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 Unaffected 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 Unaffected
● Peer NAS controller enters journaling mode
● Failed NAS controller can be replaced while
keeping the file system online
Ports Used by the FluidFS Cluster
You might need to adjust your firewall settings to allow traffic on the network ports used by the FluidFS cluster. For a list of
ports used by the FluidFS cluster, see the Dell EMC Fluid File System Support Matrix.
FluidFS System Management for FS Series Appliances
This section contains information about basic FluidFS cluster system management. These tasks are performed using the Storage
Manager Client.
NAS Access
FluidFS supports the Unicode /UTF-8 encoding, allowing concurrent access from any UTF-8 compatible client. All NAS
interfaces expect UTF-8 characters for file, folder/directory, share, and other names.
Consequently, all names are internally maintained and managed in UTF-8 format. While individual file and directory names are
each limited to 255 bytes, the number of characters might be further limited, due to the variable-width nature of the UTF-8
encoding.
Management Access
Management data items, such as volume names, share names, directory names, user names, description fields, and so on, are all
maintained in UTF-8 format.
For CLI access, UTF-8 terminal applications, such as XTERM, should be used. Terminal applications that do not support UTF-8
characters, such as KTERM, are not recommended.
Seamless Session Failover
Seamless session failover decreases the client connection timeout. With seamless session failover, you can easily move a
connection between cluster controllers. This feature sends a connection reset packet to the dropped client to immediately
terminate a session with a failed controller. The client will then reestablish the session with the new controller and the
connection will resume.
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FluidFS Administration