Thanks Craig,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?I had two lines to set up the raid and balance
them at the start. I suspect that without those commands only one drive will be
written to.Thanks for your assistanceAndrewSent from Samsung tablet.
-------- Original message --------From: Craig Sanders via luv-main
<[email protected]> Date: 18/1/20 12:59 pm (GMT+10:00) To:
[email protected] Subject: Re: Rebuild after disk fail On Fri, Jan 17, 2020
at 11:36:29AM +1100, Andrew Greig wrote:> I recently experienced an SSD
failure, and so I have purchased another to> set up my system again. I received
some substantial help from this list> early in 2019 to build my machine with
this SSD as / and /home under Ubuntu> 18.04 with two x 2Tb conventional drives
in RAID for storing my work, all> are running btrfs.You lost your home dir and
the data in it when your SSD failed Because yourrootfs and /home on the SSD
doesn't have any redundancy (i.e. it was a singlepartition, with no RAID). I
strongly recommend setting up a cron job toregularly snapshot it (at least
once/day) and do a 'btrfs send' of thatsnapshot to a sub-volume of your /data
filesystem.That way you won't lose much data from that partition if your SSD
dies again- you can retrieve it from the last snapshot backup, and will only
lose anychanges since then.If your / and /home are on separate partitions (or
btrfs sub-volumes) you willneed to do this for both of them.(if you weren't
running btrfs on /, you could do this with rsync instead of'btrfs send', but
rsync would be a lot slower)IME, drives are fragile and prone to failure. It's
always best to make plansand backup procedures so that WHEN (not IF) a drive
fails, you don't loseanything important...or, at least, minimise your
losses.Also, remember that RAID is not a substitute for backup so you
shouldregularly backup your /data filesystem to tape or other drives.
Ideally,you should try to have an off-site backup in case of fire/flood/etc
(e.g.backup to an external USB drive and store it at your office, lawyer's
safe, afriend's house or somewhere. Have at least two of these so you can
rotate theoffsite backups).> After the machine was running I was asked if I had
set up the machine using> Ubuntu Server, I hadn't, because at that time I
didn't see those options.>> I am thinking, then, for this build, perhaps I
should set it up using Ubuntu> Server. I will need to get my system to
recognise the RAID drives as well.If the installer doesn't automatically detect
your /data btrfs filesystem andadd it to /etc/fstab, it's easy enough to add it
yourself.> So before I jump in the deep end again, are there any "gotchas" of
which I> should be aware.>> Will the server version make life more reliable?the
only significant difference between the server and desktop versions ofubuntu
are the packages which are installed by default. e.g. the desktopversion
installs a whole bunch of desktop stuff (X, desktop environment andGUI apps,
etc) that the server version doesn't. Otherwise, they're the same -same kernel,
same libc and other standard system libraries, etc.craig--craig sanders
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