SMART diags (was: mismatch_cnt != 0, member content mismatch, but md says the mirror is good)

[Tom Buskey]

On Wed, Feb 24, 2010 at 10:03 PM, Benjamin Scott <dragonhawk at gmail.com>wrote:

> On Wed, Feb 24, 2010 at 8:08 AM, Tom Buskey <tom at buskey.name> wrote:
> > They found little difference between enterprise and consumer grade
> lifetimes.
>
>   That doesn't surprise me.  They're often the exact same hard disk
> assembly, just with different firmware, or maybe a different PCB.
> Despire marketing claims to the contrary, I wouldn't expect firmware
> tweaks to significantly improve reliability in most cases.  (*Most*.
> Reportedly, bad design in the firmware of IBM's DeskStar drives may
> have causes some of their problems back during the "DeathStar"
> plague.)
>

I hit a firmware problem migrating disks from an older to newer NetApps.
The old system bolted the drives in the case (hey, it was a 486, not hot
swap).  The new system used DEC StorageWorks and we had to put the drives in
plastic carriers.

Apparently, the drives could get into sync & harmonic motion with the new
setup.  We had 3-4 drive failures in one week.  The new drives had different
firmware that prevented this.  And NetApp no longer allowed you to put your
own drives in the carriers.
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