[gpfsug-discuss] gpfsug-discuss Digest, Vol 87, Issue 21

[IBM Spectrum Scale]

From my understanding, your interpretation is correct.


Regards, The Spectrum Scale (GPFS) team

------------------------------------------------------------------------------------------------------------------

If you feel that your question can benefit other users of  Spectrum Scale
(GPFS), then please post it to the public IBM developerWroks Forum at
https://www.ibm.com/developerworks/community/forums/html/forum?id=11111111-0000-0000-0000-000000000479.


If your query concerns a potential software error in Spectrum Scale (GPFS)
and you have an IBM software maintenance contract please contact
1-800-237-5511 in the United States or your local IBM Service Center in
other countries.

The forum is informally monitored as time permits and should not be used
for priority messages to the Spectrum Scale (GPFS) team.



From:	Prasad Surampudi <prasad.surampudi at theatsgroup.com>
To:	"gpfsug-discuss at spectrumscale.org"
            <gpfsug-discuss at spectrumscale.org>
Date:	04/24/2019 12:17 AM
Subject:	Re: [gpfsug-discuss] gpfsug-discuss Digest, Vol 87, Issue 21
Sent by:	gpfsug-discuss-bounces at spectrumscale.org




I am trying to analyze a filehist report of a Spectrum Scale filesystem I
recently collected. Given below is the data and I have put my
interpretation in parentheses. Could someone from Sale development review
and let me know if my interpretation is correct? Filesystem block size is
16 MB and system pool block size is 256 KB.

                 GPFS Filehist report for Test Filesystem

All: Files                    =       38,808,641 (38 Million Total Files)
All: Files in inodes          =        8153748
Available space               = 1550139596472320     1550140 GB        1550
TB
Total Size of files           = 1110707126790022
Total Size of files in inodes =    26008177568
Total Space                   = 1123175375306752     1123175 GB        1123
TB
Largest File                  =  3070145200128 -  ( 2.8 TB)
Average Size                  =       28620098 – ( 27 MB )
Non-zero: Files               =       38642491
Average NZ size               =       28743155
Directories                   =         687233 (Total Number of
Directories)
Directories in inode          =         650552
Total Dir Space               =     5988433920
Avg Entries per dir           =           57.5 (Avg # files per Directory)
Files with indirect blocks    =         181003
File%ile represents the cummulative percentage of files.
Space%ile represents the cummulative percentage of total space used.
AvlSpc%ile represents the cummulative percentage used of total available
space.

Histogram of files <= one 16M block in size
Subblocks    Count  File%ile  Space%ile   AvlSpc%ile
--------- -------- ---------- ----------  ----------
        0  7,669,346     19.76%      0.00%       0.00% ( ~7 Million files
<= 512 KB )
        1 25,548,588     85.59%      1.19%       0.86% - ( ~25 Million
files > 512 KB <= 1 MB )
        2  1,270,115     88.87%      1.31%       0.95% - (~1 Million files
> 1 MB <= 1.5 MB )



....
....
....

       32    10387     97.37%      2.43%       1.76%


Histogram of files with N 16M blocks (plus end fragment)
   Blocks    Count  File%ile  Space%ile   AvlSpc%ile
--------- -------- ---------- ----------  ----------
        1   177550     97.82%      2.70%       1.95% ( ~177 K files <= 16
MB)


....
....
....
      100      640     99.77%     17.31%      12.54%
Number of files with more than 100 16M blocks
     101+    88121    100.00%    100.00%      72.46% ( ~88 K files > 1600
MB)




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