Date: Thu, 21 Apr 2022 15:45:25 -0600 From: Alan Somers <asomers@freebsd.org> To: Michael Jung <mikej@paymentallianceintl.com> Cc: freebsd-fs <freebsd-fs@freebsd.org> Subject: Re: ZFS reservations for type=volume Message-ID: <CAOtMX2hvzCEFkx0CPzxc9U9Pgtpdjpk4X_zpVMc9PgC5dg03Gg@mail.gmail.com> In-Reply-To: <ac2c7e7344d949d49c5ca56417088d53@MAIL-HUB.pai.local> References: <94c10113c3964b1bbd3f4ddf934c23cd@MAIL-HUB.pai.local> <CAOtMX2jyBH7k1rGZdP3PvHs7j8k=p97XOqJ9GyORaDHxavKtYQ@mail.gmail.com> <ac2c7e7344d949d49c5ca56417088d53@MAIL-HUB.pai.local>
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Isn't 1.52T the "AVAIL" value, and 24.6T is the "USED"? On Thu, Apr 21, 2022 at 2:56 PM Michael Jung <mikej@paymentallianceintl.com> wrote: > > Ok that makes sense... so even though running ZFS since 9.x I'll ask the = newbie question.. > > If it contributes to the parents "used" value why is not reflected here i= n "USED" or in "AVAIL"? > > I would expect USED to be my reservation amount of 15.6T + whatever space= was > being used by other things on the pool. "USED" still sits at 1.52T. > > NAME TYPE USED AVAIL RATIO COMPRESS RESERV REFRESERV VOLSIZE > raid-5400-1 24.6T 1.52T 23.1T - - 2% 6% 1.00x ONLINE > > Thanks again. > > -----Original Message----- > From: Alan Somers [mailto:asomers@freebsd.org] > Sent: Thursday, April 21, 2022 4:40 PM > To: Michael Jung <mikej@paymentallianceintl.com> > Cc: freebsd-fs <freebsd-fs@freebsd.org> > Subject: Re: ZFS reservations for type=3Dvolume > > A dataset's reservation is local. It doesn't contribute to its parent's r= eservation. 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 t= hat way, you're prevented from reserving too much data on the parent's chil= dren. > -Alan > > On Thu, Apr 21, 2022 at 2:28 PM Michael Jung <mikej@paymentallianceintl.c= om> wrote: > > > > I have a zfs block dataset raid-5400-1/esxi-store1 that I share as an > > iscsi target and that works great. I have set a reservation > > > > on that block device equal to its size so that is not sparse and thus > > while I could over provision guests on the provided LUN, > > > > the storage presented as the LUN capacity will always be available. At = least this is what I want to achieve. > > > > > > > > What I find strange is that the reservation does not seem to be > > applied to the ZFS pool =E2=80=98raid-5400-1=E2=80=99. Do you really ne= ed > > > > to set your maximum reservation at the pool level, and then apply > > reservations to all datasets on that volume? And if so > > > > I would assume you could never set reservations for datasets totaling m= ore than what was reserved for the pool =E2=80=98raid-5400-1=E2=80=99. > > > > > > > > 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 > > > > not the =E2=80=9Chow I find it to work=E2=80=9D. > > > > > > > > Thanks in advance. > > > > > > > > FreeBSD 14.0-CURRENT #4 main-n253875-8e72f458c6d: > > > > > > > > (this is a raidz2 pool =E2=80=93 not my draid pool) > > > > > > > > > > > > root@draid:/usr/src/contrib/bearssl # zfs list -o > > name,type,used,avail,ratio,compression,reservation,refreservation,vols > > ize raid-5400-1 > > > > NAME TYPE USED AVAIL RATIO COMPRESS RESERV REFRESERV VOLSIZE > > > > raid-5400-1 filesystem 18.0T 2.08T 1.36x on none none - <- no reservati= on @pool > > > > root@draid:/usr/src/contrib/bearssl # > > > > > > > > root@draid:/usr/src/contrib/bearssl # zfs list -o > > name,type,used,avail,ratio,compression,reservation,refreservation,vols > > ize raid-5400-1/esxi-store1 > > > > NAME TYPE USED AVAIL RATIO COMPRESS RESERV REFRESERV VOLSIZE > > > > raid-5400-1/esxi-store1 volume 16.9T 18.5T 1.78x zstd 15.6T 16.9T 15.6T= <- reservation @dataset > > > > > > > > root@draid:/usr/src/contrib/bearssl # zpool list > > > > NAME SIZE ALLOC FREE CKPOINT EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT > > > > ccache 9.50G 9.10G 406M - - 88% 95% 1.00x ONLINE - > > > > raid-5400-1 24.6T 1.52T 23.1T - - 2% 6% 1.00x ONLINE - <- Free does not= reflect reservation @pool > > > > tank 18.5T 605G 17.9T - - 0% 3% 1.00x ONLINE - > > > > zfsroot 103G 33.3G 69.7G - - 31% 32% 1.00x ONLINE - > > > > root@draid:/usr/src/contrib/bearssl # > > > > > > > > > > > > CONFIDENTIALITY NOTE: This message is intended only for the use of the > > individual or entity to whom it is addressed and may contain > > information that is privileged, confidential, and exempt from > > disclosure under applicable law. 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