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In the Navigation pane, click Manage Devices. |
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In the Drive Performance Options, configure the following settings. |
This option specifies the block size used for read and write operations. The default value is 64KiB. On Linux and UNIX systems, you can increase the media block size for optimum performance. | |||||||||||
On Windows, you might be required to change the registry setting MaximumSGList to use block sizes larger than 64KB. Before changing this setting, check that the SCSI bus is only used by the tape devices. If other devices also use the SCSI bus, this registry change might prevent them from working. If you want to apply these changes only to a specific channel on the HBA, consult the hardware vendor. To change the registry setting on Windows, follow these steps:
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The transfer buffer or the shared memory is allocated in blocks of 32KiB. The default value is 8193KiB.Changing the default Drive Transfer Buffer Size option. | |||||||||||
The total allowed shared memory is determined by the formula SHMMAX * SHMSEG. These values are often limited by the ulimit setting, and the command ulimit -a can be used to view these system settings. On Windows, you require at least 2GB RAM and large virtual memory. You might also have to change the MaximumSGlist setting on the SCSI card. |
Type or select the number of data blocks per compression unit. The default block size is 8KiB. |
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Click OK to save the settings and close the dialog box. |
The following table provides examples of the optimal values that can be used for some drive types.
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In the Navigation pane, click Manage Devices. |
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On the Tape Drive Management page, click Check, and then in the confirmation dialog box, click Check again. |
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In the Navigation pane, click Manage Devices. |
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If the device is offline, click Online to bring it back online. |
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If the device is online, click Offline to mark it offline. |
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