Administrator Guide
Scenario System Status Data Integrity Comments
Simultaneous dual-NAS
controller failure in single NAS
appliance cluster
Unavailable Lose data in cache Data that has not been written to disk is lost
Sequential dual‑NAS controller
failure in multiple NAS
appliance cluster, same NAS
appliance
Unavailable Unaected Sequential failure assumes enough time is
available between NAS controller failures to
write all data from the cache to disk (Storage
Center or nonvolatile internal storage)
Simultaneous dual‑NAS
controller failure in multiple
NAS appliance cluster, same
NAS appliance
Unavailable Lose data in cache Data that has not been written to disk is lost
Dual‑NAS controller failure in
multiple NAS appliance cluster,
separate NAS appliances
Available, degraded Unaected
• Peer NAS controller enters journaling mode
• Failed NAS controller can be replaced while
keeping the le system online
Ports Used by the FluidFS Cluster
You might need to adjust your rewall settings to allow trac on the network ports used by the FluidFS cluster. For a list of ports
used by the FluidFS cluster, see the Dell Fluid File System Support Matrix.
How FS8x00 Scale-Out NAS Works
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