From: Adam Goryachev <mailinglists@websitemanagers.com.au>
To: stan@hardwarefreak.com,
"linux-raid@vger.kernel.org" <linux-raid@vger.kernel.org>
Subject: Re: Growing RAID5 SSD Array
Date: Wed, 26 Mar 2014 00:10:35 +1100 [thread overview]
Message-ID: <5331804B.6010708@websitemanagers.com.au> (raw)
In-Reply-To: <532DE6FC.5010301@hardwarefreak.com>
I'll respond to the other email later on, but in between, I've found
something else that seems just plain wrong.
So, right now, I've shutdown most of the VM's (just one Linux VM left,
which should be mostly idle since it is after 11pm local time). I'm
trying to create a duplicate copy of one LV to another as a backup (in
case I mess it up). So, I've shutdown DRBD, so we are operating
independently (not that there is any change if DRBD is connected), I'm
running on the storage server itself (so no iscsi or network issues).
So, two LV's:
LV VG Attr LSize Pool Origin Data% Move Log Copy% Convert
backup_xptserver1_d1_20140325_224311 vg0 -wi-ao-- 453.00g
xptserver1_d1 vg0
-wi-ao-- 452.00g
running the command:
dd if=/dev/vg0/xptserver1_d1
of=/dev/vg0/backup_xptserver1_d1_20140325_224311
from another shell I run:
while pidof dd > /dev/null;do kill -USR1 `pidof dd`;sleep 10;done
dd shows this output:
99059692032 bytes (99 GB) copied, 2515.43 s, 39.4 MB/s
99403235840 bytes (99 GB) copied, 2525.45 s, 39.4 MB/s
99817538048 bytes (100 GB) copied, 2535.47 s, 39.4 MB/s
100252660224 bytes (100 GB) copied, 2545.49 s, 39.4 MB/s
iostat -dmx 1 shows this output:
sda - sdg are the RAID5 SSD drives, single partition, used by md only
dm-8 is the source for the dd copy
dm-17 is the destination of the dd copy,
dm-12 is the Linux VM which is currently running...
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s
avgrq-sz avgqu-sz await r_await w_await svctm %util
sdg 957.00 6767.00 930.00 356.00 8.68 27.65
57.85 0.65 0.50 0.16 1.39 0.37 48.00
sdd 956.00 6774.00 921.00 313.00 8.69 27.50
60.06 0.26 0.21 0.08 0.60 0.17 20.80
sda 940.00 6781.00 927.00 326.00 8.65 27.57
59.20 0.28 0.22 0.09 0.60 0.17 20.80
sdf 967.00 6768.00 927.00 320.00 8.70 27.50
59.46 0.29 0.23 0.12 0.55 0.16 20.00
sde 943.00 6770.00 933.00 369.00 8.69 27.71
57.26 0.74 0.57 0.16 1.60 0.44 57.20
sdc 983.00 6790.00 937.00 317.00 8.86 27.55
59.46 1.58 1.27 0.71 2.90 0.49 61.60
sdb 966.00 6813.00 929.00 313.00 8.76 27.57
59.92 1.20 0.97 0.34 2.84 0.49 61.20
md1 0.00 0.00 12037.00 42030.00 56.42 164.04
8.35 0.00 0.00 0.00 0.00 0.00 0.00
drbd2 0.00 0.00 12034.00 41989.00 56.41 164.02
8.36 177.73 3.31 0.46 4.13 0.02 91.60
dm-8 0.00 0.00 5955.00 0.00 23.26 0.00
8.00 4.43 0.74 0.74 0.00 0.01 6.40
dm-12 0.00 0.00 254.00 5.00 10.39 0.02
82.38 0.28 1.08 1.01 4.80 0.59 15.20
dm-17 0.00 0.00 5813.00 41984.00 22.71 164.00
8.00 174.87 3.65 0.15 4.13 0.02 100.00
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s
