Date: Mon, 12 Nov 2012 09:18:41 -0000 From: "Steven Hartland" <killing@multiplay.co.uk> To: "Daniel Kalchev" <daniel@digsys.bg>, "Freddie Cash" <fjwcash@gmail.com> Cc: freebsd-fs@freebsd.org Subject: Re: ZFS HBAs + LSI chip sets (Was: ZFS hang (system #2)) Message-ID: <6E97CF2618534750AE82D23332C6CADC@multiplay.co.uk> References: <1350698905.86715.33.camel@btw.pki2.com> <1350711509.86715.59.camel@btw.pki2.com> <50825598.3070505@FreeBSD.org> <1350744349.88577.10.camel@btw.pki2.com> <1350765093.86715.69.camel@btw.pki2.com> <508322EC.4080700@FreeBSD.org> <1350778257.86715.106.camel@btw.pki2.com> <CAOjFWZ7G%2BaLPiPQTaUOE5oJY3So0cWYKvU86y4BZ2MQL%2BbqGMA@mail.gmail.com> <5084F6D5.5080400@digsys.bg> <CAOjFWZ4FX2TrZ9Ns_uJ19=gXRxRqig3XQKV8Dz1bg-EqEHte_A@mail.gmail.com> <50A0ADDA.9040205@digsys.bg>
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----- Original Message -----
From: "Daniel Kalchev" <daniel@digsys.bg>
> As weird as it sounds, I discovered that my SSD-only zpool (raidz1) was
> using ashift=9. So, changed to ashift=12 and not seen disconnects
> anymore for a week now. Is 4k good for these SSDs? Or 8k is better, or
> larger?
>
> It seems it's really an SSD firmware problem, as the SSDs are likely
> doing more work when used with 512b sectors and from time to time fail
> to communicate properly with the bus. The SSDs are OCZ-VERTEX4 (firmware
> 1.5).
>
> Sometimes it seems to be drive related problem and perhaps the mps
> driver/hardware is too sensitive to drive issues.
I don't know any SSD or drives for that matter using larger than 4k sectors.
Could you post the output from:-
camcontrol identify <device>
I've got a list of other 4k drives to add quirks for so might as well
include this one while I'm at it :)
Regards
Steve
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