Getting EqualLogic to work with Ovirt

One thing to change is the path_checker in /etc/multipath.conf.   There is a bug in Multipathd, that shows itself with the EQL 7.0 firmware, since that's 4K sector capable.  When using readsector0 it causes a protocol error right after login.  Change readsector0 to 'tur' or 'directio'

This is what I typically use for EQL in /etc/multipath.conf

defaults {

       udev_dir                /dev

       polling_interval        10

       path_selector           "round-robin 0"

       path_grouping_policy    multibus

       getuid_callout          "/lib/udev/scsi_id --whitelisted --device=/dev/%n"

       path_checker            tur

       rr_min_io               10

       max_fds                 8192

       rr_weight               priorities

       failback                immediate

       no_path_retry           fail

       user_friendly_names     yes

}

Also make sure that the interface file has both iSCSI_ifacename and net_ifacename

cat /var/lib/iscsi/ifaces/eth0

# BEGIN RECORD 6.2.0-873.2.el6

iface.iscsi_ifacename = eth0

iface.net_ifacename = eth0

iface.transport_name = tcp

iface.vlan_id = 0

iface.vlan_priority = 0

iface.iface_num = 0

iface.mtu = 0

iface.port = 0

# END RECORD

A couple of common tweaks to /etc/iscsid/iscsid.conf

################################

# session and device queue depth

################################

# To control how many commands the session will queue set

# node.session.cmds_max to an integer between 2 and 2048 that is also

# a power of 2. The default is 128.

node.session.cmds_max = 1024

# To control the device's queue depth set node.session.queue_depth

# to a value between 1 and 1024. The default is 32.

node.session.queue_depth = 128

node.session.iscsi.FastAbort = No

Regards,