December 2021
Beginner
550 pages
20h 48m
English
Recovery is possible only if the company has access to reliable backups of its data and applications. Plans must include dealing with backup storage media, location, and access. Tape backup is the traditional choice for backups and still is in use today. However, restoration from tape is slow, and many systems have RTOs that are shorter than the tape-restore time. These kinds of sites often use disk-based solutions, such as a storage area network (SAN); network attached server (NAS); or even an offsite network-based storage, such as remote journaling. In remote journaling, the system writes a log of online transactions to an offsite location. The log then updates a copy of the database. Should the primary site ...