If the host HBA driver version is outdated, large I/Os may be split by the HBA, the default concurrency is insufficient, and the I/O latency increases, especially in low-load, full hit, and bandwidth-intensive scenarios.
Linux Hosts
Step 1 Run lsscsi to query the channel IDs corresponding to the HBA.
linux-ob3a:~ # lsscsi
[0:2:0:0] disk IBM ServeRAID M5015 2.12 /dev/sda
[1:0:0:0] cd/dvd TSSTcorp DVD-ROM TS-L333H ID03 /dev/sr0
[5:0:0:0] disk HUASY XXXXXX 2105 -
[5:0:0:1] disk HUASY XXXXXX 2105 -
[5:0:0:2] disk HUASY XXXXXX 2105 -
[5:0:0:3] disk HUASY XXXXXX 2105 -
[5:0:0:4] disk HUASY XXXXXX 2105 -
[5:0:0:5] disk HUASY XXXXXX 2105 -
[5:0:0:6] disk HUASY XXXXXX 2105 -
[5:0:0:7] disk HUASY XXXXXX 2105 -
[5:0:1:0] disk HUASY XXXXXX 2105 -
[5:0:1:1] disk HUASY XXXXXX 2105 -
[5:0:1:2] disk HUASY XXXXXX 2105 -
[5:0:1:3] disk HUASY XXXXXX 2105 -
[5:0:1:4] disk HUASY XXXXXX 2105 -
[5:0:1:5] disk HUASY XXXXXX 2105 -
[5:0:1:6] disk HUASY XXXXXX 2105 -
[5:0:1:7] disk HUASY XXXXXX 2105 -
[6:0:0:0] disk HUASY XXXXXX 2105 -
[6:0:0:1] disk HUASY XXXXXX 2105 -
[6:0:0:2] disk HUASY XXXXXX 2105 -
[6:0:0:3] disk HUASY XXXXXX 2105 -
[6:0:0:4] disk HUASY XXXXXX 2105 -
[6:0:0:5] disk HUASY XXXXXX 2105 -
[6:0:0:6] disk HUASY XXXXXX 2105 -
[6:0:0:7] disk HUASY XXXXXX 2105 -
[6:0:1:0] disk HUASY XXXXXX 2105 -
[6:0:1:1] disk HUASY XXXXXX 2105 -
[6:0:1:2] disk HUASY XXXXXX 2105 -
[6:0:1:3] disk HUASY XXXXXX 2105 -
[6:0:1:4] disk HUASY XXXXXX 2105 -
[6:0:1:5] disk HUASY XXXXXX 2105 -
[6:0:1:6] disk HUASY XXXXXX 2105 -
[6:0:1:7] disk HUASY XXXXXX 2105 -
In the preceding command output, the channel IDs corresponding to the HBA are 5 and 6.
Step 2 Run cd to go to the corresponding host directory.
linux-ob3a:~ # cd /sys/class/scsi_host/host5
linux-ob3a:/sys/class/scsi_host/host5 # ls
84xx_fw_version cmd_per_lun driver_version fw_state isp_id model_name optrom_fcode_version phy_version prot_guard_type sg_tablesize thermal_temp unique_id zio_timer
active_mode device fabric_param fw_version isp_name mpi_version optrom_fw_version power scan state total_isp_aborts vlan_id
beacon diag_megabytes flash_block_size host_busy link_state optrom_bios_version optrom_gold_fw_version proc_name serial_num subsystem uevent vn_port_mac_address
can_queue diag_requests fw_dump_size host_reset model_desc optrom_efi_version pci_info prot_capabilities sg_prot_tablesize supported_mode unchecked_isa_dma zio
Step 3 Run cat to query driver_version.
linux-ob3a:/sys/class/scsi_host/host5 # cat driver_version
8.04.00.13.11.3-k
