zfs newbie (fwd)

Doug Denault doug at safeport.com
Tue Sep 14 22:50:19 UTC 2021

crud -sent from wrong user again; there may be 2 of these
---------- Forwarded message ----------
Date: Tue, 14 Sep 2021 18:42:26 -0400 (EDT)
From: DTD <support at safeport.com>
To: Dan Langille <dan at langille.org>
Cc: freebsd-questions at FreeBSD.ORG
Subject: Re: zfs newbie

On Tue, 14 Sep 2021, Dan Langille wrote:

> DTD wrote on 9/7/21 5:51 PM:
>> Following the default 12.2 zfs install I got one pool (zroot) and a dataset 
>> for each of the traditional mount points. So zfs list shows:
>> zroot                279G  6.75T    88K  /zroot
>> zroot/ROOT          1.74G  6.75T    88K  none
>> zroot/ROOT/default  1.74G  6.75T  1.74G  /
>> zroot/tmp            176K  6.75T   176K  /tmp
>> zroot/usr            277G  6.75T    88K  /usr
>> zroot/usr/home       276G  6.75T   276G  /usr/home
>> zroot/usr/ports       88K  6.75T    88K  /usr/ports
>> zroot/usr/src        670M  6.75T   670M  /usr/src
>> zroot/var           47.5M  6.75T    88K  /var
>> zroot/var/audit       88K  6.75T    88K  /var/audit
>> zroot/var/crash       88K  6.75T    88K  /var/crash
>> zroot/var/log        820K  6.75T   820K  /var/log
>> zroot/var/mail      46.3M  6.75T  46.3M  /var/mail
>> zroot/var/tmp         88K  6.75T    88K  /var/tmp
>> I had consultant configure another service for us. He set up the disk array 
>> with one dataset. so zfs list on this system give:
>> zroot  2.65G  13.2T  2.62G  legacy
>> From a sysadmin view I rather like the multiple datasets. Are there 
>> advantages to one over the other?
> I see no advantages to me in the single dataset.
> What do you see from zpool status? I'm wondering if this is not directly on 
> hardware, such as a VM under VMware.
Nop, no VM. I have three system that I did a take all options zfs install on. I 
do not remember which one I posted so here is a matching set:

> freebsd-version

> zfs list
zroot               90.6G   801G    88K  /zroot
zroot/ROOT          89.9G   801G    88K  none
zroot/ROOT/default  89.9G   801G  89.9G  /
zroot/tmp            156K   801G   156K  /tmp
zroot/usr            723M   801G    88K  /usr
zroot/usr/home      18.7M   801G  18.7M  /usr/home
zroot/usr/ports       88K   801G    88K  /usr/ports
zroot/usr/src        704M   801G   704M  /usr/src
zroot/var           21.7M   801G    88K  /var
zroot/var/audit       88K   801G    88K  /var/audit
zroot/var/crash       88K   801G    88K  /var/crash
zroot/var/log       21.3M   801G  21.3M  /var/log
zroot/var/mail        88K   801G    88K  /var/mail
zroot/var/tmp         88K   801G    88K  /var/tmp

> zpool status
   pool: zroot
  state: ONLINE
   scan: none requested

         NAME        STATE     READ WRITE CKSUM
         zroot       ONLINE       0     0     0
           mirror-0  ONLINE       0     0     0
             ada0p3  ONLINE       0     0     0
             ada1p3  ONLINE       0     0     0

errors: No known data errors

Douglas Denault
support at safeport.com
Voice: 301-217-9220
   Fax: 301-217-9277

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