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.
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.
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?
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.
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.