Hi All, I am still working on my issue of the occasional high I/O wait times and that has raised another question … I know that I can run mmfileid to see what files have a block on a given NSD, but is there a way to do the opposite? I.e. I want to know what NSDs a single file has its’ blocks on? The mmlsattr command does not appear to show this information unless it’s got an undocumented option. Thanks… Kevin — Kevin Buterbaugh - Senior System Administrator Vanderbilt University - Advanced Computing Center for Research and Education Kevin.Buterbaugh at vanderbilt.edu<mailto:Kevin.Buterbaugh at vanderbilt.edu> - (615)875-9633 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://gpfsug.org/pipermail/gpfsug-discuss_gpfsug.org/attachments/20180709/6bfb5a11/attachment.html>