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storage: document preallocation as a common storage option

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Signed-off-by: Fabian Ebner <f.ebner@proxmox.com>
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Fabian Ebner 2022-02-07 09:06:47 +01:00 committed by Thomas Lamprecht
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@ -239,6 +239,12 @@ format::
Default image format (`raw|qcow2|vmdk`)
preallocation::
Preallocation mode (`off|metadata|falloc|full`) for `raw` and `qcow2` images on
file-based storages. The default is `metadata`, which is treated like `off` for
`raw` images. When using network storages in combination with large `qcow2`
images, using `off` can help to avoid timeouts.
WARNING: It is not advisable to use the same storage pool on different
{pve} clusters. Some storage operation need exclusive access to the