NAS Network Attached Storage server solutions
- Date: 2005-11-28
- Subject: NAS Network Attached Storage server solutions
- Duration: 41:06
- Format: MP3
- Size: 16,900 kb
- My Comments
- Standard PC solutions
- Define NAS: network attached storage
- Define SAN: storage area network
- Product Examples
~~ Standard PC solutions:
- Server storage (DFS, Samba)
- Shared folders
At first glance NAS and SAN might seem almost identical and in fact either will work in a situation. Basically both a NAS and SAN generally use RAID connected to a network. There are differences, though.
Define NAS: network attached storage
- Almost any machine that can connect to the LAN (or is interconnected to the LAN through a WAN) can use NFS, CIFS or HTTP protocol to connect to a NAS and share files.
- A NAS identifies data by file name and byte offsets, transfers file data or file meta-data (file owner, permissions, creation data, etc.), and handles security, user authentication, file locking.
- A NAS allows greater sharing of information especially between disparate operating systems such as Unix and NT.
- File System managed by NAS head unit.
- Backups and mirrors are done on files, not blocks, for a savings in bandwidth and time. A Snapshot can be tiny compared to its source volume.
Define SAN: storage area network
- Only server class devices with SCSI Fibre Channel can connect to the SAN.
- A SAN addresses data by disk block number and transfers raw disk blocks.
- File Sharing is operating system dependent.
- File System managed by servers.
- Backups and mirrors require a block by block copy, even if blocks are empty. A mirror machine must be equal to or greater in capacity compared to the source volume.
~~ Product Examples: