That isn't necessarily true. The ONLY way to ensure you aren't saving
tiny little <~400 byte files is to have encryption enabled with the
advanced license. There are QUITE a few types of MD that can be saved,
just look at the output from a file using mmlsattr -L...
Ed
On 09/11/2018 11:48 AM, Buterbaugh, Kevin L wrote:
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
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