存储承诺服务：为什么我真的需要一个真正的目的？ [英] Storage Commitment Service: why I really need a what is the real purpose?

问题描述

我想知道为什么在 c-store 命令之后我真的需要承诺；

I'm wondering why I really need of commitment after a c-store command;

我可以理解该提交是对消息由存储实际负责并由存储负责的事实的保证，但是我想知道为什么依靠响应状态不够安全强>？

I can understand the commit is a sort of assurance about the fact the message was actually taken in charge by the storage and the storage takes the responsibility of it, but I wonder why is not safe enough to rely on the response status?

我读了一些解释，但是没有人说服我。据我了解，基本上可能是因为需要提交或最好提交，因为您不能完全信任要向其发送消息的系统。

I read some explanations about that but none convinced me all the way. As far as I understood a commit can be required or better desirable basically because you can not totally trust the system you are sending the message to.

听起来像：什么时候您在数据库表中插入记录，您需要验证记录是否确实已插入，因为您不信任数据库引擎...看起来有点奇怪吗？如果我不信任数据库引擎，我将用一个值得信任的数据库引擎替换它。

Well it sound like: when you insert a record in a database table you need to verify if the record has really been inserted as you can't trust the database engine... doesn't look like a little odd? if I can't trust the database engine I'm going to replace it with one trustable

任何人都可以对 Storage的真实含义进行更详尽的解释。承诺服务？

推荐答案

我将尝试使用我在职业生涯中一直在使用的2种系统的示例来回答您的问题。因此，这些不是伪造的示例，而是实际相关的案例。

I will try to answer your question with examples of 2 systems I have been working on in my professional life. So these are no dummy examples but practical relevant cases.

当此查看器接收到图像时，它们根本不会复制到磁盘。而是将它们保留在内存中并直接显示给用户。关闭查看器后，图像将从收到图像的系统中消失。

When this viewer receives images, they are not copied to disk at all. Instead, they are kept in memory and directly displayed to the user. When the viewer is closed, the images are gone from the system that has received them.

C商店成功表示：图片，而且我能够显示它们。

C-Store success means: I have received the images, and I am able to display them.

存储承诺不受此类系统的支持。

Storage commitment is not supported by such kind of a system.

该系统在站点上具有小型本地 PACS服务器，并具有少量磁盘容量。暂存缓冲区。本地 PACS服务器对图像进行加密，然后将其转发到异地存储中心，然后将其写入磁带。为了提供防弹数据安全性，对数据中心进行镜像（即复制到另一个位置的另一个存储中心，该位置也会将它们写入磁带）。
本地 PACS服务器是获取模式将其图像发送到该系统以进行存档的系统。

This system has a small local "PACS server" on site with a little disk capacity used as a scratch buffer. The local "PACS server" encrypts the images and forwards them to an off-site storage center where they are written to tape. For providing bullet proof data security, the data-center is mirrored (i.e. copied to another storage center in another location which also writes them to tape). The local "PACS server" is the system to which acquisition modalities are sending their images to for the purpose of archiving.

C商店成功表示：：我已经收到图像并将其插入到存储中心的队列中

C-Store success means: I have received the images and inserted them in a queue to the storage center

存储承诺成功表示：从两个存储中心收到确认，确认图像已保存在磁带上。从现在开始，我将负责保存图像-您可以删除本地副本。

Storage commitment success means: I have received confirmation from both storage centers that the images are saved on tape. From now on, I will be responsible for safekeeping the images - you are allowed to delete your local copies.

很明显，此过程需要数小时或数天的时间（大量数据时）迁移：甚至数个月）。因此，不适合通过C-Store成功来表示，因为在大多数情况下，映像（n-1）的C-Store成功触发了客户端端映像n的传输。

Obviously this procedure takes hours or days (when big amounts of data are migrated: even months). Thus it is not suitable to be expressed through C-Store success, for in most cases the C-Store success of image (n-1) triggers the transfer of image n on the client's end.

这就是为什么存储成功和存储承诺确认在您的图像在接收者端的安全程度方面有很大不同的原因。

This is why Storage success and Storage Commitment confirmation are quite different levels of "how safe your images are on the receiver's end".

当您与场外存档服务的供应商交谈时，他将声称：我们通过确认存储承诺来承担映像丢失的责任。作为本地PACS服务器在图像转移到存储中心之前可能已损坏，对于我们尚未确认妥善保存的图像，我们将不承担任何责任。换句话说：C-Store成功不允许您删除本地副本。

When you talk to the vendor of the off-site archiving service, he will claim: "We take responsibility for image loss by confirming storage commitment. As the local PACS server may be damaged before the images have been transferred to the storage center, we will not take responsibility for the loss of images for which we have not confirmed the safekeeping. In other words: C-Store success does not allow you to delete your local copies."

HTH

kritzel_sw

kritzel_sw

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