On May 9, 2:54 pm, Dave <f...@coo.com> wrote:
> usenetpersonger...@gmail.com wrote:
> > On May 9, 2:23 pm, Dave <f...@coo.com> wrote:

> >> Anyway, forgetting the speed issues for the moment, I attached a pair of
> >> Western Digitial "My Book Essential Edition" 1 TB external USB disks.
> >> The disks were both bought from Amazon within a week of each other, and
> >> for all intents are purposes look the same.
> > Look
> >> I can create a ZFS pool for each disk individually, and they are the
> >> same size (as expected), since the disks are as far as I am aware identical.
> >> # zpool create tmp1 c6t0d0
> >> # zpool create tmp2 c7t0d0
> >> # zpool list
> >> NAME SIZE USED AVAIL CAP HEALTH ALTROOT
> >> tmp1 928G 88K 928G 0% ONLINE -
> >> tmp2 928G 88K 928G 0% ONLINE -
> >> df shows two file systems of the same size.
> >> Filesystem kbytes used avail capacity Mounted on
> >> <snip>
> >> tmp1 957874176 24 957874091 1% /tmp1
> >> tmp2 957874176 24 957874091 1% /tmp2
> >> Now I destroy the pools.
> >> # zpool destroy -f tmp1
> >> # zpool destroy -f tmp2
> >> Finally I try to mirror them.
> >> # zpool create TBmirror mirror c6t0d0 c7t0d0
> >> invalid vdev specification
> >> use '-f' to override the following errors:
> >> mirror contains devices of different sizes
> >> Now I can create the mirror if I use the -f option
> >> # zpool create -f TBmirror mirror c6t0d0 c7t0d0
> >> # zpool list
> >> NAME SIZE USED AVAIL CAP HEALTH ALTROOT
> >> TBmirror 928G 89K 928G 0% ONLINE -
> >> Again, using df I see the mirror is the exact same size as the
> >> individual disks were.
> >> # df -k
> >> Filesystem kbytes used avail capacity Mounted on
> >> /dev/dsk/c1t1d0s0 20168929 15875917 4091323 80% /
> >> <snip>
> >> TBmirror 957874176 24 957874090 1% /TBmirror
> >> Any ideas why a warning/error is generated by zpool for two apparently
> >> identical external USB disks?
> > prtvtoc might reveal they ARENT identical...?
>
> Since posting I have made some changes to allow USB 2.0 to work. The
> result of that is the device files have changed. But prtconf on the new
> device files shows the disks the same
>
> # prtvtoc /dev/rdsk/c8t0d0

> 0 4 00 34 1953508717 1953508750
> 8 11 00 1953508751 16384 1953525134
> # prtvtoc /dev/rdsk/c5t0d0

> 0 4 00 34 1953508717 1953508750
> 8 11 00 1953508751 16384 1953525134

They WERE of different sizes...? : >
They appear to be OK now. I doubt the labels were identical is all.