[gpfsug-discuss] 4.2.3.x and sub-block size

[Kumaran Rajaram]

Hi,

>>Back at SC16 I was told that GPFS 4.2.3.x would remove the “a sub-block 
is 1/32nd of the block size” restriction.  However, I have installed GPFS 
4.2.3.1 on my test cluster and in the man page for mmcrfs I still see:
>>So has the restriction been removed?  If not, is there an update on 
which version of GPFS will remove it?  If so, can the documentation be 
updated to reflect the change and how to take advantage of it?  Thanks…

Based on the current plan, this “a sub-block is 1/32nd of the block size” 
restriction will be removed in the upcoming GPFS version 4.2.4 (Please 
NOTE: Support for >32 subblocks per block may subject to be delayed based 
on internal qualification/validation efforts).

Regards,
-Kums





From:   "Buterbaugh, Kevin L" <Kevin.Buterbaugh at Vanderbilt.Edu>
To:     gpfsug main discussion list <gpfsug-discuss at spectrumscale.org>
Date:   06/14/2017 12:12 PM
Subject:        [gpfsug-discuss] 4.2.3.x and sub-block size
Sent by:        gpfsug-discuss-bounces at spectrumscale.org



Hi All, 

Back at SC16 I was told that GPFS 4.2.3.x would remove the “a sub-block is 
1/32nd of the block size” restriction.  However, I have installed GPFS 
4.2.3.1 on my test cluster and in the man page for mmcrfs I still see:

2. The GPFS block size determines:

   *  The minimum disk space allocation unit. The minimum amount
      of space that file data can occupy is a sub‐block. A
      sub‐block is 1/32 of the block size.

So has the restriction been removed?  If not, is there an update on which 
version of GPFS will remove it?  If so, can the documentation be updated 
to reflect the change and how to take advantage of it?  Thanks…

Kevin

?
Kevin Buterbaugh - Senior System Administrator
Vanderbilt University - Advanced Computing Center for Research and 
Education
Kevin.Buterbaugh at vanderbilt.edu - (615)875-9633


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