Brad, I'm sure that's it. It now makes sense that you see some tapes with less than the actual capacity of the cartridge. You are doing a hardware compression on software compressed data, but at least you know your hardware compression is working!
Bill Smoldt STORServer, Inc. -----Original Message----- From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED] Behalf Of Bernd Schemmer Sent: Monday, September 08, 2003 8:46 AM To: [EMAIL PROTECTED] Subject: Re: How to check if TSM is using hw compression? Bill, thanks for your answer. >>If this is a copy storage pool for your primary server, what are the >>server to server device class settings? I just did a on the TSM server tsm: TSM2>q node type=server f=d and found that compression is enabled for the client: Compression: Client I think, that might be the reason for the problem. I'll change it tomorrow and see what happens. Bernd Bill Smoldt wrote: > Bernd, > > The device class is the only place within TSM where you can affect > compression. > > It's been a long time since I've used a drive without compression, but I > believe you'd see a more consistent capacity with compression turned off. > If you were consistently getting 37G, I could believe that compression was > turned off, but you have tapes with more and less than that. > > If this is a copy storage pool for your primary server, what are the server > to server device class settings? > > A "query content <volume_number> f=d" will show you the stored size of a > file on tape. > > Bill Smoldt > STORServer, Inc. > > -----Original Message----- > From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED] Behalf Of > Bernd Schemmer > Sent: Saturday, September 06, 2003 9:53 AM > To: [EMAIL PROTECTED] > Subject: How to check if TSM is using hw compression? > > > Hello, > > Using TSM 5.1.6.2 on Solaris 8 with a Sun L20 Tape Library (using DLT8000 > drives) how can I check if TSM uses the hardware compression of the drives? > > We use the TSM driver to access the drives (so there's no special driver > for using the drives in compression mode). The only way to configure hw > compression in TSM I found is to configure the approbate drive format in > the device class (DLT35C or DLT40C) (Is there another way to configure > the hardware compression?) I did this but TSM still only writes about > 37.000 MB on 35/70 GB DLT IV Tape. This is independent from the kind of > data written. We use the server only for a Copy Storage Pool of our > primary server. The data to backup is mostly Oracle DBs, Filesystem > backups, Domino Data backups, etc. > > Some TSM output: > > tsm: TSM2>q volume > > Volume Name Storage Device Estimated Pct Volume > Pool Name Class Name Capacity Util Status > (MB) > ------------------------ ----------- ---------- --------- ----- ------ -- > /tsm/01/archive/archive- ARCHIVEPOOL DISK 20,000.0 0.0 On-Line > pool_vol001.dsm > /tsm/01/backup/backuppo- BACKUPPOOL DISK 20,000.0 0.0 On-Line > ol_vol001.dsm > ARZ00016 LIBRARYL20 DEV1 38,621.3 94.1 Full > ARZ0003 LIBRARYL20 DEV1 35,305.2 100.0 Full > ARZ0004 LIBRARYL20 DEV1 71,680.0 19.4 Filling > ARZ0005 LIBRARYL20 DEV1 31,060.1 100.0 Full > ARZ0006 LIBRARYL20 DEV1 71,680.0 26.7 Filling > ARZ0011 LIBRARYL20 DEV1 45,654.5 100.0 Full > ARZ0013 LIBRARYL20 DEV1 37,968.0 100.0 Full > ARZ0014 LIBRARYL20 DEV1 37,125.2 100.0 Full > ARZ0015 LIBRARYL20 DEV1 33,276.5 100.0 Full > ARZ0016 LIBRARYL20 DEV1 40,359.1 100.0 Full > ARZ0017 LIBRARYL20 DEV1 38,636.0 99.7 Full > ARZ0018 LIBRARYL20 DEV1 37,670.3 100.0 Full > ARZ0019 LIBRARYL20 DEV1 37,165.9 100.0 Full > ARZ0021 LIBRARYL20 DEV1 33,153.4 100.0 Full > > tsm: TSM2>q devclass dev1 f=d > > Device Class Name: DEV1 > Device Access Strategy: Sequential > Storage Pool Count: 1 > Device Type: DLT > Format: DLT35C > Est/Max Capacity (MB): 71,680.0 > Mount Limit: 2 > Mount Wait (min): 60 > Mount Retention (min): 60 > Label Prefix: ADSM > Library: L20 > Directory: > Server Name: > Retry Period: > Retry Interval: > Shared: > Last Update by (administrator): ADMIN > Last Update Date/Time: 09/04/03 12:13:27 > > > Looking at this output I think, that TSM does not use the hardware > compression at all. Or am I wrong? > > > TIA > > Bernd > > -- > > -- ---------------------------------------------------------------------------- ------------ Bernd Schemmer, Stalburgstr. 14, 60318 Frankfurt, Germany email: [EMAIL PROTECTED] Phone/Fax: +49 - 69 / 95520301 mobil: +49 - 179 / 4647978
