Setup RAID when a new disk is installed ?

[rXp]

Hello,

I am trying Proxmox for the first time. For now I use it personally on a new microserver I got recently. If I end up liking Proxmox I will get a basic subscription but for now I am using the free repository.
I have 2 questions both related to my drives setup :
1) I have 1 SSD for the OS and 1 HDD in the raid controller. More identical HDDs will come (up to 4x4TB for a RAID 10) but right now I only have one. Is it possible to set it up and later add another to make a RAID 0 then the last two for a RAID 10 without loosing data ? I can setup in the BIOS the data for my drives but I don't if it will make me erase it all. Since I saw the RAID options in the LVM Setup I was wondering if it is a software raid or if it takes over my controller.
2) Is there a way (and is it useful) to use part of my SSD as cache for what ever Proxmox need ?

For now my microserver is a HPE Proliant microserver GEN10 x3421 with 32gb DDR4 2440, a 256ssd for the OS and a 4TB WD Gold in the bay directly connected on the raid controller.

Thanks a lot for the help,

rXp

 

[udo]

Hi,
depends on your raid-controller.
Perhaps your raidcontroller can create an raid-0 and later expand to raid-1 and raid 1+0... the local pve storage in this case is normaly lvm-thin.
The linux don't see raid-level, only the raid-volume fromn the raid-controller.

Or you use zfs for this! In this case, your raidcontroller must support path through (some vendor called non-raid). In thic case you can do the same with zfs (and the SSD can used for write- and/or read-cache).
In this case, the linux see all harddisk "as they are".
With zfs you can do nice things, but you also need more Ram.

Udo

 

[rXp]

Hi,
depends on your raid-controller.
Perhaps your raidcontroller can create an raid-0 and later expand to raid-1 and raid 1+0... the local pve storage in this case is normaly lvm-thin.
The linux don't see raid-level, only the raid-volume fromn the raid-controller.

Or you use zfs for this! In this case, your raidcontroller must support path through (some vendor called non-raid). In thic case you can do the same with zfs (and the SSD can used for write- and/or read-cache).
In this case, the linux see all harddisk "as they are".
With zfs you can do nice things, but you also need more Ram.

Udo

I have a Marvell 88SE9230 PCIe to SATA 6Gb/s controller (RAID controller).
How can I setup the SSD as cache in proxmox ?
As for the controller I don't know how it reacts if I try to add another to setup something since I only have one hdd for now.
For now all my "bay" partitions are LVM-Thin but since I am just testing it is not an issue to reset everything if needed