All,

We have been experimenting with pigz (a parallel version of gzip which
exploits multiple cores) to try and reduce the amount of time taken
when backing up DLEs using software compression (gzip). We've had
encouraging results, with the backup taking roughly half the time.

Unfortunately, the performance boost is cold comfort when you are
unable to restore from such a backup:

1234812125.268356: amidxtaped: tape:   files[402] = 403
1234812125.268369: amidxtaped: tape:   files[403] = 404
1234812125.268383: amidxtaped: current tapefile_idx = 0
1234812129.843354: amidxtaped: Device /dev/IBMtape1n error = 'EOF'

pigz: stdin: invalid compressed data--format violated
Error writing fd 5: Broken pipe
Error writing fd 5: Broken pipe

Has anybody had any experience of trying to use mgzip, pigz, or
similar parallel bzip compression?

Thanks,

-- 
-Jamie L. Penman-Smithson <jpenman.smithson AT gmail DOT com>