The main difference between NAS and DAS and SAN is that NAS servers utilize file level transfers, while DAS and SAN solutions use block level transfers which are more efficient. NAS storage typically has a lower startup cost because the existing network can be used.
The key difference between DAS and NAS is that DAS storage does not incorporate any network hardware and related operating environment to provide a facility to share storage resources independently of the host so is only available via the host to which the DAS is attached.
RAID 1 - It follows the Mirroring mechanism, meaning data on the blocks are copied and replicated to multiple drives. It offers a great reading speed. However, writing the same data on different drives slows down the process. RAID 5 - It is based on the Parity mechanism and requires at least three disks.
The key difference between file access/NAS and block access/SAN is that in NAS, the file system resides on the array. SAN vs. NAS vs. DAS: Key differences and best use cases. By:
Surveillance drives are meant for recording video on 24/7 security systems. They typically use something called a network video recorder (NVR). Unlike a PC, these drives have to be writing data---specifically, video data---all the time. A Seagate representative told us writing accounts for about 90 percent of a surveillance drive's activity.
NFS file locking is mandatory or advisory, but SMB locking is mandatory. NFS has no fast file find; SMB has fast find. NFS no server and printer browsing, while SMB has server and printer browsing
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difference between nas and das
