DeadLamer
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Здравствуйте, помогите разобраться с проблемой - очень низкая скорость записи/чтения на диски.
конфиг:
Код: root@mx2:~> uname -a
FreeBSD 6.2-RELEASE-p9 FreeBSD 6.2-RELEASE-p9 #3: |
dmesg
Код: root@mx2:~> mount
/dev/ar0s1a on / (ufs, local)
devfs on /dev (devfs, local)
/dev/ar0s1e on /tmp (ufs, local, soft-updates)
/dev/ar0s1f on /usr (ufs, local, soft-updates)
/dev/ar0s1d on /var (ufs, local, soft-updates)
/dev/ar0s1g on /usr/home (ufs, local, soft-updates)
/dev/ad0s1d on /u/ad0 (ufs, local)
devfs on /var/named/dev (devfs, local) |
Код: root@mx2:/usr/home/diez> atacontrol list
ATA channel 0:
Master: ad0 <WDC WD2500JB-00GVA0/08.02D08> ATA/ATAPI revision 6
Slave: no device present
ATA channel 1:
Master: no device present
Slave: no device present
ATA channel 2:
Master: ad4 <ST3802110A/3.AAJ> ATA/ATAPI revision 7
Slave: no device present
ATA channel 3:
Master: no device present
Slave: ad7 <SAMSUNG SV6003H/QQ100-12> ATA/ATAPI revision 6
|
Вот что выдает по тестам :
Код: root@mx2:~> diskinfo -ctv ar0
ar0
512 # sectorsize
60000000000 # mediasize in bytes (56G)
117187500 # mediasize in sectors
7294 # Cylinders according to firmware.
255 # Heads according to firmware.
63 # Sectors according to firmware.
I/O command overhead:
time to read 10MB block 1.993881 sec = 0.097 msec/sector
time to read 20480 sectors 96.562379 sec = 4.715 msec/sector
calculated command overhead = 4.618 msec/sector
Seek times:
Full stroke: 250 iter in 2.295744 sec = 9.183 msec
Half stroke: 250 iter in 3.133692 sec = 12.535 msec
Quarter stroke: 500 iter in 4.506984 sec = 9.014 msec
Short forward: 400 iter in 3.645145 sec = 9.113 msec
Short backward: 400 iter in 4.194780 sec = 10.487 msec
Seq outer: 2048 iter in 8.804519 sec = 4.299 msec
Seq inner: 2048 iter in 8.342073 sec = 4.073 msec
Transfer rates:
outside: 102400 kbytes in 8.985351 sec = 11396 kbytes/sec
middle: 102400 kbytes in 8.634593 sec = 11859 kbytes/sec
inside: 102400 kbytes in 9.601395 sec = 10665 kbytes/sec
root@mx2:~> diskinfo -ctv ad0
ad0
512 # sectorsize
250059350016 # mediasize in bytes (233G)
488397168 # mediasize in sectors
7752336 # Cylinders according to firmware.
1 # Heads according to firmware.
63 # Sectors according to firmware.
I/O command overhead:
time to read 10MB block 1.442247 sec = 0.070 msec/sector
time to read 20480 sectors 138.643173 sec = 6.770 msec/sector
calculated command overhead = 6.699 msec/sector
Seek times:
Full stroke: 250 iter in 7.346665 sec = 29.387 msec
Half stroke: 250 iter in 5.098060 sec = 20.392 msec
Quarter stroke: 500 iter in 9.358831 sec = 18.718 msec
Short forward: 400 iter in 4.257812 sec = 10.645 msec
Short backward: 400 iter in 4.663155 sec = 11.658 msec
Seq outer: 2048 iter in 12.885937 sec = 6.292 msec
Seq inner: 2048 iter in 11.611683 sec = 5.670 msec
Transfer rates:
outside: 102400 kbytes in 12.511676 sec = 8184 kbytes/sec
middle: 102400 kbytes in 10.214857 sec = 10025 kbytes/sec
inside: 102400 kbytes in 8.921412 sec = 11478 kbytes/sec
запись ar0:/usr/bin/time -h dd if=/dev/zero of=testfile bs=4k count=26214
26214+0 records in
26214+0 records out
107372544 bytes transferred in 179.705255 secs (597493 bytes/sec)
3m1,21s real 0,33s user 26,35s sys
чтение ar0: /usr/bin/time -h dd if=testfile of=/dev/null bs=4k count=26214
26214+0 records in
26214+0 records out
107372544 bytes transferred in 56.485784 secs (1900877 bytes/sec)
56,60s real 0,32s user 9,03s sys
запись ad0:/usr/bin/time -h dd if=/dev/zero of=testfile bs=4k count=26214
26214+0 records in
26214+0 records out
107372544 bytes transferred in 187.508678 secs (572627 bytes/sec)
3m10,82s real 0,34s user 27,22s sys
чтение ad0: /usr/bin/time -h dd if=testfile of=/dev/null bs=4k count=26214
26214+0 records in
26214+0 records out
107372544 bytes transferred in 47.072251 secs (2281016 bytes/sec)
47,21s real 0,27s user 7,68s sys
|
Не могу понять в чем причина, если бы в Рейде, то тогда бы небыло такого с ad0 который висит на матери. |
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