22.8 Using NSS Commands to Configure and Monitor Compression

NSS offers the following commands for configuring and monitoring compression. Issue the commands at the NSS Console (nsscon) as the root user.

Table 22-5 Compression Management Commands



nss /Compression=volume_name 

Enables the Compression attribute for the specified volume.

nss /Compression=all

Enables the Compression attribute for all volumes on the server.

nss /StopNormalCompression

Stops all queued compression for files, based on the compression triggered by a file open or close.

nss /BGCompression

Allows compression to occur in the background at any time, instead of only within specified hours.

nss /NoBGCompression

Stops background compression and clears all the enqueued background compression request. Allows compression to occur only within the specified hours.

nss /CompressionDailyCheckStartingHour 

Starts scanning each enabled volume for files that need to be compressed at the specified hour (Range = 0 - 23, where 0=midnight, 23=11p.m).

nss /CompressionDailyCheckStopHour

Ends scanning each enabled volume for files that need to be compressed at the specified hour (Range = 0-23, where 0=midnight, 23=11p.m).

NOTE:If CompressionDailyCheckStopHour is equal to CompressionDailyStartingHour then the start checking every day at CompressionDailyStartingHour and run as long as necessary to finish all files meeting the compressible criteria. [Value=6, Range=0-23].

nss /DaysUntouchedBeforeCompression

The number of days to wait after a file was last accessed before automatically compressing it. [Value=14, Range=0-100000].

nss /DeletedFilesCompressionOption

Options to compress the deleted files. 0 = do not compress the files, 1= compress next day, 2=compress immediately. [Value=1, Range=0-2].

nss /(No)EnableFileCompression

Allows file compression to occur on compression enabled volumes. If disabled, the compression does not happen. Immediate compress requests are queued until compression is allowed. [Value=ON].

nss /MaximumConcurrentCompressions

Maximum number of simultaneous compressions allowed by the system (simultaneous compressions can only occur if there are multiple volumes). [Value=2, Range=1-8].

nss /MinimumCompressionPercentageGain

Minimum percentage a file must compress in order to remain compressed. [Value=20 Range=0-50]