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VM IOPS 설정

글쓴이 : 최고관리자 날짜 : 2014-02-11 (화) 18:08 조회 : 5965

글주소 :

IOPS (Total number of I/O operations per second) : 초당 입출력 횟수

계산방법 IOPS = 1000 / (평균 Read Seek Time + (maximum rotational latency / 2))

http://en.wikipedia.org/wiki/IOPS

IOPS = 1000 (ms/s) / (average read seek time (ms) + (maximum rotational latency (ms) / 2))

maximum rotational latency =

60,000 (ms/min) / rotational speed (rpm)Rotational Speed (rpm) Max Rotational Latency (ms) 4200 14.3 5400 11.1

7200 8.3 10000 6.0 15000 4.0

For example, if we have a 73 GByte, 2.5" Seagate Saviio SAS drive which has a 4.1 ms

average read seek and rotational speed of 10,000 rpm: iops = 1000 / (4.1 + (6.0 / 2)) = 140.8 By comparison,

a 750GByte, 3.5" Seagate Barracuda SATA drive which has a 8.5 ms average read seek and rotational speed of 7,200 rpm:

iops = 1000 / (8.5 + (8.3 / 2)) = 79.0

(분당)회전속도:15000rpm, 평균읽기탐색시간: 3.4ms 제품을 공식에 대입해 보면

디스크당 IOPS : 1000/(3.4 + ((60000/15000)/2)) = 185 입니다.

위 수치와 BMT한 결과를 기반으로 용량산정을 하면 보다 신뢰도 있는 산정이 가능할것 같습니다.

1. QEMU 옵션으로 적용

qemu 1.1 버전이상 옵션 사용가능

[root@localhost]# qemu -help|grep iops

[[,bps=b]|[[,bps_rd=r][,bps_wr=w]]][[,iops=i]|[[,iops_rd=r][,iops_wr=w]]

OPTIONS

[--domain] <string> domain name, id or uuid

[--device] <string> block device

--bps <number> total throughput limits in bytes/s

--bps_rd <number> read throughput limits in bytes/s

--bps_wr <number> write throughput limits in bytes/s

--iops <number> total operation limits in numbers/s

--iops_rd <number> read operation limits in numbers/s

--iops_wr <number> write operation limits in numbers/s

ex) 디스크 옵션내

# qemu ............................ -drive file=/TEST_IMG/HDs/test2/DISK.qcow2,iops=500,if=scsi...........

2. QMP(qemu monitoring protocol)를 통해 관리

ex) VM : 192.168.27.152 접속

[root@192-168-27-18 vnc]# socat - UNIX-CONNECT:/TEST_IMG/HDs/192.168.27.152/vnc/vm02762.monitor

QEMU 1.2.2 monitor - type 'help' for more information

(qemu) info block

info block

scsi0-hd0: removable=0 io-status=ok file=/TEST_IMG/HDs/192.168.27.152/192.168.27.152.raw ro=0 drv=raw encrypted=0 bps=0 bps_rd=0 bps_wr=0 iops=0 iops_rd=0 iops_wr=0

ide1-cd0: removable=1 locked=0 tray-open=0 io-status=ok [not inserted]

floppy0: removable=1 locked=0 tray-open=0 [not inserted]

sd0: removable=1 locked=0 tray-open=0 [not inserted]

(qemu) help

block_job_cancel device -- stop an active background block operation

block_job_set_speed device speed -- set maximum speed for a background block operation

block_passwd block_passwd device password -- set the password of encrypted block devices

block_resize device size -- resize a block image

block_set_io_throttle device bps bps_rd bps_wr iops iops_rd iops_wr -- change I/O throttle limits for a block drive

block_stream device [speed [base]] -- copy data from a backing file into a block device

block_set_io_throttle device bps bps_rd bps_wr iops iops_rd iops_wr -- change I/O throttle limits for a block drive

iops값을 1000으로 설정

(qemu) block_set_io_throttle scsi0-hd0 0 0 0 1000 0 0

block_set_io_throttle scsi0-hd0 0 0 0 1000 0 0

(qemu) info block

scsi0-hd0: removable=0 io-status=ok file=/TEST_IMG/HDs/192.168.27.152/192.168.27.152.raw ro=0 drv=raw encrypted=0 bps=0 bps_rd=0 bps_wr=0 iops=1000 iops_rd=0 iops_wr=0

ide1-cd0: removable=1 locked=0 tray-open=0 io-status=ok [not inserted]

floppy0: removable=1 locked=0 tray-open=0 [not inserted]

sd0: removable=1 locked=0 tray-open=0 [not inserted]

※ 주의사항 QMP 모드에서 나올때는....Ctrl + C 로...

