Users Guide

• 11-eqlenv.rules
This udev rule file sets up important environment variables and symlinks used by ehcmd and in other udev rule files.
• 38-equallogic.rules
These udev rules should serve as a guide for setting up systemwide udev rules for EqualLogic storage devices, and demonstrate how
this setup can be done by setting the readahead value for all EqualLogic devices to 1024kb. You can copy this file to /etc/udev/
rules.d/39-eql_user.rules for customization.
• 99-eqlsd.rules
Set the SCSI subsystem device timeout to 60 seconds for every Dell EqualLogic iSCSI session. This rule file applies only to the
individual SD devices. Any other block-layer tuning done here will be bypassed by the top-level DM devices built by ehcmd. To tune
those devices, see the information for the 38-equallogic.rules file.
A number of distribution-specific files might be required to work with other distribution-specific udev rules, such as 64-eqllvm.rules
or 89-eqlfinal.rules. These files are identified by a -eql prefix ( ??-eql*.rules), and contain internal comments that explain
their function and purpose.
Using the ehcmcli Diagnostic Tool
The ehcmcli diagnostic tool reports the diagnostic state of the EqualLogic Host Connection Manager (ehcmd) and multipath device
information. When entering ehcmcli commands, Bash command completion lets you type part of a command followed by a single
horizontal tab, which completes the command. For more information, see Appendix C Bash Command Completion.
ehcmcli Command Syntax
The command syntax is as follows:
ehcmcli [subcommand-1] [subcommand-2] [options] [argument]
help [subcommand]
dm create
dm cleanup
dm unload switch
login --target target | -T
[--portal IP-address-or-name | -p]
[--hidden]
[--login-at-boot | --no-login-at-boot]
logout --target target | -T]
[--no-login-at-boot]
pr init --key key-name
pr remove --key key-name
pr status [--verbose]
status [--verbose]
The following table describes the commands and options for the ehcmcli tool.
Table 43. ehcmcli Commands and Options
Subcommands Options Argument Description
Required
login
--target | -T
--portal | -p
--hidden
--login-at-boot
--no-login-at-boot
target IP address or
name
Specifies --target to log in to one session to the
specified PS Series group.
Optional. Use --portal to provide the iSCSI portal IP
address or name to log in if target is not already
discovered on the system.
Optional. Use --hidden to treat the login as a hidden
ASM device.
Optional. Use either --login-at-boot to set the
node.startup values for the target to perform the login
at the next reboot, or --no-login-at-boot to set the
values to not perform the login at the next reboot.
110 Troubleshooting