Virtual machines

2015-02-04 00:00:00
4 FEB

We are increasingly confronted with raid systems that run virtual machines.

The benefits for the user are many; the main advantage is that several servers can be run on one raid system.

However, if something happens to the raid, it is much more complex to solve this.

Recently we still had a raid with 8 1 TB drives that were in raid 10, containing 8 virtual volumes of 460 GB that were together in jbod via iScsi. So a virtual raid in a physical raid.

It goes without saying that this was a nightmare scenario. Solving the physical raid was done quite quickly, but then reconstructing the virtual raid was an order of magnitude more difficult.

It was not an ordinary jbod, but a kind of jbod where the mutual offsets were variable.

A great invention by VMware that allows you to easily increase the virtual volume. However, there is no documentation available, so we had to figure everything out ourselves.

We ultimately managed to get the customer's data back, but the efforts required for this were many times higher than with a physical raid. Anyone who installs such a system should therefore also have a reliable backup!

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