[CentOS] KVM HA
lists at alteeve.ca
Wed Jun 22 18:42:29 UTC 2016
On 22/06/16 02:31 PM, John R Pierce wrote:
> On 6/22/2016 11:06 AM, Digimer wrote:
>> I know this goes against the
>> grain of sysadmins to yank power, but in an HA setup, nodes should be
>> disposable and replaceable. The nodes are not important, the hosted
>> services are.
> of course, the really tricky problem is implementing an ISCSI storage
> infrastructure thats fully redundant and has no single point of
> failure. this requires the redundant storage controllers to have
> shared write-back cache, fully redundant networking, etc. The
> fiberchannel SAN folks had all this down pat 20 years ago, but at an
> astronomical price point.
> The more complex this stuff gets, the more points of potential failure
> you introduce.
Or use DRBD. That's what we do for our shared storage backing our VMs
and shared FS. Works like a charm.
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