On 03/09/15 20:23, Sam Varshavchik wrote:
Bob Goodwin writes:
I had a mainboard fail in a box I use as a server, I moved the hard
drive into old computer and carried on from there. Now I've replaced
the board and intended to set it up using Raid to mirror two drives.
However I have been wondering if it wouldn't work just as well to
periodically rsync the drive in use with a second drive?
That seems a more direct approach and I could easily check to make
certain that the second drive was a usable copy, insurance against
loss of data.
Am I going wrong somewhere in my thinking?
Raid, and rsyncing, are not equivalent to each other. They solve
different problems.
For starters, in your case taking an existing partition and turning it
into a RAID volume is going to be a big project. You'll have to back
up your existing data somewhere, erase the existing partition, create
a raid partition, then restore your data from backups. I'm not aware
of a way to turn an existing non-RAID partition into a RAID one.
I had intended to set up the raid server first and then transfer data
from the original drive, that seemed like it should would work?
And yes, I think rsync is really what I want anyway since I'm more
interested in saving the data in two places to minimize the chance of
losing everything with a failure of some kind. I realize there is a
chance of losing some data depending on when the failure occurs relative
to the last rsync and I'm willing to accept that. My files are important
to me but not so critical that I need to cover every possibility.
rsync is easier to set up when you have existing data, and I do have a
few laptops where I have a daily job to rsync their data onto a
different server.
I have been using rsync to make copies of files between several
computers for some time and it works without a hitch for me ...
On the other hand, RAID is generally faster, and runs in realtime.
With rsync, you do have some window of vulnerability where you will
lose everything since your last rsync run, when you have a failure,
where RAID provides up to the second redundancy.
So it looks like that is a reasonable thing to try. I've set up the NFS
server and will transfer some data into it tomorrow.
Thanks for the advice,
Bob
--
http://www.qrz.com/db/W2BOD
box10 Fedora-21/64bit Linux/XFCE
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