[gpfsug-discuss] What is an independent fileset? was: mmbackup with fileset : scope errors

[Sobey, Richard A]

Thanks, I was just about to post that, and I guess is still the reason a dependent fileset is still the default without the –inode-space new option fileset creation.

I do wonder why there is a limit of 1000, whether it’s just IBM not envisaging any customer needing more than that? We’ve only got 414 at the moment but that will grow to over 500 this year.

Richard

From: gpfsug-discuss-bounces at spectrumscale.org [mailto:gpfsug-discuss-bounces at spectrumscale.org] On Behalf Of David D. Johnson
Sent: 18 May 2017 15:24
To: gpfsug main discussion list <gpfsug-discuss at spectrumscale.org>
Subject: Re: [gpfsug-discuss] What is an independent fileset? was: mmbackup with fileset : scope errors

Here is one big reason independent filesets are problematic:
A5.13:
Table 43. Maximum number of filesets

Version of GPFS

Maximum Number of Dependent Filesets

Maximum Number of Independent Filesets

IBM Spectrum Scale V4

10,000

1,000

GPFS V3.5

10,000

1,000

Another is that each independent fileset must be sized (and resized) for the number of inodes it is expected to contain.
If that runs out (due to growth or a runaway user job), new files cannot be created until the inode limit is bumped up.
This is true of the root namespace as well, but there’s only one number to watch per filesystem.

 — ddj
Dave Johnson
Brown University
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