01-05-2018
Not an AIX export but you could try to...
1. Failover a path to working path only (is possible dunno in aix, probably is).
2. Change the cable for faulty path.
I've debuged HPUX boxes with 'bad' cables experiencing exactly the same issues, long IO waits.
As i failed over to healthy path via scsimgr the machine got back to life.
Initially, the boot time was 20/30 minutes, dropped to normal after path switch.
This was VPAR on FC disk.
At the end i went to system room, pulled the 20 M fibre cable across data center to replace/diagnose the faulty cable.
Everything worked well, so the bad cable was replaced properly afterward.
Probably a factory error or someone damaged the cable during installation.
Of course, check the storage side and FC port switch to which the server is connected.
Hope that helps
Regards
Peasant.
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RD(9F) Kernel Functions for Drivers RD(9F)
NAME
RD, rd - get pointer to the read queue
SYNOPSIS
#include <sys/stream.h>
#include <sys/ddi.h>
queue_t *RD(queue_t *q);
INTERFACE LEVEL
Architecture independent level 1 (DDI/DKI).
PARAMETERS
q Pointer to the write queue whose read queue is to be returned.
DESCRIPTION
The RD() function accepts a write queue pointer as an argument and returns a pointer to the read queue of the same module.
CAUTION: Make sure the argument to this function is a pointer to a write queue. RD() will not check for queue type, and a system panic
could result if it is not the right type.
RETURN VALUES
The pointer to the read queue.
CONTEXT
RD() can be called from user or interrupt context.
EXAMPLES
Example 1: Function page reference
See the qreply(9F) function page for an example of RD().
SEE ALSO
qreply(9F), WR(9F)
Writing Device Drivers
STREAMS Programming Guide
SunOS 5.10 15 Nov 1991 RD(9F)