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Backup Exec not compressing

Hi

since 2 weeks ago i got a few tape drives that stopped compressing data when running backup.

Windows Server 2003 Std 32bit (backup server only)
Backup exec 12.5 loaded
HP ultirum 4 Scsi ( Firmware W25D )
Hp LTO4 tapes (brand new and exisiting tapes tested) compression 1.05:1(bad)
Hp Ultium 3 Scsi ( Firtmware D22D )  compressing fine 1.79:1
HP LTO 3 Tapes (still working fine)

any ideas why my LTO4 tape drive stopped compressing data all of the sudden. Only getting uncompressed amount of data on tape , 800gb uncompressed , 1.6tb *assuming 2:1 compression.

I thought it was the tapes so i tested a new one , still the same.
Tried Backup exec 2010R3 and still the same.
It worked a few weeks ago ? what changed? any ideas to fixing the issue?
Tapes.JPG
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Zniper
Asked:
Zniper
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1 Solution
 
andyalderSaggar makers bottom knockerCommented:
Download HP L&TT from HERE , use it to create known compression ratio data in a folder, back up just that folder and see what compression ratio you get. You can also get a diagnostic report for the drive.
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Norm DickinsonGuruCommented:
You may be low on system resources, including RAM or the swap file or physical hard drive space where the compression is taking place.
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ZniperAuthor Commented:
hi

tqfdotus cant see that being the issue because i tried altready just after the machine was restarted and still experiancing same issues.

where is the compression taking place on the server with the agent installed or on the backup server?
system-resources.JPG
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Norm DickinsonGuruCommented:
Typically the compression will take place where the agent is installed. Sufficient free disk space can be the culprit as the software needs some working room to do the compression. Check the minimum recommended requirements for the software. Did you recently upgrade to 12.5 or have you been using it right along?
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ZniperAuthor Commented:
have been using BE12.5 all along.

will check that out.

The drive got 1tb usable storage with 4.39gb left...
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andyalderSaggar makers bottom knockerCommented:
Compression takes place on the tape drive assuming the job properties are set up properly, but you are getting some compression so it may be that most of the data is not compressible.
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Norm DickinsonGuruCommented:
Under 5 GB left is likely the problem - can you free up an additional GB or two?
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andyalderSaggar makers bottom knockerCommented:
Not sure what you mean by stressful operation, compression has always been available on LTO drives. Data arriving at the drive is passed through the compression algorithm and also bypassing it and the smaller of the two is written to tape. Under the job and device properties it should be set to hardware compression.
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Sikhumbuzo NtsadaCommented:
Did you try creating a new Job and set the ratio to 1:1?

Read the link below.
http://www.symantec.com/connect/forums/backup-exec-2012-not-compressing-data-backups

...See last comment from "Colin Weaver"
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Scott CSenior Systems EnginerCommented:
Have you added encryption?  We recently did that and now our jobs are getting as good as compression as before causing us to spill over to two tapes.

Also you need to free up some HD space, in addition to possibly causing a BackupExec issue you will run into a host of other problems in a low disk space situation.

If this is a business enrivonment I would scan the drive for music, picture, and movie files that aren't business related and blow them away.
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ZniperAuthor Commented:
looks like it is the tape drive / tapes that is getting too old. new tape drive sorted the issue.
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andyalderSaggar makers bottom knockerCommented:
Yes, often the case. It's not a case of not compressing but of failed writes so it has to write the same data again further down the tape.
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