seeeking wrote:
Hi Folks!
i have a doubt, right now i have a 3par 7450 with 24 SSD
8 disk 1.92TB
16 disk 480GB
We are using a CPG Raid 5 (3+1), and now are are looking for adding new disk, so here is my doubt.
I want to buy 6 disk of 1.92TB, but the HPE seller is telling me that is a bad practice, i should buy 8 disk of 1.92tb regarding to the Raid configured in the CPG, i asked why, because the raid is performed with chunklets, not the entire disk as legacy systems but i have no answer.
I was wondering if you guys can help me with disk, those disk are very expensive.
Best Regards!
The quick and dirty answer.. With 16 disks you can write 4 full stripes, while with 14 you only get to write 3 because the two last drives in the final stripe is busy writing one of the other 3 stripes. So it is only a performance related best practice.