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Hi Ed
Thanks. There is no bottleneck here, just trying to see if
DSU will be quicker than Tape LTO3. When I done my initial test, the tape backup
was faster than the tape.
So I am happy with the tape. I am happy with the time it
takes.
the data is not a mega large amount, but I just wanted to
pop the question on the list to see if there was a benefit in retaining the same
policy with its streams, or amend the policy to backup one volume and tell it to
use a DSU on a brand new volume on the same physical server
:-)
FlashBackups are not going to be considered on this
occasion, but will be looked into for a larger 2TB Volume with a mix and match
of files, folders, ect.
Simon :-)
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
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