Yes, each of the LUNs was PVCREATE so that they can be added to the VG and then the LV. But the steps were as follows:
1) Create the LUNs on the Synology NAS
2) Connect to the NAS via iSCSI to see each of the LUNs.
3) Run Gdisk to partion each of the 2 new LUNs, since they are 5TB LUNs, fdisk doesn't work with them.
4) Run PVCREATE on each of the partitions /dev/sd(x)1
5) Run VGEXTEND <VG> /dev/sd(x)1
6) Run LVEXTEND <LV> -l +100%FREE
7) Run XFS_GROWFS to expand the filesystem.
8) df -h shows that the new filesystem is 30TB in size.
9) Start running program that writes data to the disk, when it hits the original 20TB size of the LV, watch it get an I/O error and crash the program.
Been attempting do run XFS_REPAIR to fix the filesystem, but it runs out of memory before it can complete.
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