In the JUSUF cloud environment there are hosts available equipped with an 800GB Samsung NVMe Access to those devices is exclusive.
NVMEs are available via PCI passthrough. Because of that, live-migrations are not supported and maintenance actions on the cloud infrastructure will affect your VMs. Do not use NVMe devices for databases and data repositories, limit the usage to short-living, reproducible computing/data-processing jobs!
In case no NVMe is left, OpenStack will fail to schedule your VM.
A VM needs to be prepared for being able to use a NVMe assigned to it.
Please pick one of the NVMe flavors mentioned at Quick Introduction.
Create a VM with the Centos 8.2 image and a NVMe flavor. You might take a look on the First Steps Page.
$ openstack server create --flavor gpp-ssd.l --security-group your_group --key-name your_key --network your_net --image CentOS-8-GenericCloud-8.2.2004-20200611.2.x86_64 nvme-vm
Access/Mount the NVMe
The NVMe is directly accessible, if you want to take a look on its device:
$ sudo dnf install pciutils $ lspci -v | grep Samsung 00:05.0 Non-Volatile memory controller: Samsung Electronics Co Ltd NVMe SSD Controller SM981/PM981/PM983 (prog-if 02 [NVM Express]) Subsystem: Samsung Electronics Co Ltd Device a801
The blockdevice it offers is as well shown via
$ lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT vda 253:0 0 20G 0 disk -vda1 253:1 0 20G 0 part / nvme0n1 259:0 0 894.3G 0 disk -nvme0n1p1 259:1 0 894.3G 0 part
and can be mounted right away via
$ sudo mount /dev/nvme0n1p1 /mnt $ [centos@name-webinar ~]$ sudo dd if=/dev/zero of=/mnt/testfile.dat bs=1G count=1 oflag=direct 1+0 records in 1+0 records out 1073741824 bytes (1.1 GB, 1.0 GiB) copied, 1.47561 s, 728 MB/s