On 07/10/12 09:25 PM, Jordi Espasa Clofent wrote:
Hi all,
By default I'm using ZFS for all the zones:
admjoresp@cyd-caszonesrv-15:~$ zfs list
NAME USED AVAIL REFER MOUNTPOINT
opt 4.77G 45.9G 285M /opt
opt/zones 4.49G 45.9G 29K /opt/zones
opt/zones/glad-gm02-ftcl01 367M 45.9G 367M /opt/zones/glad-gm02-ftcl01
opt/zones/glad-gp02-ftcl01 502M 45.9G 502M /opt/zones/glad-gp02-ftcl01
opt/zones/glad-gp02-ftcl02 1.21G 45.9G 1.21G /opt/zones/glad-gp02-ftcl02
opt/zones/mbd-tcasino-02 257M 45.9G 257M /opt/zones/mbd-tcasino-02
opt/zones/mbd-tcasino-04 281M 45.9G 281M /opt/zones/mbd-tcasino-04
opt/zones/mbfd-gp02-ftcl01 501M 45.9G 501M /opt/zones/mbfd-gp02-ftcl01
opt/zones/mbfd-gp02-ftcl02 475M 45.9G 475M /opt/zones/mbfd-gp02-ftcl02
opt/zones/mbhd-gp02-ftcl01 475M 45.9G 475M /opt/zones/mbhd-gp02-ftcl01
opt/zones/mbhd-gp02-ftcl02 507M 45.9G 507M /opt/zones/mbhd-gp02-ftcl02
However, I have the compression disabled in all of them.
According to this Oracle whitepaper
http://www.oracle.com/technetwork/server-storage/solaris10/solaris-zfs-in-containers-wp-167903.pdf:
"The next example demonstrates the compression property. If compression
is enabled, Oracle Solaris ZFS will transparently compress all of the
data before it is written to disk. The benefits of compression
are both saved disk space and possible write speed improvements."
What exactly means "POSSIBLE" write speed improvements?
With compression enabled, less data has to be written to disk, so N
bytes writes in N/compress ratio time.
On most systems, the performance cost of compressing and uncompressing
data is relatively low.
As you can see above I don't use to have any room problems, so if I'm
going to enable the compression flag it has to be because of the write
speed improvements.
I always enable compression by default and only turn it off for
filesystems I know hold un-compressible data such as media files.
--
Ian.
_______________________________________________
zfs-discuss mailing list
zfs-discuss@opensolaris.org
http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
