On Mar 13, 2010, at 4:54 AM, Tonmaus wrote: > Dear zfs fellows, > > during a specific test I have got the impression that scrub may have quite an > impact on other I/O. CIFS throughput is down to 7 MB/s from 100 MB/s while > scrub on my main NAS. That is not a surprise as scrub of my raidz2 pool maxes > out CPU on that machine. (1 Xeon L5410). > I am running scrubs during week-ends, so this is not a problem. I am asking > myself however what will happen on larger pools where a scrub pass will take > days to weeks. Obviously, zfs file systems are much more scalable than CPU > power ever will be. > Hence, I am seeing a requirement to manage scrub activity so that trade-offs > can be done to maintain availability and performance of the pool. Does > anybody know how this is done?
This is noticeable on systems with slow disks and is worse on releases prior to b129 or so. Can you describe your hardware and release? -- richard ZFS storage and performance consulting at http://www.RichardElling.com ZFS training on deduplication, NexentaStor, and NAS performance Atlanta, March 16-18, 2010 http://nexenta-atlanta.eventbrite.com Las Vegas, April 29-30, 2010 http://nexenta-vegas.eventbrite.com _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
