[Beowulf] hardware RAID versus mdadm versus LVM-striping
Alan Louis Scheinine
alscheinine at tuffmail.us
Sun Jan 17 19:13:28 PST 2010
I had a nightmare problem with a newly compiled kernel not booting.
The problem may have been with the command mkblkdevs of nash but in
any case I did extensive web search on the AHCI controller that I had
in both a notebook and a desktop computer, both of which had the
One example of the controller is
Intel ICH9M-E/M SATA AHCI Controller
In web postings there were many problems attributed to this controller.
It does RAID 1 using software. The Linux driver was (is?) a "work in progress"
from what I gather reading web postings.
Dr. A.J. Travis wrote:
> The problem with using an on-board RAID controller is that many of
> these are 'host' RAID (i.e. need a Windows driver to do the RAID)
> in which case you are using the CPU anyway, and they also use
> proprietary formats.
My point is to underline this fact. Hardware RAID 1 should be simple and
reliable. But when the RAID controller relies on software running on the
O/S, then it might be better to use Linux software RAID.
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Email: alscheinine at tuffmail.us
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