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2.3.6 Checking Tier Status and Configuration
Use the tier command to display your current tier status. Figure 2–5 illustrates the status of a system
containing 80 drives on 8 tiers with both parity modes of 8+1 and 8+2 tiers. The plus sign (+) adjacent
to the tier number indicates that the tier is in 8+2 mode.
Figure 2–5 Tier Status Screen
Each letter under the “Disk Status” column represents a healthy drive at that channel (as shown in Figure
2–5). Verify that all drives can be seen by the controller.
“Unhealthy” drives appear as follows:
• A blank space indicates that the drive is not present (or detected) at that location.
• A period (.) denotes that the disk was failed by the system.
• A question mark (?) indicates that the disk has failed the diagnostics tests or is not configured
correctly.
• The character “r” indicates that the disk at that location is being replaced by a spare drive.
After entering the tier command, perform the following steps if necessary:
1. If a drive is not displayed at all (that is, it is “missing”), check to ensure that the drive is properly
seated and in good condition. To search for the drive, enter:
disk scan
<Enter>
2. If the same channel is missing on all tiers, check the cable connections for that channel.
3. If “automatic disk rebuilding” is not enabled, enable it by entering:
tier autorebuild=on
<Enter>
4. To display the detailed disk configuration information for all of the tiers (Figure 2–6) enter:
tier config
<Enter>
Tier Status
Space Available
(Mbytes)Tier Disk Status Lun List
Capacity
(Mbytes)
ABCDEFGHPS
-----------------------------------------------------------------
280012280012 1 +
ABCD FGHPS2800122800122
ABCDEFGHPS2800122800123
Automatic disk rebuilding is Enabled
15000 [1]: tier
ABCDEFGHPS2800122800124
AB.DEFGHPS2800122800125
System rebuild extend: 32 Mbytes
System rebuild delay: 60
System Capacity 2240096 Mbytes, 2240096 Mbytes available.
Owner
1
1
1
1
1
ABCDEFGHPS280012280012 6 + 1
ABCDEFG?PS2800122800127 1
ABCDEFGHPS280012280012 8 + 1