Specifications

4–42 Planning Storagesets
Transportable devices have these characteristics:
❏ Can be interchanged with any SCSI interface that does not use the device
metadata, for example, a PC.
❏ Cannot have write-back caching enabled.
❏ Cannot be members of a shadowset, storageset, or spareset.
❏ Do not support forced errors.
Consider these points when using the TRANSPORTABLE switch:
❏ Before you move devices from the subsystem to a foreign subsystem, delete
the units and storagesets associated with the device and set the device as trans-
portable. Initialize the device to remove any metadata.
❏ When you bring foreign devices into the subsystem with customer data fol-
low this procedure:
a.Add the disk as a transportable device. Do not initialize it.
b.Copy the data the device contains to another nontransportable unit.
c.Initialize the device again after resetting it as nontransportable. Initializing
it now places metadata on the device.
❏ Storagesets cannot be made transportable. Specify NOTRANSPORTABLE
for all disks used in RAIDsets, stripesets, and mirrorsets.
❏ Do not keep a device set as transportable on a subsystem. The unit attached
to the device loses forced error support which is mandatory for data integrity on
the entire array.
Device Transfer Rate
Specify a transfer rate that the controller uses to communicate with the device. Use
one of these switches to limit the transfer rate to accommodate long cables between
the controller and a device, such as a tape library. Use one of the following values:
■ TRANSFER_RATE_REQUESTED=20MHZ (default)
■ TRANSFER_RATE_REQUESTED=10MHZ
■ TRANSFER_RATE_REQUESTED=5MHZ
■ TRANSFER_RATE_REQUESTED=ASYNCHRONOUS