OpenVZ Forum


Home » Mailing lists » Users » A question about Node RAM
Re: A question about Node RAM [message #45173 is a reply to message #44835] Mon, 06 February 2012 15:43 Go to previous messageGo to previous message
Aleksandar Ivanisevic is currently offline  Aleksandar Ivanisevic
Messages: 34
Registered: April 2011
Member
Tim Small <tim@seoss.co.uk> writes:

> It also allows you to move nodes around easily and should allow you to
> carry out things like host node kernel updates without bringing down
> containers (using live migration to other HNs) - although we've not
> gotten around to testing this.

I've tested this and its terrible ;) Migration across two drbd volumes
syncing at the same time -- disaster in terms of latency and I/O
speed for the remaining node(s) in the cluster.

> Our machines are in pairs, but really it'd be better to have them in
> something like groups of four, so that when a HN fails, the remaining 3
> HNs each end up running a third of the evicted containers... This would
> require corosync instead of heartbeat of course (heartbeat supports 2
> nodes only).

Groups of four might work ok provided that the drbd devices are on
separate disks and you are careful always to migrate to an unrelated
machine that doesn't have the standby volume from the source.

Report message to a moderator

[Message index]
 
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Previous Topic: RHEL6 and stateful firewall inside container
Next Topic: Re: altlinux p6 template caches
Goto Forum:
  

[ Syndicate this forum (XML) ] [ RSS ] [ PDF ]

Current Time: Fri Apr 17 08:02:53 GMT 2026

Total time taken to generate the page: 0.37348 seconds
Powered by FUDforum Powered by Virtuozzo Containers