HP 3PAR StoreServ 7450 4-node HP 3PAR StoreServ 7450 Storage Troubleshooting G - Page 39

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 --- 92 Ten.usr.12 0 normal 2/3/0/1 28672 0 V 0 --- N N 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