Loic, > > root@ceph-node3:~# smartctl -a /dev/sdd | less > > === START OF INFORMATION SECTION === > > Device Model: ST4000NM0033-9ZM170 > > Serial Number: Z1Z5LGBX > > .. > > admin@ceph-admin:~/cluster1$ emacs -nw ceph.conf > > [osd.16] > > ... > > devs = /dev/disk/by-id/scsi-SATA_ST4000NM0033-9Z_Z1Z5LGBX-part1 > > > > I'm curious about what this is used for. The "normal" device path /dev/sdd1 can change dependent on the amount/order of disks/controllers. So, using the scsi-path (containing the serial number) is always unique: root@ceph-node3:~# ls -altr /dev/sdd1 brw-rw---T 1 root disk 8, 49 Okt 15 10:06 /dev/sdd1 root@ceph-node3:~# ls -altr /dev/disk/by-id/scsi-SATA_ST4000NM0033-9Z_Z1Z5LGBX-part1 lrwxrwxrwx 1 root root 10 Okt 15 10:06 /dev/disk/by-id/scsi-SATA_ST4000NM0033-9Z_Z1Z5LGBX-part1 -> ../../sdd1 regards Danny
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