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On Sun, Aug 14, 2016 at 06:14:12PM -0700, zackp...@gmail.com wrote:
> On Saturday, August 13, 2016 at 5:45:58 PM UTC-4, Marek Marczykowski-Górecki
> wrote:
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> > On Sat, Aug 13, 2016 at 06:53:20AM -0700, zackp...@gmail.com wrote:
> > > On Saturday, August 13, 2016 at 6:14:44 AM UTC-4, Marek
> > > Marczykowski-Górecki wrote:
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> > > > Hash: SHA256
> > > >
> > > > On Sat, Aug 13, 2016 at 03:11:57AM -0700, Andrew David Wong wrote:
> > > > > On 2016-08-12 20:57, zackp...@gmail.com wrote:
> > > > > > Hi all, I'm a new qubes user and have been following the guides to
> > > > > > get
> > > > > > trim enabled for the dom0. Everything seems to have gone smoothly
> > > > > > until the
> > > > > > grub steps. I can't find a grub.cfg file anywhere. The only
> > > > > > abnormality to
> > > > > > my installation is that it's UEFI. So the closest thing I did find
> > > > > > to this
> > > > > > was /boot/efi/EFI/qubes/xen.cfg which had the kernel line
> > > > > > referenced in the
> > > > > > trim guide. However, when I attempt to run grub2-mkconfig -o
> > > > > > /boot/efi/EFI/qubes/xen.cfg I get "grub2-mkconfig: command not
> > > > > > found" All
> > > > > > that is present in the /boot/grub2 folder is a themes folder. I am
> > > > > > using
> > > > > > the main dom0 terminal for all of this.
> > > > > >
> > > > > > Considering that everything boots fine, I'm hesitant to reinstall
> > > > > > grub2 (I
> > > > > > assume it would need to be grub2-efi in this case). Any clue as to
> > > > > > what's
> > > > > > going on? Thanks
> > > > > >
> > > > >
> > > > > I think grub2-mkconfig is not found because you're using UEFI rather
> > > > > than
> > > > > legacy boot. Are you getting your instructions from here?
> > > > >
> > > > > https://www.qubes-os.org/doc/disk-trim/
> > > > >
> > > > > I think these instructions were written with legacy boot in mind. I'm
> > > > > not sure
> > > > > how to enable TRIM on UEFI (CCing Marek).
> > > >
> > > > Yes, on UEFI install /boot/efi/EFI/qubes/xen.cfg is the right file - you
> > > > need to edit it directly.
> > > >
> > > > - --
> > > > Best Regards,
> > > > Marek Marczykowski-Górecki
> > > > Invisible Things Lab
> > > > A: Because it messes up the order in which people normally read text.
> > > > Q: Why is top-posting such a bad thing?
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> > >
> > > So I'm editing the right file, that's all and good. Here's what I've done
> > > so far:
> > >
> > > #Find UUID of ssd
> > > ls /dev/mapper/luks-*
> > > #Set trim in crypttab
> > > sudo nano /etc/crypttab
> > > #Add "allow-discards" at end of entry for ssd with matching UUID
> > > #Set trim in fstab
> > > sudo nano /etc/fstab
> > > #Add "discard" after other flags (like "default") for everything but swap
> > > sudo nano /etc/lvm/lvm.conf
> > > #Change "issue_discards" from "0" to "1"
> > > #Add discard to grub
> > > sudo nano /boot/efi/EFI/qubes/xen.cfg
> > > #At the end of the kernel line, add "rd.luks.allow-discards=1"
> > > #Rebuild initramfs
> > > sudo dracut -H -f
> > > ##Check if discard (trim) is enabled:
> > > lsblk -D
> > > #OR
> > > sudo dmsetup table
> > >
> > > Everything above works except that lsblk still shows no trim support so I
> > > guess that the rebuilding of grub is an important step in this.
> >
> > I think dracut by default place output file in
> > /boot/initramfs-(kernel version), while on UEFI system bootloader loads
> > it from /boot/efi/EFI/qubes/. Try to copy it there.
>
> I checked the date and time of creation of the initramfs file in the
> directories you specified and you are correct in that dracut created it in
> /boot. However, after copying it to /boot/efi/EFI/qubes and replacing the one
> there, there's still no trim support. Here's my output:
>
> sudo dmsetup table
> snapshot-fb01:3278378-fb01:3279033: 0 20971520 snapshot 7:7 7:8 P 256
> qubes_dom0-swap: 0 15990784 linear 251:0 2048
> qubes_dom0-root: 0 451420160 linear 251:0 15992832
> luks-07201718-857d-4108-a722-a5956c443e1e: 0 467421184 crypt aes-xts-plain64
> 00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
> 0 8:19 4096 1 allow_discards
The "allow_discards" is here, so it worked.
> snapshot-fb01:3278350-fb01:3278346: 0 20971520 snapshot 7:0 7:1 P 256
>
> lsblk -D
> NAME DISC-ALN DISC-GRAN DISC-MAX
> DISC-ZERO
> sda 0 512B 2G
> 0
> ├─sda1 0 512B 2G
> 0
> ├─sda2 0 512B 2G
> 0
> ├─sda3 0 512B 2G
> 0
> └─sda4 0 512B 2G
> 0
> sdb 0 512B 2G
> 0
> ├─sdb1 0 512B 2G
> 0
> ├─sdb2 0 512B 2G
> 0
> └─sdb3 0 512B 2G
> 0
> └─luks-07201718-857d-4108-a722-a5956c443e1e
> 0 512B 2G
> 0
> ├─qubes_dom0-root 0 512B 2G
> 0
> └─qubes_dom0-swap 0 512B 2G
> 0
I don't see anything wrong here.
Just to be sure, you can trim empty space:
sudo fstrim -v /
You should get info about trimmed space (and not an error).
- --
Best Regards,
Marek Marczykowski-Górecki
Invisible Things Lab
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?
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