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This article mainly introduces the advantages and disadvantages of disk array and tape library backup in the server. What is introduced in this article is very detailed and has a certain reference value. Interested friends must read it!

Disk arrays have an overall throughput speed, which is often reflected in the performance index of "maximum continuous write disk" when backing up data. For example, SUN 6140 can achieve almost 800MB/s. This number must not be achieved with a single optical fiber.

The tape library also has Zu Ti throughput speed, which is reflected in the read and write speed of tape drives and the number of tape drives, such as SUN L1400, up to 20 tape drives. If LTO3 is used, the total speed can reach 1600MB/s. Similarly, this number must not be achieved with a single optical fiber.

So, whether you use a tape library or a disk array, there is the same problem for the host, bus speed, I big O interface speed, etc., regardless of it, we only compare the disk array and the tape library.

If the speed of the host side and connection side is fast enough, the bottleneck of backup speed lies in the backup device. The backup task can be processed in parallel with multiple data streams. For example, the Oracle database can open many Channel for parallel backup processing. At this time, the task can be assigned to different disk space and different tape drives, so in theory, it can reach the maximum speed of the backup device.

In this way, we can see that the overall throughput speed of the L1400M tape library with a full ratio of 6140 disk arrays is faster.

When considering the overall throughput speed, the tape loading and unloading operations and tape winding operations can usually be ignored. Because the impact of these things on processing speed is limited, unless you make a backup every 2 minutes, each backup is performed for 2 minutes. When we calculate such a large speed, we often consider the block-level backup of the database, with each database at least above 1TB.

Of course, some people will say that this belt library is expensive and the maintenance cost is not low. In fact, if the disk array needs this performance, it may need more advanced equipment, such as 6540, and its overall cost will not be very low. And don't forget that one feature of the tape library is that its performance has nothing to do with capacity. You can configure 20 tape drives and choose 700 slots. In fact, the price difference with 200 slots is very small. While the disk from a small capacity to a large capacity, the price difference is much worse.

When it comes to maintenance costs, it is even worse. 20 tape drives may consume less power than 20 disks, and tape drives are not 24-hour online devices, and with the same capacity, the number of disks may be 200. or even 1000? How much power will be consumed? So disk, virtual tape library is not used to replace tape library, it is just a supplement. But maybe one day the virtual tape library will really implement the disk Offline function, so the future of the tape library will be worrying.

These are all the contents of the article "what are the advantages and disadvantages of disk arrays and tape library backups in the server?" Thank you for reading! Hope to share the content to help you, more related knowledge, welcome to follow the industry information channel!

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