On 2012-03-23 05:53, Sebastian Melchior wrote:
Hi, we already used iostat and iotop during times of the slowdown, there is no sudden drop in I/O workload in the times of the slowdown. Also the iowait does not spike and stays as before. So i do not think that this is I/O related. As the disks are SSDs there also still is some "head room" left.
I've seen a ssd completely lock up for a dozen seconds or so after giving it a smartctl command to trim a section of the disk. I'm not sure if that was the vertex 2 pro disk I was testing or the intel 710, but enough reason for us to not mount filesystems with -o discard.
regards, Yeb -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
