Compression after vaulting
Amit Karia
November 9th, 2009
Environment
master server HP UX 11.23
netbackup version 6.5.4
We have recently implemeted VTL. and vaulting to duplicate images on tape..When data is written in VTL it is compressed(i.e. compression is enabled on VTL).. so when we are duplicating data on tape..it should be compressed too(if i am not mistaken).. what we have found is.. vault is not compressing to its full capacity..the same tapes which used to be full after 900GB when data was written directly to them..are not getting full around 600GB.. is there any work -around..
compression on tape
Hi Amit,
NetBackup has very little control over tape hardware compression. NetBackup simply writes blocks to the device and the device, in turn, performs it's hardware compression before the data is physically written to media.
During a read, the device does the reverse. It reads the compressed data from the media, decompresses it, and fills the buffers. At which point NetBackup reads the decompressed data from the buffers.
You will have to refer to HP's documentation on how to change the compression of the tape hardware.
Sorry about that,
Luc.
Thanks luc .. I will get in
Thanks luc ..
I will get in touch with vendor..
Would you like to reply?
Login or Register to post your comment.