Users Guide

Logging In to and Out of Smart Copies.............................................................................................................................91
Logging In to a Smart Copy.......................................................................................................................................... 91
Logging Out of a Smart Copy......................................................................................................................................92
Creating and Managing Collections.................................................................................................................................. 93
Creating a Collection..................................................................................................................................................... 93
Listing Collections..........................................................................................................................................................94
Updating a Collection....................................................................................................................................................95
Deleting a Collection......................................................................................................................................................96
7 Managing Thin-Provisioned Volumes............................................................................................ 97
About Thin-Provisioning..................................................................................................................................................... 97
Realtime Thin-Provisioning........................................................................................................................................... 97
On-Demand Thin-Provisioning ....................................................................................................................................98
Thin-Provisioning as Scheduled Maintenance........................................................................................................... 98
Group Access Files........................................................................................................................................................ 99
Considerations for Thin-Provisioning................................................................................................................................99
File System and Volume Characteristics.................................................................................................................... 99
Multiple File Systems.................................................................................................................................................... 99
Volume Thin-Provisioning Configuration Parameters................................................................................................... 100
Show Mount Point Information........................................................................................................................................100
eqlvolume show Command Syntax............................................................................................................................ 101
Examples: Showing Mount Point Information...........................................................................................................101
Thin-Provisioning a Volume.............................................................................................................................................. 102
eqlvolume rethin Command Syntax...........................................................................................................................103
Examples: Analyzing Thin—Provisioning Recommendations.................................................................................103
8 Troubleshooting........................................................................................................................105
General Troubleshooting Guidelines................................................................................................................................ 105
Ensuring Correct Operation of the dm-switch Kernel Module ............................................................................. 105
Establishing iSCSI Sessions........................................................................................................................................ 105
Increasing the Volume Size on a PS Series Group.................................................................................................. 105
Logical Volume Manager (LVM) Considerations..................................................................................................... 106
Using the eqllog Facility.....................................................................................................................................................108
Command Syntax.........................................................................................................................................................108
Example: eqllog Output............................................................................................................................................... 108
Using the udev Facility...................................................................................................................................................... 109
Using the ehcmcli Diagnostic Tool....................................................................................................................................110
ehcmcli Command Syntax........................................................................................................................................... 110
ehcmcli Diagnostic Output........................................................................................................................................... 111
Running the ehcmd Daemon ............................................................................................................................................112
Considerations When Partitioning iSCSI Volumes..........................................................................................................113
A Migrating to HIT Linux Multipath I/O.......................................................................................... 114
Before You Begin ............................................................................................................................................................... 114
Step 1: Install HIT Linux in Migration Mode .................................................................................................................... 114
Step 2: Migrate Existing Storage-Using Applications ................................................................................................... 115
Logical Volume Manager Considerations...................................................................................................................115
Directly Mounted File Systems................................................................................................................................... 115
Step 3: Reconfigure multipathd........................................................................................................................................116
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