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Table 6.4 Summary of Backup Solution HOST Elephant Moose Cow Pig Ten 2GB clients AMOUNT OF DATA 300GB 100GB 60GB 60GB 20GB SENT TO WHICH HOST AND DRIVE 2 local DLT 7000s 1 local DLT 7000 3rd DLT 7000 on elephant DLT 7000 on moose DLT 7000s on elephant DURATION OF BACKUP 4 hr, 10 min 2 hr, 45 min 2 hr, 20 min 2 hr, 20 min 50 min

We were able to complete this design by using just four DLT 7000 drives, and we have capacity to spare. As we discussed, it could have been done with three DLT 7000s, but that would have left no room for growth and would have been an extremely tight fit. Since three drives would have a combined throughput of about 108MB/hour, all three drives would have to be operating for almost the entire backup window to complete the backups in the allotted time. Adding the fourth allows for additional growth and for tape changing, and makes it much easier to fit the backups in the window, especially if a tape drive failure or other problem interrupts the normal process.

R. Caulcutt and R. Boddy, Statistics for Analytical Chemists, Chapman and Hall, London, 1983. A. Fajgelj and A. Ambrus, Eds., Principles and Practices of Method Validation, The Royal Society of Chemistry, Cambridge, UK, 2000. M. L. Bishop, J. L. Duben-Engelkirk, and E. P. Fody, Clinical Chemistry, Lippincott Williams & Wilkins, Philadelphia, 2000. D. C. Harris, Quantitative Chemical Analysis, W. H. Freeman and Co., New York, 2002.

In this section, we look at a bunch of different ways to back up data beyond full backups, including differential and cumulative incrementals, hot backups, hierarchical storage management, archives, synthetic full backups, host-free backups, third-mirror breakoff, backups directly to disk, snapshots, multiplexed backups, and fast and flash backups.

6

1. V. P. Shah et al., Pharmaceut. Res. 17, 2000, 1551 1557. 2. W. Horwitz, Anal. Chem. 54, 1982, 67A 76A. 3. P. Willetts and R. Wood, in Principles and Practices of Method Validation, A. Fajgelj and A. Ambrus, Eds., Royal society of Chemistry, Cambridge, UK, 2000, pp. 271 288 4. B. Nix and D. Wild, in The Immunoassay Handbook, D. Wild, Ed., 2nd Ed., Nature Publishing Group, New York, 2001, pp. 198 210. 5. P. Ertl and S. R. Mikkelsen, U.S. Pat. 6,391,577 BI, granted May 21, 2002, and P. Ertl, E. Robello, F. Battaglini, and S. R. Mikkelsen, Anal. Chem. 72, 2000, 4957 4964. 6. M. T. Shipchandler and E. G. More, Clin. Chem. 41, 1995, 991 994. 7. A. J. Engelen and P. H. G. Randsdorp, J. AOAC Inter. 82, 1999, 112 118. 8. M. A. Huestis, J. M. Mitchell, and E. J. Cone, Clin. Chem. 40, 1994, 729 733.

When we discussed completing backups within a narrow time window, we did not discuss the use of incremental backups. A full backup, as discussed in the last section, is a backup where every bit of data on the disks is copied to tape. Though extremely reliable, full backups can be slow, since they back up all the data, regardless of whether it has changed since the last full backup. An incremental backup only copies the files or data that have changed since the last backup was taken. There are, in fact, two kinds of incremental backups. The first is a cumulative incremental, where all data that has changed since the last full backup is backed up. The other is a differential incremental, where all data that has changed since the last differential is backed up. Since differentials back up less data than cumulatives, they run faster. In Table 6.5, we compare three differing backup styles. For the purposes of our example, we made a few assumptions:

The total amount of data is 60GB. Of the 60GB, 5GB changes each day. Each day the amount of data to be backed up by the cumulative incremental grows by a smaller and smaller amount (for example, some of the same data that changed on Tuesday also changed on Wednesday). For simplicity s sake, we are not going to change the quantity of data being backed up. We can back up the data at 20GB an hour.