# High Availability

**URL:** <https://forums.suse.com/t/high-availability/32021>\
**Category:** SLES Configure-Administer\
**Created:** [February 14, 2018, 3:03pm UTC](https://forums.suse.com/t/high-availability/32021 "2018-02-14T15:03:31Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![niculelu](https://avatars.discourse-cdn.com/v4/letter/n/d26b3c/32.png) [@niculelu](https://forums.suse.com/u/niculelu)\
**Post date:** [February 14, 2018, 3:03pm UTC](https://forums.suse.com/t/high-availability/32021/1 "2018-02-14T15:03:31Z")

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hi,  
i wish to install and configure cluster on sles 12.  
in documentation [https://www.suse.com/documentation/sle-ha-12/install-quick/data/install-quick.html#sec\_ha\_inst\_quick\_installation](https://www.suse.com/documentation/sle-ha-12/install-quick/data/install-quick.html#sec_ha_inst_quick_installation)  
Click the Patterns tab and activate the High Availability pattern in the pattern list.

I click patterns and i do not see High Availability.

What should i perform in order to see it?

Or how can i install from command line?  
tnx

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**Author:** ![Eugen](https://avatars.discourse-cdn.com/v4/letter/e/ebca7d/32.png) [@Eugen](https://forums.suse.com/u/Eugen)\
**Post date:** [February 14, 2018, 4:05pm UTC](https://forums.suse.com/t/high-availability/32021/2 "2018-02-14T16:05:05Z")

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Hi,

> [@](#):
>
> Click the Patterns tab and activate the High Availability pattern in the pattern list.

prior to that instruction it says:

> [@](#):
>
> This pattern is only available after SUSE Linux Enterprise High Availability Extension has been installed as an extension to SUSE® Linux Enterprise Server.

Have you installed the extension on your server(s)? If not, this can be done via yast add-on.

Regards

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<div class="post-metadata">

**Author:** ![niculelu](https://avatars.discourse-cdn.com/v4/letter/n/d26b3c/32.png) [@niculelu](https://forums.suse.com/u/niculelu)\
**Post date:** [February 15, 2018, 9:40am UTC](https://forums.suse.com/t/high-availability/32021/3 "2018-02-15T09:40:57Z")

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hi,  
i installed after your answer.for corosync traffic,the 2 nics is better to be configured under bonding?tnx

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**Author:** ![Eugen](https://avatars.discourse-cdn.com/v4/letter/e/ebca7d/32.png) [@Eugen](https://forums.suse.com/u/Eugen)\
**Post date:** [February 15, 2018, 11:20am UTC](https://forums.suse.com/t/high-availability/32021/4 "2018-02-15T11:20:47Z")

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Hi,

in the link to the docs you mentioned, under the section “Communication Channels” it says:

[QUOTE]At least two TCP/IP communication media per cluster node. The network equipment must support the communication means you want to use for cluster communication: multicast or unicast. The communication media should support a data rate of 100 Mbit/s or higher. For a supported cluster setup two or more redundant communication paths are required. This can be done via:

- Network Device Bonding (to be preferred).
- A second communication channel in Corosync.[/QUOTE]

So I guess you’re not forced to, but it’s recommended to bond the interfaces.

Regards