Building Out XenServer 6.5 with USB Boot and Software RAID 10

scottalanmiller

It'll do that

stacksofplates

You CAN run in RAM. But why? If anything happens the logs vanish. And it uses up memory too, but not normally all that much. But will you have it auto-rotate in some way?

I was just wondering if it's possible to do it similarly to VMware. It was more of just a question for questions sake. XenServer already takes up a gig of ram so the rest couldn't be that much. And you could send the logs somewhere else like you mentioned. It was more of just a question to see if it was possible.

scottalanmiller

You can always create a ram disk and put anything there that you want.

DustinB3403

Just did a reboot on my test system, and the RAID Array is unmounted. Meaning we need to add it to fstab.

Romo

I reboot without a problem, and the mounting of the array is managed properly by xen without the entry in fstab.

DustinB3403

On the test setup I built using the OP, the array is lost.

Along with everything on it. It's much safer to keep it stored in fstab..

Romo

Lost the whole array? That's strange that would imply something went really wrong. The entry added in fstab whould only cause the os to automount the array, nothing there should cause the array itself to get wiped.

What is the current status of your array?
mdadm --detail /dev/md0
cat /proc/mdstat

DustinB3403

This is what is in /var/run/sr-mount....

DustinB3403

This is mdadm --details

DustinB3403

and cat /proc/mdstat

scottalanmiller

@DustinB3403 said:

and cat /proc/mdstat

![0_1447077435496_2015-11-09_08-56-57.png](Uploading 100%)

patience.....

DustinB3403

Yes Yes, you're too quick some times sir. I corrected it.

DustinB3403

So with the above 3 pictures and the Array missing.

I'd obviously have to rebuild the array, and remap items. Additionally, I'll have to recreate my "backup" USB (which isn't a huge deal)

Romo

@DustinB3403 can you run

mdadm --examine --scan

scottalanmiller

We need to find the missing array before we can do anything else. As @romo mentioned we need to scan and see if the array is out there somewhere.

DustinB3403

DustinB3403

Running

    mount md0

results in

   mount: mount point /mnt/raid10 does not exist

scottalanmiller

mkdir /mnt/raid10

Romo

@DustinB3403 what is in your mdadm.conf?

DustinB3403

Can't find

    md0 in /etc/fstab or /etc/mtab