User guide

DataDirect Networks SFA™ OS 1.5.3.0 Release Notes Revision B | 13
• In an InfiniBand switch environment running RHEL 5.7, if a cable is pulled from
either an initiator or a target, a failover occurs as expected; however, once the
connection is reestablished, it does not fail back to the original controller.
o In order to resolve this issue, you must issue the command,
# udevtrigger.
o The Linux man pages state that the command will simply “request kernel
devices events for coldplug”. This will force udev to send a notification
for newly discovered path, which will allow the multipath daemon to
detect that the path has returned. After the multipath discovery takes
place, I/Os can be rebalanced back to allow the preferred paths to be
used.
• In an InfiniBand switch environment, an online upgrade causes an I/O error while
upgrading the second controller with SLES 10 SP4. In an FC environment, there
are no issues because the discovery rate is much quicker. The only option for SFA
upgrades with SLES 10 SP4 is to perform the upgrade offline.
To perform the upgrade offline,
1. Issue the CLI command set subsystem offline.
2. Perform the controller firmware upgrade on both controllers.
3. Issue the CLI command shutdown subsystem restart.
4. After both controllers come back online, issue the CLI command
application show discovered_initiator. This should report
“No discovered_initiators exist.” This will be the state until a read request
for information from those SCSI devices is issued. Once the devices are
accessed, there will be a small delay as they are rediscovered by the
system.
5.4 SFA10K and S2A6620
• On SS6000 enclosures the DISPLAY POWER_SUPPLY command may fail to display
the last three characters of the power supply serial number. This is only a display
issue, the command will complete successfully with no adverse effects other than
the truncated results.
• The SS6000 may encounter a problem where show enclosure commands will
return the following error message: “A command issued to an enclosure to get
attributes for the UI timed out.” This is an issue in the enclosure firmware v3.001
that is resolved by upgrading to enclosure firmware v3.010.
• Powering off drives is not supported with 6KSSI interposers in the SS6000
enclosure. If you issue the command, SET SLOT <encl-id slot-id> POWER OFF, the
system erroneously displays a success message. However, the drive power is not
affected by the command.
5.5 SFA10K
• The SS2460 does not support SLOT POWER OFF feature and so the SET SLOT
POWER command has no effect on drives in the SS2460.
• The Management Ethernet port (LAN4) may boot running at 10 Mb/sec half-
duplex, instead of 100 Mb/sec or 1000 Mb/sec full-duplex. Typically, full Ethernet
port speeds can be restored by unplugging and replugging the Ethernet cable to
the controller port experiencing the slow speed. If the issue persists, please
contact, [e-mail]
.
5.6 S2A6620
Power up the base enclosure first to ensure that full-drive rebuilds do not occur. Full
drive rebuilds may occur when the optional StorageScaler expansion chassis is
powered up before the main enclosure.