XenServer hyperconverged
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@olivier said in XenServer hyperconverged:
@fateknollogee If you are in replicated-2, you can add:
- 2 hosts to create a new extra RAID1 (bottom of a RAID0), creating a distributed-replicated (2x2)
- 1 host to go from replicated 2 replicated 3 (data is copied on three hosts, so it's a 1x3)
So you can scale in any fashion you want.
What are the benefits to scaling with 2 hosts at a time?
What are the benefits to scaling with only a single host at a time?
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@dustinb3403 Scaling at one host: going on "triplicate" (same data on each node, you have 1/3 of total disk capacity, but you can lose 2 hosts and still have data access).
Scaling by adding 2 hosts at the same time: it's adding a subvolume, so more space.
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Lets say I go from 6 hosts (like your pic above shows- Brown/Yellow/Pink) to 8 hosts...
Does the existing data get rebalanced/redistributed across all 8 hosts?
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@fateknollogee yes
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@olivier said in XenServer hyperconverged:
@fateknollogee yes
And how many copies of the data exist? I.E. how many nodes can be shut down before you loose access to data?
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@dashrender As far you don't lose a complete mirror (2 hosts on the same pair), no problem. So on 8 nodes, it means up to 4 hosts if there in one by mirror.
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@olivier So you only gain in capacity scaling in 2's? Again as I mentioned earlier I'm curious how the Write suspension functions during failure....
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@olivier said in XenServer hyperconverged:
@dashrender As far you don't lose a complete mirror (2 hosts on the same pair), no problem. So on 8 nodes, it means up to 4 hosts if there in one by mirror.
and what happens if you do loose an entire mirrored pair?
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Where will XOSAN exist in this pricing structure?
https://xen-orchestra.com/#!/pricing -
@olivier what happens if you add in a single host, and then later add another host so you have an even number.
Would you eventually get more storage?
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@dashrender The same thing as if you lost a mirrored pair with RAID1 or 10.
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@fateknollogee said in XenServer hyperconverged:
Where will XOSAN exist in this pricing structure?
https://xen-orchestra.com/#!/pricingI believe it was mentioned as being a separate price entirely. So you can get XOA with or without XOSAN.
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@r3dpand4 said in XenServer hyperconverged:
@olivier So you only gain in capacity scaling in 2's? Again as I mentioned earlier I'm curious how the Write suspension functions during failure....
Write are suspended few secs, works fine. Tested on Linux and Windows VMs.
@dashrender said in XenServer hyperconverged:
@olivier said in XenServer hyperconverged:
@dashrender As far you don't lose a complete mirror (2 hosts on the same pair), no problem. So on 8 nodes, it means up to 4 hosts if there in one by mirror.
and what happens if you do loose an entire mirrored pair?
If you lose an entire mirror pair, it's like in RAID10: you will lose data.
@fateknollogee said in XenServer hyperconverged:
Where will XOSAN exist in this pricing structure?
https://xen-orchestra.com/#!/pricingNope, it will be a dedicated pricing, per pool, without number of hosts or disk space limitations.
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@dustinb3403 said in XenServer hyperconverged:
@fateknollogee said in XenServer hyperconverged:
Where will XOSAN exist in this pricing structure?
https://xen-orchestra.com/#!/pricingI believe it was mentioned as being a separate price entirely. So you can get XOA with or without XOSAN.
XOA Free at least to get XOSAN (you need XOA to deploy and manage it).
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@olivier said in XenServer hyperconverged:
@dustinb3403 said in XenServer hyperconverged:
@fateknollogee said in XenServer hyperconverged:
Where will XOSAN exist in this pricing structure?
https://xen-orchestra.com/#!/pricingI believe it was mentioned as being a separate price entirely. So you can get XOA with or without XOSAN.
XOA Free at least to get XOSAN (you need XOA to deploy and manage it).
So with XOA Free you can get XOSAN?
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@olivier said in XenServer hyperconverged:
Nope, it will be a dedicated pricing, per pool, without number of hosts or disk space limitations.
When will pricing be available?
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@dustinb3403 said in XenServer hyperconverged:
So with XOA Free you can get XOSAN?
Yes, XOA Free + paid XOSAN will work.
@fateknollogee said in XenServer hyperconverged:
When will pricing be available?
It's a matter of weeks.
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@olivier said in XenServer hyperconverged:
@dustinb3403 said in XenServer hyperconverged:
So with XOA Free you can get XOSAN?
Yes, XOA Free + paid XOSAN will work.
@fateknollogee said in XenServer hyperconverged:
When will pricing be available?
It's a matter of weeks.
So then when will the community edition get XOSAN?
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@olivier We're talking about node failure where you're replacing hardware correct?
"On a 2 node setup, there is an arbiter VM that acts like the witness. If you lose the host with the 2x VMs (one arbiter and one "normal"), you'll go in read only."
So are Writes suspended until the 2nd node is brought back online and introduced to the XOSAN? Obviously that's going to be a lot longer than a few seconds even if you're talking about scaling outside of a 2 node cluster. Do you mean that Writes are suspended or cached in the event of a failure while Host is shutting down and then Writes resume as normal on the Active node? If this is the case when the new Host is introduced to the cluster the replication resumes, correct? -
@dustinb3403 said in XenServer hyperconverged:
@olivier said in XenServer hyperconverged:
@dustinb3403 said in XenServer hyperconverged:
So with XOA Free you can get XOSAN?
Yes.
@fateknollogee said in XenServer hyperconverged:
When will pricing be available?
It's a matter of weeks.
So then when will the community edition get XOSAN?
Not like this. We'll open source the gluster driver, to allow people to make their own solution (hyperconverged or not). But it won't be turnkey.
