Re: [zfs-discuss] very slow write performance on 151a

2012-02-07 Thread Deepak Honnalli
Hi Milosz, As far as I know, fix for space map thrashing is in the works. As of now, you still have to do with the above mentioned tunables. Thanks, Deepak. On 02/ 1/12 11:20 PM, milosz wrote: hi guys, does anyone know if a fix for this (space map thrashing) is in the works? i've

Re: [zfs-discuss] very slow write performance on 151a

2012-02-01 Thread milosz
hi guys, does anyone know if a fix for this (space map thrashing) is in the works? i've been running into this on and off on a number of systems i manage. sometimes i can delete snapshots and things go back to normal, sometimes the only thing that works is enabling metaslab_debug. obviously the

Re: [zfs-discuss] very slow write performance on 151a

2011-12-19 Thread Jim Klimov
2011-12-15 22:44, milosz цкщеу: There are a few metaslab-related tunables that can be tweaked as well. - Bill For the sake of completeness, here are the relevant lines I have in /etc/system: ** * fix up metaslab min size (recent default ~10Mb seems b

Re: [zfs-discuss] very slow write performance on 151a

2011-12-15 Thread milosz
thanks, bill. i killed an old filesystem. also forgot about arc_meta_limit. kicked it up to 4gb from 2gb. things are back to normal. On Thu, Dec 15, 2011 at 1:06 PM, Bill Sommerfeld wrote: > On 12/15/11 09:35, milosz wrote: >> >> hi all, >> >> suddenly ran into a very odd issue with a 151a se

[zfs-discuss] very slow write performance on 151a

2011-12-15 Thread milosz
hi all, suddenly ran into a very odd issue with a 151a server used primarily for cifs... out of (seemingly) nowhere, writes are incredibly slow, often <10kb/s. this is what zpool iostat 1 looks like when i copy a big file: storepool 13.4T 1.07T 57 0 6.13M 0 storepool 13.4T 1