DAS, NAS and SAN

DAS- physically connects to the server (depends on the server, the upgraded version of the local disk)

Advantages:

Easy to configure cheap solution

Disadvantages:

Isolated because disks are not flexible enough to be allocated by a single server

Storage where NAS- is attached to a dedicated storage device and accessed through a network share (file-level access to CIFS,NFS) data is transferred by hard disk-"memory -" CPU- memory-"network device, so data transfer is slow, but fragmented file transfer has advantages.

Advantages:

The price is relatively low, and NAS provides centralized storage at a reasonable price for easy configuration

Disadvantages:

Slow access time is not an enterprise solution

SAN- provides higher availability and maximum flexibility (SAN by using fibre Channel or ISCSI to read and write to disk)

Advantages:

The fastest access time is easy to scale a high level of redundancy in centralized storage

Disadvantages:

More expensive requires professional skills

Block level storage:

Outstanding performance is usually based on SAN. Providing LUN to the server is not the most cost-effective.

File-level storage:

With NAS, the storage server or file server provides the use of block-level storage at the back end of storage using CIFS/SMB (shared folder) or NFS (to-out)