[LU-2375] MDS RPC stats should be under /proc/fs/lustre/mds

Fri, 8 Oct 2021 23:42:28 +0000

In ~~LU-718~~ the MDS RPC service handling is being modified to be independent of the MDT devices.

However, the current /proc files for the MDS RPC services are located under the target directory /proc/fs/lustre/mdt/

{fsname}

-MDT0000/

{mdt,mdt_*}

, but they do not relate to the target, but are instead node-wide RPC service thread statistics. They should properly be under /proc/fs/lustre/mds and/or /proc/fs/lustre/mdt/MDS/ (as they were in 1.8).

It wouldn't be a terrible idea to rename some of the service ports from their current names of "mdt_mdss", "mdt_mdsc", "mdt_fld", etc to match the 1.8 names ("mds", "mds_readpage", "mds_setattr") since they are properly "MDS" statistics. However, there may be compatibility issues that prevent renaming all of these files immediately. Creating symlinks is useful for transitioning to a new naming scheme in the future.

I've already submitted http://review.whamcloud.com/4618 to link the OSS statistics under /proc/fs/lustre/oss from their current location in /proc/fs/lustre/ost/OSS/.

Whamcloud Community JIRA

[LU-2375] MDS RPC stats should be under /proc/fs/lustre/mds