Nicolas Williams writes: > On Thu, Oct 04, 2007 at 03:49:12PM +0200, Roch - PAE wrote: > > ...memory utilisation... OK so we should implement the 'lost cause' rfe. > > > > In all cases, ZFS must not steal pages from other memory consumers : > > > > 6488341 ZFS should avoiding growing the ARC into trouble > > > > So the DB memory pages should not be _contented_ for. > > What if your executable text, and pretty much everything lives on ZFS? > You don't want to content for the memory caching those things either. > It's not just the DB's memory you don't want to contend for.
On the read side, We're talking here about 1000 disks each running 35 concurrent I/Os of 8K, so a footprint of 250MB, to stage a ton of work. On the write side we do have to play with the transaction group so that will be 5-10 seconds worth of synchronous write activity. But how much memory does a 1000-disks server got ? -r _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
