When I was looking for a document to improve I/O performance in MySQL on Azure VM, I found the following URL:
http://azure.microsoft.com/ja-jp/documentation/articles/virtual-machines-linux-optimize-mysql-perf/
I understand that RAID 0 improves I/O performance.
However, on physical servers, RAID 0 is usually a single disk failure, and RAID is damaged, so it is unreliable and uses RAID 10 and so on.
Is RAID 0 configured on Azure reliable?
(Sorry for the ambiguous question.)
Azure mirrors individual virtual DISKs in three layers, so if you configure multiple virtual disks in a RAID 0 configuration, the configuration is exactly the same as RAID 1+0.
In a little more detail, the virtual DISK of Azure VM is built on Azure Storage Blob.This blob is standard and has a triple replicated high availability configuration within the same data center.Blob has several availability configurations, including LRS, ZRS, GRS, RO-GRS, and so on, but at least triplet.Use LRS for RAID 0 configurations.
The link below describes the Software RAID, and it says something similar.
Azure Storage secrets and Linux I/O optimizations
From around P36 in the link below, there are some points to note.
http://www.slideshare.net/takekazuomi/persistence-on-azure-microsoft-azure
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