<br><br><div class="gmail_quote">On Nov 10, 2007 10:51 AM, George Mari <<a href="mailto:george_mythusers@mari1938.org">george_mythusers@mari1938.org</a>> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div class="Ih2E3d">Ismo Tanskanen wrote:<br>> I use JFS file system for myth recordings, because it's ability to<br>> delete files quickly.<br>><br>> Now I'm wondering, if it needs defragment time to time? Does it? Is
<br>> there any utility to do that?<br>><br>> Or is there better filesystem for myth recordings?<br>><br>><br><br></div>I use JFS for my recordings as well. I've done some research and was<br>not able to find any defragging utility that would work with JFS.
<br><br>I've also not found any evidence that JFS needs to be defragmented.<br><br>I run FC6, so I grabbed the e2fsprogs package which includes the<br>filefrag utility. You can point the filefrag utility at your recordings
<br>directory and it will tell you how many extents (fragments) each file is<br>stored in. My filesystem is pretty full, so most of my recordings are<br>fragmented in 2 to 12 fragments. With this level of fragmentation I
<br>don't notice any performance issues.<br><br>If you really want to defragment your JFS filesystem, you could move all<br>your files off the filesystem, delete them from the original location,<br>and then copy them back.
<br><div><div></div><div class="Wj3C7c"></div></div></blockquote><div><br>I also use JFS and last week I had a big time scare. I'm running 5x500 GB SATA drives in a mdadm RAID5 On MythDora 4.0. I was having trouble with changing ownership of all the files/folders on the drive. So I stopped the mythbackend service and umounted the drive. I went to remount it, and it wouldn't mount. I was TERRIFIED. I was getting these cryptic error messges. After some research, I decided to run a file check on the drive. So I downloaded the jfs-utils RPM and ran that. It found some errors and fixed them. I only have about 200GBs left on that RAID array. I'm considering adding more drives. Should I not be using JFS since fragmentation might have caused this issue? I know XFS has issues with 4K stacks which is what Mythdora uses IIRC. Any ideas?
<br><br>Jim<br></div></div><br>