> > I have a similar config (clustered Win2003 servers,
> > as storage nodes, with SAN disk space as AFTD devices), mostly for
SQL,
> > altho my largest is a file server (1.5TB).
>
>
> Michael, how did you setup VSS on the file servers ? Are you using
> space from the same drive for shadow storage volumes ?
I didn't set up the shares from the SAN, but I don't think we actually did
any configuration of VSS on the client. The client is a MS cluster,
Win2003 standard. I back up the clustered resource, which has a SAN disk
of about 1.6TB assigned to it (and it's close to full ...)
> After putting VSS*=OFF in the client's save operations , the backup
> became even slower.
> Weekly full backup for the clustered file servers take ~ 55 hrs :(
My last full (which I do Friday nights, after midnight) says it ran for
1200 minutes, so about 20 hours. That was backup to AFTD, then clone to
LTO-4 tape.
This is the biggest saevset on that file server I do:
name,savetime(22),sscomp(22),totalsize(3),nfiles
H:\Users 11/21/2009 1:21:38 AM 11/21/2009 12:27:03 PM 929 GB 873977
So it wrote about 1TB to disk in about 10.5 hrs, and the rest of the time
was spent cloning all that onto tape. Other jobs were also running, but
none as large, or as long, as that client.
I enumerate the folders I want backed up (i.e., I don't use ALL; I list
each directory separately; there are only a dozen top level directories on
the disk); it helps write more in parallel. That client has a parallelism
of 10 (I may bump it back up to 12).
I had limited the server paralleism, in an effort to track down
performance problems. So I dropped it from the standard 32 to 16. Now that
I have figured out the performance problems, I will increase it back to
the standard of 32.
I only backup about 2.1 million files total from this server; you backup
24M? That's probably the issue; Windows is a whole lot slower, the greater
the number of files (especially smaller files)
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