Install Ceph on dell PowerEdge 720 with perc

tru64guru

New Member
Sep 10, 2021
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I am new to proxmox , I have 5x DELL PE 720 with 10 internal disks managed by PERC controller.

I created RAID1 and installed proxmox OS on the RAID1 .. I have the cluster created now..

My question is : How to make the other 8 disks on each host visible to ceph ? Do I create RAID0 out of each disk ?

Appreciate feedback

Thanks
 

TECNI.sistemas

New Member
Sep 11, 2021
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Hello, we also have a DELL PE R720, with a PERC H710 RAID controller, we are not using ceph, in our case we use LVM and create in the controller menu with ctl + R three RAID1, 1TB SSD for Proxmox, 2TB DATA HDD, and SSD 256GB CACHE and SWAP, to see the DATA CACHE and SWAP disks it is necessary to create the LVM and add them to the storage, we have it like this:
1631344339561.png

In your case as you don't want a RAID1, then you can use the suggested option with HBA mode, and with LVM Thin create the volume you want, it can be something like this:

echo -e "w\ny\n" | gdisk /dev/sdb
echo -e "w\ny\n" | gdisk /dev/sdc
...
echo -e "w\ny\n" | gdisk /dev/sXY
wipefs -a /dev/sdb
wipefs -a /dev/sdc
...
wipefs -a /dev/sXY
pvcreate /dev/sdb /dev/sdc ... /dev/sXY
vgcreate data /dev/sdb /dev/sdc ... /dev/sXY
lvcreate -L VOLUMEN_SIZET -T -c 64k data/data data



and add this:
1631347704726.png

This is our configuration, maybe it is a good alternative to CEPH, we do not know, I hope it will help you
 
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tru64guru

New Member
Sep 10, 2021
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Thanks for all replies , actually the goal is to use proxmox cluster to build VMs running kubernetes . My understanding is we need unified filesystem like ceph configured (equivalent to VSAN in vmware). Is there alternative that achieve same result ?

Thanks again for help
 

tru64guru

New Member
Sep 10, 2021
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@SkyDiver79 we are going to use proxmox , I meant to ask if I can get proxmox with ceph with underlying disk created by RAID. If I can't use ceph with perc in raid mode , what are the the other proxmox unified storage options give use case ?
 

SkyDiver79

Member
Aug 2, 2021
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Damme, Germany
roesing-consulting.de
All HCI storage virtualizations like VMware VSAN, Microsoft S2D and Ceph need the disks natively without a Raid controller.

If you want to use HCI with hardware raid, you have to use a paid solution like StorMagic or DataCore.

If replication is enough for you, you can also use your hardware raid with ZFS.
 

bbgeek17

Member
Nov 20, 2020
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www.blockbridge.com
While there are a few alternatives to Ceph, namely GlusterFS, neither is designed for use on a RAID'ed local disk. The distributed file systems are built with distributed data protection in mind. They replicate data for recovery from component failure, which means the blocks are replicated more than once in many cases.
Your local RAID will be replicating blocks locally (except R0 of course) and then Ceph/GlusterFS will be doing it on top of it. It doesnt sound like your disks are SSD so performance will be pretty bad.

If you cant change your controller to HBA only mode, where disks are exposed to OS directly, perhaps 8 R0 would do the trick, if it even allows you to create single disk R0. I foresee trouble doing disk replacements - how will perc react to single disk R0 failure? will you have to take the system down to reconfigure everything? In short, its not recommended...

As @SkyDiver79 mentioned, the other alternatives are commercial products. Stormagic might be an option - it appears to run inside a VM on top of your hypervisor. Personally, I think you want the storage layer to be as close to raw hardware as possible. Datacore server only runs on windows. Based on what you said, I don't think that's an option.

For us, Blockbridge, we'd want to run on a dedicated server platform https://www.blockbridge.com/platforms/. Isolating storage from compute will prevent competition between the two for the resources.


Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox
 
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