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My question is really short. Sometimes we have to separate i/o from a machine for example case of remote file system ? Why we do that ?

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    What, are you talking about.
    – Zoredache
    Jul 3, 2014 at 23:23
  • Separating input output operations from local machines. For example the use of nfs as backend of too web servers.
    – Ali Mezgani
    Jul 3, 2014 at 23:25
  • Why do you thing the use of NFS for web servers is to separate I/O?
    – Zoredache
    Jul 3, 2014 at 23:29
  • First reason we shared filesystem. But we isolate io too ?
    – Ali Mezgani
    Jul 3, 2014 at 23:30

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Sometimes we have to separate i/o from a machine for example case of remote file system ? Why we do that ?

There are a gazillion reasons for this, but those reasons can usually be classified into the following categories:

  • increased performance
  • increased reliability
  • increased availability
  • shared filesystems
  • physical limitations (e.g not enough space/power/etc. in this server rack for a 64-bay drive enclosure)
  • administrative separation (server group has one section of the datacenter, storage group has another section)
  • advanced storage functions (things a SAN would provide like snapshotting, replication, etc.)
  • etc.
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