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| Who | What | When |
|---|---|---|
| *** | up_the_irons has quit IRC (Ping timeout: 268 seconds) | [01:15] |
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| tmarble | I can't get into the portal... can anyone help? | [14:23] |
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ChanServ sets mode: +o up_the_irons | [14:59] |
| up_the_irons | wonder why I was booted... | [14:59] |
| tmarble | up_the_irons: can you help me get back into the portal? | [15:00] |
| up_the_irons | tmarble: just sent you a response to your ticket
tmarble: in fact, you should have a password reset email in your Inbox I generated one just now | [15:01] |
| tmarble | yep, trying it
yea, i'm in! | [15:02] |
| up_the_irons: thx! (wondering how you can do the live VM migrations??) | [15:11] | |
| mercutio | live migrations mean copying memory contents over network
so basically it just looks at the state of your vm, and recreates that on another host the storage itself can be accessed from multiple locations so doesn't need to be replicated | [15:19] |
| tmarble | that's crazy! is it with lxc, virtbox, xen or something else? | [15:20] |
| mercutio | kvm/qemu | [15:20] |
| tmarble | nice! | [15:20] |
| mercutio | backend is ceph | [15:21] |
| tmarble | i.e. you kind run "swap" to ceph and let it do the "network distribution" for you?
.. but page out everything | [15:21] |
| mercutio | ceph stores the whole block device
and distributes it across multiple servers | [15:21] |
| tmarble | oh.. the disk sure | [15:21] |
| mercutio | so you can lose one server and keep going etc | [15:21] |
| tmarble | how about memory? | [15:21] |
| mercutio | but it also means that you can join the network between two locations
and access the same storage from another location and storage can be moved from one location to another with no down time too memory it basically justs read in all of the memory and sends it to the other host | [15:22] |
| tmarble | so literally there's only a couple of seconds (to risk of transactions in flight) to pivot the "master"? | [15:23] |
| mercutio | that can take a few seconds, so after it's done that it copies any new changes | [15:23] |
| tmarble | is that something qemu supports out-of-the-box? | [15:24] |
| mercutio | well it's like swap, it'll trap all new memory accesses
so it knows to send them umm sort of it's out of the box.. but ceph, etc is reasonably complicated to setup | [15:24] |
| tmarble | understood | [15:25] |
| mercutio | you need at least 3 or 4 storage hosts to run ceph storage
but it scales out nicely | [15:25] |
| tmarble | it's the free/open source equiv of S3 :) | [15:26] |
| mercutio | but it means that very small setups aren't really used with it
ceph has a few things, an object store like s3 is one of them it also has rbd which we're using, and a file system rbd is basically optimised for block device storage and supports useful things that cater to that like resizing the block device | [15:26] |
| tmarble | cool! | [15:27] |
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| mnathani | Whats the network capacity / link between the 2 cages? And is it routed via the Meet Me Room, or direct cage to cage? | [17:18] |
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