2 RAID 1 or 1 RAID 10 for VM Server Host
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@black3dynamite said in 2 RAID 1 or 1 RAID 10 for VM Server Host:
@scottalanmiller said in 2 RAID 1 or 1 RAID 10 for VM Server Host:
@black3dynamite said in 2 RAID 1 or 1 RAID 10 for VM Server Host:
@tim_g said in 2 RAID 1 or 1 RAID 10 for VM Server Host:
@scottalanmiller said in 2 RAID 1 or 1 RAID 10 for VM Server Host:
@tim_g said in 2 RAID 1 or 1 RAID 10 for VM Server Host:
@scottalanmiller said in 2 RAID 1 or 1 RAID 10 for VM Server Host:
@kuyaz said in 2 RAID 1 or 1 RAID 10 for VM Server Host:
- What filesystem I should use on the host? ext4 or LVM? or other?
But you always want an LVM, and you never want EXT4.
When you install Fedora 26 for example, it will use EXT4 by default. So if you're not paying attention, you'll end up with that
Last I knew, that was only on workstations, where it doesn't matter so much. I'm using it on my laptop because... whatever.
It does it on Server too. I just installed F26 minimal a couple days ago... it's using EXT4. I'm redoing it now ^_^
/boot uses ext4
/ uses xfsNot on workstation installs. No XFS at all.
My response was toward the server install.
That's not what it does by default for me when using F26 Server Edition (from net install) and doing minimal or regular server installs.
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@tim_g said in 2 RAID 1 or 1 RAID 10 for VM Server Host:
@black3dynamite said in 2 RAID 1 or 1 RAID 10 for VM Server Host:
@scottalanmiller said in 2 RAID 1 or 1 RAID 10 for VM Server Host:
@black3dynamite said in 2 RAID 1 or 1 RAID 10 for VM Server Host:
@tim_g said in 2 RAID 1 or 1 RAID 10 for VM Server Host:
@scottalanmiller said in 2 RAID 1 or 1 RAID 10 for VM Server Host:
@tim_g said in 2 RAID 1 or 1 RAID 10 for VM Server Host:
@scottalanmiller said in 2 RAID 1 or 1 RAID 10 for VM Server Host:
@kuyaz said in 2 RAID 1 or 1 RAID 10 for VM Server Host:
- What filesystem I should use on the host? ext4 or LVM? or other?
But you always want an LVM, and you never want EXT4.
When you install Fedora 26 for example, it will use EXT4 by default. So if you're not paying attention, you'll end up with that
Last I knew, that was only on workstations, where it doesn't matter so much. I'm using it on my laptop because... whatever.
It does it on Server too. I just installed F26 minimal a couple days ago... it's using EXT4. I'm redoing it now ^_^
/boot uses ext4
/ uses xfsNot on workstation installs. No XFS at all.
My response was toward the server install.
That's not what it does by default for me when using F26 Server Edition (from net install) and doing minimal or regular server installs.
That's weird, I've tried multiple times and I still get same the setup.
/boot/efi = EFI System Partition
/boot = ext4
/ = xfs
swap -
@jaredbusch but isnt it risky when your old sata hdd fail? Wont it fail the whole system?
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@kuyaz said in 2 RAID 1 or 1 RAID 10 for VM Server Host:
@jaredbusch but isnt it risky when your old sata hdd fail? Wont it fail the whole system?
I did not mean a literal old drive. I meant any random 250 or 500 GB drive you have laying around and never really used. I have a collection of them taken from computers that shipped with SATA drives but I installed a 3rd party SSD instead.
But to answer the question, why would you not have the configuration all baked up? This is the same for ANY hypervisor. If the OS shits, whether due to physical drive failure or corrupted OS, you need to reinstall.
By not having the OS on the same array, reinstalling the OS does not affect your data.
Yes, you can get around that by only using a small partition on the array, but still. the headache is the same. So just put it on another disk.
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@jaredbusch ok noted with thanks. I got the idea now.
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@kuyaz said in 2 RAID 1 or 1 RAID 10 for VM Server Host:
@jaredbusch ok noted with thanks. I got the idea now.
I usually cut a small partition out of the big RAID10 (or in your case the RAID1). Like 50 GB for the hypervisor, and use the rest for DATA (virtual disks).
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@kuyaz said in 2 RAID 1 or 1 RAID 10 for VM Server Host:
@jaredbusch ok noted with thanks. I got the idea now.
This is a spot where Jared and I differ. He prefers an "old drive" for the Hypervisor. I generally prefer that it share space on the main array. But both approaches work. The one thing you never do is invest in a high performance array just for the hypervisor, it just doesn't matter. Also, Jared's approach really only makes sense if you have spare old drives. If you have nothing, it doesn't make much sense. Most people have old drives around, so it often can be done easily. But not always.
