Tape Lun Write Early And Read Ahead; Read Ahead - Brocade Communications Systems StoreFabric SN6500B User Manual

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Tape LUN write early and read ahead

8. In the Encryption Targets dialog box, select Target Port A, click LUNs, then click Add. Select the
9. In the Encryption Targets dialog box, select Target Port B, click LUNs, then click Add. Select the
10. Click Commit to make the LUN configuration changes effective in both paths simultaneously.
The Management application does not automatically commit LUN configuration changes. You must
manually commit any LUN configuration changes, even in non-multipath environments. Committing
LUN configuration changes manually allows the matching changes made in a multi-path
environment to be committed together, preventing cases where one path may be encrypting and
another path is not, thus causing corrupted data.
NOTE
There is a limit of 16 uncommitted tape LUN configuration changes. When adding more than eight
LUNs in a multi-path environment, repeat step 8 and step 9 above, adding only eight LUNs to each
target container at a time. Each commit operation will commit 16 LUNs, eight in each path.
Tape LUN write early and read ahead
The tape LUN write early and read ahead feature uses tape pipelining and prefetch to speed serial
access to tape storage. These features are particularly useful when performing backup and restore
operations, especially over long distances.
You can enable tape LUN write early and read ahead while adding the tape LUN for encryption, or
you can enable or disable these features after the tape LUN has been added for encryption.
Enabling and disabling tape LUN write early and read ahead
To enable or disable tape LUN write early and read ahead, follow these steps:
1. Select Configure > Encryption from the menu task bar to display the Encryption Center
2. Select a group, switch, or engine from the Encryption Center Devices table, then select
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LUNs to be encrypted and the encryption policies for the LUNs.
LUNs to be encrypted and the encryption policies for the LUNs, making sure that the
encryption policies match the policies specified in the other path.
dialog box (Refer to Figure 185
Group/Switch/Engine > Targets from the menu task bar.
NOTE
You can also select a group, switch, or engine from the Encryption Center Devices table, then
click the Targets icon.
The Encryption Targets dialog box displays
on page 526).
(Figure 304).
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