I don't have enough info to say this for sure, but my first suspicion is
that your filesystem has gotten spread out across a lot of tapes. So it
mounts a tape, spins up to the right location, and gets blazing speed.
Then it needs to mount the next tape and spin up to the location of the
next group of files, which is when speed plummets. Try doing a MOVE
NODEDATA NODENAME before you do the restore, which will put all the
files back on as few tapes as possible. It's not practical to do this
before all restores, but it will tell you if tape sprawl is your
problem. If it is, and if this node is important enough, you might want
to look into collocating that node (or group of nodes).
>>> alazarev AT ITG.UIUC DOT EDU 12/21/2005 1:47:22 PM >>>
TSM server 5.3.1 on 2K server. Libraries are one Overland Neo 4100 with
2
LTO2 drives, and an Overland Neo 4100 with 2 LTO3 drives.
I'm restoring a windows client workspace. Client is running TSM backup
client version 5.3.0. Originally, the client was 5.1.9.0, and it was
with
this version that we first created the backup of the workspace drive
on
the client.
Now I'm trying to restore that workspace filespace to the new system.
The
restore started fine, 30MB+/sec in our GigE network. But at times the
restore speed slows to a halt, and restore speeds are less than
1MB/sec,
sometimes only 200-300K/sec. Then a little later it will start to go
30MB/sec again. It is switching back and forth, sometimes in the middle
of
a file! The server is currently trying to restore an 86MB file, but
it's
doing so only at 300K/sec. Being that the workspace is 244GB, this is
unacceptable speed.
The client data is on the LTO2 library. There is absolutely nothing
unusal in the logs that would indicate any kind of problem on the drive
or
the tape. No errors are being reported whatsoever.
The client filespace is NOT compressed on the client side. Compression
happens on the drives (HP).
The client hardware is excellent, dual AMD opteron, with 3G SATA drives
in
striped RAID, XP Pro. Plus the client at times restores at 30+MB/sec so
I
know it can do it.
Network on the client is not busy, and the network switch is not
saturated, in fact there is very little network activity.
It just seems like the server decides to go fast at times and then
sometimes very slow. But with nothing in the logs I don't know what to
troubleshoot. Any idea where to start troubleshooting this problem?
Anyone
seen this type of behavior before?
Thanks!
Alex
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