> > Have I missed any changes/updates in the situation? > > I'm been getting very bad performance out of a LSI 9211-4i card > (mpt_sas) with Seagate Constellation 2TB SAS disks, SM SC846E1 and > Intel X-25E/M SSDs. Long story short, I/O will hang for over 1 minute > at random under heavy load.
Hm. That I haven't seen. Is this hang as in some drive hangs up with iostat busy% at 100 and nothing else happening (can't talk to a disk) or a hang as perceived by applications under load? What's your read/write mix, and what are you using for CPU/mem? How many drives? I wonder if maybe your SSDs are flooding the channel. I have a (many) 847E2 chassis, and I'm considering putting in a second pair of controllers and splitting the drives front/back so it's 24/12 vs all 36 on one pair. > Swapping the 9211-4i for a MegaRAID 8888ELP (mega_sas) improves > performance by 30-40% instantly and there are no hangs anymore so I'm > guessing it's something related to the mpt_sas driver. Well, I sorta hate to swap out all of my controllers (bother, not to mention the cost) but it'd be nice to have raidutil/lsiutil back. _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
