Virtualization Redemption?
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@hubtechagain said:
using the hyper v replication, how do the VMs behave? they're offline, replicating, then boom, tree crashes through building and smokes our server rack. i just remote into the DR server and spin em up?
As I understand it, writes to one VM are also sent to the replica. The data sent happens at set intervals (e.g. 30s, 5min, and 15min). This creates redundant VMs on the two hosts with the replica slightly behind the source. When a tree crashes through the roof and craters one VM then the other simply keeps running (either it's the source and the target no longer receives updates, or it's the target and the host doesn't care).
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You say that you don't have enough storage to run both workloads on a single server... is your DR site going to have enough storage and RAM for that?
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@dafyre said:
You say that you don't have enough storage to run both workloads on a single server... is your DR site going to have enough storage and RAM for that?
Good point, we have to assume that both will failover at once, not just one at a time.
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yes, i said above i'm adding 2 600gb drives and switching from raid 10 to 6. it's a lot to read, but i respect that. each server has more than enough processing power to handle all jobs, just unnderbought storage.
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@hubtechagain Ooops on the underbuying storage, lol.
And yeah... Reading a lot of threads every day it hard to keep them straight, lol.
Out of curiosity... Why not switch local servers to RAID 6? ... aside from the headache of having to do it.
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@scottalanmiller
Thank you for mentioning StarWind here! I really appreciate it!@hubtechagain
So, just want to confirm that StarWind Virtual SAN can do the job here. I would recommend you to install on all the 3 nodes that you have and run the 3-way replication on the storage level. Thus there will be no need to have redundancy on the RAID level, so you can use RAID 0 and have good speed and more disk space, while StarWind will do the fault tolerance on the storage level.As about DR considerations, I would recommend to take a closer look at Veeam Backup and Replication solution - they look like a good fit here.
Maybe I could give more precise advices if we would jumped on the quick call. Email me please when you will be available ([email protected])
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@hubtechagain said:
yes, i said above i'm adding 2 600gb drives and switching from raid 10 to 6. it's a lot to read, but i respect that. each server has more than enough processing power to handle all jobs, just unnderbought storage.
I wouldn't say you under bought on storage. It's a DR situation. Assuming the business is OK with the performance at that level, I think this is perfectly acceptable.
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@Dashrender said:
@hubtechagain said:
yes, i said above i'm adding 2 600gb drives and switching from raid 10 to 6. it's a lot to read, but i respect that. each server has more than enough processing power to handle all jobs, just unnderbought storage.
I wouldn't say you under bought on storage. It's a DR situation. Assuming the business is OK with the performance at that level, I think this is perfectly acceptable.
Well, he apparently underbought by two drives. But not a big deal. Adding them now, problem solved. I would assume in a DR situation everything sharing an OBR6 pool is perfectly smart and reasonable.
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@hubtechagain said:
WTF is starwind?! ha
This is who we are
https://www.starwindsoftware.com/starwind-virtual-san-free
We give away free version to use on a bare metal servers (so you take a pair of them and turn into HA NFS or SMB3 NAS). This one has no restrictions at all (capacity is unlimited, production use is OK and you can be anybody to get it).
HA iSCSI and hyper converged versions are available to different set of people like MVPs, SpiceHeads, VCPs, some restricted ones to MCTs & bloggers. Technically we can bring same program to MangoLassi community as well. I just need some sort of a low watermark (points, rank or whatever) to make the program look a bit of private so my VP of Sales would not burn me with a blow torch
Cheers and let me know if you'd have any questions
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@hubtechagain said:
using the hyper v replication, how do the VMs behave? they're offline, replicating, then boom, tree crashes through building and smokes our server rack. i just remote into the DR server and spin em up?
Yup. You can even automate this process with PowerShell (not recommended as there's no protection against brain split) and use Azure orchestration site (this one is OK). See:
(Keith is a VERY smart and exceptionally pleasant guy BTW)
(Robert is MSFT serial Cluster MVP and I'm happy I know him in RL)
Good luck
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@KOOLER said:
@hubtechagain said:
WTF is starwind?! ha
This is who we are
https://www.starwindsoftware.com/starwind-virtual-san-free
We give away free version to use on a bare metal servers (so you take a pair of them and turn into HA NFS or SMB3 NAS). This one has no restrictions at all (capacity is unlimited, production use is OK and you can be anybody to get it).
HA iSCSI and hyper converged versions are available to different set of people like MVPs, SpiceHeads, VCPs, some restricted ones to MCTs & bloggers. Technically we can bring same program to MangoLassi community as well. I just need some sort of a low watermark (points, rank or whatever) to make the program look a bit of private so my VP of Sales would not burn me with a blow torch
Cheers and let me know if you'd have any questions
That is pretty cool. Most of us here are Spiceheads as well, so we're probably covered, though getting ML on the list would be awesome!!!
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So I want to backup a moment - @scottalanmiller
You think it would generally be more important to have two local servers with something like Starwind than having a replicated off site system? If you can only pick on or the other, which would you pick? -
@Dashrender said:
You think it would generally be more important to have two local servers with something like Starwind than having a replicated off site system? If you can only pick on or the other, which would you pick?
90% of the time I'd say two on site. But as Hub points out, the situations are not always uniform. His primary cause of failure is loss of site, not loss of server. A server dies, roughly, once every eight years (very rough.) His concern is loss of site every two to three years, I think. But that is very rare overall as a risk case.
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We have tornado risk here too, but I think his is a lot higher than mine.
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@Dashrender said:
We have tornado risk here too, but I think his is a lot higher than mine.
Everyone has tornado risk in the US. But even if you lose as site completely, let's say meteor strike, not everyone has a need for a DR site.
Example: you are a spa, you only have one physical site. Is a DR site for your computers valuable if the business itself cannot keep running? Probably not.
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I only underbought when trying to run all workloads on a single server. The role of the new DR server wasn't always DR. Our other servers are perfectly happy with extra space
Not going the starwind route, doesn't make sense for me as the DR site will in essence be providing me with the same (technically moreish) protection from failure. both site, and vm, or physical host failure on main site. if i wanted to buy 6 more drives, i could starwind it out and have uber ultra super safe mega secure situation.... just dont think they want to spend that right now. maybe a next year project expansion
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However, he'd still get the desired functionality out of his DR site if SERVER2 just dies / slings a rod / explodes or dies some othre violent death...
Spin up the replicated SERVER2 at the DR site and be happy.
If he were using StarWind, it could potentially be set up to automatically migrate to the DR site?
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@dafyre said:
If he were using StarWind, it could potentially be set up to automatically migrate to the DR site?
Not sure if SW would automate the DR site. It would automate the local failover for sure. Actually SW does nothing there, it just keeps the storage humming. HyperV HA is what handles the failover piece. StarWind just keeps the storage from having failed at all.
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Is not doing SW. Does not matter.
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@hubtechagain said:
Is not doing SW. Does not matter.
No longer needed, forum now has topic forking and the information that was requested was forked to a new topic. The above was in reference to posts that are no longer here.
