Small colo infrastructure for SaaS
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@pete-s said in Small colo infrastructure for SaaS:
@scottalanmiller said in Small colo infrastructure for SaaS:
In that case, why the live migration? Should not be needed at all, correct? If one node dies, the other just takes over?
Live migration for service, upgrades and such.
This would be in the case of performing host updates only. You're not gaining true HA at the application layer. If the guest takes a dive, you're still recovering from backup.
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@scottalanmiller said in Small colo infrastructure for SaaS:
@pete-s said in Small colo infrastructure for SaaS:
@scottalanmiller said in Small colo infrastructure for SaaS:
In that case, why the live migration? Should not be needed at all, correct? If one node dies, the other just takes over?
Live migration for service, upgrades and such.
When would that be needed? Maybe I'm picturing a very different setup....
Host updates that require a reboot. Few and far inbetween now-a-days.
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@dustinb3403 said in Small colo infrastructure for SaaS:
@scottalanmiller said in Small colo infrastructure for SaaS:
@pete-s said in Small colo infrastructure for SaaS:
@scottalanmiller said in Small colo infrastructure for SaaS:
In that case, why the live migration? Should not be needed at all, correct? If one node dies, the other just takes over?
Live migration for service, upgrades and such.
When would that be needed? Maybe I'm picturing a very different setup....
Host updates that require a reboot. Few and far inbetween now-a-days.
Even full reboot of the host is handled in my mental design.
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My biggest question is why split workloads, rather than just the two servers, one acting as the active host, the other acting as the backup host.
Remove the NL Storage server entirely.
Perform continuous replication from Host A to Host B, as well as backup offsite.
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@dustinb3403 said in Small colo infrastructure for SaaS:
My biggest question is why split workloads, rather than just the two servers, one acting as the active host, the other acting as the backup host.
Remove the NL Storage server entirely.
Perform continuous replication from Host A to Host B, as well as backup offsite.
Why even that much complexity? Only piece that needs replicated normally is the database.
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@scottalanmiller said in Small colo infrastructure for SaaS:
@dustinb3403 said in Small colo infrastructure for SaaS:
My biggest question is why split workloads, rather than just the two servers, one acting as the active host, the other acting as the backup host.
Remove the NL Storage server entirely.
Perform continuous replication from Host A to Host B, as well as backup offsite.
Why even that much complexity? Only piece that needs replicated normally is the database.
Because you'd need to have a readily available to use infrastructure somewhere that can host said database. Which might be beyond the technical expertise at the table to configure.
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@dustinb3403 said in Small colo infrastructure for SaaS:
@scottalanmiller said in Small colo infrastructure for SaaS:
@dustinb3403 said in Small colo infrastructure for SaaS:
My biggest question is why split workloads, rather than just the two servers, one acting as the active host, the other acting as the backup host.
Remove the NL Storage server entirely.
Perform continuous replication from Host A to Host B, as well as backup offsite.
Why even that much complexity? Only piece that needs replicated normally is the database.
Because you'd need to have a readily available to use infrastructure somewhere that can host said database. Which might be beyond the technical expertise at the table to configure.
I don't want to replicate the db to the cloud. I believe it will be too slow.
And I want to have the backup locally available so restores are fast - even if I will also backup to offsite at times.
Colo is 30 minute drive from our office.
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@scottalanmiller said in Small colo infrastructure for SaaS:
@dustinb3403 said in Small colo infrastructure for SaaS:
My biggest question is why split workloads, rather than just the two servers, one acting as the active host, the other acting as the backup host.
Remove the NL Storage server entirely.
Perform continuous replication from Host A to Host B, as well as backup offsite.
Why even that much complexity? Only piece that needs replicated normally is the database.
Because VM replication is not added complexity. it is easier, by far, than managing individual databases on every VM.
