Re: News server switcharoo
Duncan <1i5t5.duncan <at> cox.net>
2012-08-19 21:03:18 GMT
Lars Magne Ingebrigtsen posted on Sun, 19 Aug 2012 18:25:02 +0200 as
> asjo <at> koldfront.dk (Adam Sjøgren) writes:
>>> When that happens, the RAID card will hopefully handle that well, but
>>> we'll see...
>> It handled yanking a disk as expected, I hope?
> But I think that's a failure mode most controllers handle well, because
> it's so easy to test. However, when the SATA thing is still plugged in,
> but responds with nonsense, that's more difficult to test.
That's one of the good things about both md and dm raid in Linux.
There's a fault injector available to test just that sort of thing,
spewing nonsense! =:^)
Meanwhile, I've never really tried raid-5 here. I did run raid-6 for
awhile, then switched to raid-1, but I never did trust the single-
redundancy of raid-5. It always seemed to me that if I were going to
bother with anything beyond dual-disk raid-1, a second redundancy was
next up the list, either in triple-way raid-1, or 4-device raid-6. I've
wanted to try raid-10 too, but again, don't want to change it with four
disks so would go dual-redundancy raid-10 with six devices, and I've just
never managed the necessary budget priority for it, here.
The other thing about raid-5 on SSDs, is that they tend to be faster at