Hi! Thank you for the answer. I have been reading the "PowerVault MD3000 and MD3000i Array Tuning Best Practices" and in matter of Performance seems that the answer is: Isolated Disk Groups with a minimum number of Virtual Disk (Only one ideally). That was my first option but now I have to decide if we can sacrifice some performance in order to have more space. The eternal doubt :) I will try to benchmark the two options if I have enough time. cheers, ------------------- From: i.dell.com/.../PowerVault_MD3000_and_MD3000i_Array_Tuning_Best_Practices.pdf (page 9 - Virtual Disk Location and Capacity) "Virtual disks are aligned in series within a Disk Group with the first virtual disk starting in the fastest outer regions and progressing inwards. When taking this into account, a disk group should be designed with as few virtual disks as possible.   Dell™ does not recommend using more than four virtual disks or repositories per disk group for peak performance. Additionally, where performance is critical, isolate virtual disks to separate disk groups as possible.   When multiple high-traffic virtual disks share a disk group, even with purely sequential usage models, the disk group I/O behavior becomes increasingly random, lowering overall performance. Additionally, when a disk group must be shared, the most heavily trafficked virtual disk always should be located at the beginning of a disk group."
Hello, I have a doubt about how to configure my MD3000 to work with a MySQL server. I am thinking in two possible configurations, but I am not sure what would be the best. My first option is the following: One Raid 1 Disk Group (2 x 450 GB HDs) with the corresponding Virtual Disk for the Databases. One Raid 1 Disk Group (2 x 450 GB HDs) with the corresponding Virtual Disk for the Logs. One Raid 5 Disk Group (3 x 450 GB HDs) with the corresponding Virtual Disk for Backups. One disk (450 GB) as Spare. The other option is to create a large Raid 5 with 7 drives and left the other as spare. Then I could create different Virtual Disks for databases, logs and backups. With this option I get more space and I think is more flexible, but I guess that it is lees good in terms of performance. What do you think?  Thanks in advance!
What is better? Virtual Disks vs. Disks Groups