Displaying CPU histogram information
The CPU histogram provides information about task CPU usage. The CPU histogram is viewed in the
form of buckets (task usage is divided into different interval levels called
buckets
). For example, the
task run time is divided into buckets: bucket 1 (0-50 ms), bucket 2 (50-100 ms), bucket 3 (100-150
ms), and so on. The CPU histogram collects the task CPU usage in each bucket. This includes how
many times a task run time or hold time falls in each bucket, and the maximum run time and total run
time for each bucket. CPU histogram information is measured for the hold-time and wait-time of the
task.
• Hold time - The time that the task is holding the CPU without yield.
• Wait time - The time that the task is waiting for execution.
External USB Hotplug
External USB Hotplug support allows you to copy images, cores, logs, and configurations between the
external USB and the internal eUSB.
Brocade device images are stored in the raw partition. Cores, logs and configurations are stored in the
ext4 filesystem partition. The introduction of the External USB Hotplug gives you the option to easily
copy device images, cores, logs, and configurations between the external USB and the internal flash.
External USB Hotplug considerations
• Only USB drives of up to 128 GB of any vendor type are supported.
• USB 3.0 is not supported.
• You can copy files of less than 2 GB only.
• Make sure the external USB is formatted as a "FAT" filesystem before
attempting to use it. Formatting can be done on a PC or on the Brocade
device with the
format disk0
command.
• You should not insert a USB-based disk drive, nor should you insert a USB
hub to connect multiple USB disks.
• copy TFTP/SCP to disk0 and disk0 to TFTP/SCP commands are not
supported.
• Only an administrator can execute operations on an external USB, similar to
TFTP.
• You cannot access the active unit's local external USB from a member unit
and vice versa.
• Boot from an external USB is not supported.
• You must run the
unmount disk0
command before unplugging the external
USB. The external USB can be mounted using the
mount disk0
command.
• The USB drive is only functional on the active member in a stacked
environment.
Using External USB Hotplug
Plug in the External USB to begin using the External USB Hotplug commands. Use the
show files
disk0
command to check if the external USB is mounted and ready to use.
You can use the commands in the following table as part of the External USB Hotplug functionality.
Displaying CPU histogram information
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FastIron Ethernet Switch Administration Guide
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