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Increase default chunk size to 512K 

This seems more appropriate for current (and recent) model drives than
64K.
64K is still the default for '--build' as changing that could corrupt
data.
64K is also the default rounding for 'linear' on kernels older than
2.6.16.

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2009-11-17 13:08:55 +11:00
parent df0d4ea04e
commit 5f175898de
20 changed files with 51 additions and 41 deletions
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9
Create.c
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@ -234,8 +234,15 @@ int Create(struct supertype *st, char *mddev,
case 10: case 10:
case 6: case 6:
case 0: case 0:
case LEVEL_LINEAR: /* linear */
if (chunk == 0) { if (chunk == 0) {
chunk = 512;
if (verbose > 0)
fprintf(stderr, Name ": chunk size defaults to 512K\n");
}
break;
case LEVEL_LINEAR:
/* a chunksize of zero 0s perfectly valid (and preferred) since 2.6.16 */
if (get_linux_version() < 2006016 && chunk == 0) {
chunk = 64; chunk = 64;
if (verbose > 0) if (verbose > 0)
fprintf(stderr, Name ": chunk size defaults to 64K\n"); fprintf(stderr, Name ": chunk size defaults to 64K\n");

7
mdadm.8
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@ -440,7 +440,9 @@ before the number of devices in the array is reduced.
.TP .TP
.BR \-c ", " \-\-chunk= .BR \-c ", " \-\-chunk=
Specify chunk size of kibibytes. The default is 64. Specify chunk size of kibibytes. The default when creating an
array is 512KB. To ensure compatibility with earlier versions, the
default when Building and array with no persistent metadata is 64KB.
This is only meaningful for RAID0, RAID4, RAID5, RAID6, and RAID10. This is only meaningful for RAID0, RAID4, RAID5, RAID6, and RAID10.
.TP .TP
@ -450,7 +452,8 @@ component will be rounded down to a multiple of this size.
This is a synonym for This is a synonym for
.B \-\-chunk .B \-\-chunk
but highlights the different meaning for Linear as compared to other but highlights the different meaning for Linear as compared to other
RAID levels. RAID levels. The default is 64K if a kernel earlier than 2.6.16 is in
use, and is 0K (i.e. no rounding) in later kernels.
.TP .TP
.BR \-l ", " \-\-level= .BR \-l ", " \-\-level=

4
tests/00linear
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@ -3,13 +3,13 @@
mdadm -CR $md0 -l linear -n3 $dev0 $dev1 $dev2 mdadm -CR $md0 -l linear -n3 $dev0 $dev1 $dev2
check linear check linear
testdev $md0 3 $mdsize0 64 testdev $md0 3 $mdsize0 1
mdadm -S $md0 mdadm -S $md0
# now with version-1 superblock # now with version-1 superblock
mdadm -CR $md0 -e1 --level=linear -n4 $dev0 $dev1 $dev2 $dev3 mdadm -CR $md0 -e1 --level=linear -n4 $dev0 $dev1 $dev2 $dev3
check linear check linear
testdev $md0 4 $mdsize1 64 testdev $md0 4 $mdsize1 1
mdadm -S $md0 mdadm -S $md0
# now with no superblock # now with no superblock

6
tests/00raid0
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@ -3,19 +3,19 @@
mdadm -CR $md0 -l raid0 -n3 $dev0 $dev1 $dev2 mdadm -CR $md0 -l raid0 -n3 $dev0 $dev1 $dev2
check raid0 check raid0
testdev $md0 3 $mdsize0 64 testdev $md0 3 $mdsize0 512
mdadm -S $md0 mdadm -S $md0
# now with version-1 superblock # now with version-1 superblock
mdadm -CR $md0 -e1 -l0 -n4 $dev0 $dev1 $dev2 $dev3 mdadm -CR $md0 -e1 -l0 -n4 $dev0 $dev1 $dev2 $dev3
check raid0 check raid0
testdev $md0 4 $mdsize1 64 testdev $md0 4 $mdsize1 512
mdadm -S $md0 mdadm -S $md0
# now with no superblock # now with no superblock
mdadm -B $md0 -l0 -n5 $dev0 $dev1 $dev2 $dev3 $dev4 mdadm -B $md0 -l0 -n5 $dev0 $dev1 $dev2 $dev3 $dev4
check raid0 check raid0
testdev $md0 5 $size 64 testdev $md0 5 $size 512
mdadm -S $md0 mdadm -S $md0

