Block discard on more things
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Now that Fedora 32 has fstrim.timer enabled by default... how about
discards for the things that fstrim doesn't get? Two main things I know
of:
- swap: Do discard at swapon time by setting "discard=once" in
/etc/fstab would be somewhat similar to the periodic fstrim call. I
don't know how much impact the "discard=pages" option might have (the
man page says it is asynchronous, but it might make low-memory
situations worse).
- logical volumes: Set "issue_discards = 1" in /etc/lvm/lvm.conf so that
removed LVs get discarded.
--
Chris Adams <linux(a)cmadams.net>
On Tue, Apr 28, 2020, at 6:51 PM, Chris Adams wrote:
Now that Fedora 32 has fstrim.timer enabled by default... how about
discards for the things that fstrim doesn't get? Two main things I know
of:
- swap: Do discard at swapon time by setting "discard=once" in
/etc/fstab would be somewhat similar to the periodic fstrim call. I
don't know how much impact the "discard=pages" option might have (the
man page says it is asynchronous, but it might make low-memory
situations worse).
Seems reasonable.
- logical volumes: Set "issue_discards = 1" in
/etc/lvm/lvm.conf so that
removed LVs get discarded.
Could foreclose data recovery in case LV was removed entirely, so I'd leave it to
fstrim.timer on the eventual filesystem.
V/r,
James Cassell
Once upon a time, James Cassell <fedoraproject(a)cyberpear.com> said:
On Tue, Apr 28, 2020, at 6:51 PM, Chris Adams wrote:
> Now that Fedora 32 has fstrim.timer enabled by default... how about
> discards for the things that fstrim doesn't get? Two main things I know
> of:
>
> - swap: Do discard at swapon time by setting "discard=once" in
> /etc/fstab would be somewhat similar to the periodic fstrim call. I
> don't know how much impact the "discard=pages" option might have
(the
> man page says it is asynchronous, but it might make low-memory
> situations worse).
Seems reasonable.
I guess this would be a change to anaconda (since it writes /etc/fstab)?
Anybody else have any thoughts on this, should I just go file an RFE bug
against anaconda, ??
> - logical volumes: Set "issue_discards = 1" in
/etc/lvm/lvm.conf so that
> removed LVs get discarded.
Could foreclose data recovery in case LV was removed entirely, so I'd leave it to
fstrim.timer on the eventual filesystem.
That requires that a filesystem is created in the empty space. But I
can also see your point in that discarding immediately may be an issue.
I use a script to create a temporary LV on a PV with free PEs and that
supports discard and then remove it with issue_discards=1... would
something like that be sensible to run along side fstrim.timer?
--
Chris Adams <linux(a)cmadams.net>
On Tuesday, April 28, 2020 3:51:44 PM MST Chris Adams wrote:
Now that Fedora 32 has fstrim.timer enabled by default...
Remember, only in Workstation.
how about discards for the things that fstrim doesn't get? Two
main things
I know of:
- swap: Do discard at swapon time by setting "discard=once" in
/etc/fstab would be somewhat similar to the periodic fstrim call. I
don't know how much impact the "discard=pages" option might have (the
man page says it is asynchronous, but it might make low-memory
situations worse).
- logical volumes: Set "issue_discards = 1" in /etc/lvm/lvm.conf so that
removed LVs get discarded.
Are you asking for these just in Workstation, or are you suggesting that this
is something all of Fedora adopts?
--
John M. Harris, Jr.
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