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-rwxr-xr-xtests/basic/tier/tier.t2
1 files changed, 1 insertions, 1 deletions
diff --git a/tests/basic/tier/tier.t b/tests/basic/tier/tier.t
index d1e1041f87c..6097ad6e7d6 100755
--- a/tests/basic/tier/tier.t
+++ b/tests/basic/tier/tier.t
@@ -102,7 +102,7 @@ sleep 12
uuidgen >> d1/data2.txt
# Check promotion on read to slow tier
-echo 3 > /proc/sys/vm/drop_caches
+( cd $M0 ; umount $M0 ) # fail but drops kernel cache
cat d1/data3.txt
sleep 5
EXPECT_WITHIN $PROMOTE_TIMEOUT "0" file_on_fast_tier d1/data2.txt