HGST Ultrastar Data102 User Manual page 218

User Guide
1. Connect the Ultrastar Data102 to a standard SAS HBA or a RAID SAS HBA hosted on the
Linux Server that presents the Enclosure Services Processor to the Linux operating system.
The Enclosure Services Processor in the Ultrastar Data102 will be referred to as an IOM.
Note: To perform an online firmware upgrade, the Ultrastar Data102 must be
configured with redundant data paths, meaning both IOMs must have a SAS
Port populated and connected to the host server.
SAS Configurations: The server host must be configured with multi-pathing
software that can handle the nature of the firmware upgrade. i.e. Once
firmware is downloaded to the IOMs, each IOM will reset and boot the new
code in a staggered fashion such that the host always has at least one path to
the drives to service I/O.
SATA Configurations: A SATA configuration should not be considered for an
online upgrade due to the single path nature of the topology.
Figure 195: Multipathing Configuration Minimum Requirement
2. Type the sg_scan -i command to verify that the enclosure has been found by the server.
# sg_scan -i | grep -i 4102 -B 1
/dev/sg2: scsi8 channel=0 id=50 lun=0
HGST
/dev/sg104: scsi8 channel=0 id=204 lun=0
HGST
Note: If the Ultrastar Data102 is connected to an HBA that does not present
the Enclosure Services Processor to the host for management purposes,
HGST recommends attaching the Ultrastar Data102 to a host that does
expose the Enclosure Services Processor so that the upgrade may be
performed.
H4102-J 2020 [rmb=0 cmdq=1 pqual=0 pdev=0xd]
H4102-J 2020 [rmb=0 cmdq=1 pqual=0 pdev=0xd]
208
5. System Management
5.1 Firmware Upgrade