VSANchat

Talking everything VMware VSAN
Join #VSANchat to discuss updates, questions and more around VMware Virtual SAN 6.1!
   6 years ago
#VSANchat#VSANchat - Talking VSAN 6.2! Join #VSANchat as we discuss Virtual SAN 6.2!
VMware vSAN
Thanks to everybody for joining #VSANchat today! If you have any questions around VSAN, please feel free to tweet to us @vmwarevsan! You can also check the Virtual Blocks blog for more information at blogs.vmware.com/vir...!
Victor Cenac
Best practices: Would a 5 node cluster benefit from a second VSAN nic? (separate VLAN)
Cormac Hogan
No guarantee of performance improvement, but great from an availability perspective (with a side effect of "possibly" improved network performance)
Aaron Kay
@CormacJHogan We are using two 10GB NICs per host in a single vSwitch in active passive. WOrks for us, but only provides fault tolerance. THere are VMware docs out there, but a simple, concise best practices doc would be great.
Cormac Hogan
@num1k got it - heard this before too.
Aaron Kay
@CormacJHogan Is dual NICs in active/passive config on a single vmk/vSwitch the best way to utilize 2 dedicated VSAN NICs/server? Can active/active provide the fault tolerance & improve total available throughput?
Victor Cenac
one doc mentioned VSAN networking has the same requirements as vMotion. We use 2 vnics per host for vMation. That;s not possible with VSAN. Failover is good, but does not require 2 VLANS.
Mike Ellis
On this note, is there a best practice for Network IO Control profiles for use with other shared NICs and traffic types?
Cormac Hogan
@num1k So there's no guarantee that any network configuration will improve performance. So really, there are a couple of different ways to configure VSAN networking
Cormac Hogan
@v2Mike Not really Mike. The only traffic that we recommend throttling with NIOC is vMotion which is notoriously greedy
Aaron Kay
@CormacJHogan We are finding individual spindle speeds are our performance limiter. But just turn up the stripe width, VM can push more IOPS. #itgoesto11
Cormac Hogan
@num1k During cache destaging? Or are you having read cache misses?
Matt Baltz
We have all flash disks currently setup in a hybrid configuration, whats the best way to migrate to all-flash mode?
Cormac Hogan
You can do it one disk group at a time. Evac disk group, remove it, create new AF disk group - rinse and repeat
Jase McCarty
how many hosts do you have?
Matt Baltz
@jasemccarty currently 4 we are looking to add a 5th
Matt Baltz
@CormacJHogan thanks I tried this in the HOL and figured it would be the easiest
Jase McCarty
@CormacJHogan I'd think that a new Cluster would have to be setup, as VSAN is either Hybrid or All-Flash (6.0) but cannot contain both configurations.
Jase McCarty
a couple hosts could be "brought out" and setup in a 2 node briefly, as you rolled through changing the config.
Cormac Hogan
@jasemccarty good point about support - I "think" it will be ok (done it myself) but best to be on the safe side
Jase McCarty
@CormacJHogan safe & supported are good.
Greg Peck
Deploying NSX manager in home VSAN..Space issues. I thought VSAN 6.1 used Thin Provisioning, but I seem to be running into trouble with that.
Jase McCarty
VSAN does use thin provisioning. A question I would ask, is what is your FTT setting?
Greg Peck
FTT is 1 (granted drives are 40GB on each node) with three nodes. NSX Manager is 60GB (but 3GB if thin).
Cormac Hogan
Those OVAs are probably already thick when they were created. I don't think we can do anything about that. They'll roll out thick IIRC
Jase McCarty
I think @CormacJHogan is correct there.
Victor Cenac
Upgrade Q: I upgraded the hosts to build 3029758. Do I need to upgrade the VC from 2776510 to take advantage of VSAN6.1 features?
Jase McCarty
to be able to use Stretched Clusters or ROBO, you would have to.
Victor Cenac
Well... I do get paid for these things... :)
Cormac Hogan
Also new health check features and in 6.0u1
Mike Ellis
#VSANchat Can you explain how SRM would work with VSAN Stretched Clusters? Is it even an issue?
