Traditional pools use dedicated spare space the dell

Traditional pools use dedicated spare space. The Dell EMC Unity Hybrid systems
reserve one spare drive per 31 drives. The system replaces a faulted drive in a
pool with a drive of the same type, and the same or greater size of the faulted disk.
HOMOGENEOUS POOL
HETEROGENEOUS POOL
Hard drives arranged in RAID Groups
Hot spares: Same type of
the faulted drive
Capacity>=capacity of the
faulted drive
Flash drives
RAID Group1[RG1]
RG
R
R
G
R
R
G
R
Flash drives
SAS drives
Hot spares

Page 23 © Copyright 2019 Dell Inc.
Error! No text of specified style in document.
Dell EMC Unity Concepts and Features -student guide
Dynamic Pools
The features and benefits of
dynamic pools are:
•
Supported on the Dell EMC
Unity physical hardware only
(XT models)
 All pools are built from
SAS-Flash drives only.
 All-Flash pools on the
supported storage systems
are dynamic pools by
default.
 It enables improved pool planning, provisioning, and delivering a better cost
per GB.
 The user must select the RAID type when creating a dynamic pool
•
Provisioned pools to a specific capacity
 The user can later expand the pool by a specific capacity, even if that means
adding only a single drive.
 It supports the mix of different Flash drive sizes.
•
Balanced workloads
 Pool moves data around when drives are added
 This automated process spread out the user data and workloads across
more drives, thus reducing the wear per drive within the pool
•
The major benefits of dynamic pools are the time it takes to rebuild a failed
drive. Dynamic pools do not require hot spares. Spare space is reserved within
the dynamic pool to rebuild a faulted drive.
DYNAMIC POOL
Spare space
Flash drives are added as needed

Page 24 © Copyright 2019 Dell Inc.
Error! No text of specified style in document.
Dell EMC Unity Concepts and Features -student guide
NAS Server
The Dell EMC Unity platform has a single-enclosure, two storage processor
architecture with no concept of designated hardware for the file services. File data
is served by using virtual file servers known as NAS Servers.
•
A NAS Server must
be created before
creating file systems.
•
NAS Servers are
used for NAS
protocols only. NAS
clients can connect to
file systems using
SMB, NFS, or both
simultaneously; iSCSI
block storage is
provided natively and
not through a NAS Server.
•
Each NAS Server is a separate file server. Users on one NAS Server cannot
access data on another NAS Server. Each NAS Server has a separate
configuration with independent network interfaces, sharing protocols, directory
services, NDMP backup, and security.
•
File systems are provisioned by selecting a storage pool and a previously
created NAS Server.
Client 1
Client 2
Client 3
Client 4

Page 25 © Copyright 2019 Dell Inc.
Error! No text of specified style in document.