[CentOS] Installing CentOS 5.4 64bit on server with LSI SAS 1068E controller.
rswwalker at gmail.com
Sat Nov 28 00:35:06 UTC 2009
On Nov 27, 2009, at 6:19 PM, John R Pierce <pierce at hogranch.com> wrote:
> Steve Thompson wrote:
>> I have a bunch of machines with the LSI 1068E chip, and they _do_
>> fine with the default drivers, for both 5.3 and 5.4
> I'm curious... that chip  claims RAID 0/1/10/10e support and
> implies its hardware raid. Is the integrated RAID support in fact
> true raid, such that they present a single SCSI unit per logical
> or is it some form of fake raid which requires driver intervention to
> make it play? If it is hardware raid, does the chip/hardware
> transparently handle rebuilds? hot sparing? or does it rely on
> and drivers to implement these features?
Most LSI cards are true RAID.
> I'd certainly be concerned about the lack of raid cache memory with a
> battery back option, and would tend to want to use them as JBOD and
> the operating system native mdraid instead ...
If there is no write-back cache then there is no problem and RAID10 is
the best when there is no write-back cache.
It may be that the array wasn't defined properly or was offlined.
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