Owners Manual

For more information, see the Deployment Guide at www.access.redhat.com/documentation. This issue is xed in
Red Hat Enterprise Linux 6.5.
Cause This issue occurs because the Network Manager is used to congure the network.
Red Hat Enterprise Linux 6.4 installation on 10 GB iSCSI LUN
from an EQL array hangs while creating a le system
Description Installing Red Hat Enterprise Linux 6.4 on 10 GB iSCSI LUN from an EQL array hangs while creating a le system.
This issue also occurs on data LUN.
Workaround This issue issue is xed in Red Hat Enterprise Linux 6.5.
Cause EQL rmware reports discard_granularity as a non power of 2. Red Hat Enterprise Linux 6 blkdev_issue_discard
has never supported a non power of 2 discard_granularity. Therefore the le system creation hangs at the time of
installation.
NOTE: For more information, see the Kbase article 354883 at www.access.redhat.com.
Ethtool reports 10GbE port speed instead of 40GbE when
using Mellanox MLX4_EN driver
Description
On Dell PowerEdge servers installed with Red Hat Enterprise Linux 6.3/6.4, the Mellanox ConnectX-3 40GbE
ethernet adapter links at 40GbE when connecting two ports on the adapter consecutively, but the Ethtool reports
the link speed as 10GbE.
Workaround This issue is xed in Red Hat Enterprise Linux 6.5.
Cause The Ethtool utility tool reports the incorrect link speed.
Packet loss occurs when bonding device is congured in
balanced-alb mode
Description
In Red Hat Enterprise Linux 6.4, when bonding is congured in balance-alb mode, packet losses may occur when
you ping to one or multiple remote hosts.
Workaround This issue is xed in Red Hat Enterprise Linux 6.5
Cause The packet loss occurs due to the bonding device setup. The slave devices are enslaved before bond0 is brought
up. As a result, during setup, the bond_enslave function is called before the bond_open function. Hence, all slaves
do not have a unique MAC id as required by balance-alb mode. The MAC address is copied only to netdev and not
set on the hardware because the variable bond >alb_info.rlb_enabled is set only in bond_open. Any reply packet
having the MAC address, which does not match the bond0's MAC address is dropped. For example, slave device
2's MAC address, is dropped.
NOTE: For more information, see the Kbase article 390603 at www.access.redhat.com.
22 Installation instructions and important information