[OpenAFS] TSM and AFS

[Eric Sturdivant]

On Tue, 27 Sep 2005, Tony Derry wrote:

> Is anyone using Tivoli Storage Manager with AFS filesystems?  This is a 
> terribly slow solution and we havnt been able to find an acceptable 
> alternative.  We are using a P650 as a server and LTO2 tape drives.  We 
> recently did a restore of 20 GB that took 27 hours.  Non AFS data can be 
> restored at about 50 GB per hour.
>
> Any ideas would really be appreciated.  Thanks.
>
> t.
>
>
>
> Anthony Derry, Manager
> University of Maryland, OIT
> Enterprise Storage Services
> Building 224, Rm. 1317
> College Park, Md. 20742
> aderry@umd.edu 301-405-3059
>
>
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>

A bit more on our current setup:

We have a modified butc which works on solaris with modern TSM clients. 
Each of our fileservers runs butc processes to dump volumes to the TSM 
server. This works just fine. The problem we have is in doing entire 
server or partition restores, butc will restore each volume in sequence, 
causing the TSM server to thrash around in the tapes, getting each little 
diff from all the volumes. Co-location has helped the problem a bit, 
cutting down on the number of tape mounts, but not the seeks through the 
tape.

The only thing we can think to do at this point is to throw disk at the 
problem, and keep as much of the dumps on disk as possible. (This, of 
course, is expensive...)



-- 
Eric Sturdivant
University of Maryland
Office of Information Technology
Distributed Computing Services
(301) 405-8473
<sturdiva AT umd DOT edu>
http://www.oit.umd.edu/dcs