2
tests/00raid10
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@ -13,6 +13,6 @@ do
esac esac
mdadm --create --run --level=raid10 --layout $lo --raid-disks 6 -x 1 $md0 $devs mdadm --create --run --level=raid10 --layout $lo --raid-disks 6 -x 1 $md0 $devs
check resync ; check raid10 check resync ; check raid10
testdev $md0 $m $mdsize0 $[64*cm] testdev $md0 $m $mdsize0 $[512*cm]
mdadm -S $md0 mdadm -S $md0
done done

4
tests/00raid4
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@ -3,13 +3,13 @@
mdadm -CfR $md0 -l 4 -n3 $dev0 $dev1 $dev2 mdadm -CfR $md0 -l 4 -n3 $dev0 $dev1 $dev2
check resync ; check raid[45] check resync ; check raid[45]
testdev $md0 2 $mdsize0 64 testdev $md0 2 $mdsize0 512
mdadm -S $md0 mdadm -S $md0
# now with version-1 superblock # now with version-1 superblock
mdadm -CR $md0 -e1 --level=raid4 -n4 $dev0 $dev1 $dev2 $dev3 mdadm -CR $md0 -e1 --level=raid4 -n4 $dev0 $dev1 $dev2 $dev3
check recovery; check raid[45] check recovery; check raid[45]
testdev $md0 3 $mdsize1 64 testdev $md0 3 $mdsize1 512
mdadm -S $md0 mdadm -S $md0

8
tests/00raid5
View File

@ -3,13 +3,13 @@
mdadm -CfR $md0 -l 5 -n3 $dev0 $dev1 $dev2 mdadm -CfR $md0 -l 5 -n3 $dev0 $dev1 $dev2
check resync check resync
testdev $md0 2 $mdsize0 64 testdev $md0 2 $mdsize0 512
mdadm -S $md0 mdadm -S $md0
# now with version-1 superblock # now with version-1 superblock
mdadm -CR $md0 -e1 --level=raid5 -n4 $dev0 $dev1 $dev2 $dev3 mdadm -CR $md0 -e1 --level=raid5 -n4 $dev0 $dev1 $dev2 $dev3
check recovery check recovery
testdev $md0 3 $mdsize1 64 testdev $md0 3 $mdsize1 512
mdadm -S $md0 mdadm -S $md0
# now same again with explicit layout # now same again with explicit layout
@ -19,13 +19,13 @@ do
mdadm -CfR $md0 -l 5 -p $lo -n3 $dev0 $dev1 $dev2 mdadm -CfR $md0 -l 5 -p $lo -n3 $dev0 $dev1 $dev2
check resync ; check raid5 check resync ; check raid5
testdev $md0 2 $mdsize0 64 testdev $md0 2 $mdsize0 512
mdadm -S $md0 mdadm -S $md0
# now with version-1 superblock # now with version-1 superblock
mdadm -CR $md0 -e1 --level=raid5 --layout $lo -n4 $dev0 $dev1 $dev2 $dev3 mdadm -CR $md0 -e1 --level=raid5 --layout $lo -n4 $dev0 $dev1 $dev2 $dev3
check recovery ; check raid5 check recovery ; check raid5
testdev $md0 3 $mdsize1 64 testdev $md0 3 $mdsize1 512
mdadm -S $md0 mdadm -S $md0
done done

