Re: [zfs-discuss] Sudden drop in disk performance - WD20EURS & 4k sectors to blame?

2011-08-16 Thread krad
On 15 August 2011 15:55, Andrew Gabriel wrote: > David Wragg wrote: > >> I've not done anything different this time from when I created the >> original (512b) pool. How would I check ashift? >> >> > > For a zpool called "export"... > > # zdb export | grep ashift > ashift: 12 > ^C > # > > As far

Re: [zfs-discuss] Sudden drop in disk performance - WD20EURS & 4k sectors to blame?

2011-08-15 Thread Andrew Gabriel
David Wragg wrote: I've not done anything different this time from when I created the original (512b) pool. How would I check ashift? For a zpool called "export"... # zdb export | grep ashift ashift: 12 ^C # As far as I know (although I don't have any WD's), all the current 4k sectorsiz

Re: [zfs-discuss] Sudden drop in disk performance - WD20EURS & 4k sectors to blame?

2011-08-15 Thread David Wragg
I've not done anything different this time from when I created the original (512b) pool. How would I check ashift? -- This message posted from opensolaris.org ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/

Re: [zfs-discuss] Sudden drop in disk performance - WD20EURS & 4k sectors to blame?

2011-08-15 Thread chris scott
Did you 4k align your partition table and is ashift=12? -- This message posted from opensolaris.org ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss

[zfs-discuss] Sudden drop in disk performance - WD20EURS & 4k sectors to blame?

2011-08-15 Thread David Wragg
Hi all, first post to this mailing list so please forgive me if I miss something obvious. Earlier this year I went over 80% disk utilisation on my home server and saw performance start to degrade. I migrated from the old pool of 4 x 1TB WD RE2-GPs (raidz1) to a new pool made of 6 x 2TB WD EURS (