Users Guide

user_friendly_names "yes"
alias_prex "mpath-sperc"
features "0"
fast_io_fail_tmo 5
}
}
blacklist {
wwid "<WWID of OS VD>"
}
Clustering setup in Linux
• When conguring STONITH sbd devices, ensure that the Message Timeout is set to 120 seconds and the Watchdog Timer is set to at
least 60 seconds. This is to ensure that the SPERC controller functions correctly.
General recommendations for Multipath setup in a Linux
environment
• Additional information can be obtained at the following links:
• https://www.suse.com/documentation/sles11/singlehtml/stor_admin/stor_admin.html#multipathing
• https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/pdf/DM_Multipath/Red_Hat_Enterprise_Linux-7-
DM_Multipath-en-US.pdf
• https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html-single/DM_Multipath/
• Dell recommends that you use user-friendly names (/dev/mapper/mpathx instead of /dev/dm-n). The latter is intended for internal use
only.
• In some cases, it may be desired that the multipath module not be used to aggregate local or USB disks. For these devices, the
following steps can be used to blacklist them from device-mapper:
a Use /lib/udev/scsi_id –g –u /dev/sdx to nd the wwid of the local disk
Example:
/lib/udev/scsi_id –g –u /dev/sda
36d4ae52092e175001ab9d33c2941385a [Local Disk wwid]
b Modify the multi path.conf le provided and black list the wwid of all local disks from above
Example:
blacklist {
wwid "36d4ae52092e175001ab9d33c2941385a"
}
Multipath and clustering setup
47