Re: SMART detects pending sectors; take offline?

[Alexander Shenkin <al@shenkin.org>]

Thanks Carsten,

I was mistaken, it's a RAID1, not RAID0.  I have /boot mounted on a
RAID0, and / mounted on RAID5.  They both split across 4 drives.

Appreciate the advice - i'll just keep it running until the drive
arrives tomorrow...

Thanks,
Allie

On 10/7/2017 9:21 AM, Carsten Aulbert wrote:
> Hi
> 
> On 10/07/17 09:48, Alexander Shenkin wrote:
>> My SMART monitoring has picked up some pending sectors on one of my
>> RAID0 + RAID5 drives (it's one of the infamous 3TB seagate drives... my
>> other 3 failed earlier... this is the last of them, that finally has
>> gone as well...).  I've just ordered a replacement (Toshiba P300) that
>> will arrive tomorrow... but the question is, what to do in the meantime?
>>  Should I take the drive offline?  I suspect so, but would like to
>> double check before taking action.  Thanks in advance for any advice.
> 
> Given this is "only" a single sector error I would keep it running as
> long as you can physically install the new drive and only then take it
> offline.
> 
> At least theoretically, it may be possible to force the rewrite of this
> sector and use the spare sectors of the disk, but I'm not 100% sure if a
> simple md check would already trigger it - usually you need to write
> "new" data to defective sectors to force the drive's firmware to use the
> spare sectors.
> 
> But given the replacement disk should arrive soon, I would not act
> before that and run with a degraded RAID5 until then.
> 
> I'm a bit more worried about the RAID0 here, do you run RAID0 on top of
> RAID5 or what is the exact set-up?
> 
> cheers
> 
> Carsten
>