On 03/10/15 12:29, Gordon Messmer wrote:
On 03/09/2015 11:04 AM, Bob Goodwin wrote:
However I have been wondering if it wouldn't work just as well to
periodically rsync the drive in use with a second drive?
I know I'm going to repeat some of what has already been said. My 2c
anyway:
No, rsync would not work just as well.
Do you want your system to continue functioning when one of your
drives fails? If so, then set up RAID1 and make sure you actually get
and read email from cron jobs. In the event of failure, the mdmonitor
service will send email to "root" to indicate that a drive needs to be
replaced. The down side is that your data will have no backups. If a
file is accidentally deleted or corrupted, you probably have no recourse.
Do you, instead, want multiple levels of online backups? In that
case, there are a handful of backup applications, including rsnapshot,
that handle rotation and rsync to provide efficient backups. If your
primary drive fails, you'll deal with the outage while you get a
replacement drive, format it, install a system, restore your data,
etc, which could be a fairly long process. Instead, you'll gain very
coarse file versions and protection from accidental deletions.
Am I going wrong somewhere in my thinking?
Thinking that you have to make a choice between the two may be in
error. Depending on the size of your disks and the amount of data on
them, you could potentially have both RAID1 and backups.
Build a system with a RAID1 mirror on the two drives that uses half of
the available space for your system, and half of the space for a
separate backup filesystem. Keeping the backup filesystem separate
provides some additional protection against filesystem corruption.
It's still possible for some errors to destroy both your system and
its backups, but in most cases, you'll get good coverage for the most
common failures with this setup.
.
Well as I said earlier, I mainly want to have files that I consider
critical backed up somewhere. I'm not very much concerned about
equipment failure and downtime. I've been backing stuff up between
computers using rsync so that I'll always have a fairly recent copy of
my notes, checking account, genealogy, etc.
Presently most of that data resides on a 1 TB drive in an NFS server
running SL-6. I have two new WD/black 1 TB drives, that I am going to
use on the computer I'm working on which is presently running Fedora-21,
probably not the best choice for the purpose but I thought I'd try it.
I also have a Raid1 samba server [SL-7], mainly to deal with the family
Apple users [everyone but me]. I have never received any messages from
that. As it stands I might not know if there was a failure, I've been
worrying about that!
I am considering everything in the responses I've received ...
Thanks,
Bob
--
http://www.qrz.com/db/W2BOD
box10 Fedora-21/64bit Linux/XFCE
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