avgrq-sz avgqu-sz await r_await w_await svctm %util
sdg 1378.00 156.00 1672.00 8.00 18.20 0.69
23.03 0.15 0.09 0.08 2.00 0.08 12.80
sdd 1370.00 169.00 1667.00 9.00 18.15 0.75
23.09 0.13 0.08 0.07 1.78 0.08 12.80
sda 1365.00 169.00 1655.00 9.00 18.09 0.75
23.18 0.14 0.08 0.07 1.33 0.08 13.20
sdf 1377.00 156.00 1672.00 6.00 18.23 0.69
23.09 0.14 0.09 0.08 2.00 0.08 12.80
sde 1374.00 159.00 1657.00 8.00 18.10 0.71
23.13 0.16 0.10 0.09 2.00 0.10 16.40
sdc 1365.00 146.00 1666.00 10.00 18.12 0.75
23.07 0.20 0.12 0.10 3.20 0.10 16.80
sdb 1375.00 137.00 1665.00 10.00 18.16 0.75
23.13 0.23 0.14 0.11 4.00 0.12 19.60
md1 0.00 0.00 21218.00 820.00 126.86 3.20
12.09 0.00 0.00 0.00 0.00 0.00 0.00
drbd2 0.00 0.00 21221.00 820.00 126.88 3.20
12.09 10.17 0.46 0.25 5.98 0.03 67.60
dm-8 0.00 0.00 9984.00 0.00 39.00 0.00
8.00 4.47 0.45 0.45 0.00 0.00 2.80
dm-12 0.00 0.00 1166.00 0.00 48.54 0.00
85.25 0.20 0.17 0.17 0.00 0.09 10.00
dm-17 0.00 0.00 10061.00 819.00 39.30 3.20
8.00 4.38 0.51 0.06 5.99 0.06 63.60
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s
avgrq-sz avgqu-sz await r_await w_await svctm %util
sdg 1472.00 0.00 1681.00 0.00 14.70 0.00
17.90 0.14 0.08 0.08 0.00 0.08 13.60
sdd 1472.00 0.00 1668.00 0.00 14.64 0.00
17.98 0.12 0.07 0.07 0.00 0.07 11.20
sda 1472.00 0.00 1673.00 0.00 14.66 0.00
17.95 0.12 0.07 0.07 0.00 0.07 11.60
sdf 1472.00 0.00 1680.00 0.00 14.69 0.00
17.91 0.13 0.08 0.08 0.00 0.07 12.40
sde 1472.00 0.00 1685.00 0.00 14.71 0.00
17.88 0.12 0.07 0.07 0.00 0.07 11.60
sdc 1478.00 0.00 1687.00 0.00 14.72 0.00
17.87 0.12 0.07 0.07 0.00 0.07 11.20
sdb 1487.00 0.00 1679.00 0.00 14.69 0.00
17.92 0.14 0.08 0.08 0.00 0.08 13.20
md1 0.00 0.00 22182.00 0.00 103.29 0.00
9.54 0.00 0.00 0.00 0.00 0.00 0.00
drbd2 0.00 0.00 22244.00 0.00 103.66 0.00
9.54 5.76 0.26 0.26 0.00 0.03 59.60
dm-8 0.00 0.00 10945.00 0.00 42.75 0.00
8.00 5.74 0.50 0.50 0.00 0.00 4.00
dm-12 0.00 0.00 446.00 0.00 18.51 0.00
84.99 0.07 0.15 0.15 0.00 0.07 3.20
dm-17 0.00 0.00 10836.00 0.00 42.33 0.00
8.00 0.58 0.05 0.05 0.00 0.05 57.60
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s
avgrq-sz avgqu-sz await r_await w_await svctm %util
sdg 1441.00 13.00 1684.00 4.00 17.76 0.06
21.62 0.14 0.08 0.08 1.00 0.08 14.00
sdd 1421.00 32.00 1676.00 9.00 17.65 0.16
21.64 0.15 0.09 0.08 1.33 0.09 14.40
sda 1426.00 28.00 1682.00 5.00 17.69 0.13
21.63 0.13 0.08 0.08 1.60 0.07 12.40
sdf 1429.00 14.00 1671.00 6.00 17.66 0.08
21.66 0.11 0.07 0.07 0.00 0.06 10.80
sde 1442.00 13.00 1686.00 7.00 17.77 0.08
21.59 0.14 0.08 0.08 0.57 0.08 13.20
sdc 1405.00 28.00 1673.00 8.00 17.60 0.14
21.61 0.16 0.10 0.09 1.50 0.09 14.40
sdb 1408.00 18.00 1672.00 6.00 17.64 0.09
21.64 0.16 0.10 0.09 2.67 0.09 15.60
md1 0.00 0.00 21539.00 17.00 123.00 0.55
11.74 0.00 0.00 0.00 0.00 0.00 0.00
drbd2 0.00 0.00 21477.00 17.00 122.64 0.55
11.74 4.61 0.21 0.21 1.18 0.03 68.40
