skiplist_unsafe

[Janne Peltonen]

> I enabled it a few weeks ago before I left UMBC, and it certainly  
> seemed to help write performance on the ZFS pool -- we started seeing  
> the larger batched writes on those devices, instead of a constant  
> stream of itty bity IOs caused by the constant fsync'ing.
> 
> If you feel that your filesystem/buffercache will do a good job at  
> writing things out to disk, and you've got battery-backed cache on  
> your storage, you should be relatively well off.

But if I were to turn skiplist_unsafe on, and the OS crashed - or, say,
the cluster system forcibly unmounted my Cyrus spool and config
filesystems - wouldn't that result in horribly unrecoverable databases
all over the place? (I have everything in skiplist, except quota and
subscriptions.)


--Janne
-- 
Janne Peltonen <janne.peltonen at helsinki.fi>