Re: Just in case it is of general interest: ZFS mirroring was the culprit in our case

2007-11-13 Thread David Carter
On Tue, 13 Nov 2007, Pascal Gienger wrote: Our latency problems went away like a miracle when we detached one half of the mirror (so it is no more a mirror). Read-Rates are doubled (not per device, the total read rate!), latency is cut off. No more latency problems. When attaching the

Re: Just in case it is of general interest: ZFS mirroring was the culprit in our case

2007-11-13 Thread Dale Ghent
Interesting. What's your kernel patch level? We're running on 125101-10 with the exact same configuration as you (mirrored to two arrays, in separate buildings even) and haven't seen this problem. /dale On Nov 13, 2007, at 1:23 AM, Pascal Gienger wrote: Our latency problems went away

Re: Just in case it is of general interest: ZFS mirroring was the culprit in our case

2007-11-13 Thread Rob Banz
...though, we have seen super-greedyness of ZFS when resilvering. ;) On Nov 13, 2007, at 09:17, Dale Ghent wrote: Interesting. What's your kernel patch level? We're running on 125101-10 with the exact same configuration as you (mirrored to two arrays, in separate buildings even) and

Re: Just in case it is of general interest: ZFS mirroring was the culprit in our case

2007-11-13 Thread Vincent Fox
Can you expand on this, like a LOT? I recall a while ago you brought up some performance issues and said you had found hacks for them. Were those issues actually unresolved or are you talking about something else? I don't see any recent posts by you about problems with your Cyrus install. I'm

Just in case it is of general interest: ZFS mirroring was the culprit in our case

2007-11-12 Thread Pascal Gienger
Our latency problems went away like a miracle when we detached one half of the mirror (so it is no more a mirror). Read-Rates are doubled (not per device, the total read rate!), latency is cut off. No more latency problems. When attaching the volume again, resilvering puts the system to a halt