On Mon, May 9, 2016 at 3:51 PM, Jeffrey Lane <[email protected]> wrote:
> On Mon, May 9, 2016 at 3:26 PM, Decstasy <[email protected]> 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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