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.