On Thu, May 20, 2010 at 1:51 PM, Asif Iqbal <vad...@gmail.com> wrote: > I have a T2000 with a dual port 4gb hba (QLE2462) and a 3510FC with > one controller 2gb/s attached to it. > I am running sol 10 u3 . > > every time I change the recordsize of the zfs fs the disk IO improves > (doubles) and stay like that for > about 5 to 6 hrs. Then it dies down. I increase the recordsize again > and performace jumps back to > double again. The main app is oracle database with 8K blocksize > > I changed the zfs recordsize to from 8K to 16K and then 32K every 8 > hrs, which improved the disk IO > > I wonder if there is any other zfs parameter that I can change to keep > the performance good, since I > am running older sol 10. > > I have single disk luns on the 3510 with mpxio enabled on T2000. each > disk has two paths (primary,primary) > online per luxadm. > > zpool iostat 10 gives me only about 6MB max write bandwidth. I was > hoping it to lot higher. > > the battery on 3510 is expired and waiting for a replacement. > > besides replacing the battery, what else can I do to improve the write > bandwidth? > > does the battery expire directly affecting the oracle's disk IO? I > thought oracle will just write to zfs and done. > and zpool will then write-through to controller instead of write-back > since no battery. > > sun storage guys found no other issue besides the battery. > > should disabling zil improve performance? I won't try it until we get > the battery so not to risk data loss > during outage.
so my 3510 is essentially behaving like a 3510 jbod but why would that make the IO bandwidth this low? here are some iodata which make the t2000/3510 setup looks even worse http://pastebin.com/QeAKDbfj > > -- > Asif Iqbal > PGP Key: 0xE62693C5 KeyServer: pgp.mit.edu > A: Because it messes up the order in which people normally read text. > Q: Why is top-posting such a bad thing? > -- Asif Iqbal PGP Key: 0xE62693C5 KeyServer: pgp.mit.edu A: Because it messes up the order in which people normally read text. Q: Why is top-posting such a bad thing? _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
