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 Post subject: Disk mirroring setup
PostPosted: Sun Jan 14, 2007 2:25 pm 
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Joined: Mon Apr 17, 2006 12:55 pm
Posts: 143
Location: Newcastle
Following a hard drive failure, i'm going to set up one of my drives to mirror the drive with my most vauable data, (I have all data backed up onto DVD, but it would be a pain getting it all back on).
As i don't want to end up mirroring a blank disk onto my drive with the data on, can i just check.
Do i need to set the disk i want to use as the mirror i.e. I want to copy data from Disk-0 to Disk-1 so do i go into the stoage configuration for Disk-1 and set it up to mirror Disk-0?
Also does it do a complete copy every time or does it just update any changes, and is this the best way to do a backup?

Thanks


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 Post subject:
PostPosted: Wed Jan 17, 2007 7:05 pm 
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Joined: Tue Feb 14, 2006 10:20 pm
Posts: 14
Quote:
Do i need to set the disk i want to use as the mirror i.e. I want to copy data from Disk-0 to Disk-1 so do i go into the stoage configuration for Disk-1 and set it up to mirror Disk-0?


In your example you would want to configure mirroring on Disk-1. The paramaters you use to configure it asks for the source drive which would be Disk-0 for what you want to do.

Quote:
Also does it do a complete copy every time or does it just update any changes


I would like to know the answer to this as well, I would hope it only mirrors changed data. Anyone?

Just remember, mirroring (like RAID) isn't a replacement for a backup! If you get corrupt/missing data, you will simply duplicate that problem on the other disk if you don't notice it before the mirroring happens again.


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 Post subject:
PostPosted: Wed Jan 17, 2007 11:02 pm 
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Joined: Tue Jul 13, 2004 4:11 pm
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Location: Server Elements
The mirror function uses rsync and copies only the changes. Some general details are provided in the mirror details log found on the disk status page of each mirror destination drive.


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 Post subject:
PostPosted: Fri Jan 19, 2007 12:34 pm 
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Joined: Mon Apr 17, 2006 12:55 pm
Posts: 143
Location: Newcastle
Thanks goldfinger, i just wanted to make sure.

Brilliant - thanks tony, i have quite a lot of data so it would take quite a while to do the whole lot every time.

Just as an aside, i hooked up my failed hard drive to an XP box and used an ext2 file reader, which recognised the drive, so i've got my data back. I've since done a test using Maxtor's powermax, and it's passed the quick test, and it's now in the process of running the full test.
What does Naslite check when booting to give a 'fail' on the filesystem check? I couldn't even get to the disk to show up in the configuration menu to run any tests on it.


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