Building Out XenServer 6.5 with USB Boot and Software RAID 10

scottalanmiller

Nothing wrong with RAID 1!

Alex Sage

Will this guide work with CentOS 7?

DustinB3403

@aaronstuder said:

Will this guide work with CentOS 7?

It likely would, but you'll have to test it to find out.

scottalanmiller

@aaronstuder said:

Will this guide work with CentOS 7?

To do what with CentOS 7? Do you want to install CentOS to a USB stick? Or are you just looking for the MD RAID portion?

scottalanmiller

We need to make this guide again with XS7.

DustinB3403

Has anyone attempted this guide on XS7? Confirming what works and what doesn't.

Alex Sage

@DustinB3403 I'll try it tomorrow night.

scottalanmiller

@DustinB3403 I'll try it tomorrow night.

Thanks

Alex Sage

@scottalanmiller Well, change of plans, I ordered 32GB more RAM and 2 New 64GB thumbdrives, which will be here Saturday. Will upgrade then and test

DustinB3403

There appears to be a bug with XS7 and upgrading / using an existing MD array.

Alex Sage

@DustinB3403 Interesting. I will be starting fresh... Would you like to to try a upgrade as well?

DustinB3403

@aaronstuder Tried upgrading, and I'm getting several errors on my test system. Which ran XS6.5 just fine.

Going to try again and see what happens, this time not using the existing array, but the same boot device.

Alex Sage

@DustinB3403 Ah, I see. Have you tried a fresh install?

DustinB3403

@aaronstuder Working on that now.

DustinB3403

It looks as though I'm going to have to clean the drives that are a part of the old array before I can proceed. I'm getting an error

 no such file or directory: '/sys/block/md127p1'

Alex Sage

@DustinB3403 Bummer. On a side note, how do I quickly remove all partitions on a drive in Linux? I want a blank drive with nothing on it

DustinB3403

@DustinB3403 Bummer. On a side note, how do I quickly remove all partitions on a drive in Linux? I want a blank drive with nothing on it

I'm assuming on the software array, correct?

mdadm --stop /dev/md0
mdadm --remove /dev/md0
mdadm --zero-superblock /dev/sda    (per drive)
sfdisk -d /dev/sda | sfdisk /dev/sdb

travisdh1

@aaronstuder

parted /dev/device
rm 1

Repeat rm for each partition on the drive.

Edit: @DustinB3403 method is better if it's an mdadm array.

Alex Sage

DustinB3403

I had to erase each of the disks before being able to proceed.

So if this were a production system or other system that you really want your VM's from take a backup.