Linux 서버이하 FC-SAN, iSCSI, NAS등 별도의 Storage를 구성하여 이용할 경우 Storage Vendor에서 제공하는 성능 모니터 Tool등을 이용하여 Storage의 전체처리 IOPS나 Disk 응답 Latency 정보등을 얻을 수 있다.
만약 Storage 에서 특정 LUN 및 Volume 단위의 성능정보를 얻을 수 없다면, Linux OS 에서 제공하는 아래와 같은 방법으로 Disk의 Read/Write 속도를 측정 가능하다.
1. 특정 Volume에 대한 Disk Read Ahead Cache Size 확인
|
[root@TEST_DB1-NEW ~]#
[root@TEST_DB1-NEW ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/xvda2 20G 3.1G 16G 17% /
/dev/xvda6 20G 3.6G 15G 20% /usr
/dev/xvda5 20G 3.8G 15G 21% /var
/dev/xvda3 30G 16G 13G 57% /home
/dev/xvda1 996M 41M 904M 5% /boot
tmpfs 31G 0 31G 0% /dev/shm
/dev/xvdb1 99G 63G 31G 68% /APP
/dev/dm-0 788G 540G 208G 73% /Data
[root@TEST_DB1-NEW ~]#
[root@TEST_DB1-NEW ~]#
[root@TEST_DB1-NEW ~]# blockdev --report /dev/dm-0
RO RA SSZ BSZ StartSec Size Device
rw 256 512 4096 0 1677721600 /dev/dm-0
[root@TEST_DB1-NEW ~]#
[root@TEST_DB1-NEW ~]#
[root@TEST_DB1-NEW ~]# |
- 확인된 Disk Cache 설정값(RA * SSZ / 1024) : 128KB
- 계산식 : (256 * 512) / 1024 = 128 KB
- Hitachi AMS2500 Storage Controler 제공하는 Disk Cache 16GB 내에서 조정 예시
- 128MB 기준 변경 : (128 * 1024 * 1024) / 512 = 262144
blockdev --setra 262144 /dev/dm-0
2. Disk Write 성능측정
|
[root@TEST_DB1 ~]#
[root@TEST_DB1 ~]# dd if=/dev/zero of=/Data/load_test.img bs=512k count=2000 oflag=direct; sync; 2000+0 records in
2000+0 records out
1048576000 bytes (1.0 GB) copied, 1.23153 seconds, 851 MB/s
[root@TEST_DB1 ~]#
[root@TEST_DB1 ~]#
[root@TEST_DB1 ~]# dd if=/dev/zero of=/Data/load_test.img bs=512k count=2000 oflag=direct; sync; 2000+0 records in
2000+0 records out
1048576000 bytes (1.0 GB) copied, 1.2783 seconds, 820 MB/s
[root@TEST_DB1 ~]#
[root@TEST_DB1 ~]#
[root@TEST_DB1 ~]# dd if=/dev/zero of=/Data/load_test.img bs=512k count=2000 oflag=direct; sync; 2000+0 records in
2000+0 records out
1048576000 bytes (1.0 GB) copied, 1.22622 seconds, 855 MB/s
[root@TEST_DB1 ~]# |
3. 순차 읽기(Sequential Access Read) 성능 측정
|
[root@TEST_DB1 ~]#
[root@TEST_DB1 ~]# dd if=/Data/load_test.img of=/dev/null
2048000+0 records in
2048000+0 records out
1048576000 bytes (1.0 GB) copied, 3.89702 seconds, 269 MB/s
[root@TEST_DB1 ~]#
[root@TEST_DB1 ~]#
[root@TEST_DB1 ~]# dd if=/Data/load_test.img of=/dev/null
2048000+0 records in
2048000+0 records out
1048576000 bytes (1.0 GB) copied, 4.31475 seconds, 243 MB/s
[root@TEST_DB1 ~]#
[root@TEST_DB1 ~]#
[root@TEST_DB1 ~]# dd if=/Data/load_test.img of=/dev/null
2048000+0 records in
2048000+0 records out
1048576000 bytes (1.0 GB) copied, 3.82925 seconds, 274 MB/s
[root@TEST_DB1 ~]#
[root@TEST_DB1 ~]# |
4. Random Access Read 성능 측정
|
[root@TEST_DB1 ~]#
[root@TEST_DB1 ~]# hdparm -t /dev/dm-0
/dev/dm-0:
Timing buffered disk reads: 318 MB in 3.00 seconds = 105.97 MB/sec
[root@TEST_DB1 ~]#
[root@TEST_DB1 ~]# hdparm -t /dev/dm-0
/dev/dm-0:
Timing buffered disk reads: 332 MB in 3.00 seconds = 110.59 MB/sec
[root@TEST_DB1 ~]#
[root@TEST_DB1 ~]#
[root@TEST_DB1 ~]# hdparm -t /dev/dm-0
/dev/dm-0:
Timing buffered disk reads: 336 MB in 3.02 seconds = 111.25 MB/sec
[root@TEST_DB1 ~]# |
