You mentioned that the pool was somewhat full, can you send the output of 'zpool iostat -v pool0'? You can also try doing the following to reduce 'metaslab_min_alloc_size' to 4K:
echo "metaslab_min_alloc_size/Z 1000" | mdb -kw NOTE: This will change the running system so you may want to make this change during off-peak hours. Then check your performance and see if it makes a difference. - George On Mon, May 16, 2011 at 10:58 AM, Donald Stahl <d...@blacksun.org> wrote: > Here is another example of the performance problems I am seeing: > > ~# dd if=/dev/zero of=/pool0/ds.test bs=1024k count=2000 2000+0 records in > 2000+0 records out > 2097152000 bytes (2.1 GB) copied, 56.2184 s, 37.3 MB/s > > 37MB/s seems like some sort of bad joke for all these disks. I can > write the same amount of data to a set of 6 SAS disks on a Dell > PERC6/i at a rate of 160MB/s and those disks are hosting 25 vm's and a > lot more IOPS than this box. > > zpool iostat during the same time shows: > pool0 14.2T 25.3T 124 1.30K 981K 4.02M > pool0 14.2T 25.3T 277 914 2.16M 23.2M > pool0 14.2T 25.3T 65 4.03K 526K 90.2M > pool0 14.2T 25.3T 18 1.76K 136K 6.81M > pool0 14.2T 25.3T 460 5.55K 3.60M 111M > pool0 14.2T 25.3T 160 0 1.24M 0 > pool0 14.2T 25.3T 182 2.34K 1.41M 33.3M > > The zero's and other low numbers don't make any sense. And as I > mentioned- the busy percent and service times of these disks are never > abnormally high- especially when compared to the much smaller, better > performing pool I have. > -- George Wilson M: +1.770.853.8523 F: +1.650.494.1676 275 Middlefield Road, Suite 50 Menlo Park, CA 94025 http://www.delphix.com _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
