On Sat, Jan 18, 2020 at 01:20:39PM +1100, pushin.linux wrote:
> I have elected to start with a Ubuntu 18.04 LTS desktop install.The Raid
> drives were picked up, ie are available, but does the balance command need
> to be issued again?
You only need to run 'btrfs balance' when you're changing the number and/or
size of drives (or partitions) in the btrfs array. The command re-balances all
of the data on the array, roughly-equally across all the drives.
So, if you're not adding drives to the array, you don't need to re-balance it.
(btw, 'btrfs balance' is the one feature that btrfs has that I wish zfs had)
> I had two lines to set up the raid and balance them at the start.
IIRC, I think I advised you to do something like: 1. create a degraded btrfs
array with just one of the drives; 2. copy your data to it; 3. add another drive
to the btrfs array with 'btrfs add'; 4. re-balance the data so that it's on both
drives with 'btrfs balance'.
If so, that'll be why you have two commands written down.
> I suspect that without those commands only one drive will be written to.
nope.
This time around, your btrfs array for /data ALREADY EXISTS, so you don't have
to do any of that.
And you certainly SHOULD NOT run mkfs.btrfs, that would erase your current
btrfs array and re-format it.
All you need to do this time is add an entry to /etc/fstab so that it mounts
correctly on boot. Something like the following:
UUID="c0483385-ca6f-abb3-aeeb-94793439a637" /data btrfs
defaults,relatime 0 0
run 'blkid' to find the correct uuid for your /data fs and use it instead
of the bogus one in the example above.
craig
--
craig sanders <[email protected]>
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