Managing the AMASS File System
•Read the drive manufacturers published data on your drive’s performance and block size
Some of these parameters are described below.
Correlate with File To improve performance on file systems with large files, it is
Sizegenerally better to have AMASS write to a tape with a large block size. On the other hand, on file systems with smaller files, it is generally better to have AMASS write to a tape with a smaller block size. This concept is illustrated below.
Tape Media
Writing large files to a tape with a large block size | Writing smaller files to a tape with a smaller block |
takes less time, thus improves performance. | size does not waste space on the tape. |
Correlate with | Calculating a block size for tape media must be correlated with |
MAXIOSZ | the MAXIOSZ parameter. The MAXIOSZ is defined when |
| installing AMASS and is the maximum size, in bytes, that |
| AMASS uses to transfer data to and from the cache. The |
| MAXIOSZ value varies depending on the operating system |
| AMASS is installed on. For more information on MAXIOSZ, |
| refer to “MAXIOSZ” in Installing AMASS. |
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| Caution |
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If you change the MAXIOSZ value after using AMASS, you may not be able to read or write to previous volumes that were formatted with the old MAXIOSZ parameter. At the very least, you will see a significant decrease in throughput.