Hi Craig,
Yes, the problem was my Motherboard would not handle enough disks, and
we did Format sdc with btrfs and left the sdb alone so that btrfs could
arrange things between them.
I was hoping to get an understanding of how the RAID drives remembered
the "Balance" command when the the whole of the root filesystem was
replaced on a new SSD. I thought that control would have rested with
/etc/fstab. How do the drives know to balance themselves, is there a
command resident in sdc1?
My plan is to have auto backups, and given that my activity has seen an
SSD go down in 12 months, maybe at 10 months I should build a new box,
something which will handle 64Gb RAM and have a decent Open Source
Graphics driver. And put the / on a pair of 1Tb SSDs.
Many thanks
Andrew
On 18/1/20 6:44 pm, Craig Sanders via luv-main wrote:
On Sat, Jan 18, 2020 at 02:14:46PM +1100, Andrew McGlashan wrote:
Just some thoughts....
Way back, SSDs were expensive and less reliable than today.
Given the cost of SSDs today, I would consider even RAIDING the SSDs.
If it's physically possible to install a second SSD of the same storage
capacity or larger then he absolutely should do so. I vaguely recall
suggesting he should get a second SSD for the rootfs ages ago, but my
understanding / assumption was that there was only physical space and
connectors for one SSD in the machine.
The 'btrfs snapshot' + 'btrfs send' suggestion was just a way of regularly
backing up a single-drive btrfs filesystem onto his raid-1 btrfs array so that
little or nothing was lost in case of another drive failure. It's less than
ideal, but a LOT better than nothing.
I personally would never use anything less than RAID-1 (or equivalent, such
as a mirrored pair on zfs) for any storage. Which means, of course, that I'm
used to paying double for my storage capacity - i can't just buy one, I have
to buy a pair. Not as a substitute for regular backups, but for convenience
when only one drive of a pair has died.
Drives die, and the time & inconvenience of dealing with that (and the lost
data) cost far more than the price of a second drive for raid-1/mirror.
craig
--
craig sanders <c...@taz.net.au>
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