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ArcServe 2K compression does not work on win2k

Hi, im using arcserve 2k on a dell poweredge 2650 running windows 2000. I'm using a Spectra 2k which uses 2 Sony SDX-500C tape drives that support hardware compression.

  I have  read many if not all the topics related to this issue and i still can not get compression to work. I've checked the device and both tape drives show hardware compression on, i've also used a the testing software from specralogic to test the tape backup unit and it has compressed test data successfully.
  I've attempted backing up the server locally, the raid attatched to the server, and a raid attatched to sun we also have running here. i get zero compression on all backups, i'm using 50/100 AIT2 tapes and once they get to exactly 50 a new take picks up.

  This has been driving me up a wall for 2 weeks now, i can not get any compression and i know it was working before when the tape back up was attached to an older server running windows NT. I've tried everything listed in the Faq as far as compression is concerned the drive only supports hardware compression i can not turn it off to try using software compression.

I would appreciate any help i could get thank you.
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MConville
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MConville
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dovidmichelCommented:
No idea.

This is the first I've heard of where ARCserve reports compression enabled and yet only the native capacity is written to tape.

ARCserve can enable/disable compression but can not dictate the rate of compression. Once enabled the rate of compression is up to the data being backed up and the drive itself. The OS and ARCserve can not effect the rate of compression.

How do you know that only 50gb are being written to each tape?

What type of data is being backed up?
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MConvilleAuthor Commented:
ARC serve log indicates that 50gb written to tape one. Remainder 25gb written to second tape
Normal data files
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dovidmichelCommented:
How is it making this indication?

Is it an entry in the activity log, the database, or a report?

If it is from the activity log copy that portion of the log in.
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MConvilleAuthor Commented:
im backing up 50.8GB of data, a mix of ghost images and random files for testng purposes. When i check the tapes after the backup is complete it shows total size for the job as 50.8GB, it does not show the amount of data writen to each tape but when you check the proporties of the tapes themselves one tape is at 48GB with 2GB of softwrite errors and the second tape of the job it as 2.8GB writen. Its not a log of each tape but it clearly shows 50.8GB of data is being backup but with no compression.
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dovidmichelCommented:
Does Ghost compress the data it copies?

Compressed data can not be compressed. So for example if you backed up 50gb of jpg, mp3, zip, or any compressed data it will fill up the tape.

The 50/100 does not mean 50gb native and 100gb with compression. It means 50gb native and the guys in Marketing said to use 100gb for compression. In real life it totally depends on the data. So as mentioned if 50gb of compressed data is backed up there will be no compression.

Here is another thing to think about. SoftWrite errors = bad spots on tape. The drive tried to write data but failed so it moved the tape to the next block and retried. It keeps doing this until the data is written correctly or until a preset threshold is exceeded and it becomes a HardWrite or Media error. So the more SoftWrite errors the more space on tape is wasted.
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dovidmichelCommented:
Do you still need help with this?
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dovidmichelCommented:
Do you need any more help with this question?
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dovidmichelCommented:
Do you need any more help with this question?
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dovidmichelCommented:
Do you need any more help with this question?
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rindiCommented:
MConville,

No comment has been added to this question in more than 21 days, so it is now classified as abandoned..
I will leave the following recommendation for this question in the Cleanup topic area:
accept: dovidmichel

Any objections should be posted here in the next 4 days. After that time, the question will be closed.


Rindi
EE Cleanup Volunteer
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