ZFS HBAs + LSI chip sets (Was: ZFS hang (system #2))

[Steven Hartland]

----- Original Message ----- 
From: "Daniel Kalchev" <daniel at 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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