On 01/05/2014 01:02 PM, Jim Salter wrote:
If you want LZO compression, as you specified:
/dev/sdc /path/to/mountpoint compress=lzo,noauto,users,user 0 0
Better yet, if your btrfs is actually on /dev/sdc right now, let's get
that fstab entry mounting it by UUID instead.
ls -l /dev/disk/by-uuid | grep sdc
lrwxrwxrwx 1 root root 10 Jan 3 09:40
12345678-9abc0-1234-5678-9a0123456789 -> ../../sdc
So then:
# this is not a real UUID, you need to check
/dev/disk/by-uuid on your machine for a real UUID
UUID=12345678-9abc0-1234-5678-9a0123456789
/path/to/mountpoint compress=lzo,noauto,users,user 0 0
This is EXTRA important with a USB drive, since it's HIGHLY likely it
won't always be on the same physical devicename.
One other note: in this particular case, you might actually be better
served setting compression by mounting the drive normally, then:
cd /path/to/drive
chattr +c . ; chattr +c * ; chattr +c .*
This will set compression on by default for any future files stored on
that USB drive, *without* needing any special mount options.
Why might this be a better idea? Well, if it's a USB drive, presumably
you might want to mount it on foreign systems from time to time. This
way, even if you mount the drive on a foreign system that doesn't know
anything about your preferences, it will see the +c on the root
directory of the drive, and store any new data on the drive compressed.
The only caveat: +c won't set the compression algorithm to LZO. It'll be
gzip, which is the default algorithm. (And, of course, this won't
compress any EXISTING data already stored there - only NEW data written
to it after you set the +c attribute.)
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