User manual

LaCie 12big Rack Serial Troubleshooting & Problem Solving
User Manual page 38
4.4. Dealing with Hardware Faults
Ensure that you have obtained a replacement module of the same
type before removing any faulty module.
CAUTION: If your LaCie 12big Rack Serial is powered up and you
remove any module, replace it immediately. If the enclosure is used
with plug-in modules, Dummy Carriers or Blank modules missing
for more than a few minutes, the Enclosure can overheat, causing
power failure and data loss. Such use will invalidate the warranty.
✦ Replace a faulty drive with a drive of the same type and equal
or greater capacity.
✦ All drive bays must be fitted with a SAS/SATA Drive Carrier
or Dummy Carrier module in order to maintain a balanced
air flow.
✦ All of the supplied plug-in power supply units, electronics
modules, dummy carriers and blank modules must be in place
for the air to flow correctly around the cabinet.
Please refer to 5. Module Removal & Replacement for details of
module removal/replacement procedures.
4.5. Continuous Operation During
Replacement
Depending on how the LaCie 12big Rack Serial is configured, if a
disk unit fails, it can normally be replaced without interrupting the
use of the system.
In addition, each enclosure contains two PSUs, either of which can
maintain power and cooling to the subsystem while the other is re-
placed.
NOTE: The PSU replacement time must be as short as possible
(<30 minutes) as the enclosure is designed to operate with two PSUs
installed.
IMPORTANT INFO: in the event of a cooling fan failure the com-
plete Dual Fan Cooling Module must be replaced within <10 sec-
onds.
4.6. I/O Module Firmware Upgrade
LaCie periodically issues updates to the Storage Enclosure Processor
(SEP) firmware as part of a scheduled release package, this code
needs to be loaded onto each I/O in the enclosure.
There are two ways to perform this upgrade, one uses the diagnostic
serial port on the LaCie 12big Rack Serial (Out of Band) and the
other uses SCSI commands over the SAS topology (In Band)
4.6.1. I/O Module Firmware Upgrade Out
of Band
This method uses a Host PC running a ‘terminal’ application to
download the firmware using an RS232 serial cable to connect to
the I/O module to be upgraded.
Instructions for this method are supplied with the upgrade package
in the LaCie 12big Rack Serial Upgrade Procedure document.
4.6.2. I/O Module Firmware Upgrade In
Band
This method uses the data path to transfer the firmware update to
the LaCie 12big Rack Serial, hence no extra cables should be re-
quired. SCSI commands are issued to transfer the data blocks. There
are two methodologies, the preferred method uses SES page 0x0E
download but a Write Buffer method is also available.
4.7. Drive Firmware Upgrade
CAUTION: Upgrading firmware in SAS and SATA drives should
only be performed by the most experienced users. If firmware is in-
correctly upgraded it could result in a drive becoming non-func-
tional.