XenServer 7 has launched!
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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.
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@scottalanmiller 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.
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?
Sigh - I installed new switches here in 2008 that were all 100 Mb - the price for 1 Gb switches was nearly double.
We are looking at replacing the switches, though like our old Wireless G system, they aren't failing, they are just on the slow side. And unlike the wireless - which is EOL, no support - the HP Switches have a lifetime guarantee.
So I find myself in the same quandry I asked about a year ago with my wireless - do I replace the switches just because they are old and slow, but not affecting production?
Sure in testing or me personally, I'm affected when I try to copy a large file to install Dragon Naturally Speaking, on the rare cases I need to do so, but is that enough to warrant switch replacement?
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@Dashrender said in XenServer 7 has launched!:
Sigh - I installed new switches here in 2008 that were all 100 Mb - the price for 1 Gb switches was nearly double.
That's half a decade after I replaced the switches at HOME with GigE!
You know you could have put in 100Mb/s Hubs for free that would have been "infinitely" cheaper than the 100Mb/s ones.
Price ratio isn't important, ROI is. -
@Dashrender said in XenServer 7 has launched!:
So I find myself in the same quandry I asked about a year ago with my wireless - do I replace the switches just because they are old and slow, but not affecting production?
Sure in testing or me personally, I'm affected when I try to copy a large file to install Dragon Naturally Speaking, on the rare cases I need to do so, but is that enough to warrant switch replacement?
Are they really not affecting production? That's surprising. For a lot of stuff I can see that they would not, but it sure seems like from time to time that people would be experiencing latency from that. I sure would at home.
