HP LTO - How to set hardware compression off/on at the drive level.
Last updated on MAY 19, 2017
Applies to:HP LTO5 Tape Drive - Version All Versions and later
HP LTO6 Tape Drive - Version All Versions and later
HP LTO4 Tape Drive - Version All Versions and later
HP LTO3 Tape Drive - Version All Versions and later
Information in this document applies to any platform.
LT and T
Certain user applications (specifically HP Data Protector) specify that compression should be switched off at the drive level. By default the drive has compression switched "on" although the drive will detect whether the data incoming is compressed or not and if it is, it will not compress further.
To quote HP....
"The data compression hardware in HP Ultrium drives can detect whether incoming data is already compressed and will not attempt to compress it again. The drive can switch dynamically and automatically between compressing and non-compressing modes, thereby optimizing both compression ratio performance and data rate. As this mode of behavior is embedded in the Ultrium format, there is no need for host application software to switch the drive’s data compression on and off and HP strongly recommends to leave data compression at its default of 1 (on)."
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