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- In order for the data to be accessible to several cluster nodes, it is
placed on an external SAN or NAS storage device.
- The disks are normally managed using RAID 5 (using a parity disk), or
RAID 1 (mirroring).
- In this setup, a single disk failure will not cause the cluster to fail.
- The disks are stored in a RAID device, which allows replacing faulty disks
without powering down the other disks. This is called "hot-swap".
- On the other hand, since the storage device is connected via a network,
the server might lose access to it.
- To overcome this, more then one network path may be connected between
each cluster node and the storage device.