[OmniOS-discuss] Disappearing drives?

[Richard Elling]

On Feb 14, 2014, at 8:29 AM, Dan Swartzendruber <dswartz at druber.com> wrote:

> 
> I've been running an install on r151008.  rpool mirrored on two WD black
> 160GB sata drives.  8 SAS nearline drives in a raid10.  Two samsung 840PRO
> 128GB drives as l2arc.  The sas and l2arc drives are on an LSI HBA, and
> the rpool on motherboard sata ports.  Twice now, I've had drives disappear
> - the first time was one of the rpool drives, and yesterday one of the
> l2arc drives.  The symptom is that zpool status shows thousands of
> read/write errors and the drive is offlined.  If I run the format command,
> it shows that drive as 'unknown drive type'.  I apologize for not getting
> more specific data - the first time, I wrote off as an anomaly, but
> yesterday I really should have cut&pasted anything relevant.  Anyway, I'm
> puzzled that there seems no common hardware or driver factor.  The rpool
> drives are sata, and are using the sata-phy driver (I think that's what I
> dug out of prtconf -v), whereas, although the l2arc drives are sata, since
> they are on the lsi hba, they are using the sas-mpt driver.  I wasn't that
> concerned about yesterday's incident, since l2arc drives could both die
> suddenly and not take things down, but having rpool go bye-bye is not good
> - this is why I was paranoid and mirrored it.  Any ideas?  If this happens
> again, what should I look for?

“fmadm faulty” and "fmdump -eV” sheds a lot of light on these sorts of problems.
 — richard

-- 

ZFS storage and performance consulting at http://www.RichardElling.com