Users Guide

Workaround If you do not want to upgrade to Red Hat Enterprise Linux 5 Update 6, use one of the following
workarounds:
• Disable Message Signalled Interrupts (MSI) in the native bnx2 driver (version 1.7.9-1)
and add options bnx2 disable_msi=1 to /etc/modprobe.conf.
• Use the bnx2 driver (version 1.8.7b or higher from the release version 14.1.0, A01)
available under Drivers and Downloads at dell.com/support.
Issues Fixed In Red Hat Enterprise Linux 5 Update 5
This section contains information about issues, resolutions, and their work around when using Red Hat Enterprise Linux
5 Update 5 on your Dell system.
Segmentation Fault With DHCPv6 Client
Description Restarting the DHCPv6 daemon causes it to segfault.
Workaround
1. Remove the files under /var/lib/dhcpv6/ and rerun the daemon.
2. Change the node.session.iscsi.FastAbort entry from the default value of Yes to No.
Cause This issue occurs due to a fault in the duplicate address detection logic.
Drop In Network File System (NFS) Read Performance
Description There may be a drop in the NFS read performance of large files on systems running Red Hat
Enterprise Linux 5. This issue occurs only when transferring files larger than the size of the
system memory.
Workaround Use one of the following methods:
• Reduce the slice idle time from 8 ms to a lower value, for example 1 ms.
To reduce the slice idle time, at the command prompt, type:
# echo 1>/sys/block/<device>/queue/iosched/slice_idle
.
• Change the I/O scheduler to a deadline scheduler, anticipatory scheduler, or noop
scheduler.
To change the I/O scheduler, at the command prompt, type:
# echo <scheduler_name>>/sys/block/sdX/queue/scheduler
.
Installing The Operating System On Drives Attached To SAS 5/iR Or SAS 6/iR Controllers
May Cause The System To Stop Responding On Boot
Description The operating system may not boot when Red Hat Enterprise Linux 5 Update 3 is installed on a
system that has a serial-attached SCSI (SAS) 5/iR or SAS 6/iR controller connected to more
than two hard drives.
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