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Full Discussion: IBM AIX I/O Performance Tuning
Operating Systems AIX IBM AIX I/O Performance Tuning Post 303031400 by bakunin on Wednesday 27th of February 2019 10:09:27 PM
Old 02-27-2019
There are two things i noticed which might affect performance negatively:

Quote:
Originally Posted by c3rb3rus
Code:
# lsattr -l fcs0 -E
max_xfer_size 0x100000   Maximum Transfer Size                              True

You can increase this to help especially larger transfers. Use the -R switch of lsattr to see legal values you can use.

These two:
Quote:
Originally Posted by c3rb3rus
Code:
# lsattr -El hdisk2
algorithm       fail_over                                           Algorithm                        True+
reserve_policy  single_path                                         Reserve Policy                   True+

are also not optimal. Basically the multipath drivers (can) use multiple pathes (FC connections from the LUN to the system) at once. These multiple pathes can be used for two purposes: the first is redundancy, so that if one connection fails it uses another. Connection failure - temporarily - happens rather frequently for reasons i don't fully understand in FC-connections. The other purpose multiple pathes can be used to is performance: using several pathes in parallel speeds things up. This is basically controlled by using the "algorithm" property. I have no test system at hand to tell you the value you need to use but there are only two of them and you need the other one - again, use the lsattr -R switch to list all legal values for the property.

The reserve_policy should be "no_reserve" but this matters mostly in clusters where disks are accessed from several systems at once.

I hope this helps.

bakunin
 

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LEARN ABOUT HPUX

lsattr

LSATTR(1)						      General Commands Manual							 LSATTR(1)

NAME

       lsattr - list file attributes on a Linux second extended file system

SYNOPSIS

       lsattr [ -RVadlpv ] [ files...  ]

DESCRIPTION

       lsattr lists the file attributes on a second extended file system.  See chattr(1) for a description of the attributes and what they mean.

OPTIONS

       -R     Recursively list attributes of directories and their contents.

       -V     Display the program version.

       -a     List all files in directories, including files that start with `.'.

       -d     List directories like other files, rather than listing their contents.

       -l     Print the options using long names instead of single character abbreviations.

       -p     List the file's project number.

       -v     List the file's version/generation number.

AUTHOR

       lsattr was written by Remy Card <Remy.Card@linux.org>.  It is currently being maintained by Theodore Ts'o <tytso@alum.mit.edu>.

BUGS

       There are none :-).

AVAILABILITY

       lsattr is part of the e2fsprogs package and is available from http://e2fsprogs.sourceforge.net.

SEE ALSO

       chattr(1)

E2fsprogs version 1.44.1					    March 2018								 LSATTR(1)
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