dm-8 0.00 0.00 10176.00 0.00 39.75 0.00
8.00 3.26 0.35 0.35 0.00 0.00 3.20
dm-12 0.00 0.00 1031.00 17.00 42.88 0.55
84.87 0.14 0.13 0.12 1.18 0.08 8.80
dm-17 0.00 0.00 10262.00 0.00 40.09 0.00
8.00 0.64 0.06 0.06 0.00 0.06 64.00
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s
avgrq-sz avgqu-sz await r_await w_await svctm %util
sdg 1472.00 0.00 1643.00 1.00 13.53 0.00
16.85 0.17 0.10 0.10 4.00 0.09 15.60
sdd 1472.00 0.00 1653.00 2.00 13.57 0.00
16.79 0.14 0.08 0.08 0.00 0.08 13.60
sda 1472.00 0.00 1654.00 1.00 13.57 0.00
16.79 0.14 0.08 0.08 0.00 0.07 12.40
sdf 1472.00 0.00 1656.00 1.00 13.58 0.00
16.78 0.11 0.07 0.07 4.00 0.07 11.20
sde 1472.00 0.00 1657.00 1.00 13.58 0.00
16.77 0.12 0.07 0.07 4.00 0.07 11.20
sdc 1472.00 0.00 1662.00 1.00 13.60 0.00
16.75 0.16 0.10 0.09 12.00 0.09 14.80
sdb 1472.00 0.00 1654.00 2.00 13.57 0.00
16.79 0.17 0.10 0.09 10.00 0.10 16.80
md1 0.00 0.00 21882.00 1.00 94.99 0.00
8.89 0.00 0.00 0.00 0.00 0.00 0.00
drbd2 0.00 0.00 21882.00 1.00 94.99 0.00
8.89 6.72 0.31 0.31 0.00 0.03 65.20
dm-8 0.00 0.00 10753.00 0.00 42.00 0.00
8.00 6.02 0.56 0.56 0.00 0.00 4.40
dm-12 0.00 0.00 274.00 1.00 10.47 0.00
78.02 0.10 0.38 0.38 0.00 0.13 3.60
dm-17 0.00 0.00 10849.00 0.00 42.38 0.00
8.00 0.63 0.06 0.06 0.00 0.06 62.80
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s
avgrq-sz avgqu-sz await r_await w_await svctm %util
sdg 1518.00 0.00 1669.00 0.00 12.45 0.00
15.28 0.10 0.06 0.06 0.00 0.06 9.20
sdd 1523.00 0.00 1651.00 0.00 12.40 0.00
15.38 0.13 0.08 0.08 0.00 0.07 12.00
sda 1518.00 0.00 1651.00 0.00 12.38 0.00
15.36 0.15 0.09 0.09 0.00 0.09 14.40
sdf 1528.00 0.00 1669.00 0.00 12.49 0.00
15.32 0.12 0.07 0.07 0.00 0.07 12.00
sde 1517.00 0.00 1655.00 0.00 12.39 0.00
15.34 0.13 0.08 0.08 0.00 0.07 12.40
sdc 1534.00 0.00 1662.00 0.00 12.48 0.00
15.38 0.13 0.08 0.08 0.00 0.08 13.20
sdb 1534.00 0.00 1651.00 0.00 12.44 0.00
15.43 0.13 0.08 0.08 0.00 0.08 12.40
md1 0.00 0.00 22277.00 0.00 87.02 0.00
8.00 0.00 0.00 0.00 0.00 0.00 0.00
drbd2 0.00 0.00 22277.00 0.00 87.02 0.00
8.00 6.06 0.27 0.27 0.00 0.03 68.40
dm-8 0.00 0.00 11137.00 0.00 43.50 0.00
8.00 5.44 0.49 0.49 0.00 0.01 5.60
dm-12 0.00 0.00 1.00 0.00 0.00 0.00
8.00 0.00 0.00 0.00 0.00 0.00 0.00
dm-17 0.00 0.00 11121.00 0.00 43.44 0.00
8.00 0.63 0.06 0.06 0.00 0.06 63.20
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s
avgrq-sz avgqu-sz await r_await w_await svctm %util
sdg 976.00 6175.00 968.00 327.00 8.77 25.27
53.84 0.60 0.47 0.13 1.47 0.35 45.20
sdd 973.00 6130.00 949.00 292.00 8.64 24.95
55.43 0.26 0.21 0.10 0.58 0.17 20.80
sda 979.00 6176.00 952.00 292.00 8.68 25.13
55.65 0.26 0.21 0.11 0.53 0.15 19.20
sdf 978.00 6191.00 958.00 294.00 8.73 25.20
55.49 0.28 0.22 0.11 0.57 0.16 19.60
sde 976.00 6189.00 968.00 330.00 8.79 25.33
53.82 0.67 0.51 0.14 1.61 0.41 52.80
sdc 972.00 6202.00 947.00 292.00 8.69 24.93
