HP Device Manager 4.6 - Deployment Guide

To calculate the time it will take:
4000 MB ÷ 3.5 MBps ÷ 60 sec per min ≈ 20 minutes to transfer the image file
The actual imaging task takes longer because there are extra steps before and after the file transfer. However, you can start
another batch without influencing the previous batch because the extra steps do not need much bandwidth. In this example,
the recommended value would be 30 units per batch and 30 minutes between batches, because HP recommends leaving a
buffer. The devices’ operating system makes no difference; only the image size makes a difference.
There are three kinds of tasks: PXE, FTP, and general. PXE tasks are PXE imaging tasks. FTP tasks are tasks that need file
transfer. (PXE tasks use file transmission.) All other tasks are general tasks. The PXE server and file repositories are
bottlenecks for simultaneous task executions.
Note
A payload task is differerent from general task that has a payload using file transmission, HPDM supports FTP, FTPS, SFTP,
and SMB protocols for transferring files. Compared to FTP, FTPS (FTP over SSL) is slower, and SFTP (SSH File Transfer
Protocol) is the slowest. If you use these protocols for repositories, set a larger amount on units per batch and a longer
interval between batches to make full use of your bandwidth.
Define default task batch parameters for different types of tasks in the Configuration Management dialog.
Figure 6. Setting default batch amount and interval values
There are two parameters for each type of task: Batch Amount and Batch Interval. The batch amount is how many devices
the server sends in a batch for one task. The interval is how long the server waits before sending the task to the next batch
of devices.
For example, the FTP batch amount is five devices and the interval is two minutes. When a payload task is sent to twelve
devices, the server sends the task to the first five devices. Two minutes later, the server sends the task to another five
devices, regardless of whether the first five devices are finished. Another two minutes later, the server sends the task to the
remaining two devices.
Adjust the default batch settings according to your environment. You might have to adjust the FTP server settings to get a
better performance on concurrent tasks.
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