作者: Jason@YIU_SHUN 時間: 2008-10-16 17:24 標題: ASK FOR HELP about LSI 8708EM2
Yesterday 8708EM2 arrive my home .......
so that i use my 3 x Seagate 7200.10 250 GB set up a RAID 5
Therefore , run HD TACH , the speed compare with LSI 8308ELP ( same RAID 5 with same HDD mentioned b4 , also same read write policy , therefore , 8308 use 64k strip size , 8708EM2 i set 128k strip size ) make a such different =_=
Read write policy : 2 card same
IO : Cached IO
READ POLICY : ADAPTIVE READ ahead
Acess Policy : Read - Write
Write policy : Write thuru
Strip Size : ( both card use RAID 5 )
8308 SET 64K
8708 SET 128K
HD TACH result :
Burst Speed : 8308 usually 35x mb sth but 8708 's result is 805 mb
Random access time : 8308 only 14.x ns but 8708 over 20ns
Transfer rate 8308 average 160 mb to 180 mb sth but 8708 only 86 mb
作者: Dull 時間: 2008-10-16 18:50
原帖由 Jason@YIU_SHUN 於 2008-10-16 17:24 發表
Yesterday 8708EM2 arrive my home .......
so that i use my 3 x Seagate 7200.10 250 GB set up a RAID 5
Therefore , run HD TACH , the speed compare with LSI 8308ELP ( same RAID 5 with same HDD mentione ...
recreate array? Full Init?
作者: Jason@YIU_SHUN 時間: 2008-10-16 20:51
原帖由 Dull 於 2008-10-16 18:50 發表
recreate array? Full Init?
JUST I HV BACK UP MY DATA B4 , SO I BREAK THE OLD RAID 5 FROM 8308 and create a new RAID 5 at 8708EM2
but i change the strip size from 64k ( 8308 setting ) to now 128k ( 8708em2 )
作者: Dull 時間: 2008-10-16 23:26
原帖由 Jason@YIU_SHUN 於 2008-10-16 20:51 發表
JUST I HV BACK UP MY DATA B4 , SO I BREAK THE OLD RAID 5 FROM 8308 and create a new RAID 5 at 8708EM2
but i change the strip size from 64k ( 8308 setting ) to now 128k ( 8708em2 )
so you run the test right after you have created the array?
作者: Jason@YIU_SHUN 時間: 2008-10-16 23:32
原帖由 Dull 於 2008-10-16 23:26 發表
so you run the test right after you have created the array?
yup , after install all software
will it be any improvement after run consistency check ?
[ 本帖最後由 Jason@YIU_SHUN 於 2008-10-16 23:34 編輯 ]
作者: Dull 時間: 2008-10-16 23:34
原帖由 Jason@YIU_SHUN 於 2008-10-16 23:32 發表
yup , after install all software
you could try to re-run the test now....
作者: Jason@YIU_SHUN 時間: 2008-10-17 00:02
原帖由 Dull 於 2008-10-16 23:34 發表
you could try to re-run the test now....
here is the result from HD TUNE 3.0
8708 EM2 + 3 X Seagate 7200.10 ( 160 gb 單碟 ) @ RAID 5
個人認為除爆發率外 , 一切也比 8308 差 ....... 但 DULL 兄認為 the result resonable 嗎 ?
[ 本帖最後由 Jason@YIU_SHUN 於 2008-10-17 00:05 編輯 ]
作者: Kavin 時間: 2008-10-17 21:56
Write policy : Write thuru 是會比較慢
作者: Jason@YIU_SHUN 時間: 2008-10-18 01:07
原帖由 Kavin 於 2008-10-17 21:56 發表
Write policy : Write thuru 是會比較慢
Wrtite Back Cache require BBU