Adaptec 412R User Guide - Page 124
Lower performance than the active-active mode
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DuraStor 412R/6320SS/7320SS Installation and User's Guide Note: The controllers communicate with each other using SCSI initiator IDs 6 and 7 on each of the disk channels. You should not change these IDs. Advantages I Transparent fail-over and fail-back. I Single point of failure is the host system. (There are no single points of failure when dual host systems are configured with clustering software.) I Upstream fail-over. Disadvantages I Lower performance than the active-active mode. I Upstream fail-over requires third-party software. I Careful administration is necessary, since all the arrays are reported twice to the host operating system which must use third-party file share/file lock software to prevent data overwrites. A-22
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A-22
DuraStor 412R/6320SS/7320SS Installation and User’s Guide
Note:
The controllers communicate with each other using SCSI
initiator IDs 6 and 7 on each of the disk channels. You should
not change these IDs.
Advantages
■
Transparent fail-over and fail-back.
■
Single point of failure is the host system. (There are no single
points of failure when dual host systems are configured with
clustering software.)
■
Upstream fail-over.
Disadvantages
■
Lower performance than the active-active mode.
■
Upstream fail-over requires third-party software.
■
Careful administration is necessary, since all the arrays are
reported twice to the host operating system which must use
third-party file share/file lock software to prevent data
overwrites.