How to force the use of compression

[Baumann Tamás]

Dear All,

Does anyone have any experience on how to force the use of compression? We use Dataprotector and I emulate any manufacturer's device but the hardware compression checkbox is unchecked. I would like to replace an EMC DD VTL, which also does not allow this option to be checked, but compression works regardless. unfortunately the Quadsror documentation does not mention this. This is a very important issue. Because with 5-6 times compression you can save a lot of money when buying storage.

Thank you very much,

KR

Thomas

[QUADStor VTL Support]

Hi,

Are you not able to change the hardware compression checkbox ? By default the drive starts with compression enabled and is only changed by the host. The host sends a SCSI MODE SELECT command to select or deselect the compression property. When the hardware compression checkbox is unselected at the backup application side, the application assumes that the data needs to be written to media uncompressed. So it will send a SCSI MODE SELECT command to disable compression on the drive. If the hardware compression is checked, then the application will send a SCSI MODE SELECT command to enable compression on the drive.

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