Whereas VxFlex OS always uses two copies of user data, invoking maintenance mode
introduces an additional copy that stores all writes created during maintenance to an
SDS or Fault Set (created during maintenance) in both a primary location and a new
location. This copy prevents data loss if a single failure occurs.
When the SDS or Fault Set is returned from maintenance mode, only the new writes
are required to be resynchronized, thus minimizing data transfer during and after the
update.
Instant maintenance mode does not interrupt application IOs; it can be run on any
amount of members of a Fault Set; and it can run in parallel on different Protection
Domains. While an SDS is in maintenance mode, most VxFlex OS operations (like
adding a volume) cannot be performed in the Fault Set, Protection Domain, or Storage
Pool in which the SDS and its devices reside.
To invoke maintenance mode, the following conditions are required:
l
Only one Fault Unit (or standalone SDS) can be in maintenance mode at any given
time.
l
No other SDSs can be in degraded or failed state (force override can be used).
l
There must be adequate space on other SDSs for the additional backup (force
override can be used).
Note:
Use of force override options when entering maintenance mode can lead
to data unavailability while maintenance mode is activated.
While an SDS is in maintenance mode, it can be shut down with no danger to data.
Adding or removing a server
When adding or removing servers, VxFlex OS redistributes the data accordingly and
seamlessly.
Maintaining the virtualization layer
The following operations may be performed on volumes that are exposed by the
VxFlex OS virtual SAN:
l
Add or remove a volume:
Create or delete a volume in the system.
l
Increase volume size:
Add capacity to a given volume, as needed. The change in volume size occurs
seamlessly without interrupting I/O.
l
Map and unmap volumes to an SDC:
This enables or disables access to a volume by an SDC, and thus by an application
residing on the same node.
Management tools
This section lists the available management clients that can be used with VxFlex OS.
Many of VxFlex OS actions can be performed using more than one tool.
You can provision, maintain, and monitor VxFlex OS using the following management
clients:
l
Command Line Interface (CLI)
The CLI enables you to perform the entire set of configure, maintain, and monitor
activities in VxFlex OS.
Architecture
74
Dell EMC VxFlex Ready Node AMS User Guide
Содержание EMC VxFlex Ready Node
Страница 1: ...Dell EMC VxFlex Ready Node Version 3 x AMS User Guide P N 302 005 733 REV 02 June 2019 ...
Страница 10: ...Contents 10 Dell EMC VxFlex Ready Node AMS User Guide ...
Страница 12: ...Figures 12 Dell EMC VxFlex Ready Node AMS User Guide ...
Страница 14: ...Tables 14 Dell EMC VxFlex Ready Node AMS User Guide ...
Страница 18: ...Introduction 18 Dell EMC VxFlex Ready Node AMS User Guide ...
Страница 24: ...Introduction to VxFlex Ready Node 24 Dell EMC VxFlex Ready Node AMS User Guide ...
Страница 80: ...Architecture 80 Dell EMC VxFlex Ready Node AMS User Guide ...
Страница 110: ...VxFlex OS Performance Fine Tuning 110 Dell EMC VxFlex Ready Node AMS User Guide ...
Страница 130: ...Managing and Monitoring 130 Dell EMC VxFlex Ready Node AMS User Guide ...
Страница 156: ...Managing System Objects 156 Dell EMC VxFlex Ready Node AMS User Guide ...
Страница 182: ...Security Management 182 Dell EMC VxFlex Ready Node AMS User Guide ...
Страница 188: ...Monitoring the System using the VxFlex OS GUI 188 Dell EMC VxFlex Ready Node AMS User Guide ...
Страница 252: ...Reference 252 Dell EMC VxFlex Ready Node AMS User Guide ...
Страница 274: ...Common Tasks 274 Dell EMC VxFlex Ready Node AMS User Guide ...
Страница 292: ...System events 292 Dell EMC VxFlex Ready Node AMS User Guide ...
Страница 324: ...SNMP Trap Support 324 Dell EMC VxFlex Ready Node AMS User Guide ...
Страница 348: ...DTK Hardware Update Bootable ISO 348 Dell EMC VxFlex Ready Node AMS User Guide ...
Страница 354: ...Glossary 354 Dell EMC VxFlex Ready Node AMS User Guide ...