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fix #3329: turn on cache=writeback for efidisks on rbd

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on slower ceph clusters, the write pattern of the ovmf booting process
slows down the boot of the vm, so we turn on caching by default

it seems no other storage (until now) behaves like this. if it does in
the future, we can still add them too, or add a 'cache' property for
the efidisk

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
This commit is contained in:
Dominik Csapak 2021-06-16 15:09:33 +02:00 committed by Thomas Lamprecht
parent 16e66777a0
commit 6aaad2306d
1 changed files with 9 additions and 1 deletions
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10
PVE/QemuServer.pm
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@ -3307,8 +3307,16 @@ sub config_to_command {
$size_str = ",size=" . (-s $ovmf_vars);
}
# on slower ceph clusters, booting without cache on efidisk can take a while.
# enable cache by default, should not be harmful since it's only the efidisk
# see #3329
my $cache = "";
if ($path =~ m/^rbd:/) {
$cache = ',cache=writeback';
}
push @$cmd, '-drive', "if=pflash,unit=0,format=raw,readonly=on,file=$ovmf_code";
push @$cmd, '-drive', "if=pflash,unit=1,format=$format,id=drive-efidisk0$size_str,file=$path";
push @$cmd, '-drive', "if=pflash,unit=1$cache,format=$format,id=drive-efidisk0$size_str,file=$path";
}
# load q35 config