HP StorageWorks Storage Mirroring for Linux User's Guide (T2558-96078, February 2008)

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Configuring queuing
There are five queuing parameters available for configuration.
1. Right-click a source machine and select Properties.
2. Select the Queue tab.
3. Specify the Folder which will store the queue. By default, this is /var/run/StorageWorks/StorageMirroring.
4. Specify the Maximum system memory for queue. This is the amount of system memory, in MB, that, when exceeded,
will trigger queuing to disk. This value is dependent on the amount of physical memory available but has a minimum of 32
MB. By default, 128 MB of memory will be used.
5. Specify the Maximum disk space for queue. This is the maximum amount of disk space, in MB, in the specified Folder
that can be used for Storage Mirroring queuing or you can select Unlimited which will allow the queue usage to
automatically expand whenever the available disk space expands. When the disk space limit is reached, Storage Mirroring
will automatically begin the auto-disconnect process. By default, Storage Mirroring will use the maximum amount of disk
space available. Setting this value to zero (
0) disables disk queuing.
6. Specify the Minimum Free Space. This is the minimum amount of disk space in the specified Folder that must be
available at all times. By default, 50 MB of disk space will always remain free. The
Minimum Free Space should be less
than the amount of physical disk space minus
Maximum disk space for queue.
7. Specify a percentage for Alert when queue usage reaches to identify the amount of the queue that must be in use to
trigger an alert message in the Linux system log. By default, the alert will be generated when the queue reaches 50%.
8. Click OK to save the settings.
NOTE: The Maximum disk space for queue and Minimum Free Space settings work in conjunction with each other.
For example, assume your queues are stored on a 10 GB disk with the
Maximum disk space for queue set to
10 GB and the
Minimum Free Space set to 500 MB. If another program uses 5 GB, Storage Mirroring will only
be able to use 4.5 GB so that 500 MB remains free.