|
Feature |
NSI
Double-Take
VS
XOsoft WANsyncHA |
|
Ability to exclude
specific files/folders from replication
selection |
Yes |
Yes |
|
Continuous Data Replication |
Yes |
Yes |
|
Replication Granularity |
Byte-level |
Byte-level |
|
Open-file Replication |
Yes |
Yes |
|
Storage Hardware Independent |
Yes |
Yes |
|
Automatic Failover |
Yes |
Yes |
|
Automatic Failback |
Yes |
Yes |
|
Notification by e-mail, GUI,Event Log and SNMP |
Yes |
Yes |
|
Command Line support |
Yes |
Yes |
|
Data Compression |
Yes |
Yes |
|
Multiple levels of data compression |
Yes |
No –
either on or off |
|
ITComparison Team Comments |
Double Take provide better
flexibility when it come to compression levels. It offer multiple levels
of data compression, which give the chance for each organization to tune
the compression level to fit their specific need unlike XOsoft, which
offer only an On/Off switch to toggle compression On/Off. |
|
Scheduling per replication set |
Yes |
NO |
|
ITComparison Team Comments |
Double take has better
flexibility in allowing to have different scheduling per replication set,
oppose to having one scheduling per all sets. |
|
Application integration with “inband” Commands and Pre/Post Failover
Scripts |
Yes |
NO |
|
Snapshots Capability |
Yes |
Yes |
|
replicate NTFS encrypted files
(EFS) |
Yes |
NO |
|
ITComparison Team Comments |
Till today, XOsoft still does not support the replication of NTFS
encrypted files which is one of the widest used encryption method on
windows platform. Check
XOsoft does not support NTFS Encrypted
files replication
In
the other hand, Double Take provide full support for NTFS encrypted files
and provide a real solution for replicating encrypted files. XOsoft are
planning on supporting NTFS encrypted files replications in future
releases, but no specific date has been provided. |
|
Work on OS Layer |
Yes |
Yes |
|
Application Aware |
Yes |
Yes |
|
special rights required to replicate all data |
No |
Yes, Domain
Admin |
|
shares always in sync |
yes (once per
hour) |
No, Only
during initial
synchronisation |
|
ITComparison Team Comments |
Unlike Double Take, XOsoft
does not keeps shares in sync which can generate a great pain in keep up
with updating shares on the destination server specially when using XOsoft
to protect your file and print sharing servers. This factor can be a real
shy away factor from XOsoft when planning to protect file and print
sharing servers where shares changes often. Please check
http://www.xosoft.com/support/faq2/pub/show_subtopic.pl?sn=36
for more info on this XOsoft limitation.
Keep up with shares manually is not
required by Double Take as it keep it updated on hourly basis. If file &
print sharing is in your focus then Double Take got a great advantage
being able to keep up with your shares automatically. |
|
Microsoft Operations Manager support |
Yes |
False |
|
ITComparison Team Comments |
Double take offers a bit more
manageability and easy monitoring by allowing integration with Microsoft
MOM if desired. |
|
replication and synchronisation can run simultaneously |
Yes |
No, Full Sync has to be done before
Replication start. |
|
ITComparison Team Comments |
in XOSOFT (replication and
synchronisation) do not run together, this means that during re-sync there
is no replication and data is not protected till a full sync has been
established, on the other side Double take start both synchronisation and
replication when the connection is made, it means changes are sent
immediately and protection of data after connection establishment can be
reached faster. Double take approach lower the time data is unprotected
after connection establishment to minimum. |
|
replication volume-based |
No-it captures changes at the file
system level |
No-it captures changes at the file
system level |
|
Linux Support |
NO |
Yes, offer special products for
protecting Linux Data. |
|
replicates file permissions |
Yes, In real time |
Yes, but not in real time. |
|
Uses Memory Buffering to improve performance |
Yes |
No, Directly write to disk which slow performance. |
|
Support Level |
DIRECT 24/7 support from
the developer done by a team dedicated to Double-Take! |
24/7 support available, but the team
supporting the product is the CA team and is not only dedicated for XOsoft.
XOsoft support seems to be even worsen after they have been bought out by
CA, as they are not the butter and bread of CA. |
|
Investment Protection |
same single product for
File, SQL, Exchange, etc |
Separate Product for each application it
protect File, SQL, Exchange. |
|
ITComparison Team Comments |
Double Take uses a single
product which can protect Exchange, SQL, File, print server, etc with the
same license can be used to protect any one of them. This protect your
investment as you can move your license across the several servers you
want to protect freely as needed as licenses are not tied to the
application it protect. In the other hand, XOsoft has a different product
for each application it protect, which mean if you are buying license to
protect file & print server today then you got rid of your file & print
server and want license to protect your Exchange you would need to
purchase a new one, where in Double take you would move the license
across. |
|
The ability to manage replication
configurations from multiple client management stations simultaneously |
True |
False |
|
ITComparison Team Comments |
This ability of double can
lower the time necessary to make configuration changes to the replication
environment from multiple locations. Quite useful for large firms with
multiple sites. |
|
Full Server
Recovery ability. |
Yes, when adding Double-Take Server Recovery
Option (SRO) |
Nothing equivalent available yet |
|
ITComparison Team Comments |
Double-Take Server Recovery
Option (SRO) provides the ability to restore entire servers, including the
operating system (OS), applications and data – even to servers with
different hardware configurations. More it even allow the restoration of
the full server to many point of times. SRO is a unique feature of Double
take with no equivalent from any Disaster Recovery solution provider.
|
|
initial synchronization
Performance
Compression Disabled
Compression Enabled |
15%
faster
Twice as fast |
15%
longer
Twice as long |
|
resynchronization Performance
Compression Disabled
Compression Enabled |
5%
longer
30% faster |
5% faster
30% longer |
|
Failover Performance |
Double Take required almost 2/3 of the time
required by XOsoft to complete a failover. |
|
Exchange performance |
A bit faster than with XOsoft |
A bit slower than with Double Take. |
|
Replicate Registry changes |
Yes, but only with SRO Option |
Yes |
|
ITComparison Team Comments |
XOsoft replicate the Windows
registry to help their failover process, but it can increase the risk of
virus spreading to the disaster server as well. Double Take can offer
registry replication if you get the SRO option, but its not required. |