[Veritas-bu] NetBackup Disk Staging Performance Questions
2007-03-01 08:05:47
Subject: |
[Veritas-bu] NetBackup Disk Staging Performance Questions |
From: |
ewilts at ewilts.org (Ed Wilts) |
Date: |
Thu, 01 Mar 2007 07:05:47 -0600 |
On 2/28/2007 10:34 PM, Anthony Segran wrote:
> /Is SATA a common choice out there for DSSU's?
We use FATA drives - not much difference between them and SATA really.
> //We experienced slow performance during duplication, on both HDS 9585
> arrays and NetApp 3020 over FCP. We're currently talking to NetApp about
> 3020 performance issues, so do you know of other NBU customers using
> NetApp 3020's for DSSU's?/
This appears to be a NetBackup issue and we're working directly with
Symantec engineering on our destaging performance issues. We believe
we've got the right people at Symantec involved, we've given them a lot
of data, and they've already been out to visit us. They're actively
working this issue. There are many factors involved and we don't know
yet if it's a NetBackup bug, design issue, or a customer configuration
issue. If it's the latter, it's not going to do you much good. The
logs currently claim that we can't read off of disk fast enough to drive
a single LTO-3 drive but we've demonstrated using non-NBU tools that we
can read at 380+ MB/sec off of disk (essentially saturating the HBAs)
and the LTO-3 isn't that fast (don't we wish!). If I get something
definitive that I can pass on, I'll post to the list. You and I are not
the only people that have posted about destaging performance.
> /Another DSSU related issue we're seeing is orphan images left on the
> DSSU from failed/incomplete jobs. We've turned the appropriate logs on
> and will be clearing these out manually and escalate again if/when we
> see further occurrences. Support assure us that this is not a
> normal/reported issue with NBU.
We use DSSUs a *lot*. We saw this issue regularly in pre-6.0MP4 days
but have not seen it since. We worked with Symantec extensively during
the MP3 -> MP4 development cycle. Continue working with support and
escalate the case if you need to. Obviously orphan images are a bug and
they're supposed to be cleaned up automatically.
.../Ed
--
Ed Wilts, Mounds View, MN, USA
mailto:ewilts at ewilts.org
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