You may also want to look at your VMM options. Can you cut and paste the output from a vmtune -a command to this post? (Or ioo and voo, whichever you want).
At 04:54 PM 4/12/2005 +1000, you wrote:
Dear All,
TSM Server 5.2.4 on AIX 5.2 with 6 GB memory. (p690 lpar) 3592 tape drives fibre attached. TSM Backup/Archive client 5.2
I have a large number of 2 GB files to archive directly to tape - the files are within filesystems on a SAN storage device. If I mount the filesystems locally on my TSM Server and archive them, I get a rather disappointing 22 MB/s when archiving to a single tape drive.
If I archive the same data in the same filesystems but by mounting them onto a remote AIX server and running the 'dsmc archive' command and send them over the Gb lan, then I get a far more satisfactory 37 MB/s (again, archiving to a single tape drive).
Why should performance archiving over the network be better than archiving locally? My remote server is similarly configured to my TSM Server - same version of AIX, backup/archive client, similar memory etc.
I have tried using SHAREDMEM but it made no difference. Also tried raising the TCPW from 64 to 128, no difference. Tried a TCPBuffsize of 512 instead of 32, no difference.
Indeed my client options are the same on both the TSM Server and the remote server.
Any suggestions gratefully received.
Server Options ============= BufPoolSize 512288 TCPW 64 TCPNODELAY YES TXNGROUPMAX 256
Client Options ============ COMMmethod TCPip Compression No TXNBYTELIMIT 2097152 TCPBUFFSIZE 32 tcpwindowsize 64 TCPNODELAY Yes
Regards,
Eric Winters Australia
Dave Canan TSM Performance IBM Advanced Technical Support [EMAIL PROTECTED]
