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
6
Contents