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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";
color:blue'>I’m starting to lean towards RAID1 or RAID10. There is one
thing that I am not clear on with RAID1, maybe someone can help me here.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";
color:blue'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";
color:blue'>I understand the RAID is created out of partitions, as opposed to
physical drives. Does this mean I can divide 3 x HDD’s into 6 equal
partitions, and then set up a RAID-1 solution that mirrors each partition on
another partition that resides on a separate physical drive? ie I don’t need
an even number of disks for a mirrored system? If so, how does adding in more disks
work? <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";
color:blue'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:
"Tahoma","sans-serif";color:windowtext'>From:</span></b><span lang=EN-US
style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'>
mythtvnz-bounces@lists.linuxnut.co.nz
[mailto:mythtvnz-bounces@lists.linuxnut.co.nz] <b>On Behalf Of </b>Dean
Pemberton<br>
<b>Sent:</b> Tuesday, 16 June 2009 11:04 a.m.<br>
<b>To:</b> MythTV in NZ<br>
<b>Subject:</b> Re: [mythtvnz] File System for RAID-5<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Jim Cheetham wrote: <o:p></o:p></p>
<pre>On Mon, Jun 15, 2009 at 8:16 PM, Karl Leaning<a
href="mailto:mythtv@objectivity.co.nz"><mythtv@objectivity.co.nz></a> wrote:<o:p></o:p></pre><pre> <o:p></o:p></pre>
<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><pre>Umm, no with raid 5, you lose a drive not the data. add a new drive<o:p></o:p></pre><pre>"rebuild" the set and continue as normal...<o:p></o:p></pre><pre> <o:p></o:p></pre></blockquote>
<pre><o:p> </o:p></pre><pre>Yes, true. Do you have a spare drive online? If you did, wouldn't you<o:p></o:p></pre><pre>be using it as a hot spare or part of the data set already?<o:p></o:p></pre><pre><o:p> </o:p></pre><pre>If you lose a second drive while one drive is out of action ... you<o:p></o:p></pre><pre>lose data. Gone.<o:p></o:p></pre><pre> <o:p></o:p></pre>
<p class=MsoNormal style='margin-bottom:12.0pt'>Almost everything which has
been mentioned in this thread is correct. It just comes down to what
experiences you have had in the past.<br>
<br>
I have to agree that RAID is not a backup solution. I run 2x 1TB USB
disks for off-site backup (no tv episodes or DVD rips make it onto these as
they are all disposable).<br>
<br>
For data continuity on the other hand, I run the disks on my SAN in a RAID-5
set.<br>
<br>
Recently one of the 1TB disks threw 'recoverable'[1] errors up in the kernel
log.<br>
<br>
I called my equipment supplier and lodged an RMA. Took 2 days.<br>
When they had my new drive ready, I pulled the faulty drive out of the hotswap
bay[2][3] and swapped it with them.<br>
I put the new drive in, it rebuilt, nothing missed a beat.<br>
<br>
Now sure there are a number of things which could have gone wrong during this
process. Most of them have been covered (second disk failing while I had
the first one out, rebuild failing, disk TOTALLY failing while waiting for the
RMA). It is important to note however that in his case it all went
as planned.<br>
<br>
So while people are correct to talk about potential disaster from running
RAID-5. These are not guaranteed outcomes, sometimes it doesn't effect
WAF at all. =)<br>
<br>
<br>
<br>
Dean<br>
<br>
[1] these errors are never recoverable. As mentioned earlier, ANY
errors are bad, replace the disk immediately.<br>
[2] $25 was what they cost. Worth their weight in gold.<br>
[3] Always label the front of the caddy with the serial number of the
disk inside. You can then know which drive to pull. Otherwise if
you pull the wrong one, you may be in trouble.<br>
<br>
<o:p></o:p></p>
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