tapebackup , poweredge 2600 suppot compression

Question

I try make compression with software brightstor ARCServe, this software have the option and i change the paremeter but never compress the information, the ARCServe support tell me what i need verify in the hardware options, how can i review this?,

thanks

dell-richard g · Answer

What tape drive model do you have?

What catridge media type are you using?

Can you explain why you think compression is not occuring? What type of data set are you trying to backup?

ARCserve should default to hardware compression, so you do not have to change any setting.

johnluna · Answer

the model backup is - DELL PV-100T

the model datacartridge is - DDS4 12 normal/24 compress Gigas

The data type is , files users, database, system state, data base exchange.

The size of backup is 16 Gb, and the process required two tapes.

Many thanks

johnluna · Answer

the model backup is - DELL PV-100T

the model datacartridge is - DDS4 12 normal/24 compress Gigas

The data type is , files users, database, system state, data base exchange.

The size of backup is 16 Gb, and the process required two tapes.

Many thanks

DonaldI · Answer

Dear Dell,   Having a similar problem on a PE2600 server asset tag : 4GXXM0J.   The system has a DDS4 internal tape drive - pv-100t.   The OS is Netware 6 sp3. The backup software is Brightstor Arcserve V9. Tape server version 617.007.   We only seem to be getting just above 24 Gb on the tape (confirmed as DDS4), so it appears as though either compression is not working or we are getting little back from compression. The tape headers show that compression has been used.   I tend to the view that compression is not happening as we have several other 2600s with similar datasets which don't have the same problem.  The server in this instance is being used as a standard file server. The majority of files are MSoffice document types. There are no databases and very little in the way of graphics, so I would expect to get substantially more back from compression. We are thinking about getting a tape drive with a higher capacity, but it does puzzle me that we're not getting more 'bangs for our buck', with this device.

NickMar2 · Answer

I am having the same problem on my Dell Poweredge 2600 and 2500 Servers.  They are all running Windows 2000, and using Microsoft NT Native Backup.  All have PV100T Tape drives.  Most sites are using the Fuji 4mm DDS Dat 4 20/40  150 M tapes.  Some are using the Dell tapes.  We run into the compression problem on the Full Backups to tape, the differentials are not anywhere near 20 gb.  I have seen where some backups, (not many, actually this is rare) will compress 24 to 30  gigabytes of data, then the next full backup will only fit 20 to 21 gb on one tape.  Then we have to go to a 2 tape backup which will not verify the data, it hangs after the tape is inserted in the drive the second time for the verify process.  (another problem, another post).  These are all scheduled backups.  The scripts and batch files that run them have hardware compression on '/hc on'.   I can supply the entire script.  Compression is enabled and verified this through the utility Tapedrive.exe.  I have done the following in all instances: Re-Copied backup scripts and batch files from a server getting known good backups. Cleaned tape drive with cleaning tape.  -     Used new tapes -  Reinstalled tape drive. Copied new 4mmdat.sys driver into system32 folder.  Tape drives have been replaced, (not in all instances)  still no compression.  This is a monster of a problem in our network.   Can anyone can offer suggestions or resolution.   I can supply service tags if needed.

PowerVault

tapebackup , poweredge 2600 suppot compression

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