Re: Installing CentOS 5.4 64bit on server with LSI SAS 1068E controller.

[Ross Walker <rswwalker@xxxxxxxxx>]

On Nov 27, 2009, at 6:19 PM, John R Pierce <pierce@xxxxxxxxxxxx> wrote:

> Steve Thompson wrote:
>> I have a bunch of machines with the LSI 1068E chip, and they _do_  
>> work
>> fine with the default drivers, for both 5.3 and 5.4
>
>
> I'm curious...   that chip [1] 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  
> volume,
> 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  
> BIOS
> 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  
> use
> 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.

-Rosa
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