On 01/04/2011 16:37, Marat N.Afanasyev wrote:
to ensure consistency you should turn off physical drive caches, and degrade performance significantly, sometimes up to 1000x. if this is what you want, you may use either zfs or sync ufs. in such case you may be almost sure that your filesystems are consistent. but if you use drive's cache, then without UPS you will face data loss and vanished filesystem earlier or later
I'm not sure the performance loss is so severe with modern drives (attached to a decent controller). If they do tagged queuing (NCQ/TCQ) I think a lot of the performance lost through disabling the write cache can be regained through the queueing system.
-- Bruce Cran
