RAID-1 rychlostni rozdil mezi 2.2.19 a 2.4.x

[David Haring]

vojta na pharocom.net (Robert Vojta) writes:

> No, bohuzel to tak je i podle vysledku bonnie++, jadro z distribuce RedHat
> 6.2 (updates - 2.2.19-6.2.7) dava o vice jak 50% horsi vysledky nez jadra
> rady 2.4.x (zkousel jsem jich vice, vetsinou Alanovi a jedno z distribuce).
> Patram dal, treba vypatram ...

nekde bude neco spatne, mate ide nebo scsi? ja kdyz zkusim hdparm na RAID1 
ze dvou scsi disku (radic s chipsetem SYMBIOS 53C1010) na cistem jadre 2.2.19 
pouze s opatchovanym ovladacem raidu, tak to vypada tak jak ma:

cat /proc/mdstat 
Personalities : [linear] [raid0] [raid1] [raid5] 
read_ahead 1024 sectors
md0 : active raid1 sdb1[1] sda1[0] 263040 blocks [2/2] [UU]

hdparm -tT /dev/sda

/dev/sda:
 Timing buffer-cache reads:   128 MB in  0.67 seconds =191.04 MB/sec
 Timing buffered disk reads:  64 MB in  1.65 seconds = 38.79 MB/sec

hdparm -tT /dev/sdb 

/dev/sdb:
 Timing buffer-cache reads:   128 MB in  0.73 seconds =175.34 MB/sec
 Timing buffered disk reads:  64 MB in  1.62 seconds = 39.51 MB/sec
[root na bbstats /root]# hdparm -tT /dev/md0

/dev/md0:
 Timing buffer-cache reads:   128 MB in  0.71 seconds =180.28 MB/sec
 Timing buffered disk reads:  64 MB in  1.68 seconds = 38.10 MB/sec

zdravi David Haring