Re: [zfs-discuss] Recommendation for home NAS external JBOD

2012-06-20 Thread Richard Elling
On Jun 20, 2012, at 5:08 PM, Jim Klimov wrote: > 2012-06-21 1:58, Richard Elling wrote: >> On Jun 20, 2012, at 4:08 AM, Jim Klimov wrote: >>> >>> Also by default if you don't give the whole drive to ZFS, its cache >>> may be disabled upon pool import and you may have to reenable it > >> The behav

Re: [zfs-discuss] Recommendation for home NAS external JBOD

2012-06-20 Thread Jim Klimov
2012-06-21 1:58, Richard Elling wrote: On Jun 20, 2012, at 4:08 AM, Jim Klimov wrote: Also by default if you don't give the whole drive to ZFS, its cache may be disabled upon pool import and you may have to reenable it The behaviour is to attempt to enable the disk's write cache if ZFS has t

Re: [zfs-discuss] Recommendation for home NAS external JBOD

2012-06-20 Thread Richard Elling
On Jun 20, 2012, at 4:08 AM, Jim Klimov wrote: > > Also by default if you don't give the whole drive to ZFS, its cache > may be disabled upon pool import and you may have to reenable it > manually (if you only actively use this disk for one or more ZFS > pools - which play with caching nicely). T

Re: [zfs-discuss] Recommendation for home NAS external JBOD

2012-06-20 Thread Jim Klimov
2012-06-20 0:32, Timothy Coalson wrote: when it has 4k sectors, then in theory if "First sector" is a multiple of 8, it is aligned, but it will probably issue writes of size 512 which will degrade performance anyway). I think this is dependent on the firmware (vendor), and queued writes into th