Hi,
we plan to use Dl380Gen10 servers for our new SuSE OpenStack Cloud / SuSE Enterprise Storage (Ceph). As NVMes are getting cheaper and it would eliminate the need for array controllers we think about an all-NVMe setup with 2 NVMEs for boot (SLES) and 2 or more NVMes for Ceph OSD's
I found this HPE document:
https://h20195.www2.hpe.com/v2/getpdf.aspx/4aa6-3464enw.pdf
Q: Can NVMe drives be used for operating system boot purposes?
A: NVMe 2.5" SSDs work in UEFI and legacy modes, but there is no boot support at this time. The drive performance would be best used for
workloads that demand faster data access
Also, Hot Swap seems to supported, but not Hot Add.
Questions:
- with NVMes only software RAID is possible?
- is it now possible to boot SLES from NVMe and a sw raid1? I heard that this should be woking with SES.
- Hot Swap is nice, but a downtime for Hot Add (Expansion) is not so nice, is this still the case?
- what about the bandwith needed for a large number of NVMe devices? What is the bottlenck if we want to put 10+ NVMes in a serve? PCI bus?
Anyone here using (all) NVMes setup with SLES or any other Linux, how is this working is operations? Other things than the mentioned that I should think about?