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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 CENTOS

pmdazimbra

PMDAZIMBRA(1)						       Performance Co-Pilot						     PMDAZIMBRA(1)

NAME

       pmdazimbra - Zimbra Collaboration Suite (ZCS) PMDA

DESCRIPTION

       pmdazimbra is a Performance Metrics Domain Agent (PMDA) which exports metric values from several subsystems of the Zimbra Suite.  Further
       details on Zimbra can be found at http://www.zimbra.com/.

INSTALLATION

       If you want access to the names and values for the zimbra performance metrics, do the following as root:

	       # cd $PCP_PMDAS_DIR/zimbra
	       # ./Install

       If you want to undo the installation, do the following as root:

	       # cd $PCP_PMDAS_DIR/zimbra
	       # ./Remove

       pmdazimbra is launched by pmcd(1) and should never be executed directly.  The Install and Remove scripts notify pmcd(1) when the agent is
       installed or removed.

FILES

       /opt/zimbra/zmstat/*
	   comma-separated value files containing Zimbra performance data

       $PCP_PMDAS_DIR/zimbra/Install
	   installation script for the pmdazimbra agent

       $PCP_PMDAS_DIR/zimbra/Remove
	   undo installation script for the pmdazimbra agent

       $PCP_LOG_DIR/pmcd/zimbra.log
	   default log file for error messages from pmdazimbra

SEE ALSO

       pmcd(1).

3.8.10							       Performance Co-Pilot						     PMDAZIMBRA(1)
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