#!/bin/ksh -p # # CDDL HEADER START # # This file and its contents are supplied under the terms of the # Common Development and Distribution License ("CDDL"), version 1.0. # You may only use this file in accordance with the terms of version # 1.0 of the CDDL. # # A full copy of the text of the CDDL should have accompanied this # source. A copy of the CDDL is also available via the Internet at # http://www.illumos.org/license/CDDL. # # CDDL HEADER END # # # Copyright (c) 2017 by Lawrence Livermore National Security, LLC. # # DESCRIPTION: # Verify MMP writes are distributed evenly among leaves # # STRATEGY: # 1. Create an asymmetric mirrored pool # 2. Enable multihost and multihost_history # 3. Delay for MMP writes to occur # 4. Verify the MMP writes are distributed evenly across leaf vdevs # . $STF_SUITE/include/libtest.shlib . $STF_SUITE/tests/functional/mmp/mmp.cfg . $STF_SUITE/tests/functional/mmp/mmp.kshlib verify_runnable "both" function cleanup { log_must zpool destroy $MMP_POOL log_must rm $MMP_DIR/file.{0,1,2,3,4,5,6,7} log_must rm $MMP_HISTORY_TMP log_must rmdir $MMP_DIR log_must mmp_clear_hostid } log_assert "mmp writes are evenly distributed across leaf vdevs" log_onexit cleanup MMP_HISTORY_TMP=$MMP_DIR/history MMP_HISTORY=/proc/spl/kstat/zfs/$MMP_POOL/multihost # Step 1 log_must mkdir -p $MMP_DIR log_must truncate -s 128M $MMP_DIR/file.{0,1,2,3,4,5,6,7} log_must zpool create -f $MMP_POOL mirror $MMP_DIR/file.{0,1} mirror $MMP_DIR/file.{2,3,4,5,6,7} # Step 2 log_must mmp_set_hostid $HOSTID1 log_must zpool set multihost=on $MMP_POOL set_tunable64 MULTIHOST_HISTORY 0 set_tunable64 MULTIHOST_HISTORY 40 # Step 3 # default settings, every leaf written once/second sleep 4 # Step 4 typeset -i min_writes=999 typeset -i max_writes=0 typeset -i write_count # copy to get as close to a consistent view as possible cat $MMP_HISTORY > $MMP_HISTORY_TMP for x in $(seq 0 7); do write_count=$(grep -c file.${x} $MMP_HISTORY_TMP) if [ $write_count -lt $min_writes ]; then min_writes=$write_count fi if [ $write_count -gt $max_writes ]; then max_writes=$write_count fi done log_note "mmp min_writes $min_writes max_writes $max_writes" if [ $min_writes -lt 1 ]; then log_fail "mmp writes were not counted correctly" fi if [ $((max_writes - min_writes)) -gt 1 ]; then log_fail "mmp writes were not evenly distributed across leaf vdevs" fi log_pass "mmp writes were evenly distributed across leaf vdevs"