[CentOS] Slow RAID Check/high %iowait during check after updgrade from CentOS 6.5 -> CentOS 7.2

Kelly Lesperance wrote:
> LSI/Avago’s web pages don’t have any downloads for the SAS2308, so I think
> I’m out of luck wrt MegaRAID.
>
> Bounced the node, confirmed MPT Firmware 15.10.09.00-IT.
> HP Driver is v 15.10.04.00.
>
> Both are the latest from HP.
>
> Unsure why, but the module itself reports version 20.100.00.00:
>
> [root at r1k1 sys] # cat module/mpt2sas/version
> 20.100.00.00

Suggestion: if these are new, they're under warranty, and it's a hardware
issue. Call HP tech support and open a ticket with them - they might have
an answer.

     mark