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@tim_g said in 2 RAID 1 or 1 RAID 10 for VM Server Host:
@kuyaz said in 2 RAID 1 or 1 RAID 10 for VM Server Host:
@jaredbusch ok noted with thanks. I got the idea now.
I usually cut a small partition out of the big RAID10 (or in your case the RAID1). Like 50 GB for the hypervisor, and use the rest for DATA (virtual disks).
This mirrors my approach.
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@scottalanmiller yup. In my case i have limited slot, so i guess i will put host and vm guest in my raid 1 sata hdd 2tb. Including the non critical vm there. And put the critical vm in raid 1 ssd.
Correct?
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@kuyaz said in 2 RAID 1 or 1 RAID 10 for VM Server Host:
@scottalanmiller yup. In my case i have limited slot, so i guess i will put host and vm guest in my raid 1 sata hdd 2tb. Including the non critical vm there. And put the critical vm in raid 1 ssd.
Correct?
This is correct.
Just make sure you only use a 20-50GB partition for the host.
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@jaredbusch cool. Will setup it tomorrow and get back to you guys when i hit a wall
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@kuyaz said in 2 RAID 1 or 1 RAID 10 for VM Server Host:
@scottalanmiller yup. In my case i have limited slot, so i guess i will put host and vm guest in my raid 1 sata hdd 2tb. Including the non critical vm there. And put the critical vm in raid 1 ssd.
Correct?
That makes the most sense, yes.
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@kuyaz said in 2 RAID 1 or 1 RAID 10 for VM Server Host:
@jaredbusch cool. Will setup it tomorrow and get back to you guys when i hit a wall
Good luck.
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@scottalanmiller said in 2 RAID 1 or 1 RAID 10 for VM Server Host:
@kuyaz said in 2 RAID 1 or 1 RAID 10 for VM Server Host:
@jaredbusch ok noted with thanks. I got the idea now.
This is a spot where Jared and I differ. He prefers an "old drive" for the Hypervisor. I generally prefer that it share space on the main array. But both approaches work. The one thing you never do is invest in a high performance array just for the hypervisor, it just doesn't matter. Also, Jared's approach really only makes sense if you have spare old drives. If you have nothing, it doesn't make much sense. Most people have old drives around, so it often can be done easily. But not always.
This also assumes you have a slot to put that extra drive into.
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@tim_g said in 2 RAID 1 or 1 RAID 10 for VM Server Host:
@kuyaz said in 2 RAID 1 or 1 RAID 10 for VM Server Host:
@jaredbusch ok noted with thanks. I got the idea now.
I usually cut a small partition out of the big RAID10 (or in your case the RAID1). Like 50 GB for the hypervisor, and use the rest for DATA (virtual disks).
Yup, I do the same. OS volume is around 50GB and the rest goes to something like /var/vms or the default /var/lib/libvirt/images.
Although I do put logs on their own volume.
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@scottalanmiller about this, so is it correct to say i should use lvm for all array and partition. And use xfs as file system? Avoid ext4 at all cost?
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@kuyaz said in 2 RAID 1 or 1 RAID 10 for VM Server Host:
@scottalanmiller about this, so is it correct to say i should use lvm for all array and partition. And use xfs as file system? Avoid ext4 at all cost?
Yes, that makes sense.
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since I use raid 1 for sata hdd. Can i upgrade to raid 10 in future without losing data? Assuming i use software raid MD.
After reading lots of online reference. It seems better to use IT mode to bypass dependency on spesific hardware raid requirement and better to go MD. So i have better compability to swap the hdd to another machine in case of machine failure. MD also use very minimum CPU & Memory and generally faster for ssd. Hardware raid will need truly the high end one with BBU else it is not recommended especially for ssd in case of power lost. Is it all true? CMIIW
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@kuyaz said in 2 RAID 1 or 1 RAID 10 for VM Server Host:
since I use raid 1 for sata hdd. Can i upgrade to raid 10 in future without losing data? Assuming i use software raid MD.
No, there is really no software or controller that will let you move from RAID 1 to RAID 10. You will need to delete and recreate to do that.
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@kuyaz said in 2 RAID 1 or 1 RAID 10 for VM Server Host:
After reading lots of online reference. It seems better to use IT mode to bypass dependency on spesific hardware raid requirement and better to go MD. So i have better compability to swap the hdd to another machine in case of machine failure. MD also use very minimum CPU & Memory and generally faster for ssd. Hardware raid will need truly the high end one with BBU else it is not recommended especially for ssd in case of power lost. Is it all true? CMIIW
That's correct, MD uses almost no resources and is faster than realistically any hardware RAID. Hardware RAID is not for speed, it is for features like blind swap, flash backing and making it easier for IT departments.
