Before Tuning - IBM SAN768B-2 User Manual

Note: Some CRC errors may be acceptable without impact to application
performance. The recommended threshold for tuning is if there are about 100 CRC
with good EOF errors per 24 hours. If the error rate is extreme such as 50 errors
per minute or 100 per hour, call IBM Support for additional troubleshooting.

Before tuning

Additional SAN384B-2 and SAN768B-2 tuning must be performed by support.
Prior to calling support, complete the following steps.
Step #1 – Power cycle the core blade
If the problem was found on a core blade, attempt to power cycle the core blade. If
the problem was found on a port blade, power cycle each core blade one at a time.
Make sure that the first core blade that is power cycled is fully operational before
power cycling the second core blade. You can also wait to check if issues recur
before power cycling the second core blade.
The recommended method of power cycling the core blade is by sliding the black
slider switch with the power symbol down to the off position to initiate a
hot-swap request. Make sure that the power LED on the core blade has gone off
for one minute and then re-slide the black slider switch back up to the on position.
If physical access to the box is not possible, the core blades can be power cycled
using a CLI command. However, some frame loss can be expected when using the
CLI commands to power cycle the core blade.
The following CLI commands can be used to power cycle the core blade (caution:
frame drops can occur):
slotpoweroff -d626 <slot #>
slotpoweron -d626 <slot #>
Note: The slotpoweroff -d626 <slot #> and slotpoweron -d626 <slot #> commands
require root permissions.
To check whether a core blade is fully operational you can use the slotshow
command and verify that the status of the core blade displays as "ENABLED". An
example of power cycling a core blade in slot 3 in an IBM SAN384B-2 is shown
below.
SAN384B-2:FID128:admin> slotshow
Slot Blade Type
-----------------------------------
1 AP BLADE
2 UNKNOWN
3 CORE BLADE
4 CP BLADE
5 CP BLADE
6 CORE BLADE
7 UNKNOWN
8 SW BLADE
SAN384B-2:FID128:admin> slotpoweroff -d626 3
Slot 3 is being powered off
SAN384-2:FID128:admin> slotshow
Slot Blade Type
-----------------------------------
1 AP BLADE
ID Status
75 ENABLED
VACANT
99 ENABLED
50 ENABLED
50 ENABLED
99 ENABLED
VACANT
96 ENABLED
ID Status
75 ENABLED
Appendix D. Tuning the system
171