What is block storage
Data is stored in fixed-size blocks. Only stores data in blocks themselves; the Address is a unique block identification information; for block storage, no metadata and application data when the local time, the performance would be better;. When the application data and geographically separated far , performance will be poor.
Applicable scene:
Suitable block storage for transactional database, may be used to store data in the most common business scenarios
What is object storage
I can understand that a massive storage space, the most suitable to produce on the internet store
Pictures, short videos, audio and other massive unstructured data, you can API at any time, anywhere access to objects stored in the data.
Each object consists of three parts:
- The data itself
- Customizable metadata, its type and the numbers are no restrictions, including the "What data is" context information, use, safety information, and so on.
- Globally Unique Identifier
Object Storage features:
1. Ease of expansion: all objects are the same level, there is no hierarchical relationship; number of objects is not limited
2. Easy sorting and searching: Because metadata tags, so the object is self-describing
Object Storage disadvantages:
Object storage is the ultimate consistency (block storage is strong consistency), therefore, the object store can not guarantee the return of a read request is the latest version of the data. (Note: Ceph seems to be strongly consistent, remains to be further studied here)
Application scenarios (MOS fir rock mass objects are stored in the following also widely Scenarios):
Standard Type: mobile applications | large sites | photo sharing | Hot Audio Video |
Low-frequency type of access: Mobile | applications and enterprise data backup | monitoring data | network application
Archive type: all kinds of long-term preservation of archival data | Medical Imaging | Footage
Difference block stored in the object storage
Further, Caozuoxitong blocks can be stored as a direct access mounted volume, and the object can not be stored in the case does not significantly reduce the performance of the access. Since memory blocks (e.g., remapping volume) storage management overhead is small, the storage management overhead and large object store.