Mounting a PowerFlex Volume on Linux’s SDC Boot shows how to properly configure the /etc/fstab file to mount a PowerFlex Volume during the system’s boot.
Our PowerFlex Cluster has the 4.5.2 version and runs on a virtual environment (nested). Our SDC is a Ubuntu-based Linux!
1- The first step is to identify the disk partition to be mounted. In this case, for instance, the disk partition is /dev/scinia1:
lsblk --path
Output example:
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
/dev/loop0 7:0 0 44.3M 1 loop /snap/snapd/23258
/dev/loop1 7:1 0 49.8M 1 loop /snap/snapd/18357
/dev/loop2 7:2 0 91.9M 1 loop /snap/lxd/29619
/dev/loop3 7:3 0 91.8M 1 loop /snap/lxd/24061
/dev/loop4 7:4 0 63.3M 1 loop /snap/core20/1828
/dev/loop5 7:5 0 63.7M 1 loop /snap/core20/2434
/dev/sda 8:0 0 16G 0 disk
├─/dev/sda1 8:1 0 1M 0 part
├─/dev/sda2 8:2 0 1.8G 0 part /boot
└─/dev/sda3 8:3 0 14.2G 0 part
└─/dev/mapper/ubuntu--vg-ubuntu--lv 253:0 0 10G 0 lvm /
/dev/sr0 11:0 1 1024M 0 rom
/dev/scinia 252:0 0 64G 0 disk
└─/dev/scinia1 252:1 0 64G 0 part
/dev/scinib 252:16 0 8G 0 disk
/dev/scinic 252:32 0 8G 0 disk2- Next, we need to grab the disk-id absolute path:
ls -ld /dev/disk/by-id/*As we can see in the following output, the absolute disk path for /dev/scinia1 is “/dev/disk/by-id/emc-vol-8c40194f563e090f-29039d3800000001-part1” (this is the information that we will need later):
lrwxrwxrwx 1 root root 9 Dec 20 14:44 /dev/disk/by-id/ata-VMware_Virtual_SATA_CDRW_Drive_00000000000000000001 -> ../../sr0
lrwxrwxrwx 1 root root 10 Dec 20 14:44 /dev/disk/by-id/dm-name-ubuntu--vg-ubuntu--lv -> ../../dm-0
lrwxrwxrwx 1 root root 10 Dec 20 14:44 /dev/disk/by-id/dm-uuid-LVM-Sp2h5MStgFIAzTpa0H7f433s1hpXDDYrgM1fUXunm5UxO96Vc0DOIiwlcJ1eH3h6 -> ../../dm-0
lrwxrwxrwx 1 root root 12 Dec 20 14:46 /dev/disk/by-id/emc-vol-8c40194f563e090f-2900b70600000004 -> ../../scinic
lrwxrwxrwx 1 root root 12 Dec 20 14:46 /dev/disk/by-id/emc-vol-8c40194f563e090f-2900b70700000006 -> ../../scinib
lrwxrwxrwx 1 root root 12 Dec 20 14:46 /dev/disk/by-id/emc-vol-8c40194f563e090f-29039d3800000001 -> ../../scinia
lrwxrwxrwx 1 root root 13 Dec 20 14:46 /dev/disk/by-id/emc-vol-8c40194f563e090f-29039d3800000001-part1 -> ../../scinia1
lrwxrwxrwx 1 root root 10 Dec 20 14:44 /dev/disk/by-id/lvm-pv-uuid-avF020-i9IU-vIJZ-S3bC-QvSE-FAM5-auO3w5 -> ../../sda33- Edit the configuration file /etc/fstab (you can use your preferred text editor) and add the following entry:
/dev/disk/by-id/emc-vol-8c40194f563e090f-29039d3800000001-part1 /mnt/linux-vol-01 ext4 _netdev,x-systemd.requires=scini.service 0 0Where:
/dev/disk/by-id/emc-vol-8c40194f563e090f-29039d3800000001-part1 –> Disk partition
/mnt/linux-vol-01 –> Mount point
ext4 –> Filesystem
_netdev,x-systemd.requires=scini.service –> The SDC access the volume through network. So, network and SDC service must be available first (both options help with it)
4- Reboot and test!
df -Th
Output example:
root@pfmp-sdc-01:~# df -Th
Filesystem Type Size Used Avail Use% Mounted on
tmpfs tmpfs 96M 1.2M 95M 2% /run
/dev/mapper/ubuntu--vg-ubuntu--lv ext4 9.8G 5.7G 3.6G 62% /
tmpfs tmpfs 479M 0 479M 0% /dev/shm
tmpfs tmpfs 5.0M 0 5.0M 0% /run/lock
/dev/sda2 ext4 1.7G 191M 1.4G 12% /boot
/dev/scinia1 ext4 63G 24K 60G 1% /mnt/linux-vol-01
tmpfs tmpfs 96M 4.0K 96M 1% /run/user/0That’s it 🙂