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
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