Hi Marc, Understood … I’m just trying to understand why some I/O’s are flagged as metadata, while others are flagged as inode?!? Since this filesystem uses 512 byte inodes, there is no data content from any files involved (for a metadata only disk), correct? Thanks…
Kevin On Sep 11, 2018, at 9:12 AM, Marc A Kaplan <[email protected]<mailto:[email protected]>> wrote: Metadata is anything besides the data contents of your files. Inodes, directories, indirect blocks, allocation maps, log data ... are the biggies. Apparently, --iohist may sometimes distinguish some metadata as "inode", "logData", ... that doesn't mean those aren't metadata also. From: "Buterbaugh, Kevin L" <[email protected]<mailto:[email protected]>> To: gpfsug main discussion list <[email protected]<mailto:[email protected]>> Date: 09/10/2018 03:12 PM Subject: [gpfsug-discuss] RAID type for system pool Sent by: [email protected]<mailto:[email protected]> ________________________________ From: [email protected]<mailto:[email protected]> Subject: Re: [gpfsug-discuss] RAID type for system pool Date: September 10, 2018 at 11:35:05 AM CDT To: [email protected]<mailto:[email protected]> Hi All, So while I’m waiting for the purchase of new hardware to go thru, I’m trying to gather more data about the current workload. One of the things I’m trying to do is get a handle on the ratio of reads versus writes for my metadata. I’m using “mmdiag —iohist” … in this case “dm-12” is one of my metadataOnly disks and I’m running this on the primary NSD server for that NSD. I’m seeing output like: 11:22:13.931117 W inode 4:299844163 1 0.448 srv dm-12 <redacted> 11:22:13.932344 R metadata 4:36659676 4 0.307 srv dm-12 <redacted> 11:22:13.932005 W logData 4:49676176 1 0.726 srv dm-12 <redacted> And I’m confused as to the difference between “inode” and “metadata” (I at least _think_ I understand “logData”)?!? The man page for mmdiag doesn’t help and I’ve not found anything useful yet in my Googling. This is on a filesystem that currently uses 512 byte inodes, if that matters. Thanks… Kevin _______________________________________________ gpfsug-discuss mailing list gpfsug-discuss at spectrumscale.org<http://spectrumscale.org> http://gpfsug.org/mailman/listinfo/gpfsug-discuss<https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fgpfsug.org%2Fmailman%2Flistinfo%2Fgpfsug-discuss&data=02%7C01%7CKevin.Buterbaugh%40vanderbilt.edu%7C2dbbb1fe9f5a4b80aa6b08d617f0a664%7Cba5a7f39e3be4ab3b45067fa80faecad%7C0%7C0%7C636722719686349116&sdata=QfIeBZZ5%2Brpqqw1XL0cnIGqzswhtX3mYfJuTKSGpDEM%3D&reserved=0> _______________________________________________ gpfsug-discuss mailing list gpfsug-discuss at spectrumscale.org<http://spectrumscale.org> https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fgpfsug.org%2Fmailman%2Flistinfo%2Fgpfsug-discuss&data=02%7C01%7CKevin.Buterbaugh%40vanderbilt.edu%7C2dbbb1fe9f5a4b80aa6b08d617f0a664%7Cba5a7f39e3be4ab3b45067fa80faecad%7C0%7C0%7C636722719686369131&sdata=uOPawxUhx4Wvxja5%2FLvJJMpAHj3uRb0Q1eiogmRXGgw%3D&reserved=0
_______________________________________________ gpfsug-discuss mailing list gpfsug-discuss at spectrumscale.org http://gpfsug.org/mailman/listinfo/gpfsug-discuss
