On Tuesday, February 9, 2016, 22:42:02, alanb wrote: > In my case the CPU usage was normal throughout the whole process. Are > you experiencing high CPU usage when the problem surfaces?
Yes, I first noticed that jfsCommit was using around 90-100% of a core, and that the backup suddenly slowed down. > In my case, I noticed that my disk was "thrashing" about while in the > slow state, the noise made by the drive in an open case was very > noticeable. When it was transferring normally, the disk was nearly > inaudible. Also the approximate 1TB threshold seemed to be a sharp > dropping point, performance quickly degraded once that point was reached. I can't speak of disk thrashing, because both computers where I noticed this are in different rooms than where I normally work. > I will need to use something for these large images, the problem makes > JFS unusable and the thrashing may even destroy my HD. My next test is > to switch to ext4 or XFS and do a transfer of the same 2TB image file. I switched to xfs on one computer, and it seems to perform well (one of the backup images is currently 1043GB - I couldn't take this backup with jfs at all, but there was a noticeable speed increase with another, where the base image is 140GB - on jfs it took about an hour to create increments and merge the oldest increment into base, while it now takes about 10-15 minutes). -- < Jernej Simončič ><><><><>< http://eternallybored.org/ > If you mess with something long enough, it'll break. -- Farmer's Comment ------------------------------------------------------------------------------ Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor end-to-end web transactions and take corrective actions now Troubleshoot faster and improve end-user experience. Signup Now! http://pubads.g.doubleclick.net/gampad/clk?id=272487151&iu=/4140 _______________________________________________ Jfs-discussion mailing list Jfs-discussion@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jfs-discussion
