Re: [gentoo-user] Persistence of ZFS /dev/zvol/rpool/swap
On December 14, 2018 10:59:08 AM UTC, Pariksheet Nanda wrote: >Hi Joost, > >On Fri, Dec 14, 2018 at 12:16 AM J. Roeleveld >wrote: >> >> >> Hibernation may work when building your own initramfs. >> Not sure if dracut and the likes have support for it themselves. >> >> Joost > >Yeah, I know it's possible to hibernate using my same setup using >BTRFS instead of ZFS. But after a few weeks of use BTRFS eventually >becomes slow as molasses; processes routinely get stuck in deep disk >sleep. In both cases I've been using genkernel for my initramfs. >Thanks for the encouragement to dig into the initramfs setup. I'll >report back if I have any success or questions. > >Pariksheet On my laptop I have full disk encryption using dmcrypt. LVM on top of that and my swap inside an LV. My initramfs does the following: - decrypts the disk using a typed in password - enables LVM - passes the swap partition to kernel resume - if resume doesn't start, it will mount the partitions and initiates proper boot Passing the swap partition requires identifying some codes that can differ every boot. I can post my script if you think it will help? -- Joost -- Sent from my Android device with K-9 Mail. Please excuse my brevity.
Re: [gentoo-user] Persistence of ZFS /dev/zvol/rpool/swap
Hi Joost, On Fri, Dec 14, 2018 at 12:16 AM J. Roeleveld wrote: > > > Hibernation may work when building your own initramfs. > Not sure if dracut and the likes have support for it themselves. > > Joost Yeah, I know it's possible to hibernate using my same setup using BTRFS instead of ZFS. But after a few weeks of use BTRFS eventually becomes slow as molasses; processes routinely get stuck in deep disk sleep. In both cases I've been using genkernel for my initramfs. Thanks for the encouragement to dig into the initramfs setup. I'll report back if I have any success or questions. Pariksheet
Re: [gentoo-user] Persistence of ZFS /dev/zvol/rpool/swap
On December 14, 2018 3:19:33 AM UTC, Pariksheet Nanda wrote: >Thanks, Roger and Joost! > >The problem was my failed attempt at hibernation. I'm using >cryptsetup for full disk encryption and there's a limitation of not >being able to hibernate without creating a separate partition - which >I don't intend to do. >I see /dev/zvol/rpool/swap is available now after commenting out >SLEEP_MODULE="kernel" in /etc/pm/config.d/gentoo and removing >resume=/dev/zvol/rpool/swap from GRUB_CMDLINE_LINUX in >/etc/default/grub and updating grub.cfg > > >On Mon, Nov 26, 2018 at 1:04 AM Roger J. H. Welsh >wrote: >> >> If it exists on `zfs list`, your swap partition is in there >somewhere. >> >> Roger Welsh > >Yes, it would always show as existing with `zfs list` even when it did >not appear in /dev > > >On Sun, Nov 25, 2018 at 11:00 PM J. Roeleveld >wrote: >> >> Did you enable all ZFS services into the correct runlevels? >> >> Joost > >Yes: > >$ rc-status -a | grep -e zfs -e '^[^ ]' >Runlevel: sysinit >Runlevel: boot >zfs-import[ >started ] >zfs-mount [ >started ] >Runlevel: default >zfs-zed [ >started ] >zfs-share [ >started ] >--snip-- > > >Thanks again! <3 >Pariksheet Hibernation may work when building your own initramfs. Not sure if dracut and the likes have support for it themselves. -- Joost -- Sent from my Android device with K-9 Mail. Please excuse my brevity.
Re: [gentoo-user] Persistence of ZFS /dev/zvol/rpool/swap
Thanks, Roger and Joost! The problem was my failed attempt at hibernation. I'm using cryptsetup for full disk encryption and there's a limitation of not being able to hibernate without creating a separate partition - which I don't intend to do. I see /dev/zvol/rpool/swap is available now after commenting out SLEEP_MODULE="kernel" in /etc/pm/config.d/gentoo and removing resume=/dev/zvol/rpool/swap from GRUB_CMDLINE_LINUX in /etc/default/grub and updating grub.cfg On Mon, Nov 26, 2018 at 1:04 AM Roger J. H. Welsh wrote: > > If it exists on `zfs list`, your swap partition is in there somewhere. > > Roger Welsh Yes, it would always show as existing with `zfs list` even when it did not appear in /dev On Sun, Nov 25, 2018 at 11:00 PM J. Roeleveld wrote: > > Did you enable all ZFS services into the correct runlevels? > > Joost Yes: $ rc-status -a | grep -e zfs -e '^[^ ]' Runlevel: sysinit Runlevel: boot zfs-import[ started ] zfs-mount [ started ] Runlevel: default zfs-zed [ started ] zfs-share [ started ] --snip-- Thanks again! <3 Pariksheet
Re: [gentoo-user] Persistence of ZFS /dev/zvol/rpool/swap
