Re: Various Questions

[Carl Cook <CACook@quantum-sci.com>]

In addition to the questions below, if anyone has a chance could you advise on why my destination drive has more data  than the source after this command:
# rsync --hard-links --delete --inplace --archive --numeric-ids /media/disk/* /home
sending incremental file list
sent 658660 bytes  received 2433 bytes  1322186.00 bytes/sec
total size is 1355368091626  speedup is 2050192.77

# df /media/disk
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/md2             1868468340 1315408384 553059956  71% /media/disk
# df /home
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/sdb             3907029168 1325491836 2581537332  34% /home




On Fri 07 January 2011 10:55:43 Carl Cook wrote:
> 
> Wow, this rsync and backup system is pretty amazing.  I've always just tarred each directory manually, but now find I can RELIABLY automate backups, and have SOLID versioning to boot.  Thanks to everyone who advised, especially Freddie and Anthony.
> 
> I am still waiting for hardware for my backup server, but have been preparing.  On the backup server I'll be doing pull backups for everything except my phone (which is connected intermittently).  I'm going to set up a cron script on the backup server to pull backups once a week (as opposed to once/mo which I've done for 12 years).  I am at a loss how to to lock the database on the HTPC while exporting the dump, as per Lloyd Standish, but will study it.  (Freddie gave a nice script, but it doesn't seem to lock/flush first)  Also don't know how to email results/success/fail on completion, as I've not a very good coder.
> 
> But here is my proposed cron:
> btrfs subvolume snapshot hex:///home /media/backups/snapshots/hex-{DATE}
> rsync --archive --hard-links --delete-during --delete-excluded --inplace --numeric-ids -e ssh --exclude-from=/media/backups/exclude-hex hex:///home /media/backups/hex
> btrfs subvolume snapshot droog:///home /media/backups/snapshots/droog-{DATE}
> rsync --archive --hard-links --delete-during --delete-excluded --inplace --numeric-ids -e ssh --exclude-from=/media/backups/exclude-droog droog:///home /media/backups/droog
> 
> My root filesystems are ext4, so I guess they cannot be snapshotted before backup.  My home directories are/will be BTRFS though.
> 
> 
> On Fri 07 January 2011 08:14:17 Hubert Kario wrote:
> >> I'd suggest at least 
> >> mkfs.btrfs -m raid1 -d raid0 /dev/sdc /dev/sdd
> >> if you really want raid0
> >
> > I don't fully understand -m or -d.  Why would this make a truer raid0 that with no options?
> 
> I am beginning to suspect that this is the -default- behavior, as described in the wiki:
> "# Create a filesystem across four drives (metadata mirrored, data striped)"
> 
> Should I turn off the writeback cache on each drive when running BTRFS?
> 
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