diff mbox series

[08/10] btrfs: test repair with sectors corrupted in multiple mirrors

Message ID 20220527081915.2024853-9-hch@lst.de (mailing list archive)
State New, archived
Headers show
Series [01/10] btrfs: add a helpers for read repair testing | expand

Commit Message

Christoph Hellwig May 27, 2022, 8:19 a.m. UTC
Test that repair handles the case where it needs to read from more than
a single mirror on the raid1c3 profile.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Qu Wenruo <wqu@suse.com>
---
 tests/btrfs/265     | 85 +++++++++++++++++++++++++++++++++++++++++++++
 tests/btrfs/265.out | 75 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 160 insertions(+)
 create mode 100755 tests/btrfs/265
 create mode 100644 tests/btrfs/265.out

Comments

Anand Jain May 30, 2022, 12:50 a.m. UTC | #1
looks good.

Reviewed-by: Anand Jain <anand.jain@oracle.com>

Thanks, Anand


On 5/27/22 13:49, Christoph Hellwig wrote:
> Test that repair handles the case where it needs to read from more than
> a single mirror on the raid1c3 profile.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> Reviewed-by: Qu Wenruo <wqu@suse.com>
> ---
>   tests/btrfs/265     | 85 +++++++++++++++++++++++++++++++++++++++++++++
>   tests/btrfs/265.out | 75 +++++++++++++++++++++++++++++++++++++++
>   2 files changed, 160 insertions(+)
>   create mode 100755 tests/btrfs/265
>   create mode 100644 tests/btrfs/265.out
> 
> diff --git a/tests/btrfs/265 b/tests/btrfs/265
> new file mode 100755
> index 00000000..b75d9c84
> --- /dev/null
> +++ b/tests/btrfs/265
> @@ -0,0 +1,85 @@
> +#! /bin/bash
> +# SPDX-License-Identifier: GPL-2.0
> +# Copyright (c) 2017 Liu Bo.  All Rights Reserved.
> +# Copyright (c) 2022 Christoph Hellwig.
> +#
> +# FS QA Test 265
> +#
> +# Test that btrfs raid repair on a raid1c3 profile can repair corruption on two
> +# mirrors for the same logical offset.
> +#
> +. ./common/preamble
> +_begin_fstest auto quick read_repair
> +
> +# Import common functions.
> +. ./common/filter
> +
> +# real QA test starts here
> +
> +_supported_fs btrfs
> +_require_scratch_dev_pool 3
> +
> +_require_odirect
> +# Overwriting data is forbidden on a zoned block device
> +_require_non_zoned_device "${SCRATCH_DEV}"
> +
> +_scratch_dev_pool_get 3
> +# step 1, create a raid1 btrfs which contains one 128k file.
> +echo "step 1......mkfs.btrfs"
> +
> +mkfs_opts="-d raid1c3 -b 1G"
> +_scratch_pool_mkfs $mkfs_opts >>$seqres.full 2>&1
> +
> +_scratch_mount
> +
> +$XFS_IO_PROG -f -d -c "pwrite -S 0xaa -b 128K 0 128K" \
> +	"$SCRATCH_MNT/foobar" | \
> +	_filter_xfs_io_offset
> +
> +# step 2, corrupt the first 64k of one copy (on SCRATCH_DEV which is the first
> +# one in $SCRATCH_DEV_POOL
> +echo "step 2......corrupt file extent"
> +
> +# ensure btrfs-map-logical sees the tree updates
> +sync
> +
> +logical=$(_btrfs_get_first_logical $SCRATCH_MNT/foobar)
> +
> +physical1=$(_btrfs_get_physical ${logical} 1)
> +devpath1=$(_btrfs_get_device_path ${logical} 1)
> +
> +physical2=$(_btrfs_get_physical ${logical} 2)
> +devpath2=$(_btrfs_get_device_path ${logical} 2)
> +
> +_scratch_unmount
> +
> +echo " corrupt stripe #1, devpath $devpath1 physical $physical1" \
> +	>> $seqres.full
> +$XFS_IO_PROG -d -c "pwrite -S 0xbf -b 64K $physical1 64K" $devpath1 \
> +	> /dev/null
> +
> +echo " corrupt stripe #2, devpath $devpath2 physical $physical2" \
> +	>> $seqres.full
> +$XFS_IO_PROG -d -c "pwrite -S 0xbf -b 64K $physical2 64K" $devpath2 \
> +	> /dev/null
> +
> +_scratch_mount
> +
> +# step 3, 128k dio read (this read can repair bad copy)
> +echo "step 3......repair the bad copy"
> +
> +_btrfs_direct_read_on_mirror 0 3 "$SCRATCH_MNT/foobar" 0 128K
> +_btrfs_direct_read_on_mirror 1 3 "$SCRATCH_MNT/foobar" 0 128K
> +
> +_scratch_unmount
> +

