Thanks for the help, see below: On Sat, Sep 3, 2016 at 11:41 AM, Mohammed Rafi K C <[email protected]> wrote:
> Files created before attaching hot tier will be present on hot brick until > it gets heated and migrated completely. During this time interval we won't > get the benefit of hot storage since the files are served from cold brick. > The issue I'm having is that when the hot tier is added read from the volume drops from 150MB/s (no tier) to 2-10MB/s (tier added). I experienced this issue for a while even after the hot brick reached 90% capacity, so many files were promoted. I detached the hotbrick and verified there weren't any files left over, and the performance was still effected. It was only until I committed the detach that throughput returned to 150MB/s. Reattaching the hot tier immediately caused the issue to return until the tier was again detach-committed > > > For smallfiles (order of kbs), We are experiencing some performance issue > mostly with EC (disperse ) volume. > > Follow up questions, > What is the volume type ? and version of glusterfs ? > The volume is a 2x replica on btrfs bricks that are luks encrypted. 2048K GPT offset for 1st partition . Gluster 3.8.3, built aug 22 running on Centos. > > Does reread gives an equal performance when it hits the server ? > reading any files with hot tier results in 2-10MB/s (node mounted volume > via localhost6:/volume), reading them again any number of times does not > improve performance > > Have you done any rename for those files ? > Some files have been renamed, however the 10GB test file has not it is the original name/copy
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