On 2018-07-20 14:41, Hugo Mills wrote:
On Fri, Jul 20, 2018 at 09:38:14PM +0300, Andrei Borzenkov wrote:
20.07.2018 20:16, Goffredo Baroncelli пишет:
[snip]
Limiting the number of disk per raid, in BTRFS would be quite simple to implement in the
"chunk allocator"
You mean that currently RAID5 stripe size is equal to number of disks?
Well, I suppose nobody is using btrfs with disk pools of two or three
digits size.
But they are (even if not very many of them) -- we've seen at least
one person with something like 40 or 50 devices in the array. They'd
definitely got into /dev/sdac territory. I don't recall what RAID level
they were using. I think it was either RAID-1 or -10.
That's the largest I can recall seeing mention of, though.
I've talked to at least two people using it on 100+ disks in a SAN
situation. In both cases however, BTRFS itself was only seeing about 20
devices and running in raid0 mode on them, with each of those being a
RAID6 volume configured on the SAN node holding the disks for it. From
what I understood when talking to them, they actually got rather good
performance in this setup, though maintenance was a bit of a pain.
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