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<div class="gmail_quote">On Wed, Apr 21, 2010 at 3:58 PM, Brian Wood <span dir="ltr"><<a href="mailto:beww@beww.org">beww@beww.org</a>></span> wrote:<br>
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<div class="h5">On Wednesday 21 April 2010 01:03:44 pm Indulis Bernsteins wrote:<br>> >Oh, and do yourself a favor and use a separate disk for the OS and<br>><br>> database.<br>><br>> >I didn't do that the first time out and ended up having to change things<br>
> >around. An old 40G IDE drive worked great for that, then I dedicated the<br>> >500G SATA drive to recordings and solved some irritating drop-outs in<br>> >recordings. Don't skimp on RAM either, particularly if you are going to<br>
> >attempt an FE install on that box as you will want to dedicate 512M to<br>><br>> video<br>><br>> >for VDPAU.<br>><br>> I have been running for a couple of months on one drive- I use LVM to<br>
> "split up" the drive into separate OS and data partitions or Logical<br>> VOlumes (like disk partitions but in a nice flexible way cf PITA disk<br>> partitions). Nice because you can migrate them between drives, shrink,<br>
> grow (as long as filesystem you choose can do likewise). This is a 1TB<br>> SATA drive 3 Gbps and it can record 3-4 digital broadcasts at a time (and<br>> do some web surfing) with no problems at all- have never had a<br>
> stutter/glitch. I am using XFS as the filesystem tuned up as documented<br>> in the mythtv wiki. This probably makes a big difference compared to<br>> ext3/4 etc- especially cluster size.<br>><br>> Actually the LVM is on top of RAID ("md" s/w RAID done by the Linux<br>
> kernel) but I haven't set up the 2nd drive as a mirror yet- just noticed<br>> it the other night! I am tempting fate now...<br>><br>> If you use LVM then once you get a 2nd drive you can set up a "pending<br>
> mirror" RAID10 on it, then use LVM to just migrate your data to the 2nd<br>> drive. Once done, set up mirror on 1st drive, and let "md" synchronise<br>> the two!<br>><br>> I dont agree with using an old 40GB drive as drives have a shelf life, you<br>
> are asking for trouble using an old drive. IMHO...<br><br></div></div>True perhaps, but I think you are also asking for problems if you have your<br>OS/database and video storage on the same spindle, regardless of partitions<br>
etc. You want them on different devices, spindles, drives or whatever you want<br>to call them. Having them on separate partitions doesn't help, at least in my<br>experience.<br><br>Heavy database usage takes a lot of drive action, and if you are<br>
reading/writing many HD streams at the same time this can cause trouble.<br>
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</div></div></blockquote></div><br>At this point, it would seem important to define "heavy" and "many" in this context, as it could be causing people to purchase/run power consuming hard drives unnecessarily. Has anyone ever done a back to back test showing that sharing a spindle will cause this problem, and has it been done recently with modern hardware? Just because it was a good idea 6 years ago, doesn't mean it will always be. That being said, I keep all my OS/Database installs separate from my recordings, and will likely continue to.