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Media failures usually leave database systems unavailable for several hoursuntil recovery is complete, especially in applications with large devices andhigh transaction volume. Previous work introduced a technique calledsingle-pass restore, which increases restore bandwidth and thus substantiallydecreases time to repair. Instant restore goes further as it permits read/writeaccess to any data on a device undergoing restore--even data not yetrestored--by restoring individual data segments on demand. Thus, the restoreprocess is guided primarily by the needs of applications, and the observed meantime to repair is effectively reduced from several hours to a few seconds.  This paper presents an implementation and evaluation of instant restore. Thetechnique is incrementally implemented on a system starting with thetraditional ARIES design for logging and recovery. Experiments show that thetransaction latency perceived after a media failure can be cut down to lessthan a second and that the overhead imposed by the technique on normalprocessing is minimal. The net effect is that a few "nines" of availability areadded to the system using simple and low-overhead software techniques.

Instant restore after a media failure