[zfs] vfs.zfs.cache_flush_disable and data integrity

C

cepa

n00b
Joined
Jul 18, 2012
Messages
12
Hello,

today I started to play with turning off cashe flush (vfs.zfs.cache_flush_disable=1) on my freenas box. I was quite dissapointed with the performance of six drives in stripe-mirror exported to a NFS share without separate zil.
Currently the cache_flush_disable option is turned on and the performance of random io under heavy load generated by multiple virtual machines is significantly higher however I cought more "odd things" than usual.
Java working in a virtual machine crashes more frequently and had a problem with some missing library objects in another one. Anyways, is it possible that cache_flush_disable affects data integrity of running virtual machines?

thx for any feedback
 
ok, false alarm, it seems that messing with NFS settings when another system is connected is a bad idea, problems gone after reboot ;)

btw, I have heard that having cache_flush_disabled turned on is a risky idea, does anyone have any expierience with this setting in production?
 
You must log in or register to reply here.
Back
Top