Re: [zfs-discuss] ARC de-allocation with large ram

2012-10-22 Thread Robert Milkowski
- From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss- boun...@opensolaris.org] On Behalf Of Chris Nagele Sent: 20 October 2012 18:47 To: zfs-discuss@opensolaris.org Subject: [zfs-discuss] ARC de-allocation with large ram Hi. We're running OmniOS as a ZFS storage server. For some

Re: [zfs-discuss] ARC de-allocation with large ram

2012-10-22 Thread Tomas Forsman
On 22 October, 2012 - Robert Milkowski sent me these 3,6K bytes: Hi, If after it decreases in size it stays there it might be similar to: 7111576 arc shrinks in the absence of memory pressure Also, see document: ZFS ARC can shrink down without memory pressure result in

Re: [zfs-discuss] ARC de-allocation with large ram

2012-10-22 Thread Chris Nagele
If after it decreases in size it stays there it might be similar to: 7111576 arc shrinks in the absence of memory pressure After it dropped, it did build back up. Today is the first day that these servers are working under real production load and it is looking much better. arcstat is

Re: [zfs-discuss] ARC de-allocation with large ram

2012-10-22 Thread Richard Elling
On Oct 22, 2012, at 6:52 AM, Chris Nagele nag...@wildbit.com wrote: If after it decreases in size it stays there it might be similar to: 7111576 arc shrinks in the absence of memory pressure After it dropped, it did build back up. Today is the first day that these servers are

[zfs-discuss] ARC de-allocation with large ram

2012-10-20 Thread Chris Nagele
Hi. We're running OmniOS as a ZFS storage server. For some reason, our arc cache will grow to a certain point, then suddenly drops. I used arcstat to catch it in action, but I was not able to capture what else was going on in the system at the time. I'll do that next. read hits miss hit%