Re: sacrifice H310 hardware r5 for lvm2 raid5+lvmcache

I assumed that if firmware is capable of this then omsa 
should be too, but when I tried:

# omconfig storage controller action=setcontrollermode 
controller=0 mode=hba
Operation not supported. Read, action=setcontrollermode
Refer to the documentation for more information.

then I asked about that notion of vdisk=pdisk
Either I miss something in OMSA or it's weird again how OMSA 
developers are inconsistent, megacli does the trick for you.
thanks.


On 27/07/15 14:46, Paul Raines wrote:
>
> There may be a way to do it with omconfig / storcli / 
> MegaCLI but
> we just set the disk to "Non-RAID" in the boot up BIOS 
> tool of the
> RAID card (Ctrl-R).
>
> Install the 'lsscsi' tool which is useful for seeing 
> things in these cases
> It will show something like
>
> [0:2:0:0]    disk    DELL     PERC H310        2.12  /dev/sda
>
> for a virtual disk but after converted to non-RAID (JBOD) 
> it should show
> something like
>
> [0:2:0:0]    disk    ATA      ST2000DM001-1CH1 CC24  /dev/sda
>
> depending on disk make/model.  /dev/sda will also suddenly 
> be a few
> cylinders bigger.
>
> You want to wipe any partition table the OS finds on the 
> disk as it will have number of cylinders.  So something like
>
>    dd if=/dev/zero of=/dev/sdX count=1 bs=4k
>
> should do it.  Then run parted / gdisk / whatever 
> partition tool you like to recreate a new one.  Ignore any 
> error about a backup GPT table
>
> -- Paul Raines (http://help.nmr.mgh.harvard.edu)
>
>
>
> On Mon, 27 Jul 2015 9:26am, lejeczek wrote:
>
>> but would OMSA do it and without re-flashing the 
>> firmware? Or LSI's tool set is needed?
>>
>> On 27/07/15 14:21, Paul Raines wrote:
>>>
>>>  I cannot comment on the issue of using the hardware 
>>> RAID5 or not. However,
>>>  I will say from experience that 1-disk virtual disks 
>>> are bad idea.  If you
>>>  are doing that, you should put the disks in JBOD mode 
>>> instead. Doing a
>>>  1-disk vdisk just puts an unnecessarily layer on top of 
>>> disk I/O that
>>>  gives a added failure mode for no purpose.
>>>
>>>  -- Paul Raines (http://help.nmr.mgh.harvard.edu)
>>>
>>>
>>>
>>>  On Mon, 27 Jul 2015 3:48am, lejeczek wrote:
>>>
>>> >  what do you think?
>>> > >  dump raid5? change each pdisk into vdisk exposing 
>>> to OS and
>>> >  instead run lvm raid5 on those vdisks with a cache 
>>> device?
>>> > >  thanks.
>>> > >  _______________________________________________
>>> >  Linux-PowerEdge mailing list
>>> >  [email protected]
>>> > 
>>> https://lists.us.dell.com/mailman/listinfo/linux-poweredge
>>> > > >
>>>
>>>  The information in this e-mail is intended only for the 
>>> person to whom it
>>>  is
>>>  addressed. If you believe this e-mail was sent to you 
>>> in error and the
>>>  e-mail
>>>  contains patient information, please contact the 
>>> Partners Compliance
>>>  HelpLine at
>>>  http://www.partners.org/complianceline . If the e-mail 
>>> was sent to you in
>>>  error
>>>  but does not contain patient information, please 
>>> contact the sender and
>>>  properly
>>>  dispose of the e-mail.
>>>
>>>
>>
>>
>>
>