On 2013-11-04, John R Pierce <pierce@xxxxxxxxxxxx> wrote:
> On 11/4/2013 9:30 AM, Les Mikesell wrote:
>>> Besides, if you have a problem with a truly humongous RAID, the rebuild
>>> >will finish sometime around next summer....
>> Yes, I'd probably use a RAID10 style RAID so it runs at full speed
>> even with a drive out of the array so you can put off the rebuild
>> until a weekend. A rebuild will keep the heads too busy to do a lot
>> of other work while it is running.
>
>
> Using a common LSI Logic Megaraid card (9260-8i, I think, but don't
> quote me), and 11 by 3TB raid6 with hotspares (using Seagate
> Constellation.ES2 SAS2 drives), single drive failure rebuilds took 24
> hours, double drive failures took 36 hours, this with the system online
> but mostly idle the whole time. yes, if you have steady user IO
> activity going on the rebuild would take quite a bit longer, as it only
> proceeds when the disks are idle.
The MegaRAID controllers have a configurable rebuild rate. The default
is 30%, but you can increase it up to 100% (which will probably kill
your system IO). LSI 3ware controllers are also configurable in a
similar way (their scale is only 1..5).
--keith
--
kkeller@xxxxxxxxxxxxxxxxxxxxxxxxxx
_______________________________________________
CentOS mailing list
CentOS@xxxxxxxxxx
http://lists.centos.org/mailman/listinfo/centos
