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:ADSM-L AT VM.MARIST DOT EDU]On Behalf Of
Bernd Schemmer
Sent: Monday, September 08, 2003 8:46 AM
To: ADSM-L AT VM.MARIST DOT EDU
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: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
>
> --
>
>
--
----------------------------------------------------------------------------
------------
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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