Information about USB 3.0 SSD
Starting with Cisco IOS XE Fuji 16.9.1, support for USB 3.0 SSD is enabled on Cisco Catalyst 9300 Series Switches. USB 3.0 SSD provides extra 120GB storage for Application hosting. Applications can be hosted in KVM (Kernel Virtual Machines), LXC (Linux Containers), or Docker containers. The storage drive can also be used to save packet captures, trace logs generated by the operating system, Graceful Insertion and Removal (GIR) snapshots and third-party applications. USB3.0 SSD can be used simultaneously as a general-purpose storage device and as an app hosting device. You must use only Cisco USB drives; non-Cisco USB drives are not supported.
USB 3.0 SSD cannot be used to boot images, emergency install the images or upgrade the internal flash using SMU or install commands. Bootloader support for USB 3.0 SSD is not available.
USB 3.0 SSD is enabled with S.M.A.R.T (Self-Monitoring, Analysis and Reporting Technology) functionality for health monitoring of the drive. The purpose of S.M.A.R.T is to monitor the reliability of the drive and predict drive failures, and to carry out different types of drive self-tests. SMART Disk Monitoring Daemon (smartd) is enabled immediately after the insertion of a USB 3.0 SSD and starts logging warnings and errors in /crashinfo/tracelogs/smart_errors.log. These warning and errors are also displayed on the console. On removing the USB 3.0 SSD, smartd stops running.
USB 3.0 SSD comes as a field-replaceable unit (FRU) which offers flexible storage configurations. If SSD is used initially on a PC, the default partition on USB 3.0 SSD is created by the PC supporting all the file systems. If SSD is used initially on the switch, one partition of 120GB is created supporting EXT4 file system.