We use a HDS Thunder 9200 SAN configured at the back end with two RAID-1 groups (2 hard disks in each group). However,...
By submitting your personal information, you agree that TechTarget and its partners may contact you regarding relevant content, products and special offers.
I can actually see three LUNs at the OS level. I don't quite understand, because I think each RAID group should be a LUN by itself. In this instance, one of the RAID groups obviously consists of two LUNs. Is that possible?
Yup. The Thunder 9200 supports the notion of parity groups and RAID groups. RAID groups can contain single or multiple parity groups. You can think of the RAID group as the actual RAID container for data protection, and the parity group as a partition of that container. This way, multiple LUNs can be created from each RAID group, and ported out to the same or different servers. This allows granularity in LUN sizes being obtained from the RAID group.
If each partition (parity group) is assigned to the same server, there should be no contention for the RAID group's disk resources. You can always just use the entire RAID group as a single parity group and create one big LUN.
Dig Deeper on RAID
Related Q&A from Christopher Poelker
RAID can allow for better storage performance and higher availability, and there are many different RAID types. Read a comparison of RAID levels, as ...continue reading
SAN expert Chris Poelker discusses how to change the size of a LUN in a Microsoft cluster server environment.continue reading
SAN expert Chris Poelker compares connecting a SAN with wavelength cabling and dark fiber and discusses the pros and cons of each.continue reading
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.