4
tests/00raid6
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@ -3,13 +3,13 @@
mdadm -CfR $md0 -l 6 -n4 $dev0 $dev1 $dev2 $dev3 mdadm -CfR $md0 -l 6 -n4 $dev0 $dev1 $dev2 $dev3
check resync ; check raid6 check resync ; check raid6
testdev $md0 2 $mdsize0 64 testdev $md0 2 $mdsize0 512
mdadm -S $md0 mdadm -S $md0
# now with version-1 superblock # now with version-1 superblock
mdadm -CR $md0 -e1 --level=raid6 -n5 $dev0 $dev1 $dev2 $dev3 $dev4 mdadm -CR $md0 -e1 --level=raid6 -n5 $dev0 $dev1 $dev2 $dev3 $dev4
check resync ; check raid6 check resync ; check raid6
testdev $md0 3 $mdsize1 64 testdev $md0 3 $mdsize1 512
mdadm -S $md0 mdadm -S $md0

6
tests/02lineargrow
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@ -10,13 +10,13 @@ do
1.2 ) sz=$mdsize12 ;; 1.2 ) sz=$mdsize12 ;;
esac esac
mdadm -CRf $md0 --level linear -e $e --raid-disks=1 $dev1 mdadm -CRf $md0 --level linear -e $e --raid-disks=1 $dev1
testdev $md0 1 $sz 64 testdev $md0 1 $sz 1
mdadm --grow $md0 --add $dev2 mdadm --grow $md0 --add $dev2
testdev $md0 2 $sz 64 testdev $md0 2 $sz 1
mdadm --grow $md0 --add $dev3 mdadm --grow $md0 --add $dev3
testdev $md0 3 $sz 64 testdev $md0 3 $sz 1
mdadm -S $md0 mdadm -S $md0
done done

4
tests/02r5grow
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@ -10,11 +10,11 @@ testdev $md0 2 $[size/2] 32
mdadm --grow $md0 --size max mdadm --grow $md0 --size max
check resync check resync
check wait check wait
testdev $md0 2 $mdsize0 64 testdev $md0 2 $mdsize0 32
mdadm --grow $md0 --size $[size/2] mdadm --grow $md0 --size $[size/2]
check nosync check nosync
testdev $md0 2 $[size/2] 64 testdev $md0 2 $[size/2] 32
mdadm -S $md0 mdadm -S $md0

4
tests/02r6grow
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@ -10,11 +10,11 @@ testdev $md0 2 $[size/2] 32
mdadm --grow $md0 --size max mdadm --grow $md0 --size max
check resync check resync
check wait check wait
testdev $md0 2 $mdsize0 64 testdev $md0 2 $mdsize0 32
mdadm --grow $md0 --size $[size/2] mdadm --grow $md0 --size $[size/2]
check nosync check nosync
testdev $md0 2 $[size/2] 64 testdev $md0 2 $[size/2] 32
mdadm -S $md0 mdadm -S $md0

4
tests/03r0assem
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@ -6,7 +6,7 @@
mdadm -CR $md2 -l0 -n3 $dev0 $dev1 $dev2 mdadm -CR $md2 -l0 -n3 $dev0 $dev1 $dev2
check raid0 check raid0
tst="testdev $md2 3 $mdsize0 64" tst="testdev $md2 3 $mdsize0 512"
$tst $tst
uuid=`mdadm -Db $md2 | sed 's/.*UUID=//'` uuid=`mdadm -Db $md2 | sed 's/.*UUID=//'`
mdadm -S $md2 mdadm -S $md2
@ -70,7 +70,7 @@ mdadm -S $md2
mdadm --zero-superblock $dev0 $dev1 $dev2 mdadm --zero-superblock $dev0 $dev1 $dev2
mdadm -CR $md2 -l0 --metadata=1.0 -n3 $dev0 $dev1 $dev2 mdadm -CR $md2 -l0 --metadata=1.0 -n3 $dev0 $dev1 $dev2
check raid0 check raid0
tst="testdev $md2 3 $mdsize1 64" tst="testdev $md2 3 $mdsize1 512"
$tst $tst
uuid=`mdadm -Db $md2 | sed 's/.*UUID=//'` uuid=`mdadm -Db $md2 | sed 's/.*UUID=//'`

