[OpenIndiana-discuss] Useful tidbit for ZFS backup via ZFS Send

Roel_D openindiana at out-side.nl
Sat Sep 29 14:17:44 UTC 2012

How did you modify the make-file? Is there a general howto for this alter action? 

Kind regards, 

The out-side

Op 29 sep. 2012 om 15:46 heeft Bryan N Iotti <ironsides.medvet at gmail.com> het volgende geschreven:

> Hi all,
> thought you'd like to know the following...
> I have my rpool on a 146GB SCSI 15K rpm disk.
> I regularly back it up with the following sequence of commands:
> - zfs snapshot -r rpool@<DATE>
> - cd to backup dir and su
> - zfs send -R rpool@<DATE> | gzip > rpool.COMPLETE.<DATE>.gz
> ... as per Oracle manual.
> I was wondering why it was so slow, taking a couple of hours, then I payed attention to my CPU meter and understood that the normal gzip was running as a single thread.
> I searched online for a multithreaded version and came across pigz (http://www.zlib.net/pigz/). I downloaded it, modified the Makefile to use the Solaris Studio 12.3 cc with the proper CFLAGS ("-fast", for now, no -m64). I then copied both pigz and unpigz to a directory in my PATH and modified the last command to:
> - zfs send -R rpool@<DATE> | /usr/local/bin/pigz > rpool.COMPLETE.<DATE>.gz
> Now backups are compressed using multiple threads and the process takes about a quarter of the time.
> Pigz apparently splits the input into blocks of a user definable size (128kb being the default) and allows for parallel compression, using all available threads (or less, with the user -p #threads option).
> Hope this helps some of you. Would be nice to have in the pkg repo.
> Bryan
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