Hello Everybody …
Sometimes for performance recommendations or redundancy solutions, you will need to change some parameters on fibre card, like fc_err_recov & dyntrk
TEST_SERVER#lsattr -El fscsi0 attach none How this adapter is CONNECTED False dyntrk yes Dynamic Tracking of FC Devices True+ fc_err_recov delayed FC Fabric Event Error RECOVERY Policy True+ scsi_id Adapter SCSI ID False sw_fc_class 3 FC Class for Fabric True <span id="more-2155"></span>
to change these parameters, you need to run the following commands (will need system reboot):
chdev -l fscsi0 -a fc_err_recov=fast_fail -P chdev -l fscsi0 -a dyntrk=yes -P
Flag “-P” to activate it after system reboot
The Main problem on the previous steps if you need for any reason to remove the fibre card and make a “cfgmgr” again all fibre parameters will be reset because the system will reload the values from ODM.
anyway, we need to change the default values on ODM, so we will use the following commands:
chdef -a dyntrk=yes -c driver -s iocb -t efscsi chdef -a fc_err_recov=fast_fail -c driver -s iocb -t efscsi
where, -a is the attribute, -c is the Class , -s is the subclass, -t is the type.
“chdef” will change the default values on ODM, even you remove the card and make a “cfgmgr”
if you don’t know the class,subclass and type of your card, you can use the following command:
TEST_SERVER#lsdev -C -H -S a -F 'name class subclass type' |grep -i fscs fscsi0 driver iocb efscsi fscsi1 driver iocb efscsi fscsi2 driver iocb efscsi fscsi3 driver iocb efscsi
Note: This Topic is tested on AIX 6.1 & 7.1 on a system with fibre redundancy.