XenServer 7 has launched!
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@olivier said in XenServer 7 has launched!:
Using XO VM replication between 2 XS 7 hosts, initial copy of a 61GB VM in 8 minutes:
This is on a classic GB link.
Clearly, previous bottlenecks weren't in XO.
I have not seen anything like this on importing and exporting yet.
I am still getting super slow speeds.
Once I get all the VMs set up on the same machine, I will do some official testing.
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So you'll have to find the super slow bottleneck
My lab is pretty simple, if you need more info on how I achieved those speeds, tell me
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@olivier said
My lab is pretty simple, if you need more info on how I achieved those speeds, tell me
Well, in theory if I have two machines on a 1GB link, I should see speeds similar to yours, right?
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There is no magic: you need to have enough write speed on the target and read speed on the source.
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@olivier said
There is no magic: you need to have enough write speed on the target and read speed on the source.
Yeah, I'll set up some tests once I am done getting everything set back up.
Right now it's clipping along at 5MB/s so it's taking forever.....
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@olivier said in XenServer 7 has launched!:
There is no magic: you need to have enough write speed on the target and read speed on the source.
What is the sustained write speed on a SATA drive? I'm guessing it must be a lot lower than 120 MB/s??
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Depends of the drive, roughly between 40 and 60 MiB/s
edit: for a HDD
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@BRRABill said in XenServer 7 has launched!:
@olivier said
There is no magic: you need to have enough write speed on the target and read speed on the source.
Yeah, I'll set up some tests once I am done getting everything set back up.
Right now it's clipping along at 5MB/s so it's taking forever.....
Something is wrong with that picture. Even older SATA drives can hit 100MB/s. 100MB network connection could be topping out at that.
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For me, this is SSD going to SSD.
Granted, this current import is from my 100mbps desktop connection, but still, 40mbps is slow.
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I'm importing a 40GB VM, and it's already been almost 2 hours, which is about what 40GB takes to transfer at 5MB/s.
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@BRRABill said in XenServer 7 has launched!:
For me, this is SSD going to SSD.
Granted, this current import is from my 100mbps desktop connection, but still, 40mbps is slow.
That's within reason for a 100Mb network connection. The best I've seen out of a 100Mb network is 9MB/sec, that's on a network with zero other traffic.
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@BRRABill 1Gb networks are much nicer, and not any more expensive anymore. For future consideration.
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@travisdh1 said
That's within reason for a 100Mb network connection. The best I've seen out of a 100Mb network is 9MB/sec, that's on a network with zero other traffic.
Yeah, I am really just chatting at this point.
I'll set up two VMs on separate segments and test straight throughput and then the export/copy ... everything else.
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@travisdh1 said in XenServer 7 has launched!:
@BRRABill 1Gb networks are much nicer, and not any more expensive anymore. For future consideration.
Yeah, it's a long story.
The servers are all connected via 1GB, though.
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@BRRABill said in XenServer 7 has launched!:
@travisdh1 said in XenServer 7 has launched!:
@BRRABill 1Gb networks are much nicer, and not any more expensive anymore. For future consideration.
Yeah, it's a long story.
The servers are all connected via 1GB, though.
Assuming we both make it to Mangocon, maybe we can trade war stories
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@travisdh1 said
Assuming we both make it to Mangocon, maybe we can trade war stories
Sounds good!
I mean, 100Mbps is fine for 99% of what we do. It's just these VM transfers are a bear.
But, the new me with my fancy ML knowledge now just sets up a Linux instance and does the import/export on the 1GB segment. Viva la open source!
Of course THAT was also slow, which has me wondering... But as I said, nothing firm tested yet so we shall see.
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@Dashrender said in XenServer 7 has launched!:
@olivier said in XenServer 7 has launched!:
There is no magic: you need to have enough write speed on the target and read speed on the source.
What is the sustained write speed on a SATA drive? I'm guessing it must be a lot lower than 120 MB/s??
Way, way slower.
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@travisdh1 said in XenServer 7 has launched!:
@BRRABill said in XenServer 7 has launched!:
@olivier said
There is no magic: you need to have enough write speed on the target and read speed on the source.
Yeah, I'll set up some tests once I am done getting everything set back up.
Right now it's clipping along at 5MB/s so it's taking forever.....
Something is wrong with that picture. Even older SATA drives can hit 100MB/s. 100MB network connection could be topping out at that.
Can hit, but not sustain. Generally can't hit for very long at all.
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@BRRABill said in XenServer 7 has launched!:
For me, this is SSD going to SSD.
Granted, this current import is from my 100mbps desktop connection, but still, 40mbps is slow.
Don't mix speeds or write speed casually. Your desktop connection must be 100Mb/s (seriously, though, how did this happen, am I confused and this is still 2004?) and the drive speed is written in 40MB/s which is 320Mb/s. Right?
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@travisdh1 said in XenServer 7 has launched!:
@BRRABill said in XenServer 7 has launched!:
For me, this is SSD going to SSD.
Granted, this current import is from my 100mbps desktop connection, but still, 40mbps is slow.
That's within reason for a 100Mb network connection. The best I've seen out of a 100Mb network is 9MB/sec, that's on a network with zero other traffic.
Yeah, that even would be a rare speed. The rule of thumb is that on an empty connection you'd unlikely break 8MB/s.
