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Linux Administration: A Beginner s Guide
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If the amount of data that needs to be backed up is not too great or the data does not change once backed up (such as pictures, etc), this type of media works well The media lifetime varies by vendor For the purpose of backups, it is not unreasonable to expect a few years from optical media A combination between fixed and removable media is also increasing in popularity In combination solutions, regular backups are done to disk, with periodic backups moved from the backup disk to tape In all of the preceding backup options, plan for media failure That is, plan to move backed-up data to new media every few years This is necessary to ensure that you re not just using new media, but that the drive itself is still correctly calibrated and modern equipment can still read and write it In some cases, you may need to even consider the data format After all, data that can be read but not understood doesn t do anyone any good (Consider, for example, whether you could read a floppy disk given to you from your first computer today)
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When looking closely at tape-based backups, consider where the tape drive itself will be kept and what system it will be connected to Will the tape be on a busy server that already has a lot of active disks Will it be kept on a dedicated server with dedicated spooling disks Is there any contention on the bus used to transfer data to it (For example, if you re backing up to a SCSI tape drive, does that SCSI chain have other devices that are busy ) Finally, are you able to feed data to the tape drive fast enough so that it can stream If the tape drive cannot stream, it will stop writing until it gets more data This pause may be as long as several seconds on a slow mechanism, while the drive realigns itself with the tape and finds the next available position to write data Even if the pause is brief, when it occurs thousands of times during a single backup, it can increase your backup runtimes by many hours
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Unfortunately, network throughput is easily forgotten in the planning of backup operations But what good do you get from a really fast backup server and tape drive if you feed in the data through a thin straw Take the necessary time to understand your network infrastructure Look at where the data is coming from and where it s going Use Simple Network Management Protocol (SNMP) tools, such as MRTG (wwwmrtgorg), to collect statistics about your switches and routers If you need to back up machines that are connected via hubs, consider a backup sequence that won t back up two machines on the same collision domain at the same time Gathering all this information will help you estimate the bandwidth necessary to perform backups With your analysis done, you ll be able to figure out which upgrades will net you the best return for your money
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When requests to restore data from tape arrive, you re likely to be under the gun to get the data back to the user(s) as quickly as possible How long your users have to wait will depend on the tool used for backup This means you need to incorporate the cost of response time into your backup evaluation How much are you willing to spend to get the response time you need for a restore Disk-based restores are, of course, the fastest They also offer the possibility of online backups, where users can visit the backup server themselves and copy the file back Recordable CDs and DVDs are also quick, since the file can be quickly pulled from disc and given to the user as well Tape, by comparison, is much slower The specific file/data on the tape needs to be found, the archive read, and an individual file extracted Depending on the speed of the tape and the location of the file, this can take a little bit of time
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