From Bugzilla Helper: User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322) Description of problem: Hi, I am using Redhat AS 3.0 (Update 3) with "2.4.21-20.ELsmp" Kernel with a 2 node RAC running OCFS (ocfs-2.4.21-EL-smp-1.0.13-1).Shared disks reside on a HP MA8000 SAN and are connected to the server using QLogic 2340 HBAs.Every server has only one HBA.Before upgrading to Kernel 2.4.21-20.ELsmp I was getting decent performace with tape backups and restores which is done over the network using HP Data Protector 5.but after the upgrade the performance of backups/restores have degraded considerabley.One intresting thing I noted was that when the backup is running and if I start a dd read process on the other shared file system in the same server, the backup speed picks up almost 2-3 times.But doing the same with restore doesn't help at all. Is there any bug with kernel 2.4.21-20.ELsmp which is causing this behavior? Thanks. Ashish Version-Release number of selected component (if applicable): 2.4.21-20.ELsmp How reproducible: Didn't try Additional info:
Kernel 2.4.21-20 was RHEL3-U3 and that kernel had a bug in which inodes were not preperly reclaimed. That bug was fixed in RHEL3-U4/kernel-2.4.21-27, can you grab that kernel or even the latedt RHEL3-U5 kernel and see if the problem you described is fixed? Thank You, Larry Woodman
Hi, I installed "2.4.21-27.0.2.ELsmp" kernel and ran the backups again but still the same result. By running a "dd read" process on another filesystem which is using a separate disks (LUN) makes the backup to run almost 10 times faster. Thanks. Ashish
At this point I think we need to have Oracle look at this sice its OCFS and from what I can tell its not happening on other file systems. Larry
Hi, I did a test by creating a EXT3 filesystem on the same disks.The backup speed was fine but the restore to the same disks using the same backup was half slower. Can there be a bug in the drive of Qlogic card? Thanks. Ashish