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I would try to isolate the problem.
Take two new tapes from the VTL. Move them to a new pool Create a test policy that backs up directly to the VTL and fills the two tapes.
See if that repeats the behavior of the second tape being. This will tell you whether duplication is involved. If the second tape is slow: expire all images on test tapes with bpexpdate.
Repeat the backup. If the problem goes away then the VTL tape is only slow on the first write. If not, you have a different problem.
Chris V. On Thu, Jun 9, 2011 at 12:35 PM, nmagsaysay <nbu-forum AT backupcentral DOT com> wrote:
I'm writing my jobs to VTL then using SLP to get them to LTO5. I've noticed that when i start a job it jumps right up and the speed is 25MB - 40MB then after the "tape" fills and a second one is "loaded" the KB/Sec drops to 2MB - 4MB and the speed never raises for subsequent "tapes".
However when I write directly to LTO5 the jobs average 40MB - 60MB. Using an EMC Clarion VTL. Any advice would be greatly appreciated.
Is there a log in NBU that would indicate these write speed fluctuations? Any thoughts would be greatly appreciated.
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