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Re: [Veritas-bu] DSU - Quick Question
2008-05-20 09:10:57
On Tue, May 20, 2008 at 7:45 AM, WEAVER, Simon (external) <simon.weaver AT astrium.eads DOT net> wrote:
Just curious really, got a backup job that takes 3 hours and is is streamed and uses Multiplexing to LTO3 Tapes.
I am going to create a DSU on this Server (which will be a seperate disk volume connected to the Windows Client) and see how long it takes for the backup job to run.
My question is this.... do I keep the streaming in place, or should I just reconfigure my policy to backup the single volume in one chunk.
That depends on where your bottleneck is. If a single-stream read from disk saturates your client, then there's nothing to be gained by multi-streaming. Multi-streaming will add load to the client. We've found that 32-bit Windows clients feel the load a lot more than 64-bit clients. With multiple volumes being backed on a single 32-bit client, we've even seen Windows tip over on large file systems.
Don't rule out FlashBackup even when backing up to DSU or DSSU - the savings are still there on file systems with a large number of files.
.../Ed
Ed Wilts, Mounds View, MN, USA
RHCE, BCFP, BCSD, SCSP
mailto:ewilts AT ewilts DOT org
If I've helped you, please make a donation to my favorite charity at http://firstgiving.com/edwilts
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