55.58 1.43 1.15 0.54 3.10 0.46 56.40
sdb 974.00 6174.00 954.00 293.00 8.70 24.82
55.05 1.19 0.95 0.29 3.10 0.46 57.20
md1 0.00 0.00 12427.00 38133.00 56.70 148.83
8.33 0.00 0.00 0.00 0.00 0.00 0.00
drbd2 0.00 0.00 12424.00 38092.00 56.69 148.80
8.33 159.95 3.14 0.49 4.00 0.02 89.60
dm-8 0.00 0.00 6144.00 0.00 24.00 0.00
8.00 5.21 0.85 0.85 0.00 0.01 6.80
dm-12 0.00 0.00 231.00 0.00 9.06 0.00
80.31 0.15 0.64 0.64 0.00 0.36 8.40
dm-17 0.00 0.00 6030.00 38093.00 23.55 148.80
8.00 157.57 3.48 0.13 4.00 0.02 99.20
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s
avgrq-sz avgqu-sz await r_await w_await svctm %util
sdg 914.00 6081.00 921.00 324.00 8.36 24.89
54.70 0.58 0.46 0.17 1.30 0.35 43.20
sdd 925.00 6079.00 914.00 286.00 8.38 24.75
56.53 0.24 0.20 0.06 0.63 0.16 18.80
sda 940.00 6048.00 921.00 289.00 8.48 24.62
56.03 0.31 0.26 0.16 0.58 0.20 23.60
sdf 907.00 6032.00 920.00 287.00 8.31 24.56
55.77 0.28 0.23 0.11 0.60 0.17 20.00
sde 919.00 6074.00 930.00 324.00 8.41 24.88
54.36 0.99 0.79 0.38 1.96 0.43 54.40
sdc 909.00 6077.00 926.00 289.00 8.36 25.05
56.32 1.51 1.25 0.63 3.24 0.48 58.40
sdb 905.00 6083.00 914.00 287.00 8.29 25.06
56.88 1.09 0.92 0.26 3.02 0.43 52.00
md1 0.00 0.00 11831.00 37443.00 54.55 146.14
8.34 0.00 0.00 0.00 0.00 0.00 0.00
drbd2 0.00 0.00 11834.00 37407.00 54.56 146.12
8.35 179.72 3.71 0.64 4.68 0.02 89.60
dm-8 0.00 0.00 5760.00 0.00 22.50 0.00
8.00 6.43 1.12 1.12 0.00 0.02 10.00
dm-12 0.00 0.00 228.00 0.00 9.23 0.00
82.88 0.31 1.37 1.37 0.00 0.70 16.00
dm-17 0.00 0.00 5847.00 37406.00 22.84 146.12
8.00 172.03 4.07 0.15 4.68 0.02 96.40
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s
avgrq-sz avgqu-sz await r_await w_await svctm %util
sdg 1439.00 44.00 1562.00 21.00 12.91 0.25
17.02 0.20 0.13 0.12 0.95 0.11 18.00
sdd 1434.00 64.00 1571.00 15.00 12.87 0.30
17.00 0.17 0.11 0.10 1.07 0.11 16.80
sda 1447.00 66.00 1568.00 23.00 12.89 0.34
17.03 0.13 0.08 0.07 0.70 0.08 12.80
sdf 1464.00 66.00 1561.00 22.00 12.95 0.35
17.20 0.11 0.07 0.06 0.73 0.07 10.80
sde 1454.00 78.00 1567.00 30.00 12.93 0.41
17.10 0.18 0.11 0.09 0.93 0.11 16.80
sdc 1478.00 91.00 1575.00 32.00 13.05 0.47
17.23 0.19 0.12 0.09 1.50 0.09 14.40
sdb 1464.00 102.00 1581.00 27.00 13.12 0.50
17.35 0.20 0.12 0.08 2.67 0.11 17.60
md1 0.00 0.00 20847.00 45.00 90.04 1.66
8.99 0.00 0.00 0.00 0.00 0.00 0.00
drbd2 0.00 0.00 20845.00 44.00 90.04 1.66
8.99 6.39 0.31 0.30 2.00 0.03 71.60
dm-8 0.00 0.00 10369.00 0.00 40.50 0.00
8.00 5.66 0.55 0.55 0.00 0.01 5.20
dm-12 0.00 0.00 231.00 44.00 9.51 1.66
83.20 0.10 0.36 0.05 2.00 0.17 4.80
dm-17 0.00 0.00 10237.00 0.00 39.99 0.00
8.00 0.68 0.07 0.07 0.00 0.07 67.60
Another 15 seconds of 0.00 wMB/s on dm-17
In fact, the peak value is 180.00 and the minimum is 0.00, with a total
of 44 seconds of 0.00 and 16seconds over 100.00 and 16 seconds between 0
and 100.
