HP 3PAR StoreServ 7000 Storage Troubleshooting Guide

LD Example 2
Component -------Description-------- Qty
LD LDs in write through mode 3
Component -Identifier-- --------Description---------
LD ld:Ten.usr.12 LD is in write-through mode
LD Suggested Action 2
Examine the identified LDs for failed or missing disks by using the following CLI commands:showld,
showld –d, showldch, and showpd. Write-through mode (WThru) indicates that host I/O
operations must be written through to the disk before the host I/O command is acknowledged.
This is usually due to a node-down condition, when node batteries are not working, or where disk
redundancy is not optimal.
cli% showld Ten*
Id Name RAID -Detailed_State- Own SizeMB UsedMB Use Lgct LgId
WThru
MapV
91 Ten.usr.3 0 normal 1/0/3/2 13824 0 V 0 --- N N
92 Ten.usr.12 0 normal 2/3/0/1 28672 0 V 0 --- Y N
cli% showldch Ten.usr.12
Ldch Row Set PdPos Pdid Pdch State Usage Media Sp From To
0 0 0 3:3:0 108 6 normal ld valid N --- ---
11 0 11 --- 104 74 normal ld valid N --- ---
cli% showpd 104
-Size(MB)-- ----Ports----
Id CagePos Type Speed(K) State Total Free A B
104 4:9:0? FC 15 failed 428800 0 ----- -----
LD Example 3
Component ---------Description--------- Qty
LD LDs with reduced availability 1
Component --Identifier-- ------------Description---------------
LD ld:R1.usr.0 LD has reduced availability. Current: ch, Configured: cage
LD Suggested Action 3
LDs are created with certain high-availability characteristics, such as ha-cage. Reduced availability
can occur if chunklets in an LD are moved to a location where the current availability (CAvail) is
below the desired level of availability (Avail). Chunklets may have been manually moved with
movech or by specifying it during a tune operation or during failure conditions such as node,
path, or cage failures. The HA levels from highest to lowest are port, cage, mag, and ch (disk).
Examine the identified LDs for failed or missing disks by using the following CLI commands: showld,
showld –d, showldch, and showpd. In the example below, the LD should have cage-level
availability, but it currently has chunklet (disk) level availability (the chunklets are on the same disk).
cli% showld -d R1.usr.0
Troubleshooting Storage System Components 37