David Rees schrieb: (...)
> For example, if you perform a small write across two stripes, that > means you have to read/write two 64kB stripes in your case. By > aligning writes, you could have avoided this and only read/write a > single 64kB stripe. It's pretty easy to see how this might affect > performance. Looks like a question for linux-lvm mailing list. >> Hey, I just disabled internal bitmap in RAID-5 and it seems the things >> are much faster now - this is "iostat sda -d 10" output without the >> internal bitmap. > > Doh, I forgot about RAID-5 bitmaps. I did a quick search and it > appears that bitmaps can really kill performance. But it does prevent > a full-resync after a crash. I don't think it's worth it in your case. Technically, it is possible to place the bitmap file on a separate device. -- Tomasz Chmielewski http://wpkg.org ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ BackupPC-users mailing list [email protected] List: https://lists.sourceforge.net/lists/listinfo/backuppc-users Wiki: http://backuppc.wiki.sourceforge.net Project: http://backuppc.sourceforge.net/
