Asymmetric access status of disk arrays

The current asymmetric access status of your disk arrays can be easily accessed.

The current asymmetric access states of your disk arrays are displayed in the Status column of the Display Hardware Status screen (located under the main menu of iprconfig) and Display Disk Array Status screen (located under the menu option titled Work with disk arrays). An array can be in an Optimized state or an Active (non-optimized) state; see HA asymmetric access optimization.

IBM® SAS RAID controllers are in a pair in HA single- and two-system RAID configurations. A RAID array that is Active (non-optimized) on the primary adapter is Optimized on the secondary adapter, and vice versa. RAID arrays are optimized on one of the two IBM SAS RAID controllers unless an error is detected.

The status of array members can be used to determine if the RAID array is on the primary or secondary adapter. When an array member has a status of Active, it indicates the RAID array is on the primary adapter. When the status is Remote, it indicates the RAID array is on the secondary adapter.

In the sample Display Disk Array Status screen of the HA single-system configuration shown in the following screen, the RAID 5 array is shown as sdd and is Active (non-optimized) on the primary adapter, while on the secondary adapter it is shown as sdf and Optimized. The RAID 10 array is shown as sde and Optimized on the primary adapter, and sdg and Active (non-optimized) on the secondary adapter.

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|                            Display Disk Array Status                         |
|                                                                              |
|Type option, press Enter.                                                     |
|  1=Display hardware resource information details                             |
|                                                                              |
|OPT Name   PCI/SCSI Location          Description               Status        |
|--- ------ -------------------------- ------------------------- --------------|
|    sdd    0002:00:01.0/1:255:0:0     RAID 5 Disk Array         Active        |
|           0002:00:01.0/1:0:1:0         RAID 5 Array Member     Active        |
|           0002:00:01.0/1:0:2:0         RAID 5 Array Member     Active        |
|           0002:00:01.0/1:0:3:0         RAID 5 Array Member     Active        |
|    sde    0002:00:01.0/1:255:1:0     RAID 10 Disk Array        Optimized     |
|           0002:00:01.0/1:0:8:0         RAID 10 Array Member    Active        |
|           0002:00:01.0/1:0:9:0         RAID 10 Array Member    Active        |
|    sdh    0002:00:01.0/1:255:2:0     RAID 0 Disk Array         Optimized     |
|           0002:00:01.0/1:0:10:0        RAID 0 Array Member     Active        |
|           0002:00:01.0/1:0:11:0        RAID 0 Array Member     Active        |
|    sdf    0003:00:01.0/2:255:0:0     RAID 5 Disk Array         Optimized     |
|           0003:00:01.0/2:0:3:0         RAID 5 Array Member     Remote        |
|           0003:00:01.0/2:0:1:0         RAID 5 Array Member     Remote        |
|           0003:00:01.0/2:0:2:0         RAID 5 Array Member     Remote        |
|    sdg    0003:00:01.0/2:255:1:0     RAID 10 Disk Array        Active        |
|           0003:00:01.0/2:0:9:0         RAID 10 Array Member    Remote        |
|           0003:00:01.0/2:0:8:0         RAID 10 Array Member    Remote        |
|    sdi    0003:00:01.0/2:255:2:0     RAID 0 Disk Array         Active        |
|           0003:00:01.0/2:0:10:0        RAID 0 Array Member     Remote        |
|           0003:00:01.0/2:0:11:0        RAID 0 Array Member     Remote        |
|                                                                              |
|e=Exit   q=Cancel   r=Refresh   t=Toggle                                      |
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