Ram) - Volume group over all three devices, logical volume stripped full size (3.7 TB) - Filesystem either ext2fs/ext3fs (1.34), reiserfs (3.6.13) or xfs (2.6.25) - host:~ # lvm version LVM version: 2.00.33 (2005-01-07) Library version: 1.00.21-ioctl (2005-01-07) Driver version: 4.3.0 - 2.6.10 vanilla + 2.6.10-udm1 patches The problems where initially discovered on 2.6.8, tracked on 2.6.9-udm and also occurs if only 2 devices (sum 2.4 TB) are used. For a limited time I will be able to further debug the system though it takes some time to generate more then 2 TB of data (max seq read/write rate is ~80 MB/s). Jens -- Nur tote Fische schwimmen mit dem Strom _______________________________________________ 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/
