From patchwork Mon Jul 4 09:03:45 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 12904878 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 526E2C43334 for ; Mon, 4 Jul 2022 09:03:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233469AbiGDJDy (ORCPT ); Mon, 4 Jul 2022 05:03:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35084 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233208AbiGDJDx (ORCPT ); Mon, 4 Jul 2022 05:03:53 -0400 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:3::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B39B4F30; Mon, 4 Jul 2022 02:03:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: MIME-Version:Message-Id:Date:Subject:To:From:Sender:Reply-To:Cc:Content-Type: Content-ID:Content-Description:In-Reply-To:References; bh=fNkxgl93txPYQsmuo+Q+1UC1sCImm3R8fkCSNe2pKRs=; b=BdxaD/LWkGO36gl/QuHN57fyA5 QJqaSDGLNe/U9vALBBTQK9/i9UjZYTm6xWtrMmmxJXqH4zvF+AWSRXHghMVaOPIjbOtCGoLI/2/cc dj7I6kp42iXb15Xxji9Vgh2vfJjITXceJqvSQ++SjVJKQ4XdHf3WmxZJ8WDVc30Ec41sGGchutjz5 b+VhYe73PN0RqjuJKieV9h65nZVVzVwa+CcvzVSwD1tcU1egjuXi4a1y4Y7W9cu4EgUXCE3SIKZeT t0nb8f/SwKEMJNdmlyRO8Bk+tkhi3SILDTAlmeUwC9pus2KdkTBYEfSlAbjVRZpGkqhZyIgVXx/ox OuZDGapg==; Received: from 089144208244.atnat0017.highway.a1.net ([89.144.208.244] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1o8Hzj-006Gdd-MS; Mon, 04 Jul 2022 09:03:52 +0000 From: Christoph Hellwig To: fstests@vger.kernel.org, linux-btrfs@vger.kernel.org Subject: [PATCH 1/2] common: provide generic block error injection helper Date: Mon, 4 Jul 2022 11:03:45 +0200 Message-Id: <20220704090346.108134-1-hch@lst.de> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org Various tests have more or less copy and pasted code to enable and disable block layer "fail make request" error injection. Move that to a set of common helpers and use those in the drivers. btrfs/150 differened from the other two in a few ways, like selecting a not quite as big number to fail all requests in the small critical section and clearing a bunch of never set attributes in the failure injection configuration, but none of those matter for the test execution. Signed-off-by: Christoph Hellwig --- common/inject | 33 +++++++++++++++++++++++++++++++++ tests/btrfs/088 | 24 +++++------------------- tests/btrfs/150 | 27 +++++---------------------- tests/generic/019 | 44 +++++++++----------------------------------- 4 files changed, 52 insertions(+), 76 deletions(-) diff --git a/common/inject b/common/inject index 6b590804..137ff5fd 100644 --- a/common/inject +++ b/common/inject @@ -111,3 +111,36 @@ _scratch_inject_error() _fail "Cannot inject error ${type} value ${value}." fi } + +# enable block error injection globally +_enable_fail_make_request() +{ + echo 100 > $DEBUGFS_MNT/fail_make_request/probability + echo 9999999 > $DEBUGFS_MNT/fail_make_request/times + echo 0 > /sys/kernel/debug/fail_make_request/verbose +} + +# disable block error injection globally +_disable_fail_make_request() +{ + echo 0 > $DEBUGFS_MNT/fail_make_request/probability + echo 0 > $DEBUGFS_MNT/fail_make_request/times +} + +# make a device always fail +_start_fail_dev() +{ + local sysfs_bdev=`_sysfs_dev $1` + + echo " echo 1 > $sysfs_bdev/make-it-fail" >> $seqres.full + echo 1 > $sysfs_bdev/make-it-fail +} + +# stop a device from failing +_stop_fail_dev() +{ + local sysfs_bdev=`_sysfs_dev $1` + + echo " echo 0 > $sysfs_bdev/make-it-fail" >> $seqres.full + echo 0 > $sysfs_bdev/make-it-fail +} diff --git a/tests/btrfs/088 b/tests/btrfs/088 index d9c5528b..bd02401a 