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@pete-s said in Small colo infrastructure for SaaS:
@dustinb3403 said in Small colo infrastructure for SaaS:
@scottalanmiller said in Small colo infrastructure for SaaS:
@dustinb3403 said in Small colo infrastructure for SaaS:
My biggest question is why split workloads, rather than just the two servers, one acting as the active host, the other acting as the backup host.
Remove the NL Storage server entirely.
Perform continuous replication from Host A to Host B, as well as backup offsite.
Why even that much complexity? Only piece that needs replicated normally is the database.
Because you'd need to have a readily available to use infrastructure somewhere that can host said database. Which might be beyond the technical expertise at the table to configure.
I don't want to replicate the db to the cloud. And I want to have the backup locally available - even if I will also backup to offsite at times.
Colo is 30 minute drive from our office.
Well, it will cost more upfront to do, but the solution is still sound. I would recommend an approach like Host A - Master, Host B slave - NLS backup target
Host A performs continuous replications to Host B, as well as Host A backs up to the NLS host on a different schedule.
Should Host A go down, everything is on Host B with a quick startup and you're off to the races.
You'd still have your separate backups to recover from should something even worse occur.
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@jaredbusch said in Small colo infrastructure for SaaS:
@scottalanmiller said in Small colo infrastructure for SaaS:
@dustinb3403 said in Small colo infrastructure for SaaS:
My biggest question is why split workloads, rather than just the two servers, one acting as the active host, the other acting as the backup host.
Remove the NL Storage server entirely.
Perform continuous replication from Host A to Host B, as well as backup offsite.
Why even that much complexity? Only piece that needs replicated normally is the database.
Because VM replication is not added complexity. it is easier, by far, than managing individual databases on every VM.
That's also a very good point.
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@jaredbusch said in Small colo infrastructure for SaaS:
@scottalanmiller said in Small colo infrastructure for SaaS:
@dustinb3403 said in Small colo infrastructure for SaaS:
My biggest question is why split workloads, rather than just the two servers, one acting as the active host, the other acting as the backup host.
Remove the NL Storage server entirely.
Perform continuous replication from Host A to Host B, as well as backup offsite.
Why even that much complexity? Only piece that needs replicated normally is the database.
Because VM replication is not added complexity. it is easier, by far, than managing individual databases on every VM.
It's more to fail than just having the workload on both all the time.
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@dustinb3403 said in Small colo infrastructure for SaaS:
@scottalanmiller said in Small colo infrastructure for SaaS:
@dustinb3403 said in Small colo infrastructure for SaaS:
My biggest question is why split workloads, rather than just the two servers, one acting as the active host, the other acting as the backup host.
Remove the NL Storage server entirely.
Perform continuous replication from Host A to Host B, as well as backup offsite.
Why even that much complexity? Only piece that needs replicated normally is the database.
Because you'd need to have a readily available to use infrastructure somewhere that can host said database. Which might be beyond the technical expertise at the table to configure.
It's pretty basic for any database today.
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@pete-s said in Small colo infrastructure for SaaS:
@dustinb3403 said in Small colo infrastructure for SaaS:
@scottalanmiller said in Small colo infrastructure for SaaS:
@dustinb3403 said in Small colo infrastructure for SaaS:
My biggest question is why split workloads, rather than just the two servers, one acting as the active host, the other acting as the backup host.
Remove the NL Storage server entirely.
Perform continuous replication from Host A to Host B, as well as backup offsite.
Why even that much complexity? Only piece that needs replicated normally is the database.
Because you'd need to have a readily available to use infrastructure somewhere that can host said database. Which might be beyond the technical expertise at the table to configure.
I don't want to replicate the db to the cloud. I believe it will be too slow.
Sure, but I don't think anyone is suggesting anything like that.
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@pete-s said in Small colo infrastructure for SaaS:
And I want to have the backup locally available so restores are fast - even if I will also backup to offsite at times.
Colo is 30 minute drive from our office.
Hence my design, failover is instantaneous and simple.
