후지쯔 RX200 S8은 LSI 컨트롤러를 쓰는데

ssd 2개를 연결해서 만든 raid 1의 성능이 너무 나쁘게 나옵니다.

config의 문제는 아닌 것 같은데, 원인이 뭘까요?

6개의 sas를 raid 10으로 걸었더니 435MB/s가 나왔습니다.

WriteBack, ReadAhead, strip size : 64kb

[root@kcolo122-199 ~]# sync && dd if=/dev/zero of=/dd_test bs=4k count=1000000 && sync
1000000+0 records in
1000000+0 records out
4096000000 bytes (4.1 GB) copied, 9.41727 s, 435 MB/s

2개의 micron ssd (500GB)를 1로 걸었더니 38MB/s가 나왔습니다.

WriteBack, ReadAhead, strip size : 64kb (WriteThrough로 바꿔도 성능 개선은 미미하구요)

[root@kcolo122-199 ~]# sync && dd if=/dev/zero of=/data/dd_test bs=4k count=1000000 && sync    
1000000+0 records in
1000000+0 records out
4096000000 bytes (4.1 GB) copied, 102.542 s, 39.9 MB/s

ssd volume의 config

Adapter 0 -- Virtual Drive Information:
Virtual Drive: 0 (Target Id: 0)
Name                :
RAID Level          : Primary-1, Secondary-0, RAID Level Qualifier-0
Size                : 476.437 GB
Sector Size         : 512
Mirror Data         : 476.437 GB
State               : Optimal
Strip Size          : 64 KB
Number Of Drives    : 2
Span Depth          : 1
Default Cache Policy: WriteThrough, ReadAheadNone, Direct, No Write Cache if Bad BBU
Current Cache Policy: WriteThrough, ReadAheadNone, Direct, No Write Cache if Bad BBU
Default Access Policy: Read/Write
Current Access Policy: Read/Write
Disk Cache Policy   : Disabled
Encryption Type     : None
Bad Blocks Exist: No
PI type: No PI

Is VD Cached: No