FQXST0495W : The algorithm for best-path routing selected the alternate path to the specified disk because the I/O error count on the primary path reached its threshold.

Severity​

Critical

Serviceable with log​

No

Automatically Notify Support​

No

User Action​

• If this event is consistently logged for only one disk in an enclosure, perform the following actions:
  1. Replace the disk.
  2. If that does not resolve the problem, the fault is probably in the enclosure midplane. Replace the chassis FRU for the specified enclosure.
• If this event is logged for more than one disk in an enclosure or disks in multiple enclosures, perform the following actions:
  1. Check for disconnected SAS cables in the bad path. If no cables are disconnected, replace the cable connecting to the ingress port in the most-upstream enclosure with reported failures. If that does not resolve the problem, replace other cables in the bad path, one at a time until the problem is resolved.
  2. Replace the expansion modules that are in the bad path. Begin with the most-upstream module that is in an enclosure with reported failures. If that does not resolve the problem, replace other expansion modules (and the controller module) upstream of the affected enclosure(s), one at a time until the problem is resolved.
  3. If that does not resolve the problem, the fault is probably in the enclosure midplane. Replace the chassis FRU of the most-upstream enclosure with reported failures. If that does not resolve the problem and there is more than one enclosure with reported failures, replace the chassis FRU of the other enclosures with reported failures until the problem is resolved.