How to get /dev/disk ?

X

xibo

Hello

I've seen hard disks being referenced by their IDs, i.e. /dev/disk/by-id/something in some threats (example) as well as the mail archives, which is IMO quite useful - partition labels do the job elsewhere but I read recommendations everywhere to use whole disks for zpool-vdevs.

My problem is, that I don't even have the /dev/disk directory to begin with. I guess it's a kernel module or config option that needs to be loaded/set (since zfsboot eventually can't access /etc/devd.conf when booting to zfs-root backed by disk-id vdevs), but I don't know which one...

... can anyone tell me?
 
I'm not on FreeBSD right now so I might be wrong but I don't think there's a /dev/disk directory. Those UFS partition IDs are somewhere else. Do a ls on /dev and cd to the different directories.
 
xibo, you have choice of two:
1) gpt-naming (you need to have GPT on your hdd)
Naming is '-l' option in gpart(8), and nodes will be located in /dev/gpt
2) ufs-naming (obviously you need to have ufs filesystem to do that)
you need -L option in tunefs(8).
The /dev/disk/by-* thing is linux-only (e.g. in thread you've linked to guy probably has created his zpool on Linux)
Also may be there will be something else, which Im not aware of.
 
UFS filesystem labels end up in /dev/ufs/something.

If it's a linux based (udev?) thing, is everyone using the probe-sequence based device identifiers (ad0, ad1, ...) for zfs, or are there some tricks?
Also, does ZFS scan the UUIDs or something alike of whole disks when adding them to a zpool, or will it reference the device identifiers directly (i.e. not be movable to another hardware disk controller)?
 
xibo said:
Also, does ZFS scan the UUIDs or something alike of whole disks when adding them to a zpool, or will it reference the device identifiers directly (i.e. not be movable to another hardware disk controller)?
Click to expand...

ZFS uses a bunch of data that can be viewed with

Code: 
root@openindiana:~# zdb -l /dev/rdsk/c4t0d0s0
--------------------------------------------
LABEL 0
--------------------------------------------
    version: 28
    name: 'rpool'
    state: 0
    txg: 54715
    pool_guid: 11493968878917956519
    hostid: 440627
    hostname: ''
    top_guid: 16793397187076719816
    guid: 16793397187076719816
    vdev_children: 1
    vdev_tree:
        type: 'disk'
        id: 0
        guid: 16793397187076719816
        path: '/dev/dsk/c4t0d0s0'
        devid: 'id1,sd@SATA_____WDC_WD2502ABYS-0_____WD-WCAT1E437770/a'
        phys_path: '/pci@0,0/pci1043,8443@11/disk@0,0:a'
        whole_disk: 0
        metaslab_array: 30
        metaslab_shift: 31
        ashift: 9
        asize: 251014152192
        is_log: 0
        create_txg: 4
<snip>
 
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