Are you using compression or dedup on the FS? On Fri, Aug 24, 2012 at 12:58 AM, Jan Owoc <jso...@gmail.com> wrote:
> Hi, > > > On Thu, Aug 23, 2012 at 10:32 PM, Julius Roberts > <hooliowobb...@gmail.com> wrote: > > as per the subject, I'm getting very slow write performance on a 3 > > disk raidz1-0 zpool. IIRC the disks are early 1tb WD green drives. > > Not sure what i should tell you, but during copies of large 10gb+ > > files rsync is showing around 2MB/s, which is terribly poor i think. > > Sorry if this is a common question, not sure what to do. > > > > twsadmin@darling:~/mdbackup$ zpool iostat Backups 5 > > capacity operations bandwidth > > pool alloc free read write read write > > ---------- ----- ----- ----- ----- ----- ----- > > Backups 2.04T 694G 97 330 2.72M 1.95M > > Backups 2.04T 694G 170 248 3.98M 1019K > > How are you generating these writes? Are they maybe small files over a > wireless network? If so, what if you generated the I/O using: > dd if=/dev/zero of=/Backups/zero.file > > Is this behaviour new, or did you change anything recently? (Did you > really copy over all those GBs at 2MB/s?) I'm going to rule out > underpowered system, since even an Atom should be able to do sha256 > checksums and parity calculations faster than 2 MB/s. > > > > twsadmin@darling:~/mdbackup$ zpool status > > pool: Backups > > state: ONLINE > > scan: scrub repaired 0 in 12h56m with 0 errors on Sat Aug 18 20:56:44 > 2012 > > config: > > > > NAME STATE READ WRITE CKSUM > > Backups ONLINE 0 0 0 > > raidz1-0 ONLINE 0 0 0 > > c3t0d0 ONLINE 0 0 0 > > c3t1d0 ONLINE 0 0 0 > > c4t1d0 ONLINE 0 0 0 > > This looks fine. Reading 2TB in 13h is about 45 MB/s, so about the > order of magnitude we'd expect. > > > Jan > > _______________________________________________ > OpenIndiana-discuss mailing list > OpenIndiana-discuss@openindiana.org > http://openindiana.org/mailman/listinfo/openindiana-discuss > -- Seconds to the drop, but it seems like hours. http://www.openmedia.ca https://robbiecrash.me _______________________________________________ OpenIndiana-discuss mailing list OpenIndiana-discuss@openindiana.org http://openindiana.org/mailman/listinfo/openindiana-discuss
