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Software/Hardware Compression

Shannon1
Level 2

‎06-16-2008 07:31 AM

I'm experiencing abit of an issue with BackupExec 11d where I am only getting a 200gb backup out of a 200/400gb device.  I'm using an IBM HH Gen2 LTO drive with an IBM x3550 server on windows 2000.
 
I have selected to use hardware compression within the backup configuration but clearly this has not worked.  So I was wondering if anyone else had come across this?


Message Edited by Shannon1 on 06-16-2008 07:31 AM
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5 REPLIES 5

Ken_Putnam
Level 6

‎06-16-2008 10:52 AM

From the devices tab, right click the drive\properties
Is "enable hardware compression" selected?
 
is there an Enable Compression switch on the drive itself?  If so, is it set to Enable or Disable?
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Shannon1
Level 2

‎06-17-2008 12:53 AM

I have Compression enable within properties and have Block and Buffer size set to the 64k defaults.
 
having a look at the tape drive there are no switches to turn compression on or off
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Ken_Putnam
Level 6

‎06-17-2008 10:12 AM

Jut for grins, try a run with software compression instead
 
How much data do you get on a single volume that way?
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Shannon1
Level 2

‎06-18-2008 12:40 AM

I get 213,128,419,355 bytes with the software compression which is only a little better than the 202,611,455,835 bytes I get with none.
 
I have also tried running an SGMON and during the log it tells me
 
BkupExec: [2448] 06:17:08 09:20:36.606 Media count for IBM 1 = 1
bengine: [3212] 06/17/08 09:20:37 HARDWARE COMPRESSION ===> Compression is configurable.
bengine: [3212] 06/17/08 09:20:37 GET_DRV_INF: bsize = 65536
bengine: [3212] 06/17/08 09:20:37 HARDWARE COMPRESSION ===> Setting compression off.
bengine: [3212] 06/17/08 09:20:37 TF_GetDriveContext returning 0x00000000, context = 2C8BAD0
bengine: [3212] 06/17/08 09:20:37 Allocated 2 buffers, size 65536 bytes, total used: 131232
bengine: [3212] 06/17/08 09:20:37 HARDWARE COMPRESSION ===> Compression is configurable.
bengine: [3212] 06/17/08 09:20:37 GET_DRV_INF: bsize = 65536
 
Is there somewhere else I need to configure this?
 
 
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Ken_Putnam
Level 6

‎06-18-2008 09:22 AM

sounds like your data is not very compressible. 
 
2:1 compression is a Marketing hype, not an Engineering promise.  You will almost never see 2:1 in the real world.  I use about 1.2:1 or 1.3:1 as rule of thumb
 
 
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