QUIT|q 로 나오게되면...시스템 셧다운됨!!!

초기화

block_set_io_throttle scsi0-hd0 0 0 0 0 0 0

VM iops 설정별 디스크 퍼포먼스체크

iops=0 (No option)

# dd if=/dev/zero of=test.img bs=1M count=1000

1048576000 bytes (1.0 GB) copied, 2.79381 s, 375 MB/s

1048576000 bytes (1.0 GB) copied, 3.05439 s, 343 MB/s

1048576000 bytes (1.0 GB) copied, 3.06847 s, 342 MB/s

1048576000 bytes (1.0 GB) copied, 3.18377 s, 329 MB/s

# hdparm -tT /dev/sda

Timing buffered disk reads: 1124 MB in 3.00 seconds = 374.17 MB/sec

Timing buffered disk reads: 1058 MB in 3.00 seconds = 352.62 MB/sec

Timing buffered disk reads: 976 MB in 3.01 seconds = 324.75 MB/sec

iops=2000

# dd if=/dev/zero of=test.img bs=1M count=1000

1048576000 bytes (1.0 GB) copied, 3.12044 s, 336 MB/s

1048576000 bytes (1.0 GB) copied, 4.91232 s, 213 MB/s

# hdparm -tT /dev/sda

Timing buffered disk reads: 668 MB in 3.12 seconds = 213.84 MB/sec

Timing buffered disk reads: 702 MB in 3.45 seconds = 203.52 MB/sec

Timing buffered disk reads: 700 MB in 3.00 seconds = 233.09 MB/sec

iops=1500

# dd if=/dev/zero of=test.img bs=1M count=1000

1048576000 bytes (1.0 GB) copied, 5.64346 s, 186 MB/s

1048576000 bytes (1.0 GB) copied, 3.98859 s, 263 MB/s

1048576000 bytes (1.0 GB) copied, 3.87936 s, 270 MB/s

1048576000 bytes (1.0 GB) copied, 4.38273 s, 239 MB/s

iops=1000

# dd if=/dev/zero of=test.img bs=1M count=1000

1048576000 bytes (1.0 GB) copied, 7.02586 s, 149 MB/s

1048576000 bytes (1.0 GB) copied, 7.53404 s, 139 MB/s

1048576000 bytes (1.0 GB) copied, 5.73748 s, 183 MB/s

1048576000 bytes (1.0 GB) copied, 8.07439 s, 130 MB/s

1048576000 bytes (1.0 GB) copied, 6.99695 s, 150 MB/s

1048576000 bytes (1.0 GB) copied, 5.25225 s, 200 MB/s

# hdparm -tT /dev/sda

Timing buffered disk reads: 374 MB in 3.01 seconds = 124.43 MB/sec

Timing buffered disk reads: 304 MB in 3.46 seconds = 87.79 MB/sec

Timing buffered disk reads: 294 MB in 3.46 seconds = 84.89 MB/sec

Timing buffered disk reads: 352 MB in 3.00 seconds = 117.33 MB/sec

iops=500

# dd if=/dev/zero of=test.img bs=1M count=1000

1048576000 bytes (1.0 GB) copied, 12.7959 s, 81.9 MB/s

1048576000 bytes (1.0 GB) copied, 12.8743 s, 81.4 MB/s

iops=100

# dd if=/dev/zero of=test.img bs=1M count=1000

1048576000 bytes (1.0 GB) copied, 55.904 s, 18.8 MB/s

1048576000 bytes (1.0 GB) copied, 55.4926 s, 18.9 MB/s

# hdparm -tT /dev/sda

Timing buffered disk reads: 34 MB in 3.21 seconds = 10.58 MB/sec

Timing buffered disk reads: 34 MB in 3.20 seconds = 10.61 MB/sec

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