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-rw-r--r--sparsify/virt-sparsify.pod8
1 files changed, 8 insertions, 0 deletions
diff --git a/sparsify/virt-sparsify.pod b/sparsify/virt-sparsify.pod
index 275faf5a..14f7eecb 100644
--- a/sparsify/virt-sparsify.pod
+++ b/sparsify/virt-sparsify.pod
@@ -271,6 +271,14 @@ to point to another directory that has enough space.
This defaults to C</tmp>.
+Note that if C<$TMPDIR> is a tmpfs (eg. if C</tmp> is on tmpfs, or if
+you use C<TMPDIR=/dev/shm>), tmpfs defaults to a maximum size of
+I<half> of physical RAM. If virt-sparsify exceeds this, it will hang.
+The solution is either to use a real disk, or to increase the maximum
+size of the tmpfs mountpoint, eg:
+
+ mount -o remount,size=10G /tmp
+
=back
For other environment variables, see L<guestfs(3)/ENVIRONMENT VARIABLES>.