Dell EMC Unity: NAS Capabilities
Technical White Paper
Dell Unity: NAS Capabilities
Abstract
This white paper explains the NAS capabilities available on Dell Unity storage
systems. It provides a detailed review of the functionality, features, and protocols
supported, and enhancements enabled by the Dell Unity file system architecture.
April 2022
H15572
Revisions
Revisions
Date
Description
May 2016
Initial release ¨C Operating Environment version 4.0
December 2016
Updated for Operating Environment version 4.1
July 2017
Updated for Operating Environment version 4.2
March 2018
Updated for Operating Environment version 4.3
August 2018
Updated for Operating Environment version 4.4
January 2019
Updated for Operating Environment version 4.5
June 2019
Updated for Operating Environment version 5.0
October 2019
Template and format update
July 2020
Minor updates
January 2021
Minor updates
June 2021
Updated for Operating Environment version 5.1
April 2022
Updated for Operating Environment version 5.2 / Dell branding updates
Acknowledgments
Author: Ryan Poulin
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Copyright ? 2016 - 2022 Dell Inc. or its subsidiaries. All Rights Reserved. Dell Technologies, Dell, EMC, Dell EMC and other trademarks are trademarks
of Dell Inc. or its subsidiaries. Other trademarks may be trademarks of their respective owners. [4/22/2022] [Technical White Paper] [H15572.11]
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Dell Unity: NAS Capabilities | H15572
Table of contents
Table of contents
Revisions.............................................................................................................................................................................2
Acknowledgments ...............................................................................................................................................................2
Table of contents ................................................................................................................................................................3
Executive summary .............................................................................................................................................................6
Audience .............................................................................................................................................................................6
1
Introduction ...................................................................................................................................................................7
1.1
2
Terminology ........................................................................................................................................................7
NAS servers ...............................................................................................................................................................10
2.1
Interfaces ..........................................................................................................................................................10
2.2
High availability .................................................................................................................................................10
2.2.1 Link aggregation ...............................................................................................................................................10
2.2.2 Fail safe networking ..........................................................................................................................................11
3
4
5
3
2.3
Advanced static routing ....................................................................................................................................11
2.4
Packet reflect ....................................................................................................................................................13
2.5
IP multi-tenancy ................................................................................................................................................14
2.6
NAS server mobility ..........................................................................................................................................16
2.7
NAS parameters ...............................................................................................................................................17
Dell Unity file system ..................................................................................................................................................19
3.1
Scalability ..........................................................................................................................................................19
3.2
Storage efficiency .............................................................................................................................................20
3.3
Availability and recoverability ...........................................................................................................................20
3.4
Performance .....................................................................................................................................................20
3.5
Virtualization .....................................................................................................................................................20
3.6
File system attributes ........................................................................................................................................22
Shrink and extend ......................................................................................................................................................25
4.1
Manual extension..............................................................................................................................................25
4.2
Manual shrink ...................................................................................................................................................25
4.3
Automatic shrink ...............................................................................................................................................27
4.4
Automatic extension .........................................................................................................................................28
4.5
Minimum allocation size ...................................................................................................................................29
Quotas ........................................................................................................................................................................31
5.1
Quota types ......................................................................................................................................................31
5.2
Quota limits .......................................................................................................................................................32
5.3
Quota policy ......................................................................................................................................................35
Dell Unity: NAS Capabilities | H15572
Table of contents
6
Protocol options ..........................................................................................................................................................36
6.1
SMB ..................................................................................................................................................................36
6.1.1 Sync writes enabled .........................................................................................................................................37
6.1.2 Oplocks enabled ...............................................................................................................................................37
6.1.3 Notify on write/access enabled .........................................................................................................................38
6.1.4 Continuous availability ......................................................................................................................................38
6.1.5 Protocol encryption ...........................................................................................................................................39
6.1.6 Access-based enumeration ..............................................................................................................................39
6.1.7 BranchCache ....................................................................................................................................................39
6.1.8 Offline availability ..............................................................................................................................................40
6.2
NFS ...................................................................................................................................................................40
6.2.1 Parameters .......................................................................................................................................................42
6.2.2 NFSv4 ...............................................................................................................................................................44
6.2.3 Secure NFS ......................................................................................................................................................44
6.2.4 vVols .................................................................................................................................................................44
6.2.5 Host access ......................................................................................................................................................45
6.3
Multiprotocol .....................................................................................................................................................46
6.3.1 Directory services .............................................................................................................................................47
6.3.2 SMB ..................................................................................................................................................................47
6.3.3 NFS ...................................................................................................................................................................47
6.3.4 User mapping ...................................................................................................................................................51
6.3.5 Default accounts for unmapped users ..............................................................................................................52
6.3.6 Automatic mapping for unmapped Windows accounts ....................................................................................53
6.3.7 Mapping process ..............................................................................................................................................54
6.3.8 Mapping management and diagnostics ............................................................................................................56
6.3.9 Additional options .............................................................................................................................................57
6.3.10
Access policy .............................................................................................................................................57
6.3.11
UMASK.......................................................................................................................................................59
6.4
Locking and folder rename policy .....................................................................................................................61
6.4.1 Locking policy ...................................................................................................................................................61
6.4.2 Folder rename policy ........................................................................................................................................62
7
4
6.5
FTP and SFTP ..................................................................................................................................................63
6.6
Internationalization ...........................................................................................................................................64
Features .....................................................................................................................................................................66
7.1
Data reduction ..................................................................................................................................................66
7.2
Local protection ................................................................................................................................................66
Dell Unity: NAS Capabilities | H15572
Table of contents
7.2.1 Snapshots .........................................................................................................................................................66
7.2.2 NDMP ...............................................................................................................................................................68
7.3
Remote protection ............................................................................................................................................69
7.3.1 MetroSync .........................................................................................................................................................70
7.3.2 Asynchronous replication .................................................................................................................................72
7.3.3 RO proxy NAS servers .....................................................................................................................................76
7.3.4 RW SMB proxy shares .....................................................................................................................................77
7.3.5 Interfaces ..........................................................................................................................................................79
7.4
FAST technology ..............................................................................................................................................79
7.5
File Level Retention (FLR) ................................................................................................................................80
7.6
File top talkers ..................................................................................................................................................80
7.6.1 svc_topstats ......................................................................................................................................................80
7.6.2 Name resolution................................................................................................................................................83
7.6.3 File resolver cache............................................................................................................................................83
7.7
Custom file alert thresholds ..............................................................................................................................84
7.8
Common Event Enabler ...................................................................................................................................85
7.8.1 CAVA ................................................................................................................................................................85
7.8.2 CEPA ................................................................................................................................................................86
7.9
Cloud Tiering Appliance ...................................................................................................................................87
7.10 File import .........................................................................................................................................................89
8
Conclusion ..................................................................................................................................................................91
A
Technical support and resources ...............................................................................................................................92
A.1
5
Related resources.............................................................................................................................................92
Dell Unity: NAS Capabilities | H15572
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