test: pvmove segmentationzkabelac-pvmove-segmentation

1 files changed, 106 insertions, 0 deletions

diff --git a/test/shell/pvmove-segment-size-limit.sh b/test/shell/pvmove-segment-size-limit.sh
new file mode 100644
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+++ b/test/shell/pvmove-segment-size-limit.sh
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+#!/usr/bin/env bash
+
+# Copyright (C) 2025 Red Hat, Inc. All rights reserved.
+#
+# This copyrighted material is made available to anyone wishing to use,
+# modify, copy, or redistribute it subject to the terms and conditions
+# of the GNU General Public License v.2.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software Foundation,
+# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+
+test_description="test pvmove with pvmove_max_segment_size_mb limit"
+
+. lib/inittest
+
+# Test pvmove segment chunking with small sizes to avoid copying too much data
+# We use 4MiB max segment size and 32MiB total volume size
+
+aux prepare_pvs 4
+
+get_devs
+
+# Create VG with 4MiB extent size
+vgcreate -s 4M "$vg" "${DEVICES[@]}"
+
+# Create a 36MiB striped LV on dev1+2+3
+# With 4MiB extent size, this is 3*9 extents
+lvcreate -aey -L 36M -i3 -n "$lv" "$vg"
+
+# Verify LV is on dev1+2+3
+check lv_on "$vg" "$lv" "$dev1" "$dev2" "$dev3"
+
+# Show initial segment layout
+lvs -a -o name,size,seg_pe_ranges "$vg"
+
+# Configure pvmove_max_segment_size to 4MiB
+# This should split the 36MiB LV into 3 chunks of 12MiB (3 extent) each
+aux lvmconf "allocation/pvmove_max_segment_size_mb = 4"
+
+# Run pvmove with verbose logging to see the splitting
+pvmove -i0 -vvv "$dev1" "$dev4" 2>&1 | tee pvmove.log
+
+# Check that the splitting occurred
+# We expect to see "Splitting" messages in the log
+grep -q "Splitting" pvmove.log || die "Expected to see segment splitting in pvmove log"
+
+# Count how many split operations occurred
+# With 36MiB LV and 4MiB->12MiB limit, we expect 3 splits (to create 3 segments)
+split_count=$(grep -c "Split segment.* at LE" pvmove.log || true)
+echo "Number of splits: $split_count"
+
+lvs -ao+seg_size,seg_pe_ranges $vg
+
+# We should see 2 splits as from 4MiB we get 12MiB as stripe aligned chunks
+test "$split_count" -eq 2 || die "Expected 2 splits, got $split_count"
+
+# Verify that the max segment size message appears
+grep -q "Pvmove max segment size.*4.* extent" pvmove.log || \
+ die "Expected to see max segment size configuration in log"
+
+# Verify LV is now on dev2+3+4
+check lv_on "$vg" "$lv" "$dev2" "$dev3" "$dev4"
+
+# Verify no pvmove LVs remain
+get lv_field "$vg" name -a > out
+not grep "^\[pvmove" out || die "pvmove LV still exists"
+
+# Verify data integrity (LV should still be accessible)
+lvchange -ay "$vg/$lv"
+check lv_field "$vg/$lv" lv_active "active"
+
+# Test with larger limit (no splitting expected)
+
+# Configure with 64MiB limit (larger than our LV)
+aux lvmconf "allocation/pvmove_max_segment_size_mb = 64"
+
+# Run pvmove again
+pvmove -i0 -vvv "$dev4" "$dev1" 2>&1 | tee pvmove-nosplit.log
+
+# This time we should NOT see splitting
+grep -q "within limit" pvmove-nosplit.log || \
+ die "Expected to see 'within limit' message with large segment size"
+
+# Should see zero splits
+split_count_nosplit=$(grep -c "Split segment.* at LE" pvmove-nosplit.log || true)
+echo "Number of splits with large limit: $split_count_nosplit"
+test "$split_count_nosplit" -eq 0 || \
+ die "Expected 0 splits with large limit, got $split_count_nosplit"
+
+# Verify LV is on dev1+2+3
+check lv_on "$vg" "$lv" "$dev1" "$dev2" "$dev3"
+
+# Test with limit disabled (0 = unlimited)
+aux lvmconf "allocation/pvmove_max_segment_size_mb = 0"
+
+pvmove -i0 -vvv "$dev1" "$dev4" 2>&1 | tee pvmove-unlimited.log
+
+# Should not see any splitting messages
+not grep -q "Splitting" pvmove-unlimited.log
+
+# Verify final state dev2+3+4
+check lv_on "$vg" "$lv" "$dev2" "$dev3" "$dev4"
+
+# Cleanup
+vgremove -ff "$vg"