Jase McCarty
SRM can be used to protect the Stretched Cluster to a 3rd sight, but not between the 2 sites. Add vSphere Replication from the Stretched Cluster to the 3rd site (with VSAN on the backend) and you can get a 5 min RPO.
Michael Haag
A blog by @DuncanYB was written on this recently of having Stretched Clusters and SRM: https://goo.gl/yn0ob...
VMware vSAN
Q3: We've heard the excitement around new VSAN features. Now, what is your favorite benefit that you've been seeing from VMware Virtual SAN?
brugh
seemless flash acceleration!
Steve Smith
low cost (next to NAS/SAN), speed, and storage profile flexibility
Aaron Kay
Health Check enhancements are nice to see. Not having to deploy advanced monitoring products right away speeds up deployment while still having insight into storage. The better overall performance is great too.
RyanGarvelink
@brugh What do you mean by this? The flash acceleration is seemless imo.
brugh
@RyanGarvelink exactly ;) that's my favorite benefit
Steve Smith
Has anyone looked at the HP Apollo 4200 as a storage-heavy VSAN node? Looks promising.
Steve Smith
I missed VMworld this year, but I gather that stretched clusters will be (or might now be) supported. True multi-site capabilities in VSAN would be fantastic.
Michael Haag
Stretched Cluster for VSAN is definitely here ... you can view some great info here http://vmw.re/1OcXIZ...
Pooja
yes it is! Check this out for details: http://www.vmware.co...
Jase McCarty
vSphere 6.0 Update 1 includes Virtual SAN 6.1. It was released on September 10th.
Steve Smith
Thanks much :)
Tim Davis
Will we ever be able to offload vSAN traffic to 10GigE interconnects, without a switch? I had this huge issue before when I was trying to do it, and found that it wasn't possible. We wanted it for our 1GigE robo sites.
Cormac Hogan
Not at present. There needs to be VSAN connectivity between three hosts (witness too), and you need a switch to do that. However, this isn't the first time we've heard this, especially for ROBO, so we're looking into ways to do it
Tim Davis
Great, thanks for the input. Makes sense.
VMware vSAN
Q2: Great to hear the excitement of VSAN 6.1 features. So, how do you leverage #VSAN for your business?
brugh
12000 user Lync platform
Tim Davis
ROBO sites where they have old physical servers ready to refresh. Rather than buy new SAN for ROBO, vSAN works perfectly.
Steve Smith
fairly pedestrian deployment, backing our new VDI environment. I assume this is one of the top use cases at this time.
Lieutenant VSAN
maybe a dedicated Oracle cluster so you don't have to worry about Oracle licensing...
Michael Haag
We've seen some great comments on #VSAN for ROBO and some VDI questions ... how else are people using #VSAN (or seeing it used)?
Thomas Findelkind
I hope a refresh for EVO RAIL with 2 node setup will follow
Michael Haag
@VmAlchemist VDI is definitely a popular use case - the cost, predictable scaling and performance make that a great fit ... are you deploying on all-flash or hybrid?
Rodrigo Gazzaneo
@MichaelJHaag curious about mission critical apps on #VSAN too
Lieutenant VSAN
@vGazza VSAN 6 is ready for mission critical apps!
Victor Cenac
replaceing 96 TB iSCSI SAN with 5 node VSAN
Rodrigo Gazzaneo
@LTVSAN no doubt about it. Curious about references.
Steve Smith
@MichaelJHaag We're deploying hybrid -- 2 disk groups per host --- 1.6TB SSD and 7x2TB SAS disks
brugh
@vicenac curious how you sized it; does it look anything like what http://virtualapplia... would advise?
Jase McCarty
We're seeing lots of adoption of Virtual SAN for VDI, which many customers see as Mission Critical.
Pooja
@vGazza Here is an example of T1 apps (Oracle, SQL server and a bunch of medical apps) on VSAN in healthcare: http://www.vmware.co...
Rodrigo Gazzaneo
@jasemccarty very true. Nothing more critical than end user computing platform.
Rodrigo Gazzaneo
@vmw_pooja thanks! Great use case!
Aaron Kay
Replaced aging iSCSI/FC SANs at multiple sites with VSAN clusters. Better performance, fault tolerance, cheaper, more flexible, more GB/dollar, easier to deal with.