Re: How to check if TSM is using hw compression?
2003-09-08 09:45:33
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:ADSM-L AT VM.MARIST DOT EDU]On Behalf Of
Bernd Schemmer
Sent: Saturday, September 06, 2003 9:53 AM
To: ADSM-L AT VM.MARIST DOT EDU
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
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Bernd Schemmer, Stalburgstr. 14, 60318 Frankfurt, Germany
email: Bernd.Schemmer AT gmx DOT de
Phone/Fax: +49 - 69 / 95520301
mobil: +49 - 179 / 4647978
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