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@dustinb3403 said in Small colo infrastructure for SaaS:
@pete-s said in Small colo infrastructure for SaaS:
@dustinb3403 said in Small colo infrastructure for SaaS:
@scottalanmiller said in Small colo infrastructure for SaaS:
@dustinb3403 said in Small colo infrastructure for SaaS:
My biggest question is why split workloads, rather than just the two servers, one acting as the active host, the other acting as the backup host.
Remove the NL Storage server entirely.
Perform continuous replication from Host A to Host B, as well as backup offsite.
Why even that much complexity? Only piece that needs replicated normally is the database.
Because you'd need to have a readily available to use infrastructure somewhere that can host said database. Which might be beyond the technical expertise at the table to configure.
I don't want to replicate the db to the cloud. And I want to have the backup locally available - even if I will also backup to offsite at times.
Colo is 30 minute drive from our office.
Well, it will cost more upfront to do, but the solution is still sound. I would recommend an approach like Host A - Master, Host B slave - NLS backup target
His picture states shared nothing migration. I would argue, like you, that it should be live VM replication.
And the storage is only for backups as he already stated.
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@scottalanmiller said in Small colo infrastructure for SaaS:
@dustinb3403 said in Small colo infrastructure for SaaS:
@scottalanmiller said in Small colo infrastructure for SaaS:
@dustinb3403 said in Small colo infrastructure for SaaS:
My biggest question is why split workloads, rather than just the two servers, one acting as the active host, the other acting as the backup host.
Remove the NL Storage server entirely.
Perform continuous replication from Host A to Host B, as well as backup offsite.
Why even that much complexity? Only piece that needs replicated normally is the database.
Because you'd need to have a readily available to use infrastructure somewhere that can host said database. Which might be beyond the technical expertise at the table to configure.
It's pretty basic for any database today.
Sure, its easy enough to move a database in a planned move, during a disaster you have to pay the host, setup the DNS records, move the data, let all of the changes sync.
VM replication is extremely straightforward. On XenServer with XO it creates a full initially and then only performs the delta's afterwards.
The data is on both locations, always.
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@dustinb3403 said in Small colo infrastructure for SaaS:
Should Host A go down, everything is on Host B with a quick startup and you're off to the races.
Why quick startup, rather than both running in parallel? There is no licensing cost to running both, there is no obvious benefit unless the only goal is to avoid a load balancer.
What am I missing?
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@scottalanmiller said in Small colo infrastructure for SaaS:
@pete-s said in Small colo infrastructure for SaaS:
And I want to have the backup locally available so restores are fast - even if I will also backup to offsite at times.
Colo is 30 minute drive from our office.
Hence my design, failover is instantaneous and simple.
It is most certainly is not. It is definitely more complex.
He has hypervisor A with 20 web apps running everything.
Hypervisor A shits.
Now, every single one of those 20 VM's on hypervisor 2 must be logged into and the IP addresses updated, or the router must be logged into and all the inbound traffic must be rerouted. or the added complexity of some kind of magic pool of proxy servers must be previously setup.
Either way, once hypervisor a comes back online, you have to spend more time and effort figuring out how to reverse the replication process.
On the other hand, you setup hypervisor replication from host to host and something to heartbeat it to turn on the VM's on the second host on a failure.
Then when host A comes back, you simply reverse the replication and host 2 goes back to being standby.
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@dustinb3403 said in Small colo infrastructure for SaaS:
Sure, its easy enough to move a database in a planned move, during a disaster you have to pay the host, setup the DNS records, move the data, let all of the changes sync.
Still not following. Since this would be planned, even in the event of a disaster, it's still free and easy. What am I missing? there is no DNS, no data to move, no syncing... nothing.
Both nodes have the DB all of the time. None of your concerns would exist until yet another layer of disaster were to strike. At which point, you'd be recovering from backup rather than load balancing to the other node.