100755 --- a/tests/btrfs/088 +++ b/tests/btrfs/088 @@ -18,29 +18,13 @@ _begin_fstest auto quick metadata # Import common functions. . ./common/filter +. ./common/inject # real QA test starts here _supported_fs btrfs _require_scratch _require_fail_make_request -SYSFS_BDEV=`_sysfs_dev $SCRATCH_DEV` - -enable_io_failure() -{ - echo 100 > $DEBUGFS_MNT/fail_make_request/probability - echo 1000 > $DEBUGFS_MNT/fail_make_request/times - echo 0 > $DEBUGFS_MNT/fail_make_request/verbose - echo 1 > $SYSFS_BDEV/make-it-fail -} - -disable_io_failure() -{ - echo 0 > $SYSFS_BDEV/make-it-fail - echo 0 > $DEBUGFS_MNT/fail_make_request/probability - echo 0 > $DEBUGFS_MNT/fail_make_request/times -} - # We will abort a btrfs transaction later, which always produces a warning in # dmesg. We do not want the test to fail because of this. _disable_dmesg_check @@ -72,12 +56,14 @@ $XFS_IO_PROG -c "pwrite -S 0xbb 512K 1M" $SCRATCH_MNT/foo | _filter_xfs_io # perform a discard operation against the pinned exents. This made the fs # unmountable because the btree roots that the superblock points at were written # in place (by the discard operations). -enable_io_failure +_enable_fail_make_request +_start_fail_dev $SCRATCH_DEV # This sync will trigger a commit of the current transaction, which will be # aborted because IO will fail for metadata extents (btree nodes/leafs). sync -disable_io_failure +_stop_fail_dev $SCRATCH_DEV +_disable_fail_make_request touch $SCRATCH_MNT/abc >>$seqres.full 2>&1 && \ echo "Transaction was not aborted, filesystem is not in readonly mode" diff --git a/tests/btrfs/150 b/tests/btrfs/150 index c5e9c709..cc80cb41 100755 --- a/tests/btrfs/150 +++ b/tests/btrfs/150 @@ -15,6 +15,7 @@ _begin_fstest auto quick dangerous read_repair # Import common functions. . ./common/filter +. ./common/inject # real QA test starts here @@ -25,24 +26,6 @@ _require_fail_make_request _require_scratch_dev_pool 2 _scratch_dev_pool_get 2 -SYSFS_BDEV=`_sysfs_dev $SCRATCH_DEV` -enable_io_failure() -{ - echo 100 > $DEBUGFS_MNT/fail_make_request/probability - echo 1000 > $DEBUGFS_MNT/fail_make_request/times - echo 0 > $DEBUGFS_MNT/fail_make_request/verbose - echo 1 > $DEBUGFS_MNT/fail_make_request/task-filter - echo 1 > $SYSFS_BDEV/make-it-fail -} - -disable_io_failure() -{ - echo 0 > $DEBUGFS_MNT/fail_make_request/probability - echo 0 > $DEBUGFS_MNT/fail_make_request/times - echo 0 > $DEBUGFS_MNT/fail_make_request/task-filter - echo 0 > $SYSFS_BDEV/make-it-fail -} - _check_minimal_fs_size $(( 1024 * 1024 * 1024 )) _scratch_pool_mkfs "-d raid1 -b 1G" >> $seqres.full 2>&1 @@ -59,15 +42,15 @@ while [[ -z $result ]]; do # invalidate the page cache $XFS_IO_PROG -f -c "fadvise -d 0 8K" $SCRATCH_MNT/foobar - enable_io_failure - + _enable_fail_make_request + _start_fail_dev $SCRATCH_DEV result=$(bash -c " if [ \$((\$\$ % 2)) == 1 ]; then echo 1 > /proc/\$\$/make-it-fail exec $XFS_IO_PROG -c \"pread 0 8K\" \$SCRATCH_MNT/foobar fi") - - disable_io_failure + _stop_fail_dev $SCRATCH_DEV + _disable_fail_make_request done _scratch_dev_pool_put diff --git a/tests/generic/019 b/tests/generic/019 index 45c91624..3cfcb7c5 100755 --- a/tests/generic/019 +++ b/tests/generic/019 @@ -14,47 +14,18 @@ fio_config=$tmp.fio # Import common functions. . ./common/filter +. ./common/inject _supported_fs generic _require_scratch _require_block_device $SCRATCH_DEV _require_fail_make_request -SYSFS_BDEV=`_sysfs_dev $SCRATCH_DEV` - -allow_fail_make_request() -{ - echo "Allow global fail_make_request feature" - echo 100 > $DEBUGFS_MNT/fail_make_request/probability - echo 9999999 > $DEBUGFS_MNT/fail_make_request/times - echo 0 > /sys/kernel/debug/fail_make_request/verbose -} - -disallow_fail_make_request() -{ - echo "Disallow global fail_make_request feature" - echo 0 > $DEBUGFS_MNT/fail_make_request/probability - echo 0 > $DEBUGFS_MNT/fail_make_request/times -} - -start_fail_scratch_dev() -{ - echo "Force SCRATCH_DEV device failure" - echo " echo 1 > $SYSFS_BDEV/make-it-fail" >> $seqres.full - echo 1 > $SYSFS_BDEV/make-it-fail -} - -stop_fail_scratch_dev() -{ - echo "Make SCRATCH_DEV device operable again" - echo " echo 0 > $SYSFS_BDEV/make-it-fail" >> $seqres.full - echo 0 > $SYSFS_BDEV/make-it-fail -} - # Override the default cleanup function. _cleanup() { kill $fs_pid $fio_pid &> /dev/null - disallow_fail_make_request + echo "Disallow global fail_make_request feature" + _disable_fail_make_request cd / rm -r -f $tmp.* } @@ -129,7 +100,8 @@ _workout() # Let's it work for awhile, and force device failure sleep $RUN_TIME - start_fail_scratch_dev + echo "Force SCRATCH_DEV device failure" + _start_fail_dev $SCRATCH_DEV # After device turns in to failed state filesystem may yet not know about # that so buffered write(2) may succeed, but any integrity operations # such as (sync, fsync, fdatasync, direct-io) should fail. @@ -147,7 +119,8 @@ _workout() run_check _scratch_unmount # Once filesystem was umounted no one is able to write to block device # It is now safe to bring device back to normal state - stop_fail_scratch_dev + echo "Make SCRATCH_DEV device operable again" + _stop_fail_dev $SCRATCH_DEV # In order to check that filesystem is able to recover journal on mount(2) # perform mount/umount, after that all errors should be fixed @@ -159,7 +132,8 @@ _workout() _scratch_mkfs >> $seqres.full 2>&1 || _fail "mkfs failed" _scratch_mount -allow_fail_make_request +echo "Allow global fail_make_request feature" +_enable_fail_make_request _workout status=$? exit From patchwork Mon Jul 4 09:03:46 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 12904879 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8137EC43334 for ; Mon, 4 Jul 2022 09:04:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233476AbiGDJED (ORCPT ); Mon, 4 Jul 2022 05:04:03 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35178 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233472AbiGDJED (ORCPT ); Mon, 4 Jul 2022 05:04:03 -0400 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:3::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EDE2A2BE4; Mon, 4 Jul 2022 02:03:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:To:From:Sender: Reply-To:Cc:Content-Type:Content-ID:Content-Description; bh=BXMD3eBZWrMMKuXNz6z6e1fQKiIFb97oCky9PnYj5Eg=; b=JTB7ugRhoiGMy1hvPhgE/0eLNw IfLunhpQstJ6EIrlg+Jv3AI0FcVjNUvwm4vIM+wiYD0CbWPvwEt7tBj03BpwrmwGDYqA2QWAllmlg su1B7GJk1CEJ3aW8zIn56s/l2x21AEYvsOiJw3zcOG25IgVdkcOQ6VOe9ey4qKddpiPFSwU6a3S44 KWeUMPUV99Tw/gY3KMUWhi1BAVjiPao6WJWb3XUGEVfrRmnlASmbUtxgXlTtVzngmO4miEK9CLT34 MBiO90MCJZhdmKYqTjOp1YqZ0xST2/gYZSQoFFOU7x26/IJB1LnIIjUNPlaQzmudtiHHjJD1XnWMs nlJwVSTA==; Received: from 089144208244.atnat0017.highway.a1.net ([89.144.208.244] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1o8Hzq-006Ghd-0k; Mon, 04 Jul 2022 09:03:59 +0000 From: Christoph Hellwig To: fstests@vger.kernel.org, linux-btrfs@vger.kernel.org Subject: [PATCH 2/2] btrfs: test raid1 write error handling Date: Mon, 4 Jul 2022 11:03:46 +0200 Message-Id: <20220704090346.108134-2-hch@lst.de> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220704090346.108134-1-hch@lst.de> References: <20220704090346.108134-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org Test that a write with a single bad mirror works fine but reports errors in the error counters, and that a write with two bad mirrors fails. Signed-off-by: Christoph Hellwig --- tests/btrfs/271 | 78 +++++++ tests/btrfs/271.out | 521 ++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 599 insertions(+) create mode 100755 tests/btrfs/271 create mode 100644 tests/btrfs/271.out diff --git a/tests/btrfs/271 b/tests/btrfs/271 new file mode 100755 index 00000000..c21858d1 --- /dev/null +++ b/tests/btrfs/271 @@ -0,0 +1,78 @@ +#! /bin/bash +# SPDX-License-Identifier: GPL-2.0 +# Copyright (c) 2022 Christoph Hellwig. +# +# FS QA Test btrfs/271 +# +# Test btrfs write error propagation and reporting on the raid1 profile. +# +. ./common/preamble +_begin_fstest auto quick raid + +. ./common/filter + +_supported_fs btrfs +_require_scratch +_require_fail_make_request +_require_scratch_dev_pool 2 +_scratch_dev_pool_get 2 + +enable_io_failure() +{ + local sysfs_bdev=`_sysfs_dev $1` + + echo 1 > $sysfs_bdev/make-it-fail +} + +disable_io_failure() +{ + local sysfs_bdev=`_sysfs_dev $1` + + echo 0 > $sysfs_bdev/make-it-fail +} + +_check_minimal_fs_size $(( 1024 * 1024 * 1024 )) +_scratch_pool_mkfs "-d raid1 -b 1G" >> $seqres.full 2>&1 + +_scratch_mount + +dev2=`echo $SCRATCH_DEV_POOL | $AWK_PROG '{print $2}'` + +pagesize=$(get_page_size) +blocksize=$(_get_block_size $SCRATCH_MNT) +sectors_per_page=$(($pagesize / $blocksize)) + +# enable block I/O error injection +echo 100 > $DEBUGFS_MNT/fail_make_request/probability +echo 1000 > $DEBUGFS_MNT/fail_make_request/times +echo 0 > $DEBUGFS_MNT/fail_make_request/verbose + +echo "Step 1: writing with one failing mirror:" +enable_io_failure $SCRATCH_DEV +$XFS_IO_PROG -f -c "pwrite -W -S 0xaa 0 8K" $SCRATCH_MNT/foobar | _filter_xfs_io +disable_io_failure $SCRATCH_DEV + +errs=$($BTRFS_UTIL_PROG device stats $SCRATCH_DEV | \ + $AWK_PROG '/write_io_errs/ { print $2 }') +if [ $errs -ne $((4 * $sectors_per_page)) ]; then + _fail "Errors: $errs expected: 4" +fi + +echo "Step 2: verify that the data reads back fine:" +$XFS_IO_PROG -c "pread -v 0 8K" $SCRATCH_MNT/foobar | _filter_xfs_io_offset + +echo "Step 3: writing with two failing mirrors (should fail):" +enable_io_failure $SCRATCH_DEV +enable_io_failure $dev2 +$XFS_IO_PROG -f -c "pwrite -W -S 0xbb 0 8K" $SCRATCH_MNT/foobar | _filter_xfs_io +disable_io_failure $dev2 +disable_io_failure $SCRATCH_DEV + +# disable block I/O error injection +echo 0 > $DEBUGFS_MNT/fail_make_request/probability +echo 0 > $DEBUGFS_MNT/fail_make_request/times + +_scratch_dev_pool_put +# success, all done +status=0 +exit diff --git a/tests/btrfs/271.out b/tests/btrfs/271.out new file mode 100644 index 00000000..27451c37 --- /dev/null +++ b/tests/btrfs/271.out @@ -0,0 +1,521 @@ +QA output created by 271 +Step 1: writing with one failing mirror: +wrote 8192/8192 bytes at offset 0 +XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) +Step 2: verify that the data reads back fine: +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa 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................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +XXXXXXXX: aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa ................ +read 8192/8192 bytes +XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) +Step 3: writing with two failing mirrors (should fail): +fsync: Input/output error