NetApp DiskShelf14mk2 FC, Hardware And Service Manual

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Appendix A: Hot-adding a Disk Shelf to an Existing System 55
A
Hot-adding a Disk Shelf to an Existing System
About this appendix
This appendix provides information about how to hot-add a DS14mk2 FC/
DS14mk4 FC to an existing system. It also tabulates the error messages that
appear on your system console if the attempt at hot-adding was unsuccessful.
Note
Only hot-add disk shelves that your system supports.
NetApp recommends that you hot-add one disk shelf at a time.
Attention
Failure to follow this recommendation may cause the loop to crash.
Error messages
The following error messages appear on your system console if your attempt at
hot-adding the DS14mk2 FC is unsuccessful.
For detailed
information
For detailed information about hot-adding a disk shelf, see the following topics:
◆
“ Hot-adding a disk shelf to an existing loop ” on page 57
Error message Explanation
Speed mismatch
termination
The modules on the disk shelf detected a speed
mismatch between the preceding disk shelf and this disk
shelf and is reporting them as automatic terminate errors.
Open loop panic One of three reasons cause this error message to appear:
◆
The shelf-to-shelf cable between the now second-to-
last disk shelf and the newly added disk shelf is
defective or is not securely fastened.
◆
The speed of the newly added DS14mk2 FC/
DS14mk4 FC disk shelf is incorrectly set.
Soft address
panic
One of two reasons cause this error message to appear:
◆
There is an invalid disk shelf ID.
◆
The power was turned on before the disk shelf ID
was changed and the disk shelf was not power-
cycled after the disk shelf ID was changed.