2
tests/03r5assem
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@ -3,7 +3,7 @@
# including with missing devices. # including with missing devices.
mdadm -CR $md1 -l5 -n3 $dev0 $dev1 $dev2 mdadm -CR $md1 -l5 -n3 $dev0 $dev1 $dev2
tst="check raid5 ;testdev $md1 2 $mdsize0 64 ; mdadm -S $md1" tst="check raid5 ;testdev $md1 2 $mdsize0 512 ; mdadm -S $md1"
uuid=`mdadm -Db $md1 | sed 's/.*UUID=//'` uuid=`mdadm -Db $md1 | sed 's/.*UUID=//'`
check wait check wait
eval $tst eval $tst

2
tests/03r5assemV1
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@ -2,7 +2,7 @@
# create a v-1 raid5 array and assemble in various ways # create a v-1 raid5 array and assemble in various ways
mdadm -CR -e1 --name one $md1 -l5 -n3 -x2 $dev0 $dev1 $dev2 $dev3 $dev4 mdadm -CR -e1 --name one $md1 -l5 -n3 -x2 $dev0 $dev1 $dev2 $dev3 $dev4
tst="check raid5 ;testdev $md1 2 $mdsize1 64 ; mdadm -S $md1" tst="check raid5 ;testdev $md1 2 $mdsize1 512 ; mdadm -S $md1"
uuid=`mdadm -Db $md1 | sed 's/.*UUID=//'` uuid=`mdadm -Db $md1 | sed 's/.*UUID=//'`
check wait check wait

2
tests/04r0update
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@ -1,7 +1,7 @@
# create a raid0, re-assemble with a different super-minor # create a raid0, re-assemble with a different super-minor
mdadm -CR $md0 -l0 -n3 $dev0 $dev1 $dev2 mdadm -CR $md0 -l0 -n3 $dev0 $dev1 $dev2
testdev $md0 3 $mdsize0 64 testdev $md0 3 $mdsize0 512
minor1=`mdadm -E $dev0 | sed -n -e 's/.*Preferred Minor : //p'` minor1=`mdadm -E $dev0 | sed -n -e 's/.*Preferred Minor : //p'`
mdadm -S /dev/md0 mdadm -S /dev/md0

4
tests/07autoassemble
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@ -10,7 +10,7 @@ mdadm -Ss
mdadm -As -c /dev/null --homehost=testing -vvv mdadm -As -c /dev/null --homehost=testing -vvv
testdev $md1 1 $mdsize0 64 testdev $md1 1 $mdsize0 64
testdev $md2 1 $mdsize0 64 testdev $md2 1 $mdsize0 64
testdev $md0 2 $mdsize00 64 testdev $md0 2 $mdsize00 512
mdadm -Ss mdadm -Ss
mdadm --zero-superblock $dev0 $dev1 $dev2 $dev3 mdadm --zero-superblock $dev0 $dev1 $dev2 $dev3
@ -20,5 +20,5 @@ mdadm -CR $md0 -l0 -n2 $md1 $dev2 --homehost=testing
mdadm -Ss mdadm -Ss
mdadm -As -c /dev/null --homehost=testing -vvv mdadm -As -c /dev/null --homehost=testing -vvv
testdev $md1 1 $mdsize0 64 testdev $md1 1 $mdsize0 64
testdev $md0 1 $[mdsize0+mdsize00] 64 testdev $md0 1 $[mdsize0+mdsize00] 512
mdadm -Ss mdadm -Ss

4
tests/07changelevels
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@ -89,10 +89,10 @@ mdadm $md0 --fail $dev3
# switch layout to a DDF layout and back to make sure that works. # switch layout to a DDF layout and back to make sure that works.
mdadm -G /dev/md0 --layout=ddf-N-continue --backup-file $bu mdadm -G /dev/md0 --layout=ddf-N-continue --backup-file $bu
checkgeo md0 raid6 4 $[64*1024] 10 checkgeo md0 raid6 4 $[512*1024] 10
dotest 2 dotest 2
mdadm -G /dev/md0 --layout=ra --backup-file $bu mdadm -G /dev/md0 --layout=ra --backup-file $bu
checkgeo md0 raid6 4 $[64*1024] 1 checkgeo md0 raid6 4 $[512*1024] 1
dotest 2 dotest 2
mdadm -G $md0 -l5 --backup-file $bu mdadm -G $md0 -l5 --backup-file $bu

