Re: Direct disk access on IBM Server

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On 19 April 2011 14:21, David Brown <david@xxxxxxxxxxxxxxx> wrote:
> I have recently got an IBM x3650 M3 server, which has a "Serveraid M5014"
> raid controller. ÂBooting from a Linux CD (system rescue CD) and running
> lspci identifies this raid controller as:
>
> LSI Logic/Symbus Logic Megaraid SAS 2108 [Liberator] (rev 03)
>
> The controller works fine for hardware raid - I can open its bios setup
> utility, and set up a RAID5 (or whatever) with the disks I have. ÂThe OS
> then just sees a single virtual disk.
>
> But I would like direct access to the sata drives - I want to set up mdadm
> raid, under my own control. ÂAs far as I can see, there is no way to put
> this controller into "JBOD" or "direct access" mode of any sort.
>
> Does anyone here have experience with this card, or can give me any hints?
>
> The only idea I have at the moment is to put each disk within its own
> single-disk RAID 0 set, but then I don't get sata hot-swap functionality,
> SMART, hddtemp, etc.
>
> Thanks for any clues or hints,
>
> David
>
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Regarding SMART, could you try (after loading the appropriate
megaraid/megasas module) hdparm -a -d megaraid,$I /dev/sda , where $I
is a number between 0 and 31 IIRC (depending on the HDD in the array).

Regards,
M
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