On 19/04/2011 16:07, Mathias BurÃn wrote:
On 19 April 2011 15:04, David Brown<david@xxxxxxxxxxxxxxx> wrote:
On 19/04/2011 15:25, Mathias BurÃn wrote:
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. Booting 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. The 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. As 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
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).
Are you sure about the syntax for that command? Trying that with "0" for $I
just gives me "megaraid,0: No such file or directory". As far as I can see,
the megaraid module is loaded (lsmod shows "megaraid_sas" in the modules
list).
Thanks anyway,
David
From the smartctl man page:
Under Linux , to look at SCSI/SAS disks behind LSI MegaRAID
controllers, use syntax such as:
smartctl -a -d megaraid,2 /dev/sda
smartctl -a -d megaraid,0 /dev/sdb
where in the argument megaraid,N, the integer N is the
physical disk number within the MegaRAID controller. This interface
will also work for Dell PERC controllers. The followâ
ing /dev/XXX entry must exist:
For PERC2/3/4 controllers: /dev/megadev0
For PERC5/6 controllers: /dev/megaraid_sas_ioctl_node
Maybe you can experiment some with that. Regards,
M
Ah, it was "smartctl" - you first wrote "hdparm". I should have thought
of smartctl myself.
Still no luck as yet - the smartctl on my test installation (Centos 5.6)
doesn't seem to support megaraid devices. But maybe that's just because
it is an older version of smartctl - Centos 5.6 is not exactly "bleeding
edge".
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