On Thu, May 01, 2014 at 07:50:11PM +0200, Hendrik Friedel wrote: > I have very high load when writing/reading from/to two of my btrfs volumes. > One sda1, mounted as /mnt/BTRFS, the other, sdd2/sde2 (raid) as / > sda1 is a 3TB disc, whereas the sdd2/sde2 are small SSDs of 16GB. > > I wrote a small script to demonstrate it. It does: > -echo what it will do > -show the current load > -dd from one volume to the other. > -show the current load > -sync and flush the cache > -sleep 300s in order to get the load down again.
load average is not a good metric, it mixes IO an CPU load into one number, would be better to measure cpu and IO loads separately. > Here the output: > Test from /mnt/BTRFS to /tmp > 124,553 s, 16,8 MB/s Is the transfer speed comparable if using a bare blockdevice instead of a filesystem on top of that? According to the S.M.A.R.T. stats the devices seem to be working normally. -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
