My VE
- Thread starter Molch
- Start date
Hi,What do you think about the following Environment? Thanks!
there are some points where you can run in trouble:
1. only two nodes - if one node have an problem you loose the quorum and are not able to change something on the VM-config.
2. you "share" the local storage as nfs two both nodes?! - If one node fails, you loose all VMs from this node (and you are not able to start this Vm on the other node, because the VD-disks are lost (and point 1 also)).
3. USB-Disks as backup-disks produce often an high load during IO.
4. It's looks, that you simply use an single sata-disk as storage - without caching from a raid-controller and more disks you don't get an good IO-performance.
5. Backup and VMs are on the same disk? This produce also IO-problems.
To solve some problems, you can do following:
use tree nodes (there aren't an master/slave like in you diagram)
use drbd (one drbd-resource for each node) between you both "main"-nodes. So you get real shared storage, which also usable if one node is down!
Udo
Hi Molch
This are my suggestions (Supporting to the grandmaster udo):
1- If for you is possible have 2 Nodes for run VMs in HA with DRBD is a good idea, with these you will have the features of HA and live migration for your VMs enabled.
2- Don't forget that for obtain HA, fence configuration for the PVE Nodes is always required, otherwise "HA" will not work.
3- If you don't want add HA + live migration, then don't use DRBD
4- For last you must have a third PVE Node, this third node PVE don't use for run VMs, so this PC can be a old and simple PC that can run 64-bit operating systems, and this PVE Node will be used for the cluster quorum communication (quorum needs three PVE nodes as a minimum for get 2 votes if a node is crashed, otherwise you will have problems when some PVE Node crashed), also with lots capacity of hard disk for backups of VMs, in this case, the speed of the hard disks don't need to be fast, and NFS Server in this PVE Node will be your best option.
5- But if you will have three or more PVE Nodes for run VMs, and you think make backups on the night when the VMs have little movement, then make backups crossed between the PVE Nodes is good idea. Always you can add one extra hard disk into the PC and on each PVE Node for the backups, and always can be backups crossed between the PVE Nodes.
Best regards
Cesar
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