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Diffstat (limited to 'qemu-options.hx')
| -rw-r--r-- | qemu-options.hx | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/qemu-options.hx b/qemu-options.hx index b37eb9662b..b57489d7ca 100644 --- a/qemu-options.hx +++ b/qemu-options.hx @@ -1431,6 +1431,18 @@ SRST issued on other occasions where a cluster gets freed (on/off; default: off) + ``discard-no-unref`` + When enabled, discards from the guest will not cause cluster + allocations to be relinquished. This prevents qcow2 fragmentation + that would be caused by such discards. Besides potential + performance degradation, such fragmentation can lead to increased + allocation of clusters past the end of the image file, + resulting in image files whose file length can grow much larger + than their guest disk size would suggest. + If image file length is of concern (e.g. when storing qcow2 + images directly on block devices), you should consider enabling + this option. + ``overlap-check`` Which overlap checks to perform for writes to the image (none/constant/cached/all; default: cached). For details or |