Alternative is to use modify -t plain, but that requires instance reboot.
+root@lib28:~# vgremove ffzgvg
+
+root@lib28:~# pvremove /dev/bcache0
+
+
+
+Then, we need to find bcache block device and deactiate it:
+
+root@lib28:~# cd /sys/fs/bcache/
+root@lib28:/sys/fs/bcache# cd 4a61e966-f18d-4fab-836a-3ff027963781/
+
+root@lib28:/sys/fs/bcache/4a61e966-f18d-4fab-836a-3ff027963781# ls -al bdev0
+lrwxrwxrwx 1 root root 0 Sep 19 19:46 bdev0 -> ../../../devices/pci0000:00/0000:00:02.2/0000:03:00.0/host0/target0:2:0/0:2:0:0/block/sdb/bcache
+
+
+root@lib28:~# echo 1 > /sys/block/sdb/bcache/stop
+[Wed Sep 19 20:05:53 2018] bcache: bcache_device_free() bcache0 stopped
+
+root@lib28:~# megacli -CfgDsply -a0
+
+
+Erase existing config
+
+root@lib28:~# megacli -CfgLdDel -L0 -a0
+
+Adapter 0: Deleted Virtual Drive-0(target id-0)
+
+Exit Code: 0x00
+
+
+Convert all disks to jbod
+
+root@lib28:~# megacli -PDMakeJBOD -PhysDrv[32:0] -a0
+
+Adapter: 0: EnclId-32 SlotId-0 state changed to JBOD.
+
+Exit Code: 0x00
+
+root@lib28:~# megacli -PDMakeJBOD -PhysDrv[32:1] -a0
+
+...
+
+megacli -PDMakeJBOD -PhysDrv[32:6] -a0
+
+Adapter: 0: Failed to change PD state at EnclId-32 SlotId-6.
+
+Exit Code: 0x01
+
+
+This probably means that it has foreign config (makes sense, 7th disk
+comes from another server with raid on it):
+
+root@lib28:~# megacli -CfgForeign -Clear 0 -a0
+
+Foreign configuration 0 is cleared on controller 0.
+
+Exit Code: 0x00
+
+
+root@lib28:~# megacli -PDMakeJBOD -PhysDrv[32:6] -a0
+
+Adapter: 0: EnclId-32 SlotId-6 state changed to JBOD.
+
+Exit Code: 0x00
+
+
+root@lib28:~# lsblk --scsi -m
+NAME HCTL TYPE VENDOR MODEL REV TRAN NAME SIZE OWNER GROUP MODE
+sda 0:0:7:0 disk ATA INTEL SSDSC2BW24 DC32 sda 223.6G root disk brw-rw----
+sdb 0:0:0:0 disk ATA ST1000NM0033-9ZM GA0A sdb 931.5G root disk brw-rw----
+sdc 0:0:1:0 disk ATA ST1000NM0033-9ZM GA0A sdc 931.5G root disk brw-rw----
+sdd 0:0:2:0 disk ATA ST1000NM0033-9ZM GA0A sdd 931.5G root disk brw-rw----
+sde 0:0:3:0 disk ATA ST1000NM0033-9ZM GA0A sde 931.5G root disk brw-rw----
+sdf 0:0:4:0 disk ATA ST1000NM0033-9ZM GA0A sdf 931.5G root disk brw-rw----
+sdg 0:0:5:0 disk ATA ST1000NM0033-9ZM GA0A sdg 931.5G root disk brw-rw----
+sdh 0:0:6:0 disk ATA ST1000NM0033-9ZM GA0A sdh 931.5G root disk brw-rw----
+
+root@lib28:~# mdadm --create /dev/md0 --level=10 --raid-devices=7 /dev/sd{b,c,d,e,f,g,h}
+mdadm: cannot open /dev/sdb: Device or resource busy
+root@lib28:~# lsblk
+NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
+sda 8:0 0 223.6G 0 disk
+├─sda1 8:1 0 260M 0 part /boot/efi
+├─sda2 8:2 0 10G 0 part /
+└─sda3 8:3 0 213.3G 0 part
+sdb 8:16 0 931.5G 0 disk
+└─bcache0 254:0 0 931.5G 0 disk
+sdc 8:32 0 931.5G 0 disk
+└─bcache1 254:1 0 931.5G 0 disk
+sdd 8:48 0 931.5G 0 disk
+sde 8:64 0 931.5G 0 disk
+sdf 8:80 0 931.5G 0 disk
+sdg 8:96 0 931.5G 0 disk
+sdh 8:112 0 931.5G 0 disk
+
+Duh!
+
+root@lib28:~# wipefs /dev/sda
+offset type
+----------------------------------------------------------------
+0x1018 bcache [other]
+ UUID: 2dbf6232-0e89-4d7b-87c7-79897b0a34f2
+
+root@lib28:~# wipefs /dev/sdb
+offset type
+----------------------------------------------------------------
+0x1018 bcache [other]
+ UUID: 2dbf6232-0e89-4d7b-87c7-79897b0a34f2
+
+root@lib28:~# echo 1 > /sys/block/sda/bcache/stop
+root@lib28:~# [Wed Sep 19 20:25:14 2018] bcache: bcache_device_free() bcache0 stopped
+
+root@lib28:~# echo 1 > /sys/block/sdb/bcache/stop
+root@lib28:~# [Wed Sep 19 20:25:20 2018] bcache: bcache_device_free() bcache1 stopped
+
+root@lib28:~# lsblk
+NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
+sda 8:0 0 931.5G 0 disk
+sdb 8:16 0 931.5G 0 disk
+sdc 8:32 0 931.5G 0 disk
+sdd 8:48 0 931.5G 0 disk
+sde 8:64 0 931.5G 0 disk
+sdf 8:80 0 931.5G 0 disk
+sdg 8:96 0 931.5G 0 disk
+sdh 8:112 0 223.6G 0 disk
+├─sdh1 8:113 0 260M 0 part /boot/efi
+├─sdh2 8:114 0 10G 0 part /
+└─sdh3 8:115 0 213.3G 0 part
+
+root@lib28:~# mdadm --create /dev/md0 --level=10 --raid-devices=7 /dev/sd{a,b,c,d,e,f,g}
+mdadm: Defaulting to version 1.2 metadata
+mdadm: array /dev/md0 started.
+
+
projects / gnt-info / commitdiff