On Sunday 24 Feb 2013 14:22:42 Peter wrote:
> On 24/02/13 12:00, [email protected] wrote:
> > One final question; I've never played around with RAID before. What
> > happens if I remove one disc from the array and then power the machine
> > up? Is this a reasonable simulation of a failing disc?
> I can only speak for a large SAN and yes removal of a single disk equates to
> a disk failure and the new disk insertion begins the rebuild BUT on a SAN
> we usually have extra redundancy built in by never using more than about
> 80% of total disk hence while the disk is being rebuilt the system does
> manage to cope.
I rather suspect that we will never get anywhere near 80% disc utilisation.
Out of the box, the Win XP installation seems to consume a few Gigs or so of
the one hundred available and our software isn't what you would call
bloatware.
If the full installation exceeds 25 GB, I would be surprised. The the users
will only have a few additional config files to write.
> I would be interested to know what you do and how it goes because each of
> our servers has a pair of internal disks in RAID 0 and an external SAN. So
> far no internal disks have failed - but as we all know that is almost
> surely going to happen !
I'll let you know in due course. These machines aren't actually servers;
they're Controllers. As I mentioned earlier, the main reason we selected RAID
was to improve availability for that important 10-15 mins, while the users
finish what they are doing or exit the system gracefully.
--
Terry Coles
64 bit computing with Kubuntu Linux
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