[gpfsug-discuss] RAID type for system pool
Buterbaugh, Kevin L
Kevin.Buterbaugh at Vanderbilt.Edu
Mon Sep 10 19:26:34 BST 2018
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
—
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
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