Frank, Up to this point, I've not seen this used ... So, I recommend a "test" system until you are comfortable and a backup of your "/". But, on a lab Guest, I find:
Using Btrfs with Multiple Devices https://btrfs.wiki.kernel.org/index.php/Using_Btrfs_with_Multiple_Devices # mkfs.btrfs /dev/dasdc1 # mount /dev/dasdc1 /mnt # mkfs.btrfs /dev/dasdd1 # df | head -1; df | grep mnt Filesystem 1K-blocks Used Available Use% Mounted on /dev/dasdc1 7212144 16704 6462208 1% /mnt # btrfs device add -f /dev/dasdd1 /mnt s390sles12:~ # df | head -1; df | grep mnt Filesystem 1K-blocks Used Available Use% Mounted on /dev/dasdc1 14424288 16704 13673280 1% /mnt Mike O'Reilly IBM Linux Change Team "Frank M. Ramaekers" <FRamaekers@ailif To e.com> LINUX-390@VM.MARIST.EDU Sent by: Linux on cc 390 Port <linux-...@vm.mar Subject IST.EDU> Adding DASD to a btrfs 08/13/2015 07:08 AM Please respond to Linux on 390 Port <linux-...@vm.mar IST.EDU> I'm new to both SLES (12 in my case) and btrfs. I just recently installed SLES 12 onto a 3390-9 (I had an additional 3390-9, but didn't see a way to combine the two into a single fs). I want to add the other 3390-9 to the btrfs (/) for expansion purposes. lsdasd Bus-ID Status Name Device Type BlkSz Size Blocks ======================================================================== ====== 0.0.0301 active dasda 94:0 FBA 512 512MB 1048576 0.0.0300 active dasdb 94:4 FBA 512 256MB 524288 0.0.0100 active dasdc 94:8 ECKD 4096 7042MB 1802880 0.0.0101 active dasdd 94:12 ECKD 4096 7042MB 1802880 Number Start End Size File system Flags 1 98.3kB 210MB 210MB ext2 2 210MB 7385MB 7175MB btrfs Filesystem Size Used Avail Use% Mounted on /dev/dasdc2 6.7G 3.6G 2.9G 56% / devtmpfs 313M 4.0K 313M 1% /dev tmpfs 320M 20K 320M 1% /dev/shm tmpfs 320M 5.5M 315M 2% /run tmpfs 320M 0 320M 0% /sys/fs/cgroup /dev/dasdc2 6.7G 3.6G 2.9G 56% /var/tmp /dev/dasdc2 6.7G 3.6G 2.9G 56% /var/opt /dev/dasdc2 6.7G 3.6G 2.9G 56% /var/log /dev/dasdc2 6.7G 3.6G 2.9G 56% /var/spool /dev/dasdc2 6.7G 3.6G 2.9G 56% /var/lib/pgsql /dev/dasdc2 6.7G 3.6G 2.9G 56% /var/lib/mailman /dev/dasdc1 194M 24M 161M 13% /boot/zipl /dev/dasdc2 6.7G 3.6G 2.9G 56% /var/lib/named /dev/dasdc2 6.7G 3.6G 2.9G 56% /usr/local /dev/dasdc2 6.7G 3.6G 2.9G 56% /var/crash /dev/dasdc2 6.7G 3.6G 2.9G 56% /srv /dev/dasdc2 6.7G 3.6G 2.9G 56% /tmp /dev/dasdc2 6.7G 3.6G 2.9G 56% /opt /dev/dasdc2 6.7G 3.6G 2.9G 56% /home /dev/dasdc2 6.7G 3.6G 2.9G 56% /boot/grub2/s390x-emu TIA, Frank M. Ramaekers Jr. | Systems Programmer | Information Technology | American Income Life Insurance | 254-761-6649 ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/ ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/
