HP Proliant ML 350 g9 best practice

[stefanogatto]

hi all,
I get a server with three hot-swap disks to configure them in RAID5, can someone tell me what's the best practice to install proxmox on a HP proliant ML 350 g9 with P440 RAID controller? Should I configure the server with its raid controller p440 in raid 5 or set them in ahci and have proxmox controlling the three disks?
I think about a disk failing ( probably it will happen ) in the future, what's the easier configuration to diagnose this kind of problem and to recover it? Obviously i won't have to shutdown the machine to swap disks nor to test their S.M.A.R.T conditions
tya
Stefano

 

[sumsum]

Use the P440 Raid Controller and configure RAID 0+1. avoid RAID 5 if you can or if you relay on I/O.

 

[stefanogatto]

Use the P440 Raid Controller and configure RAID 0+1. avoid RAID 5 if you can or if you relay on I/O.

what's bad about RAID5?

 

[sumsum]

Decrease in Write Performance.

 

[stefanogatto]

ah I know but we have small disks....maybe I will change the disks and the RAID logical volume in the future
tyvm
Stefano

 

[mir]

what's bad about RAID5?

RAID5 is generally not recommended since RAID5 means you can only loose one disk. Since disk sizes has increased dramatically it can take hours or even days to synchronize a new disk and as long as synchronization is going on you risk your entire array should another disk fail. For this reason RAID6 is the recommended RAID array today (in RAID 6 you can loose two disk without loosing your array).

This means:
If write speed and IOPS is important: RAID10 (RAID 0+1)
If maximum storage size is important: RAID6