Here is a look at top -b -d 0.5 -n 60|grep ^\%Cpu
%Cpu0 : 2.1 us, 29.2 sy, 0.0 ni, 4.2 id, 64.6 wa, 0.0 hi, 0.0 si,
0.0 st
%Cpu1 : 1.9 us, 11.5 sy, 0.0 ni, 78.8 id, 7.7 wa, 0.0 hi, 0.0 si,
0.0 st
%Cpu2 : 0.0 us, 12.0 sy, 0.0 ni, 88.0 id, 0.0 wa, 0.0 hi, 0.0 si,
0.0 st
%Cpu3 : 0.0 us, 7.8 sy, 0.0 ni, 90.2 id, 2.0 wa, 0.0 hi, 0.0 si,
0.0 st
%Cpu0 : 0.0 us, 24.4 sy, 0.0 ni, 6.7 id, 66.7 wa, 0.0 hi, 2.2 si,
0.0 st
%Cpu1 : 0.0 us, 13.5 sy, 0.0 ni, 75.0 id, 11.5 wa, 0.0 hi, 0.0 si,
0.0 st
%Cpu2 : 0.0 us, 6.0 sy, 0.0 ni, 94.0 id, 0.0 wa, 0.0 hi, 0.0 si,
0.0 st
%Cpu3 : 0.0 us, 2.1 sy, 0.0 ni, 97.9 id, 0.0 wa, 0.0 hi, 0.0 si,
0.0 st
%Cpu0 : 0.0 us, 25.5 sy, 0.0 ni, 14.9 id, 57.4 wa, 0.0 hi, 2.1 si,
0.0 st
%Cpu1 : 2.0 us, 8.2 sy, 0.0 ni, 75.5 id, 14.3 wa, 0.0 hi, 0.0 si,
0.0 st
%Cpu2 : 0.0 us, 4.1 sy, 0.0 ni, 93.9 id, 2.0 wa, 0.0 hi, 0.0 si,
0.0 st
%Cpu3 : 0.0 us, 9.8 sy, 0.0 ni, 90.2 id, 0.0 wa, 0.0 hi, 0.0 si,
0.0 st
%Cpu0 : 2.2 us, 32.6 sy, 0.0 ni, 4.3 id, 56.5 wa, 0.0 hi, 4.3 si,
0.0 st
%Cpu1 : 2.0 us, 3.9 sy, 0.0 ni, 92.2 id, 2.0 wa, 0.0 hi, 0.0 si,
0.0 st
%Cpu2 : 0.0 us, 7.7 sy, 0.0 ni, 92.3 id, 0.0 wa, 0.0 hi, 0.0 si,
0.0 st
%Cpu3 : 0.0 us, 0.0 sy, 0.0 ni,100.0 id, 0.0 wa, 0.0 hi, 0.0 si,
0.0 st
%Cpu0 : 4.0 us, 42.0 sy, 0.0 ni, 0.0 id, 54.0 wa, 0.0 hi, 0.0 si,
0.0 st
%Cpu1 : 0.0 us, 2.0 sy, 0.0 ni, 98.0 id, 0.0 wa, 0.0 hi, 0.0 si,
0.0 st
%Cpu2 : 0.0 us, 1.9 sy, 0.0 ni, 98.1 id, 0.0 wa, 0.0 hi, 0.0 si,
0.0 st
%Cpu3 : 0.0 us, 0.0 sy, 0.0 ni,100.0 id, 0.0 wa, 0.0 hi, 0.0 si,
0.0 st
%Cpu0 : 2.2 us, 39.1 sy, 0.0 ni, 0.0 id, 58.7 wa, 0.0 hi, 0.0 si,
0.0 st
%Cpu1 : 2.0 us, 0.0 sy, 0.0 ni, 98.0 id, 0.0 wa, 0.0 hi, 0.0 si,
0.0 st
%Cpu2 : 0.0 us, 0.0 sy, 0.0 ni,100.0 id, 0.0 wa, 0.0 hi, 0.0 si,
0.0 st
%Cpu3 : 0.0 us, 2.0 sy, 0.0 ni, 98.0 id, 0.0 wa, 0.0 hi, 0.0 si,
0.0 st
%Cpu0 : 2.2 us, 34.8 sy, 0.0 ni, 4.3 id, 56.5 wa, 0.0 hi, 2.2 si,
0.0 st
%Cpu1 : 0.0 us, 3.8 sy, 0.0 ni, 94.2 id, 1.9 wa, 0.0 hi, 0.0 si,
0.0 st
%Cpu2 : 0.0 us, 3.9 sy, 0.0 ni, 96.1 id, 0.0 wa, 0.0 hi, 0.0 si,
0.0 st
%Cpu3 : 1.9 us, 1.9 sy, 0.0 ni, 96.2 id, 0.0 wa, 0.0 hi, 0.0 si,
0.0 st
Currently, there are no LVM snapshots at all, the raid array is in sync,
operating normally:
