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Xenserver 6.2 Soft System RAID and HA-Lizard 10 years 5 months ago #133

Hi:

I've a xenserver 6.2 raid soft system. After installing it in a single disk
i made a RAID1 system following this guide: wysotsky.info/?p=106

System is now working.
Can be installed HA-Lizard in thiis environment??

In the guide some changes to the system are made, the most relevants are:

mkdir /mnt/root/initrd-raid
mkinitrd -v --fstab=/mnt/etc/fstab /mnt/root/initrd-raid/initrd-`uname -r`-raid.img `uname -r`
cd /mnt/root/initrd-raid
zcat initrd-`uname -r`-raid.img | cpio -i


and

find . -print | cpio -o -Hnewc | gzip -c > /mnt/boot/initrd-`uname -r`-raid.img
rm /mnt/boot/initrd-2.6-xen.img
cd /mnt/boot
ln -s initrd-`uname -r`-raid.img initrd-2.6-xen.img
Replace in /mnt/boot/extlinux.conf string “root=LABEL=root-…” to “root=/dev/md0″ in all menu entries.

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Xenserver 6.2 Soft System RAID and HA-Lizard 10 years 5 months ago #134

It appears the howto you followed is creating a SW RAID for the host and not any sort of shared storage. With that said:

HA-Lizard will work with basic functionality (i.e./ auto start VMs that are not running). But since there is no shared SR, starting VMs on other hosts in a pool will not be possible unless you add a SAN or use HA-Lizard+iSCSI-HA

Using HA-Lizard+iSCSI-HA should work, but depends on 2 disks.
1 - Default disk XenServer is installed on and boots from
2 - Second disk to create shared storage in the pool which is managed by HA-Lizard. In this case, the second disk could be a partition on your first disk as long as partitions are exposed in this manner:

Backing-Disk (Partition/SW-RAID/LV, etc..) -> DRBD -> TGT/iSCSI -> XenServer

Meaning XenServer should ONLY see this storage through the iscsi target interface. Each of the lower devices must be blocked per the instructions in the howto. This may be messy and can cause some problems with having to partially expose the SWRAID disk while blocking the portion of it that is used by HA-Lizard+iSCSI-HA

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Xenserver 6.2 Soft System RAID and HA-Lizard 10 years 5 months ago #135

I didn't whow all the configuration.

The system is in a software raid (i was affraid that modifications of this kind of instalation could be in conflict with ha-lizard).

I did a simple second raid with 2 additional disks /dev/cd1 and /dev/sd1 to an /dev/md1 (this is the raid i was thinking about using for the iSCSI SR).

Can i do that? No incompatibilities?

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Xenserver 6.2 Soft System RAID and HA-Lizard 10 years 5 months ago #136

Yes - a second SW RAID dedicated to HA-Lizard/iSCSI-HA should work fine.

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