I was wondering if anyone has tweaked netbackup buffers for LTO2 drives on RHEL 5 64-bit? (primarily the network buffer, but the number and size of data buffers would also be nice) I have a 4 x 2.0 Ghz Xeon class backup server running RHEL 5 64-bit and NBU 6.5. Im getting very poor network backup performance (using both the NBU client and by mounting filesystems via NFS and backing them up locally) It's almost 10 times as slow as the identical backup done by a 2 x 1.5ghz sparc III solaris 10 based system. (both systems are at identical points in the network and latencies to the backup clients are identical) All the obvious things have been checked like NIC speed/duplex or memory shortages. There are no lost packets or any other transport related errors, its just grindingly slower. =p My current settings are: /usr/openv/netbackup/NET_BUFFER_SZ = 65535 (gone as high as 256k and as low as 32k) /usr/openv/netbackup/db/config/SIZE_DATA_BUFFERS = 262144 (tried everything from 24k - 256k) /usr/openv/netbackup/db/config/NUMBER_DATA_BUFFERS = 32 (tried 4, 16, 32, and 64 with no visible change in performance) I have heard rumors from various vendors that there have been various issues related to the generic scsi driver included in RHEL 5 (NBU uses the pass-thru sg driver for various things). I was thinking this might be the source of my performance problems. (however these issues the vendor brought to my attention were not performance related) Even the worst possible buffer settings shouldn't be 10 times slower than a similar system. Thanks for any info... CC -- redhat-list mailing list unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe https://www.redhat.com/mailman/listinfo/redhat-list