> +echo "step 4......check if the repair worked"
> +$XFS_IO_PROG -d -c "pread -v -b 512 $physical1 512" $devpath1 |\
> +	_filter_xfs_io_offset
> +$XFS_IO_PROG -d -c "pread -v -b 512 $physical2 512" $devpath2 |\
> +	_filter_xfs_io_offset


> +
> +_scratch_dev_pool_put
> +# success, all done
> +status=0
> +exit
> diff --git a/tests/btrfs/265.out b/tests/btrfs/265.out
> new file mode 100644
> index 00000000..c62c7a39
> --- /dev/null
> +++ b/tests/btrfs/265.out
> @@ -0,0 +1,75 @@
> +QA output created by 265
> +step 1......mkfs.btrfs
> +wrote 131072/131072 bytes
> +XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> +step 2......corrupt file extent
> +step 3......repair the bad copy
> +step 4......check if the repair worked
> +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  ................
> +read 512/512 bytes
> +XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> +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  ................
> +read 512/512 bytes
> +XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
diff mbox series

Patch

diff --git a/tests/btrfs/265 b/tests/btrfs/265
new file mode 100755
index 00000000..b75d9c84
--- /dev/null
+++ b/tests/btrfs/265
@@ -0,0 +1,85 @@ 
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2017 Liu Bo.  All Rights Reserved.
+# Copyright (c) 2022 Christoph Hellwig.
+#
+# FS QA Test 265
+#
+# Test that btrfs raid repair on a raid1c3 profile can repair corruption on two
+# mirrors for the same logical offset.
+#
+. ./common/preamble
+_begin_fstest auto quick read_repair
+
+# Import common functions.
+. ./common/filter
+
+# real QA test starts here
+
+_supported_fs btrfs
+_require_scratch_dev_pool 3
+
+_require_odirect
+# Overwriting data is forbidden on a zoned block device
+_require_non_zoned_device "${SCRATCH_DEV}"
+
+_scratch_dev_pool_get 3
+# step 1, create a raid1 btrfs which contains one 128k file.
+echo "step 1......mkfs.btrfs"
+
+mkfs_opts="-d raid1c3 -b 1G"
+_scratch_pool_mkfs $mkfs_opts >>$seqres.full 2>&1
+
+_scratch_mount
+
+$XFS_IO_PROG -f -d -c "pwrite -S 0xaa -b 128K 0 128K" \
+	"$SCRATCH_MNT/foobar" | \
+	_filter_xfs_io_offset
+
+# step 2, corrupt the first 64k of one copy (on SCRATCH_DEV which is the first
+# one in $SCRATCH_DEV_POOL
+echo "step 2......corrupt file extent"
+
+# ensure btrfs-map-logical sees the tree updates
+sync
+
+logical=$(_btrfs_get_first_logical $SCRATCH_MNT/foobar)
+
+physical1=$(_btrfs_get_physical ${logical} 1)
+devpath1=$(_btrfs_get_device_path ${logical} 1)
+
+physical2=$(_btrfs_get_physical ${logical} 2)
+devpath2=$(_btrfs_get_device_path ${logical} 2)
+
+_scratch_unmount
+
+echo " corrupt stripe #1, devpath $devpath1 physical $physical1" \
+	>> $seqres.full
+$XFS_IO_PROG -d -c "pwrite -S 0xbf -b 64K $physical1 64K" $devpath1 \
+	> /dev/null
+
+echo " corrupt stripe #2, devpath $devpath2 physical $physical2" \
+	>> $seqres.full
+$XFS_IO_PROG -d -c "pwrite -S 0xbf -b 64K $physical2 64K" $devpath2 \
+	> /dev/null
+
+_scratch_mount
+
+# step 3, 128k dio read (this read can repair bad copy)
+echo "step 3......repair the bad copy"
+
+_btrfs_direct_read_on_mirror 0 3 "$SCRATCH_MNT/foobar" 0 128K
+_btrfs_direct_read_on_mirror 1 3 "$SCRATCH_MNT/foobar" 0 128K
+
+_scratch_unmount
+
+echo "step 4......check if the repair worked"
+$XFS_IO_PROG -d -c "pread -v -b 512 $physical1 512" $devpath1 |\
+	_filter_xfs_io_offset
+$XFS_IO_PROG -d -c "pread -v -b 512 $physical2 512" $devpath2 |\
+	_filter_xfs_io_offset
+
+_scratch_dev_pool_put
+# success, all done
+status=0
+exit
diff --git a/tests/btrfs/265.out b/tests/btrfs/265.out
new file mode 100644
index 00000000..c62c7a39
--- /dev/null
+++ b/tests/btrfs/265.out
@@ -0,0 +1,75 @@ 
+QA output created by 265
+step 1......mkfs.btrfs
+wrote 131072/131072 bytes
+XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+step 2......corrupt file extent
+step 3......repair the bad copy
+step 4......check if the repair worked
+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  ................
+read 512/512 bytes
+XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+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  ................
+read 512/512 bytes
+XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)