Need to Improve Disk Utilization on XenServer 7.2
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KVM also fully supports MD RAID, as does Xen, but XenServer officially doesn't support software RAID at all, which is stupid and ridiculous. You can make it work just fine, but they try to make it hard.
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Fedora 26 makes a perfect platform for KVM. And Fedora 27 is releasing in just a couple of days.
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@scottalanmiller wow if Amazon is moving away that’s HUGE. What’s that going to do to XO?!?!
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@krisleslie said in Need to Improve Disk Utilization on XenServer 7.2:
@scottalanmiller wow if Amazon is moving away that’s HUGE. What’s that going to do to XO?!?!
XO was on here this week discussing that a lot. They are mostly still focused on XS, but definitely looking into how they can hook into KVM.
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@scottalanmiller
So it sounds like I would do an install of Fedora as a server not desktop, to strip away the GUI. Then install kvm? What about management tools? -
@krisleslie said in Need to Improve Disk Utilization on XenServer 7.2:
@scottalanmiller
So it sounds like I would do an install of Fedora as a server not desktop, to strip away the GUI. Then install kvm? What about management tools?You can also install the GUI on the server and have local management tools. Obviously managing purely remotely is better. But as this is a desktop anyway, local management tools are not out of the question and you can switch later once you are comfortable with it. There is no lock in to your GUI or tools choices like with Hyper-V.
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Check out this thread...
https://mangolassi.it/topic/14944/manage-kvm-through-cockpit/
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Just more reason I like open source I think I’m gonna switch to kvm at home
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@krisleslie said in Need to Improve Disk Utilization on XenServer 7.2:
Just more reason I like open source I think I’m gonna switch to kvm at home
I've been using KVM instead of Hyper-V or VirtualBox for desktop use for the last ~year and it is great. So much better.
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@scottalanmiller well like they say all good things come to an end
XSI like XO I hope he considers porting to KVM.
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A co-worker has the same laptop as I do, except the 15" version. Everything else is the exact same.
He's using EXT4 + LVM, and qcow2 for virtualdisks.
I'm using XFS + LVM, and RAW (.img) for virtual disks.
My Win10 VM gets twice the I/O as his. We both had nothing in the background running.
I know this doesn't help with Xen, but food for thought. (we're both using m.2 SSDs) Mine was over 2k MBps reads, his was 1k, mine was 400 MBps writes, his was 200
Edit: We're both running Fedora 26. At that time I was running Gnome and him Cinnamon.
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@tim_g what would be the comparison speed of a raid 10 off spinning rust to 1 ssd in iops?
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@krisleslie said in Need to Improve Disk Utilization on XenServer 7.2:
@scottalanmiller well like they say all good things come to an end
XSI like XO I hope he considers porting to KVM.
Oh he is considering it. Just don't know what he decided.
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@tim_g said in Need to Improve Disk Utilization on XenServer 7.2:
A co-worker has the same laptop as I do, except the 15" version. Everything else is the exact same.
He's using EXT4 + LVM, and qcow2 for virtualdisks.
I'm using XFS + LVM, and RAW (.img) for virtual disks.
My Win10 VM gets twice the I/O as his. We both had nothing in the background running.
I know this doesn't help with Xen, but food for thought. (we're both using m.2 SSDs) Mine was over 2k MBps reads, his was 1k, mine was 400 MBps writes, his was 200
Edit: We're both running Fedora 26. At that time I was running Gnome and him Cinnamon.
But both on KVM, right? No Xen involved?
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@krisleslie said in Need to Improve Disk Utilization on XenServer 7.2:
@tim_g what would be the comparison speed of a raid 10 off spinning rust to 1 ssd in iops?
A SATA 7200 RPM drive is ~100 IOPS. So four of them in RAID 10 is 400 Read IOPS.
A typical SATA SSD is 10K - 100K IOPS.
You would need hundreds of SATA drives in a massive RAID 10 with huge cache to come close to a single $100 SSD drive, let alone a nice M.2 drive.
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@scottalanmiller said in Need to Improve Disk Utilization on XenServer 7.2:
@tim_g said in Need to Improve Disk Utilization on XenServer 7.2:
A co-worker has the same laptop as I do, except the 15" version. Everything else is the exact same.
He's using EXT4 + LVM, and qcow2 for virtualdisks.
I'm using XFS + LVM, and RAW (.img) for virtual disks.
My Win10 VM gets twice the I/O as his. We both had nothing in the background running.
I know this doesn't help with Xen, but food for thought. (we're both using m.2 SSDs) Mine was over 2k MBps reads, his was 1k, mine was 400 MBps writes, his was 200
Edit: We're both running Fedora 26. At that time I was running Gnome and him Cinnamon.
But both on KVM, right? No Xen involved?
Correct.
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@tim_g said in Need to Improve Disk Utilization on XenServer 7.2:
A co-worker has the same laptop as I do, except the 15" version. Everything else is the exact same.
He's using EXT4 + LVM, and qcow2 for virtualdisks.
I'm using XFS + LVM, and RAW (.img) for virtual disks.
Why RAW (.img), I thought qcow2 is/was preferred?
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@fateknollogee said in Need to Improve Disk Utilization on XenServer 7.2:
@tim_g said in Need to Improve Disk Utilization on XenServer 7.2:
A co-worker has the same laptop as I do, except the 15" version. Everything else is the exact same.
He's using EXT4 + LVM, and qcow2 for virtualdisks.
I'm using XFS + LVM, and RAW (.img) for virtual disks.
Why RAW (.img), I thought qcow2 is/was preferred?
I don't need any special features like snapshotting or anything like that, only performance. RAW is presented as-is to the VM and gives the best IO performance.
I can always convert if need be, and there are other ways of snapshotting/checkpointing.
There are many other differences too, but it's better to google comparisons rather than me try to quickly explain it while preoccupied.
