DataDirect Networks S2A9550, User Manual

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Installation
24
DataDirect Networks S2A 9550 User Guide
The health indication for the spare channel under the ' Healthy Disks ' heading is an
indication of the health of the spare disk (if any) which is currently being used to replace
a disk on the listed tier.
The health indication for the spare channel that is physically on the listed tier is found
under the '
Sp H ' heading.
' F ' indicates the failed disk (if any) on the tier.
' R ' indicates the replaced disk (if any) on the tier.
' Sp H ' indicates if the spare disk that is physically on the tier is healthy.
' Sp A ' indicates if the spare disk that is physically on the tier is available for use as a
replacement.
' Spare Owner ' indicates the current owner of the physical spare, where ownership is
assigned when the spare is used as a replacement.
' RES-# ' will appear under the Spare Owner heading while a replacement operation is
underway to indicate that unit '#'currently has the spare reserved.
' Spare Used on ' indicates the tier (if any) on which this physical spare is being used as
a replacement.
' Repl Spare from ' indicates the tier (if any) whose spare disk is being used as a
replacement on this tier.
NOTE : Tiers are 8+1 mode by default.
2.3.9 Cache Coherency and Labeling in Dual Mode
Use the
DUAL
command to check status of the units are healthy and verify the “Dual”
(COM 2) and “Ethernet” (S2A LINK) communication paths between the two units are
established
(Figure 2-9)
.
If you require multi-pathing to the LUNs, enable cache coherency. If you do not require
multi-pathing, disable cache coherency. To enable/disable the cache coherency function,
use the command:
DUAL COHERENCY=ON|OFF
<Enter>
You may change the label assigned to each S2A unit. This allows you to uniquely identify
each unit in the S2A system. Each S2A can have a label up to 31 characters long. To
change the label:
1.
Use the command,
DUAL LABEL
<Enter>
2.
Select which unit you want to rename
(Figure 2-10)
.
Dual S2A Configuration
S2A 1
Figure 2-9 Dual S2A9550 Configuration Screen
S2A [1]: dual
S2A 2
Status Healthy Healthy
Dual communication: established.
----------------------------------------------------------------------
Ethernet communication: established.
Cache coherency: Not established.
Cache coherency timeout: 2
Label S2A Unit[1] S2A Unit[2]