I am the OP and I am using two RS3412xs in HA. The 1815 should handle 8-10 light VMs just fine... the Synology systems you will want to avoid when working with any appreciable IO would be the ones using Marvell or Freescale procs.jaknell1011 wrote:You all are mentioning 30 VMs and 8/10 VMs, I see that OP has a 3614. What model is everyone else using? I am trying to figure out if an 1815 can handle 8-10 lightly used Vm's.
Dont use SSDs for caching, its not really going to improve write performance much, and maybe a little read performance increase. Perhaps Synology (or the fastcache devs) will improve this but right now its not worth it. I would create another disk group w/ RAID 1 with those SSDs. If you have enough memory the Synology box will use that for caching / buffer, which works much better. BTW Synology states that the 3412xs's RAM is "Expandable, up to 6GB", I am at 8GB RAM.berntek wrote:quackhead, I work with the same setup as you exactly, and went through the same issues with IO. I eventually settled on NFS, but instead of HA, I have each Synology doing half the load with backups replicating to both as we run 25+ VMs with some high IO requirements. We currently run DSM 4.3 and I was wondering if you saw any issues with performance going to DSM 5.0/5.1? I am planning on adding memory during the upgrade, and also migrating the backups to a third unit. With the free'd up drive slots, I will be adding (2) 480GB SSDs for caching and I'm hoping that will make a big difference.
Are you only using 10GB for Synology HA, or is it for the ESX connections as well? How has the experience with HA been overall?
I am using 10GB NICs for NFS, SHA, and ESXi with failover to 1GB NICs. This switch: GS752TXS-100NAS. Flawless operation over the last 3 months. Performs like a dream still too... amazing systems when setup properly for NFS.
Learn from my two years experience of constantly tinkering with these Synology boxes. I finally have no need to babysit them anymore after moving from iSCSI to NFS for ESXi.