Last updated on SEPTEMBER 08, 2016
Applies to:Sun Storage Traffic Manager Software - Version 4.4 and later
This is the problem and symptom.
fcp_offline_delay is a variable used by the driver fcp to delay (by the value set in this timer) the offline of the LUNs when the target port disappears. The default value for fcp_offline_delay is 20 sec but depending on the hardware configuration and version of SAN Foundation Kit, this variable might be set incorrectly and this might lead to premature LUN offline if a target port disappears momentarily.
Here is a typical signature of this problem:
Aug 1 22:31:08 v4u-v490d-gmp03 fctl: [ID 517869 kern.warning] WARNING: 54=>fp(1)::GPN_ID for D_ID=10400 failed
Aug 1 22:31:08 v4u-v490d-gmp03 fctl: [ID 517869 kern.warning] WARNING: 55=>fp(1)::N_x Port with D_ID=10400, PWWN=201800a0b811fbc8 disappeared from fabric
The above event confirms that the target port with WWPN (World Wide Port Name) 201800a0b811fbc8 disappeared from the fabric. There are other reasons this can happen too (instead of the fcp_offline_delay value discussed in this document), this can be a target port reset, someone that disconnected the FC cable between the storage and the switch.
Here are some possible reasons this can occur:
Migrating to the usage of the SFK (San Foundation Kit) mpxio stack or a SAN based boot environment. Updating or changing end device or switch firmware while using SFK. Adding a new disk array while using SFK. Changing firmware properties on an existing disk array.
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