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Improve disk used heuristics. Disk preallocation is disabled by default (again)

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Martin Wimpress 2021-10-07 15:56:06 +01:00
parent fcc050ed82
commit 7553e77b11
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GPG key ID: 61DF940515E06DA3
2 changed files with 23 additions and 14 deletions
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5
README.md
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@ -314,10 +314,9 @@ Add additional lines to your virtual machine configuration:
## Disk preallocation ## Disk preallocation
Preallocation mode (allowed values: `off`, `metadata` (default), `falloc`, `full`). Preallocation mode (allowed values: `off` (default), `metadata`, `falloc`, `full`).
An image with preallocated metadata is initially larger but can improve performance An image with preallocated metadata is initially larger but can improve performance
when the image needs to grow. `falloc` and `full` preallocations are like the when the image needs to grow.
same options of raw format, but sets up metadata also.
Specify what disk preallocation should be used, if any, when creating the system Specify what disk preallocation should be used, if any, when creating the system
disk image by adding a line like this to your VM configuration. disk image by adding a line like this to your VM configuration.

20
quickemu
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@ -142,6 +142,7 @@ function check_cpu_flag() {
function vm_boot() { function vm_boot() {
local BALLOON="-device virtio-balloon" local BALLOON="-device virtio-balloon"
local CPU="" local CPU=""
local DISK_USED=""
local GUEST_CPU_CORES="" local GUEST_CPU_CORES=""
local GUEST_CPU_LOGICAL_CORES="" local GUEST_CPU_LOGICAL_CORES=""
local GUEST_CPU_THREADS="" local GUEST_CPU_THREADS=""
@ -384,12 +385,15 @@ function vm_boot() {
exit 1 exit 1
fi fi
echo " Just created, booting from ${iso}${img}" echo " Just created, booting from ${iso}${img}"
DISK_USED="no"
elif [ -e "${disk_img}" ]; then elif [ -e "${disk_img}" ]; then
# Check there isn't already a process attached to the disk image. # Check there isn't already a process attached to the disk image.
if ! ${QEMU_IMG} info "${disk_img}" >/dev/null; then if ! ${QEMU_IMG} info "${disk_img}" >/dev/null; then
echo " Failed to get \"write\" lock. Is another process using the disk?" echo " Failed to get \"write\" lock. Is another process using the disk?"
exit 1 exit 1
else else
# Only check disk image size if preallocation is off
if [ "${preallocation}" == "off" ]; then
DISK_CURR_SIZE=$(stat -c%s "${disk_img}") DISK_CURR_SIZE=$(stat -c%s "${disk_img}")
if [ "${DISK_CURR_SIZE}" -le "${DISK_MIN_SIZE}" ]; then if [ "${DISK_CURR_SIZE}" -le "${DISK_MIN_SIZE}" ]; then
echo " Looks unused, booting from ${iso}${img}" echo " Looks unused, booting from ${iso}${img}"
@ -398,13 +402,19 @@ function vm_boot() {
exit 1 exit 1
fi fi
else else
# If there is a disk image, assume there is an install and do not boot DISK_USED="yes"
# from installation media. fi
else
DISK_USED="yes"
fi
fi
fi
if [ "${DISK_USED}" == "yes" ]; then
# If there is a disk image that appears to be used do not boot from installation media.
iso="" iso=""
img="" img=""
fi fi
fi
fi
# Has the status quo been requested? # Has the status quo been requested?
if [ "${STATUS_QUO}" == "-snapshot" ]; then if [ "${STATUS_QUO}" == "-snapshot" ]; then
@ -776,7 +786,7 @@ img=""
iso="" iso=""
macos_release="" macos_release=""
port_forwards=() port_forwards=()
preallocation="metadata" preallocation="off"
ram="" ram=""
tpm="off" tpm="off"
usb_devices=() usb_devices=()