Question Can I build two differents type of RAID on a Server?

[Armen_71]

I have a server Dell PowerEdge R740 with RAID controller PERC H730P.
Can I build RAID 1 with 2 SSD for OS and RAID 10 with 4 SSD for data base SQL? Will I have any problem with server's functionality?
Thanks

 

[aigomorla]

Yes you can mix different arrays on the same controller.

No you wont have problems, as the array is dependant on the SAS controller, unless you are going software raid, which again shouldn't matter.

 

[Armen_71]

Thank you aigomorla !

 

[Snakexor]

I will add that if all of the SSDs are the same size that you will see better overall performance with OBR10 setup. One big RAID 10. You will get higher performance across the board and maintain full redundancy. This is general recommendation based on my reading.

 

[Armen_71]

Thank you Snakexor

 

[TimSheetz]

I wouldn't use RAID 1.

We recently had 2 backup servers that comprised our backup solution. They were put online within a day of each other and both had SSDs in a RAID 1. One drive failed on one then 8 hours later the other drive failed before I could replace the first drive. We completely lost that location. Oh well atleast we have one location working. Three days later the first drive failed at that location and just a couple hours later the other drive failed. We were hard down for two months with no way to backup or restore. Luckily the data volumes were mechanical HDDs so we did eventually get the data back. Ive known other people who have had this happen. SSDs have an exact number of writes. Putting them in a RAID 1 makes no sense because they do not have the bell curve failure rate mechanical disks do. If you have done this not thinking (like I did), go ahead and pull out your redundant RAID disk and replace it with a new one to stagger the failures and save your sanity. You can argue theory all day or so that you are a very lucky person or whatever but this is real life. SSDs do not have the same characteristics as the old spindle disks so we need to stop using old safeguards for new technologies.