[ubuntu-za] Virtual Machine Server

Charl Wentzel charl.wentzel at vodamail.co.za
Thu Oct 22 08:23:17 BST 2009

On Thu, 2009-10-22 at 09:12 +0200, Deon Spengler wrote:
> > Are you saying that mdadm ("software RAID") is faster than this
> > particular RAID card or that the speed difference is not significant?
> > 
> > Looking at the spec again I see it's a SATA card, which probably
> > eliminates hot-swapping of hard drives, which is probably one of the
> > main benefits of having hardware RAID.  
> I am saying that under the right conditions mdadm is faster than
> hardware RAID, if one is doing RAID 5 or 6, hardware RAID will always be
> faster than mdadm. There is almost no overhead with RAID 0, 1 or 10
> while using mdadm. MDADM RAID 10 in most cases will be faster than
> hardware RAID. MDADM does support hot-swapping with SATA Disc's and
> online array rebuilds.

Really? Wow! But I guess the hardware must support hot-swapping on SATA?

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