On Tue, 27 Sep 2011, Edward Ned Harvey wrote:

The problem basically applies to HDD's.  By creating your pool of SSD's,
this problem should be eliminated.

This is not completely true. SSDs will help significantly but they will still suffer from the synchronized commit of a transaction group. SSDs don't suffer from seek time, but they still suffer from erase/write time and many SSDs are capable of only a few thousand flushed writes per second. It is just a matter of degree.

SSDs which do garbage collection during the write cycle could cause the whole vdev to temporarily hang until the last SSD has committed its write.

Bob Friesenhahn
bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/
zfs-discuss mailing list

Reply via email to