裸金属服务器的快照功能必要性何在，又有哪些优势？

所谓快照，存储网络行业协会SNIA这样定义：关于指定数据集合的一个完全可用拷贝，该拷贝包括相应数据在某个时间点（拷贝开始的时间点）的映像。快照可以是其所表示的数据的一个副本，也可以是数据的一个复制品。

在裸金属服务器应用中，我们之所以要强调存储快照的重要性，主要还是取决于它对数据的保护功能，让用户能够进行在线数据备份与恢复。

我们时常说没有后悔药，但快照恰恰正是存储技术中的“后悔药”，通过快照功能，可以在存储设备发生应用故障或者文件损坏时进行快速的数据恢复。当然，快照不仅仅具备了“后悔药”的功能，还能给人不少小惊喜，比如为存储用户提供另外一个数据访问通道，当原数据进行在线应用处理时，用户可以访问快照数据，还可以利用快照进行测试等工作。

对于裸金属服务器而言，快照功能的必要性何在，又有哪些优势？

在主机参考裸金属服务器的官网上，他们对快照进行了详细的解释：用户可以通过管理控制台或者API接口创建超级云硬盘快照，保留某个时间点上的磁盘数据状态，用于数据备份或制作自定义镜像。用户还可以根据业务需求，创建自动或手动快照策略，定义磁盘自动创建快照的时间和保留时间，当数据丢失时，可通过快照将数据完整的恢复到快照时间点。

其核心优势在于：

1.增量快照：采用一个全量快照点搭配多个增量快照点的方式，省时省力。

2.回滚快照：支持秒级回滚快照，当超级云硬盘出现问题时，最大化降低故障恢复时间。

3.节省空间：以冗余方式存储；您也可以自定义删除快照释放空间。

4.降低成本：增量备份方式可缩短创建快照所需的时间，且可以节省存储成本。

5.创建新盘：支持基于快照创建新的超级云硬盘，新超级云硬盘是原始超级云硬盘的精确副本。

6.数据独立：通过对指定超级云硬盘进行完全可用的拷贝，使该备份独立于超级云硬盘的生命周期。

7.持久备份：支持用于保存业务数据的持久备份，可以保留业务数据的里程碑状态。

8.异地迁移：支持通过复制快照功能和跨地域复制，实现数据盘的异地迁移。

如果您有类似以下这三类需求，那么快照功能势必会让您的业务事半功倍：

数据日常备份

通过对超级云硬盘定期创建快照，实现对系统盘、数据盘的日常备份，您可以利用快照定期备份重要业务数据，以应对由于误操作、病毒以及黑客攻击等导致的数据丢失风险或数据不一致的情况。

数据快速恢复

更换操作系统、应用软件升级或业务数据迁移等重大操作前，您可以创建一份或多份快照，一旦升级或迁移过程中出现问题，可以通过快照及时将业务恢复到快照创建点的数据状态。

多业务快速部署

通过同一个快照可以快速创建出多个具有相同数据的超级云硬盘，从而可以同时为多种业务提供数据资源。 例如数据挖掘、报表查询和开发测试等业务。这种方式既保护了原始数据，又能通过快照创建的新超级云硬盘快速部署其他业务，满足企业对业务数据的多元化需求。

快照的重要性显然不言而喻，它在裸金属服务器管理，尤其是数据管理上是一个锦上添花的功能。对于一些对数据安全性要求高的业务场景，配备存储快照功能不但未雨绸缪，而且数据的安全性保障也大幅度提升。

主机参考最新推出了裸金属服务器租用产品，裸金属服务器是一种按需购买、按量付费的物理云服务器租用服务，可以提供云端专用的高性能、安全隔离的物理服务器集群。具体详询主机参考客服zhujicankao.com。

The so-called snapshot, storage network industry association SNIA defines a fully available copy of the specified data set, which includes the image of the corresponding data at a certain point in time (the point at which the copy starts). A snapshot can be a copy of the data it represents or a replica of the data.

In the application of bare metal server, the reason why we want to emphasize the importance of storage snapshot mainly depends on its data protection function, so that users can carry out online data backup and recovery.

We often say that there is no regret medicine, but snapshot is exactly the "regret medicine" in the storage technology. Through the snapshot function, you can quickly recover the data in case of application failure or file damage in the storage device. Of course, the snapshot not only has the function of "regret medicine", but also gives people many small surprises. For exle, it provides another data access channel for storage users. When the original data is used for online application processing, users can access the snapshot data, and can also use the snapshot for testing and other work.

For bare metal servers, what are the necessity and advantages of snapshot function?

On the official website of the host reference bare metal server, they explained the snapshot in detail: users can create a super cloud disk snapshot through the management console or API interface, keep the disk data status at a certain point in time, and use it for data backup or making customized images. Users can also create automatic or manual snapshot policies according to business requirements, and define the time and retention time for disks to automatically create snapshots. When data is lost, the data can be completely recovered to the snapshot point in time through snapshots.

Its core advantages are:

1. Incremental snapshot: use a full snapshot point with multiple incremental snapshot points to save time and effort.

2. Rollback snapshot: second level rollback snapshot is supported. When there is a problem with the super cloud disk, the recovery time is minimized.

3. Save space: store in a redundant way; you can also customize to delete the snapshot to free space.

4. Reduce cost: incremental backup can shorten the time required to create a snapshot and save storage costs.

5. Create a new disk: support the creation of a new super cloud disk based on the snapshot. The new super cloud disk is the exact copy of the original super cloud disk.

6. Data independence: make the backup independent of the life cycle of the super cloud disk by making a fully available copy of the designated super cloud disk.

7. Persistent backup: it supports persistent backup for saving business data, and can keep the milestone status of business data.

8. Offsite migration: it supports the offsite migration of data disks through the replication snapshot function and cross regional replication.

If you have the following three types of requirements, the snapshot function will make your business more efficient with less effort:

Daily data backup

By regularly creating a snapshot of the super cloud disk, daily backup of the system disk and data disk can be realized. You can use the snapshot to regularly back up important business data to deal with the risk of data loss or data inconsistency caused by misoperation, virus and hacker attack.

Fast data recovery

Before major operations such as operating system replacement, application software upgrade or business data migration, you can create one or more snapshots. Once there is a problem in the upgrade or migration process, you can restore the business to the data state of the snapshot creation point in time through the snapshot.

Multi service rapid deployment

Through the same snapshot, multiple super cloud disks with the same data can be created quickly, which can provide data resources for multiple businesses at the same time. For exle, data mining, report query and development test. This way can not only protect the original data, but also rapidly deploy other businesses through the new super cloud disk created by the snapshot, so as to meet the diversified needs of enterprises for business data.

The importance of snapshot is self-evident. It is an added function in bare metal server management, especially in data management. For some business scenarios with high requirements for data security, the storage snapshot function is not only a precaution, but also a significant improvement in data security.

The host reference newly launched the bare metal server rental product. The bare metal server is a physical cloud server rental service purchased on demand and paid by volume, which can provide a high-performance, secure and isolated physical server cluster dedicated to the cloud. For details, please refer to customer service zhujicankao.com.

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