There is a problem in the latest upstream kernel with the device: $ grep -i lsi lspci 03:00.0 Serial Attached SCSI controller [0107]: LSI Logic / Symbios Logic SAS1068 PCI-X Fusion-MPT SAS [1000:0054] (rev 01) The device is simulated by the VMware ESXi 5.5 When hotplugging a new disk to the Guest Ubuntu OS, the latest kernel cannot automatically probe the disk. However, on the v3.19.0-80.88 kernel, the disk can be dynamically probed and show the following info message: mptsas: ioc0: attaching ssp device: fw_channel 0, fw_id 1, phy 1, sas_addr 0x5000c29a6bdae0f5 scsi 2:0:1:0: Direct-Access VMware Virtual disk 1.0 PQ: 0 ANSI: 2 sd 2:0:1:0: Attached scsi generic sg2 type 0 sd 2:0:1:0: [sdb] 2097152 512-byte logical blocks: (1.07 GB/1.00 GiB) sd 2:0:1:0: [sdb] Write Protect is off sd 2:0:1:0: [sdb] Mode Sense: 61 00 00 00 sd 2:0:1:0: [sdb] Cache data unavailable sd 2:0:1:0: [sdb] Assuming drive cache: write through sdb: unknown partition table sd 2:0:1:0: [sdb] Attached SCSI disk After looking up the message: mptsas: ioc0: attaching ssp device: fw_channel 0, fw_id 1, phy 1, sas_addr 0x5000c29a6bdae0f5 I found it comes from the path: mptsas_firmware_event_work -> mptsas_send_sas_event -> mptsas_hotplug_work -> mptsas_add_end_device I'll appreciate if anyone can give the idea: If it's possible that the irq from the simulated LSI SAS controller didn't come in to trigger the event? However, it can work on the v3.19 kernel so if there is any driver implementation issue in the latest kernel.
