Hello again!!
I'm running my first tests in our new 8440 array. I'm new to the deduplication feature (system is at 3.2.2 firmware so no compression yet).
I've created a LUN to present it to a Windows physical server and try to move data on it. All Ok, deduplications savings say near 0 but is normal because I copied in a veeam backup that is already deduped and compressed.
Later I tried some user files...very few data but ok.
The "problem" is that I have deleted the VV but I continue to see almost 100GB of occupation in the CPG (all data I moved for testing). So it's like is not recovering space after volumes deletion.
Is this behaviour related to deduplication in any way?? What I have to do to have all the space back to free?? I asume deleting the CPG will clear all data but it should exist another way, isn't it??
Also another question... which RAID level and set size for 20 x 1,92TB SSD??
HP says in his Best Practices document:
Solid-state drive CPGs
Best practice: Solid-state drive (SSD) CPGs should be of the RAID 6 type with the default set size. This will bring superior performance/capacity ratio and 7+1 on systems that have enough SSDs to support 7+1. If maximum performance is required, use RAID 1.
So this information is incorrect because a 7+1 is a RAID 5, not a RAID 6. Which part is incorrect?? the RAID 6 or the 7+1??
The technician who installed the array told me that RAID 5 was fine and that I could make the set size bigger than default.
For me RAID 5 (7+1) sounds well. Is this a good configuration for 20 disks??
BR.
EDIT: LOL! I have created and removed two more LUNs, and launched a compact CPG in the console and now says 0% occupation, so it seems I only need recommendations for the second question.