hpacucli gives 'Max array count reach' with HP Smart Array P420i raid controller on DL360p Gen8

[Asif Iqbal]

On Mon, May 9, 2016 at 3:51 PM, Jeffrey Lane <jeff at ubuntu.com> wrote:

> On Mon, May 9, 2016 at 3:26 PM, Decstasy <dj at decstasy.de> wrote:
> >> Personally, I'm a little more concerned that he's running software
> >> RAID 1 on top of a physical RAID 0
> >
> >
> > I totally agree with this...
> >
> >
> >> If one of the physical disks fails, he loses everything.  There is no
> >> protection at all from failure the way he has it set up...
> >
> >
> > As I understood he has:
> > +--------+--------+--------+--------+
> > | Disk 1 | Disk 2 | Disk 3 | Disk 4 |
> > +--------+--------+--------+--------+
> > | RAID 0          | RAID 0          | <- Via P420i RAID controller
> > +-----------------+-----------------+
> > |               RAID 1              | <- Via MD RAID
> > +-----------------------------------+
> > | Whatever Partition, LVM, FS etc.  |
> > +-----------------------------------+
> >
> > Is this correct Asif?
> >
> > If it's correct, one (or two - it depends) disk can fail without a data
> > loss.
>
> Yes, that is correct.  Asif contacted me off-thread and cleared up my
> confusion about the layout.  It stems from the fact that his RAID
> controller apparently doesn't support JBOD.
>
> Coincidentally, if you're going to be rebuilding and still want to
> just use JBOD, a quick google search returned hits like this:
>
> https://communities.vmware.com/thread/484114?start=0
>
> which indicate you CAN put the controller in JBOD mode, it's just not
> via an obvious config option.
>
> To View controller config using HPSSACLI with ESXCLI
> ~ # esxcli hpssacli cmd -q "controller slot=0 show config detail”
> To enable HBA mode on P420i using HPSSACLI
> ~ # esxcli hpssacli cmd -q “controller slot=0 modify hbamode=on forced"
>
> Additionally, there is the following doc from HPE:
> http://www.hp.com/ctg/Manual/c04441382
>
> that says:
> HPE Smart Array controllers support HBA mode. In HBA mode, all
> physical drives are presented directly
> to the operating system and the hardware RAID engine is disabled.
> To enable HBA mode, see the Smart Storage Administrator User Guide on
> the Hewlett Packard
> Enterprise website. (http://www.hpe.com/info/smartstorage-docs)
>
> So that second link should give you more info on the controller and
> putting it into HBA mode.
>
> (I hope).
>
> Cheers
>
> Jeff
>

Hmm.. I wish I knew about the HBA earlier. Thanks for the link.


-- 
Asif Iqbal
PGP Key: 0xE62693C5 KeyServer: pgp.mit.edu
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?
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