I'm having some performance/thruput discrepancy problem with LTO-2 drives
and want to seek suggestions to resolve my problems.
My backup infrastructure has the following:
- Software
NBU DataCenter 4.5FP8
- NBU master+media server (running Solaris 8):
Sun Fire-280R: PCI1 slot has Dual-Channel Ultra320 SCSI-Channel Card
PCI3 slot has Dual-Channel Ultra320 SCSI-Channel Card
- Tape Library:
Sun L100 w/ 3 x LTO-2 drives w/ LVD SCSI controller
And, I have the following physical SCSI connectivity:
PCI1 top channel -> HP LTO-2 Drive2 in Sun L100 Library
PCI1 bottom channel -> HP LTO-2 Drive3 in Sun L100 Library
PCI3 top channel -> HP LTO-2 Drive1 in Sun L100 Library
PCI3 bottom channel -> Sun L100 Library controller
(each SCSI channel is properly terminated with an LVD SCSI terminator)
A problem that I'm having is that Drive1 runs at around 24-27MB/sec while
Drive2 at 16-17MB/sec to back up the same host at the same time (the 2
drives concurrently running).
Any recommendation for this situation? Would getting a 3rd Ultra320 SCSI
card and connecting each tape drive from a dedicated SCSI card be something
worth trying to resolve this performance discrepancy problem?
Thanks for your help in advance!
- Young
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