Date: Thu, 21 Apr 2022 20:56:14 +0000 From: Michael Jung <mikej@paymentallianceintl.com> To: Alan Somers <asomers@freebsd.org> Cc: freebsd-fs <freebsd-fs@freebsd.org> Subject: RE: ZFS reservations for type=volume Message-ID: <ac2c7e7344d949d49c5ca56417088d53@MAIL-HUB.pai.local> In-Reply-To: <CAOtMX2jyBH7k1rGZdP3PvHs7j8k=p97XOqJ9GyORaDHxavKtYQ@mail.gmail.com> References: <94c10113c3964b1bbd3f4ddf934c23cd@MAIL-HUB.pai.local> <CAOtMX2jyBH7k1rGZdP3PvHs7j8k=p97XOqJ9GyORaDHxavKtYQ@mail.gmail.com>
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<html><head><style type=3D"text/css">.style1 {font-family: "Times New Roman=
";}</style></head><body>Ok that makes sense... so even though running ZFS s=
ince 9.x I'll ask the newbie question..<BR>
<BR>
If it contributes to the parents "used" value why is not reflecte=
d here in "USED" or in "AVAIL"?<BR>
<BR>
I would expect USED to be my reservation amount of 15.6T + whatever space w=
as<BR>
being used by other things on the pool. "USED" still sits at 1.5=
2T.<BR>
<BR>
NAME TYPE USED AVAIL RATIO COMPRESS RESERV REFRESERV =
VOLSIZE<BR>
raid-5400-1 24.6T 1.52T 23.1T - - 2% 6% 1.00x =
ONLINE<BR>
<BR>
Thanks again.<BR>
<BR>
-----Original Message-----<BR>
From: Alan Somers [mailto:asomers@freebsd.org]<BR>
Sent: Thursday, April 21, 2022 4:40 PM<BR>
To: Michael Jung <mikej@paymentallianceintl.com><BR>
Cc: freebsd-fs <freebsd-fs@freebsd.org><BR>
Subject: Re: ZFS reservations for type=3Dvolume<BR>
<BR>
A dataset's reservation is local. It doesn't contribute to its parent's re=
servation. Otherwise, you wouldn't be able to separately set a reservation=
on the parent. But it _does_ contribute to the parent's "used" =
value. In that way, you're prevented from reserving too much data on the p=
arent's children.<BR>
-Alan<BR>
<BR>
On Thu, Apr 21, 2022 at 2:28 PM Michael Jung <mikej@paymentallianceintl.=
com> wrote:<BR>
><BR>
> I have a zfs block dataset raid-5400-1/esxi-store1 that I share as an<=
BR>
> iscsi target and that works great. I have set a reservation<BR>
><BR>
> on that block device equal to its size so that is not sparse and thus<=
BR>
> while I could over provision guests on the provided LUN,<BR>
><BR>
> the storage presented as the LUN capacity will always be available. A=
t least this is what I want to achieve.<BR>
><BR>
><BR>
><BR>
> What I find strange is that the reservation does not seem to be<BR>
> applied to the ZFS pool =E2=80=98raid-5400-1=E2=80=99. Do you really =
need<BR>
><BR>
> to set your maximum reservation at the pool level, and then apply<BR>
> reservations to all datasets on that volume? And if so<BR>
><BR>
> I would assume you could never set reservations for datasets totaling =
more than what was reserved for the pool =E2=80=98raid-5400-1=E2=80=99.<BR>
><BR>
><BR>
><BR>
> I could build out a test environment and figure out constraints but I=
=E2=80=99d really like to know the =E2=80=9Chow it is supposed to work=E2=
=80=9D<BR>
><BR>
> not the =E2=80=9Chow I find it to work=E2=80=9D.<BR>
><BR>
><BR>
><BR>
> Thanks in advance.<BR>
><BR>
><BR>
><BR>
> FreeBSD 14.0-CURRENT #4 main-n253875-8e72f458c6d:<BR>
><BR>
><BR>
><BR>
> (this is a raidz2 pool =E2=80=93 not my draid pool)<BR>
><BR>
><BR>
><BR>
><BR>
><BR>
> root@draid:/usr/src/contrib/bearssl # zfs list -o<BR>
> name,type,used,avail,ratio,compression,reservation,refreservation,vols=
<BR>
> ize raid-5400-1<BR>
><BR>
> NAME TYPE USED AVAIL RATIO COMPRESS RESERV REFRES=
ERV VOLSIZE<BR>
><BR>
> raid-5400-1 filesystem 18.0T 2.08T 1.36x on none =
none - <- no reservation @pool<BR>
><BR>
> root@draid:/usr/src/contrib/bearssl #<BR>
><BR>
><BR>
><BR>
> root@draid:/usr/src/contrib/bearssl # zfs list -o<BR>
> name,type,used,avail,ratio,compression,reservation,refreservation,vols=
<BR>
> ize raid-5400-1/esxi-store1<BR>
><BR>
> NAME TYPE USED AVAIL RATIO COMPRESS RE=
SERV REFRESERV VOLSIZE<BR>
><BR>
> raid-5400-1/esxi-store1 volume 16.9T 18.5T 1.78x zstd =
15.6T 16.9T 15.6T <- reservation @dataset<BR>
><BR>
><BR>
><BR>
> root@draid:/usr/src/contrib/bearssl # zpool list<BR>
><BR>
> NAME SIZE ALLOC FREE CKPOINT EXPANDSZ FRAG CAP DED=
UP HEALTH ALTROOT<BR>
><BR>
> ccache 9.50G 9.10G 406M - - 88% 95% 1.0=
0x ONLINE -<BR>
><BR>
> raid-5400-1 24.6T 1.52T 23.1T - - 2% 6% 1.0=
0x ONLINE - <- Free does not reflect reservation=
@pool<BR>
><BR>
> tank 18.5T 605G 17.9T - - 0% 3% 1.0=
0x ONLINE -<BR>
><BR>
> zfsroot 103G 33.3G 69.7G - - 31% 32% 1.0=
0x ONLINE -<BR>
><BR>
> root@draid:/usr/src/contrib/bearssl #<BR>
><BR>
><BR>
><BR>
><BR>
><BR>
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