HP 3PAR StoreServ 7450 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 using CLI commands such as showld, showld –d, showldch, and
showpd for any failed or missing disks. 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. If chunklets in an
LD get moved to locations where the Current Availability (CAvail) is not at least as good as the
desired level of availability (Avail), this condition is reported. 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).
Troubleshooting Storage System Components 39