6
tests/07layouts
View File

@ -12,7 +12,7 @@ export MDADM_GROW_VERITY=1
dotest() { dotest() {
sleep 0.5 sleep 0.5
check wait check wait
testdev $md0 $1 $mdsize0 64 nd testdev $md0 $1 $mdsize0 512 nd
blockdev --flushbufs $md0 blockdev --flushbufs $md0
cmp -s -n $[textK*1024] $md0 /tmp/RandFile || { echo cmp failed; exit 2; } cmp -s -n $[textK*1024] $md0 /tmp/RandFile || { echo cmp failed; exit 2; }
# write something new - shift chars 4 space # write something new - shift chars 4 space
@ -59,7 +59,7 @@ l5[5]=parity-last
for layout in 0 1 2 3 4 5 0 for layout in 0 1 2 3 4 5 0
do do
mdadm -G $md0 --layout=${l5[$layout]} --backup-file $bu mdadm -G $md0 --layout=${l5[$layout]} --backup-file $bu
checkgeo md0 raid5 5 $[64*1024] $layout checkgeo md0 raid5 5 $[512*1024] $layout
dotest 4 dotest 4
done done
@ -86,6 +86,6 @@ l6[20]=parity-first-6
for layout in 0 1 2 3 4 5 8 9 10 16 17 18 19 20 0 for layout in 0 1 2 3 4 5 8 9 10 16 17 18 19 20 0
do do
mdadm -G $md0 --layout=${l6[$layout]} --backup-file $bu mdadm -G $md0 --layout=${l6[$layout]} --backup-file $bu
checkgeo md0 raid6 5 $[64*1024] $layout checkgeo md0 raid6 5 $[512*1024] $layout
dotest 3 dotest 3
done done

2
tests/07reshape5intr
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@ -12,7 +12,7 @@ do
do dd if=/dev/urandom of=$d bs=1024 || true do dd if=/dev/urandom of=$d bs=1024 || true
done done
mdadm -CR $md0 -amd -l5 -n$disks --assume-clean $devs mdadm -CR $md0 -amd -l5 -c 256 -n$disks --assume-clean $devs
mdadm $md0 --add $dev6 mdadm $md0 --add $dev6
echo 20 > /proc/sys/dev/raid/speed_limit_max echo 20 > /proc/sys/dev/raid/speed_limit_max
mdadm --grow $md0 -n $[disks+1] mdadm --grow $md0 -n $[disks+1]

8
tests/10ddf-create
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@ -12,10 +12,10 @@ mdadm -CR /dev/md/ddf0 -e ddf -n 5 $dev8 $dev9 $dev10 $dev11 $dev12
mdadm -CR r0 -l0 -n5 /dev/md/ddf0 -z 5000 mdadm -CR r0 -l0 -n5 /dev/md/ddf0 -z 5000
mdadm -CR r1 -l1 -n2 /dev/md/ddf0 mdadm -CR r1 -l1 -n2 /dev/md/ddf0
mdadm -CR r5 -l5 -n3 /dev/md/ddf0 mdadm -CR r5 -l5 -n3 /dev/md/ddf0
testdev /dev/md/r0 5 5000 64 testdev /dev/md/r0 5 5000 512
# r0 will use 4992 due to chunk size, so that leave 27776 for the rest # r0 will use 4608 due to chunk size, so that leaves 28160 for the rest
testdev /dev/md/r1 1 27776 1 testdev /dev/md/r1 1 28160 1
testdev /dev/md/r5 2 27776 64 testdev /dev/md/r5 2 28160 512
dd if=/dev/sda of=/dev/md/r0 || true dd if=/dev/sda of=/dev/md/r0 || true
dd if=/dev/sda of=/dev/md/r1 || true dd if=/dev/sda of=/dev/md/r1 || true
dd if=/dev/sda of=/dev/md/r5 || true dd if=/dev/sda of=/dev/md/r5 || true