On Mon, 4 Mar 2013, Ronald F. Guilmette wrote:
Now, unfortunately, I have just been bitten by the evil... and apparently
widely known (except to me)... ``You can't use dump(8) to dump a journaled
filesystem with soft updates'' bug-a-boo.
Until SUJ has been deemed 100%, I avoid it and suggest others do also.
It can be disabled on an existing filesystem from single user mode.
If I use all of the following rsync options... -a,-H,-A, -X, and -S ....
when trying to make my backups, and if I do whatever additional fiddling
is necessary to insure that I separately copy over the MBR and boot loader
also to my backup drive, then is there any reason that, in the event of
a sudden meteor shower that takes out my primary disk drive while leaving
my backup drive intact, I can't just unplug my old primary drive, plug in
my (rsync-created) backup drive, reboot and be back in the sadddle again,
almost immediately, and with -zero- problems?
It works. I use this to "slow mirror" SSDs to a hard disk, avoiding the
speed penalty of combining an SSD with a hard disk in RAID1.
Use the latest net/rsync port, and enable the FLAGS option. I use these
options, copying each filesystem individually:
-axHAXS --delete --fileflags --force-change
--delete removes files present on the copy that are not on the original.
Some people may want to leave those.
--exclude= is used on certain filesystems to skip directories that are
full of easily recreated data that changes often, like /usr/obj.
Yes, the partitions and bootcode must be set up beforehand. After that,
it works. Like any disk redundancy scheme, test it before an emergency.
P.P.S. Before anyone asks, no I really _do not_ want to just use RAID
as my one and only backup strategy. RAID is swell if your only problem
is hardware failures. As far as I know however it will not save your
bacon in the event of a fumble fingers "rm -rf *" moment. Only frequent
and routine actual backups can do that.
Yes, RAID is not a backup. Another suggestion I've been making often:
use sysutils/rsnapshot to make an accessible history of files. The
archive go on another partition on the mirror drive, which likely has
more space than the original. rsnapshot uses rsync with hard links to
make an archive that lets you easily get to old versions of files that
have changed in the last few hours/days/weeks/months.
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