md1 : active raid5 sdd1[7] sdb1[11] sdc1[10] sdf1[9] sdg1[5] sde1[8] sda1[6]
2813087616 blocks super 1.2 level 5, 64k chunk, algorithm 2 [7/7]
[UUUUUUU]
mdadm --detail /dev/md1
/dev/md1:
Version : 1.2
Creation Time : Wed Aug 22 00:47:03 2012
Raid Level : raid5
Array Size : 2813087616 (2682.77 GiB 2880.60 GB)
Used Dev Size : 468847936 (447.13 GiB 480.10 GB)
Raid Devices : 7
Total Devices : 7
Persistence : Superblock is persistent
Update Time : Tue Mar 25 23:55:42 2014
State : active
Active Devices : 7
Working Devices : 7
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 64K
Name : san1:1 (local to host san1)
UUID : 707957c0:b7195438:06da5bc4:485d301c
Events : 1713337
Number Major Minor RaidDevice State
7 8 49 0 active sync /dev/sdd1
6 8 1 1 active sync /dev/sda1
8 8 65 2 active sync /dev/sde1
5 8 97 3 active sync /dev/sdg1
9 8 81 4 active sync /dev/sdf1
10 8 33 5 active sync /dev/sdc1
11 8 17 6 active sync /dev/sdb1
Also, the DRBD is disconnected:
2: cs:WFConnection ro:Primary/Unknown ds:UpToDate/DUnknown C r-----
ns:79767379 nr:0 dw:137515806 dr:388623024 al:37206 bm:6688 lo:0
pe:0 ua:0 ap:0 ep:1 wo:f oos:58639192
So, I know dd isn't the ideal performance testing tool or metric, but
I'd really like to know why I can't get more than 40MB/s. There is no
networking, no iscsi, just a fairly simple raid5, drbd, and lvm.
So, am I crazy? What totally retarded thing have I done here?
--
Adam Goryachev Website Managers www.websitemanagers.com.au
next prev parent reply other threads:[~2014-03-25 13:10 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-13 2:49 Growing RAID5 SSD Array Adam Goryachev
2014-03-13 11:58 ` Stan Hoeppner
2014-03-17 5:43 ` Adam Goryachev
2014-03-17 21:43 ` Stan Hoeppner
2014-03-18 1:41 ` Adam Goryachev
2014-03-18 11:22 ` Stan Hoeppner
2014-03-18 23:25 ` Adam Goryachev
2014-03-19 20:45 ` Stan Hoeppner
2014-03-20 2:54 ` Adam Goryachev
2014-03-22 19:39 ` Stan Hoeppner
2014-03-25 13:10 ` Adam Goryachev [this message]
2014-03-25 20:31 ` Stan Hoeppner
2014-04-05 19:25 ` Adam Goryachev
2014-04-08 15:27 ` Stan Hoeppner
2014-04-09 3:57 ` Adam Goryachev
2014-04-10 8:06 ` Stan Hoeppner
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