On Tue, Oct 18, 2011 at 8:55 PM, Karanbir Singh <mail-lists@xxxxxxxxx> wrote:
> On 10/18/2011 04:11 PM, Arun Khan wrote:
>> You mean, it is not OK to pull out a "functioning" disk? Pulling one
>> disk out of RAID 5 should be OK. Am I missing something?
>
> grab yourself a bunch of usb keys + a usb hub - fire up mdadm on your
> laptop and use those keys as target disks and see how things work with
> mdadm and hotswap. Much fun to be had there. I would also recommend
> using CentOS6.
Thanks for the suggestion - a great way to experiment.
>From the feedback on this thread, I am leaning towards h/w raid controller.
> Pulling a disk that isnt set bad and deactivated in mdadm can cause some
> very funky results - best of all, the machine will freeze and you can
> reinsert the disk boot up and carry on. Worst of all, you will lose all
> the data on the array.
I agree.
> btw, dont think that these issues dont affect hardware raid - they do.
> its just that the management for these things is slightly more
> abstracted away and the controllers are better integrated with the disk
> cages.
About 10 years ago, I had a h/w raid controller go bad (HDDs connected
via SCSI cable - no HDD bays involved). The replacement card
recreated the RAID array - lost all data. I did have a back up to
restore most of the data.
-- Arun Khan
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