Re: [ADSM-L] 3592 drives no compression
2009-10-26 10:27:34
On Oct 26, 2009, at 9:42 AM, Lars-Erik Öhman wrote:
It´s generation 1 drives, and the driver is the latest from IBM
(September 2009).
I check in device manager and the driver version is 6.2.0.1
(3592J1A), and it even say in "Tape drive parameters" that
Compression capable is TRUE, and Compression enabled TRUE.
Okay - that helps narrow it down.
You indicate that the client options do not specify that the client
should be doing compression. Do some 'dsmc query options' to assure
that.
Another thing to check is whether the REGister Node that was used for
these clients specified COMPression=Yes - or check the session summary
report from recent backups, for compression indications.
Beyond that, the cause is obscure. I would pursue by defining a
temporary storage pool and mgmt class (for tape isolation) performing
a backup on a very large, ordinary-content file, look at the backup
statistics, then perform a Select on it in the Backups table to look
for comparable size there, to see if there is any compression in the
path to TSM. Outside of TSM, you might take a drive from TSM, mount a
spare 3592 tape via your OS and have a program write ordinary data to
it until EOT was reached, where it would report its progress, and you
could then assess compression.
Richard Sims
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- Re: [ADSM-L] 3592 drives no compression, Remco Post
- Re: [ADSM-L] 3592 drives no compression, Lars-Erik Öhman
- Re: [ADSM-L] 3592 drives no compression, Remco Post
- Re: [ADSM-L] 3592 drives no compression, Lars-Erik Öhman
- Re: [ADSM-L] 3592 drives no compression, Richard Sims
- Re: [ADSM-L] 3592 drives no compression, Lars-Erik Öhman
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Richard Sims <=
- Re: [ADSM-L] 3592 drives no compression, Lars-Erik Öhman
- Re: [ADSM-L] 3592 drives no compression, Robert Clark
- Re: [ADSM-L] 3592 drives no compression, Lars-Erik Öhman
- Re: [ADSM-L] 3592 drives no compression, Lars-Erik Öhman
- Re: [ADSM-L] 3592 drives no compression, Wanda Prather
- Re: [ADSM-L] 3592 drives no compression, Lars-Erik Öhman
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