1. Loaded router with latest PPC image for MX104
Hostname: mx104-r2011-re0 Model: mx104 mx104-r2011-re0> show version invoke-on all-routing-engines | match Junos: Junos: 21.2R3-S3.5 Junos: 21.2R3-S3.5 mx104-r2011-re0% ls /var/tmp/usb1 System Volume Information autorun.ico autorun.inf >>>>>>>mounted USB root@jtac-mx104-r2011-re0%
2. Removed USB and plugged again (without unmount procedure)
====== root@jtac-mx104-r2011-re0% ls /var/tmp/usb1 root@jtac-mx104-r2011-re0%
System going down IMMEDIATELY DDWaiting (max 60 seconds) for system process `vnlru_mem' to stop...done Waiting (max 60 seconds) for system process `vnlru' to stop...done Waiting (max 60 seconds) for system process `bufdaemon' to stop...done Waiting (max 60 seconds) for system process `syncer' to stop... Syncing disks, vnodes remaining...0 0 0 done syncing disks... All buffers synced. g_vfs_done():da1s1[READ(offset=574464, length=4096)]error = 6 >>>>>>>>>>>>FreeBSD same error seen (da1:dead_sim0:0:0:0): Synchronize cache failed, status == 0x8, scsi status == 0x0 (da1:dead_sim0:0:0:0): removing device entry fatal kernel trap: exception = 0x2 (data storage interrupt) virtual address = 0x0 srr0 = 0xa00c102c srr1 = 0x29000 curthread = 0xa7086540 pid = 1, comm = init panic: data storage interrupt trap Uptime: 16m36s Dumping 127 MB (248 chunks) chunk 0: 4202496 bytes ... ok chunk 1: 2138112 bytes ... ok chunk 2: 196608 bytes ... ok chunk 3: 78118912 bytes ... ok chunk 4: 24424448 bytes ... ok chunk 5: 475136 bytes ... ok chunk 6: 180224 bytes ... ok chunk 7: 663552 bytes ... ok
This behavior is expected on FreeBSD platforms.
Perform the below unmount procedure before removing USB from the device.
root@% umount /var/tmp/usb root@% umass1: at uhub0 port 1 (addr 3) disconnected (da1:umass-sim1:1:0:0): lost device (da1:umass-sim1:1:0:0): removing device entry umass1: detached
Refer to the following for more details:KB12880 - [Junos] How to mount a USB drive on EX/SRX/MX/QFX Series platforms to import/export files [juniper.net]