Re: [zfs-discuss] Can the ZFS "copies" attribute substitute HW disk redundancy?

2012-08-02 Thread Nigel W
On Thu, Aug 2, 2012 at 3:39 PM, Richard Elling wrote: > On Aug 1, 2012, at 8:30 AM, Nigel W wrote: > > > Yes. +1 > > The L2ARC as is it currently implemented is not terribly useful for > storing the DDT in anyway because each DDT entry is 376 bytes but the > L2ARC referen

Re: [zfs-discuss] Can the ZFS "copies" attribute substitute HW disk redundancy?

2012-08-01 Thread Nigel W
On Wed, Aug 1, 2012 at 8:33 AM, Sašo Kiselkov wrote: > On 08/01/2012 04:14 PM, Jim Klimov wrote: >> chances are that >> some blocks of userdata might be more popular than a DDT block and >> would push it out of L2ARC as well... > > Which is why I plan on investigating implementing some tunable pol

Re: [zfs-discuss] encfs on top of zfs

2012-07-31 Thread Nigel W
On Tue, Jul 31, 2012 at 9:36 AM, Ray Arachelian wrote: > On 07/31/2012 09:46 AM, opensolarisisdeadlongliveopensolaris wrote: >> Dedup: First of all, I don't recommend using dedup under any >> circumstance. Not that it's unstable or anything, just that the >> performance is so horrible, it's never

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

2012-06-18 Thread Nigel W
On Mon, Jun 18, 2012 at 5:26 PM, Carson Gaspar wrote: > What makes you think the Barracuda 7200.14 drives report 4k sectors? I gave > up looking for 4kn drives, as everything I could find was 512e. I would > _love_ to be wrong, as I have 8 4TB Hitachis on backorder that I would > gladly replace wi

Re: [zfs-discuss] Advanced Format HDD's - are we there yet? (or - how to buy a drive that won't be teh sux0rs on zfs)

2012-05-28 Thread Nigel W
On Mon, May 28, 2012 at 6:13 PM, Daniel Carosone wrote: > On Mon, May 28, 2012 at 09:23:25AM -0600, Nigel W wrote: >> After a snafu >> last week at $work where a 512 byte pool would not resilver with a 4K >> drive plugged in, it appears that (keep in mind that these a

Re: [zfs-discuss] Advanced Format HDD's - are we there yet? (or - how to buy a drive that won't be teh sux0rs on zfs)

2012-05-28 Thread Nigel W
On Mon, May 28, 2012 at 6:48 AM, Nathan Kroenert wrote: > Anyone offer up suggestions of either 3 or preferably 4TB drives that > actually work well with ZFS out of the box? (And not perform like > rubbish)... With our NCP 3 boxes the WD drives seem to be working okay (this is with consumer level

Re: [zfs-discuss] Scrub found error in metadata:0x0, is that always fatal? No checks um errors now...

2011-12-08 Thread Nigel W
On Mon, Dec 5, 2011 at 17:46, Jim Klimov wrote: > So, in contrast with Nigel's optimistic theory that > metadata is anyway extra-redundant and should be > easily fixable, it seems that I do still have the > problem. It does not show itself in practice as of > yet, but is found by scrub ;) Hmm. In

Re: [zfs-discuss] Scrub found error in metadata:0x0, is that always fatal? No checks um errors now...

2011-12-02 Thread Nigel W
On Fri, Dec 2, 2011 at 02:58, Jim Klimov wrote: > My question still stands: is it possible to recover > from this error or somehow safely ignore it? ;) > I mean, without backing up data and recreating the > pool? > > If the problem is in metadata but presumably the > pool still works, then this pa