[OmniOS-discuss] How bad are these controller / io errors??

[steve at linuxsuite.org]

>>     Thanks Richard...
>>
>>     There are 11 Seagate 3T SATA drives on a single backplane.  10
>> in a RAIDZ-2 and a hot spare. There are no other devices in the JBOD.
>> ZIL is on a separate SSD in a DELL chassis
>>
>>     So a couple of questions
>>
>>    i) If there is a single device that has a "large" number of errors
>>        compared to the other devices, then perhaps this device is
>>       messing up the others? So swapping it out could solve the problem?
>
> In my experience, no. The exact errors and their timeline matters.
> Coincidently, I am looking at methods to approach this problem :-)
> I'll contact you off-alias for details.
>
>>
>>   ii) If I had the SATA devices behind SATA port multipliers, will I
>>       have the same issues? ie. a single bad device will mess up the
>> others?
>
> Port multipliers are evil, I avoid them at all costs.
>
> The successful solutions I have seen work are, in no particular order:
> 	1. pay the extra $10 and get the SAS version of the disk
> 	2. pay $30 and get a SAS-SATA interposer, hopefully your carrier can
> accommodate
> 	3. go direct, get a backplane without an expander (eg Supermicro TQ
> series)
>

       Hahah, you jokin right??  You know were to get 3T/4T SAS disks
that are only  $10 more than the SATA version???  Everywhere
I look SAS is around twice the price?? Nearline is same. If I could
get SAS for $10 more I would be in Storage Heaven.

      thanx very much   - steve


>  -- richard
>
>>
>>   iii) Does OmniOS even support SATA HBA connected to SATA port
>> multipliers?
>>
>>      Perhaps tracking errors on devices will allow for preventative
>> action...
>>
>>     thanx - steve
>>
>>>
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>>> ZFS storage and performance consulting at http://www.RichardElling.com
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>
> --
>
> Richard.Elling at RichardElling.com
> +1-760-896-4422
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