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Full Discussion: How to map device to mount point?
Operating Systems Solaris How to map device to mount point? Post 303024690 by gull04 on Monday 15th of October 2018 06:27:02 AM
Old 10-15-2018
Hi Sean,

I have had a little think about this problem during my break and I now realise that the information that you are looking for will not be easy to come by, the nature of ZFS makes it increasingly difficult as you add more disks to the zpool.

ZFS dynamically creates a block to vdev relationship based on block size (recordsize) and the number of disks in the pool. So if we create a pool with four disks and a block size of 128k (default), the blocks are allocated basically on a round robin basis across the four disks.

So identifying a file system to vdev relationship will not be easy, you could tackle it like this;

Code:
root@fvssphsun01:~# zfs list
NAME                              USED  AVAIL  REFER  MOUNTPOINT
rpool                             325G   224G  73.5K  /rpool
rpool/ROOT                       9.29G   224G    31K  legacy
rpool/ROOT/s11331                9.20G   224G  4.13G  /
rpool/ROOT/s11331/var            3.07G  60.9G  1.69G  /var
rpool/ROOT/solaris               92.9M   224G  2.93G  /
rpool/ROOT/solaris/var           7.08M  64.0G  1.32G  /var
rpool/S11.3_GA                     31K   224G    31K  /Shared/S11.3_GA
rpool/S11.3_REPO                  134G   224G   134G  /export/s11repo
rpool/S11.3_SRU_17.5               31K   224G    31K  /Shared/S11.3_SRU_17.5
rpool/VARSHARE                   9.47G   224G  36.8M  /var/share
rpool/VARSHARE/pkg               9.43G   224G    32K  /var/share/pkg
rpool/VARSHARE/pkg/repositories  9.43G   224G  9.43G  /var/share/pkg/repositories
rpool/VARSHARE/zones               31K   224G    31K  /system/zones
rpool/backup                      144K   224G   144K  /backup
rpool/backups                      31K   224G    31K  /backups
rpool/dump                        132G   228G   128G  -
rpool/export                     8.08G   224G    33K  /export
rpool/export/home                8.08G   224G  4.04G  /export/home
rpool/export/home/e400007        44.1M   224G  44.1M  /export/home/e400007
rpool/export/home/e415243        4.00G   224G  4.00G  /export/home/e415243
rpool/patrol                     2.84G   224G  2.84G  /usr/local/patrol
rpool/patroltmp                  1.27M   224G  1.27M  /usr/local/patrol/tmp
rpool/swap                       16.5G   225G  16.0G  -
rpool/swap2                      12.4G   225G  12.0G  -
root@fvssphsun01:~# dd if=/dev/zero of=/export/home/e415243/test bs=128k count=1
1+0 records in
1+0 records out
root@fvssphsun01:~# zdb -dddddddd rpool/export/home/e415243/test
zdb: can't find 'rpool/export/home/e415243/test': No such file or directory
root@fvssphsun01:~# zdb -dddddddd rpool/export/home/e415243 > /export/home/e415243/tmp/delete_me

Now you have to go and have a look at the output and find what you want - but be warned;

Code:
root@fvssphsun01:~# cd /export/home/e415243/tmp
root@fvssphsun01:/export/home/e415243/tmp# ls -l
total 6153
-rw-r--r--   1 root     root     3072629 Oct 15 13:03 delete_me
root@fvssphsun01:/export/home/e415243/tmp#

Getting the required output;

Code:
  Object  lvl   iblk   dblk  dsize  lsize   %full  type
        73    1    16K   128K   128K   128K  100.00  ZFS plain file (K=inherit) (Z=inherit)
                                        168   bonus  System attributes
        dnode flags: USED_BYTES USERUSED_ACCOUNTED
        dnode maxblkid: 0
        path    /test
        uid     0
        gid     0
        atime   Mon Oct 15 13:00:33 2018
        mtime   Mon Oct 15 13:02:29 2018
        ctime   Mon Oct 15 13:02:29 2018
        crtime  Mon Oct 15 13:00:33 2018
        gen     3333994
        mode    0100644
        size    131072
        parent  4
        links   1
        pflags  0x40800000204
Indirect blocks:
                 0 L0 0:0x6633a25a00:0x20000 0x20000L/0x20000P F=1 B=3334017/3334017 ---

                segment [000000000000000000, 0x0000000000020000) size  128K

Where I have a single line across the bottom (beginning with 0), your pool should show 5 lines - one for each vdev you should be able to see which vdev the output was written to. If you write a file bigger than 640K it will write at least one block to each - zfs manages that bit. As for the zfs file systems they are striped across however many disks are in the pool.

Can you tell us what the hardware is, this looks suspiciously like the view from inside an ldom.

Please post the output from echo | format (or a part of it if it's too big ) and if possible /usr/sbin/virtinfo -a this will give a good starting point.

Regards

Gull04
Last edited by gull04; 10-15-2018 at 09:44 AM.. Reason: More Information Added
 

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