On 14/12/17 02:26, John Andersen wrote:
On 12/13/2017 12:49 PM, Paul Neuwirth wrote:
In future I will order identical disks at
The beauty of MDRaid is you don't have to have identical disks.
They don't even have to be of the same interface type, but you'd probably want
that for sanity sake.
You'd expect to use only as much on each disk as the smallest disk in the raid.
Talking about md, yes that is true unless you're using one of the 0
raids. But it's actually quite common (or so it seems) for people to
upgrade disk storage by replacing disks one by one.
Given the OP's scenario yes I would recommend raid-6 over four disks.
Yes that *will* survive a double disk failure unlike raid-10 which has a
30% chance of losing the array.
Yes you MUST scrub your array regularly - but NEVER run a "fix" scrub!
If scrub reports errors then there's a program called (I think)
raid6restore, which will find and fix a broken block. A repair scrub
just recalculates parity which, although it's usually parity that's
broken, if it's a data block that's broken then your data has just been
As for integrity checking your data, yes I'd be interested ... most file
systems seem to be more interested in protecting their own integrity,
metadata is checksummed but rarely data :-( By all means use btrfs over
md-raid, btrfs-raid is severely experimental it seems. zfs-raid
apparently works (I wouldn't know).
And yes, make sure your eSATA supports port splitting - I've been
looking for that sort of thing too and a LOT of stuff out there doesn't.
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