Hi, I followed fearedbliss's guide a couple years back. Here are my 2 cents. On Sun, Nov 25, 2018 at 04:36:35PM -0500 , Pariksheet Nanda wrote: > I'm actually surprised my system boots at all, because /etc/fstab looks for > that partition to be the swap: I don't think swap is required for booting. > My best guesses at the problem are either that it's udev related or that > the various ZFS services need to be better configured to expose the zvol. > I read the "Admin Documentation" links on the zfsonlinux.org website > looking for mentions on "zvol" and the only relevant section seems to be > the `zpool import` should apply `zfs share -a` to zvols [2]. Maybe I need > to run `zfs share`? But that doesn't seem to help: > It does seem to be a udev issue on your end. This is what your udev rule should look like. https://github.com/zfsonlinux/zfs/blob/master/udev/rules.d/60-zvol.rules.in Check it exists. # cat /lib/udev/rules.d/60-zvol.rules Reload udev rules. # rc-service udev reload I think you also have to re-trigger the rules, which is beyond the scope of my knowledge. # man udevadm If it exists on `zfs list`, your swap partition is in there somewhere. This command will show you any swap partitions in use. # swapon --show Good luck! -- Roger Welsh fpr: 2FCB 9E31 EA77 CDEC A3AE 5DD7 D54C C777 553A 180D
Re: [gentoo-user] Persistence of ZFS /dev/zvol/rpool/swap
I followed the same guide and don't have this issue. Did you enable all ZFS services into the correct runlevels? -- Joost On November 25, 2018 9:36:35 PM UTC, Pariksheet Nanda wrote: >Hi folks, > >I've followed fearedbliss' guide for installing Gentoo on ZFS [1] and >am >trying to understand why /dev/zol/rpool/swap does not show up on reboot >even though I saw it initially when creating the zvol and can still see >it >with zfs list: > >xm2 ~ # zfs list >NAMEUSED AVAIL REFER MOUNTPOINT >rpool 29.1G 176G96K none >rpool/HOME 4.98G 176G 4.98G /home >rpool/ROOT 7.10G 176G96K none >rpool/ROOT/gentoo 7.10G 176G 7.10G / >rpool/swap 17.0G 193G 354M - >xm2 ~ # ls /dev/zvol >ls: cannot access '/dev/zvol': No such file or directory >xm2 ~ # > >I'm actually surprised my system boots at all, because /etc/fstab looks >for >that partition to be the swap: > >xm2 ~ # grep ^/dev /etc/fstab >/dev/zvol/rpool/swapnoneswapsw,discard0 0 >xm2 ~ # > >My best guesses at the problem are either that it's udev related or >that >the various ZFS services need to be better configured to expose the >zvol. >I read the "Admin Documentation" links on the zfsonlinux.org website >looking for mentions on "zvol" and the only relevant section seems to >be >the `zpool import` should apply `zfs share -a` to zvols [2]. Maybe I >need >to run `zfs share`? But that doesn't seem to help: > >xm2 ~ # zfs share rpool/swap >cannot open 'rpool/swap': operation not applicable to datasets of this >type >xm2 ~ # zfs share -a >xm2 ~ # ls /dev/zvol >ls: cannot access '/dev/zvol': No such file or directory >xm2 ~ # > >I haven't posted on this list in many years, so go easy on me :) > >Pariksheet > >[1] >https://wiki.gentoo.org/wiki/User:Fearedbliss/Installing_Gentoo_Linux_On_ZFS#Create_your_swap_zvol >[2] http://open-zfs.org/wiki/System_Administration#Boot_process -- Sent from my Android device with K-9 Mail. Please excuse my brevity.
[gentoo-user] Persistence of ZFS /dev/zvol/rpool/swap
Hi folks, I've followed fearedbliss' guide for installing Gentoo on ZFS [1] and am trying to understand why /dev/zol/rpool/swap does not show up on reboot even though I saw it initially when creating the zvol and can still see it with zfs list: xm2 ~ # zfs list NAMEUSED AVAIL REFER MOUNTPOINT rpool 29.1G 176G96K none rpool/HOME 4.98G 176G 4.98G /home rpool/ROOT 7.10G 176G96K none rpool/ROOT/gentoo 7.10G 176G 7.10G / rpool/swap 17.0G 193G 354M - xm2 ~ # ls /dev/zvol ls: cannot access '/dev/zvol': No such file or directory xm2 ~ # I'm actually surprised my system boots at all, because /etc/fstab looks for that partition to be the swap: xm2 ~ # grep ^/dev /etc/fstab /dev/zvol/rpool/swapnoneswapsw,discard0 0 xm2 ~ # My best guesses at the problem are either that it's udev related or that the various ZFS services need to be better configured to expose the zvol. I read the "Admin Documentation" links on the zfsonlinux.org website looking for mentions on "zvol" and the only relevant section seems to be the `zpool import` should apply `zfs share -a` to zvols [2]. Maybe I need to run `zfs share`? But that doesn't seem to help: xm2 ~ # zfs share rpool/swap cannot open 'rpool/swap': operation not applicable to datasets of this type xm2 ~ # zfs share -a xm2 ~ # ls /dev/zvol ls: cannot access '/dev/zvol': No such file or directory xm2 ~ # I haven't posted on this list in many years, so go easy on me :) Pariksheet [1] https://wiki.gentoo.org/wiki/User:Fearedbliss/Installing_Gentoo_Linux_On_ZFS#Create_your_swap_zvol [2] http://open-zfs.org/wiki/System_Administration#Boot_process
