Posts made by kuyaz

I install server edition. it is for homelab to test kvm.
but when i run virt-manager it show error the display is not set.

tried this but fail : https://serverfault.com/questions/531269/linux-drivers-for-dell-poweredge-server

it seems dell is not really friendly to fedora

@scottalanmiller help

Hi,

It seems Fedora 26 is not detecting my DELL R720 display adapter correctly.
Any one has experience on installing F26 in dell server R720?

Any tutorial would be helpful. trying to search but no luck.

Thanks.

@olivier said in KVM vs XenServer:

@scottalanmiller said in KVM vs XenServer:

@kuyaz said in KVM vs XenServer:

Can memory be shared also between VM?

That depends on the hypervisor. VMware ESXi can do this. It's an extremely limited feature and of little value. It's neat and good for things like VDI, typically, but not very useful for servers and there is a reason most platforms don't work towards adding it.

I concur. For most workloads, it's more a pain than a solution.

yes I just realize that my question is stupid for the RAM part

Noted with thanks.

For RAID 1 or 10 is there any limitation that :

1. HDD must be the same model?
2. Both / all must be either SAS / SATA. Can we mix SATA and SAS HDD for RAID 1 / 10 ?

Thanks.

@scottalanmiller will u recommend fedora for enterprise production server compared to Centos?
As i know, centos is more superior in term of stability for enterprise grade.

I used to be brainwashed that way

Hi all, for example my server has 16 core & 64gb RAM.

Just wondering, how many active VM I can run on those core actually? assuming for each VM I allocate 1GB, can I run 64 active VM with 1 virtual core each?

Can memory be shared also between VM?

When i said active, it is online but not in heavy usage.

@scottalanmiller from what i read, the raid hardware card may fail to perform write during the power loss hence the risk.
but if it is equipped with non-volatile flash (is it for high end card only or normally all raid card has it nowadays?), it should fine then.

the raid card also add another point of failure (if the card fail).

@scottalanmiller after i dig further, it seems enterprise ssd have power lost protection capacitor to finish write cache. So it should be safe. So theoritically, md is safer than hardware raid without bbu.

I assume the same with sata enterprise hdd also hence the price diff compared to desktop hdd.

Cmiiw.

@scottalanmiller any case that the raid is totally gone due to power lost in md? Or just acceptable file corrupt during the power lost?

Normally what happen when power is lost in md raid?

@scottalanmiller how about power lost with MD? Will it be safe and reliable compared to hardware raid with bbu?

Just info for bugs : When i zoom (pinch out) in safari ios. Sometimes it break the layout and can goes back to normal size.

Nice. Any ios apps for this forum?

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

@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?

@jaredbusch cool. Will setup it tomorrow and get back to you guys when i hit a wall

@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?

@jaredbusch ok noted with thanks. I got the idea now.

@scottalanmiller may i know why u recommed fedora more compared to centos 7? Im using centos 7 so far.

@scottalanmiller thanks. Hi, from Jakarta