[GTER] Performance hd

[Alfredo Junior]

Glaucio Rocha - 001hosting.com.br wrote:
> Pessoal,
>
> Comparando com o SCSI o SAS chegou para reinar:
>
> DELL POWEREDGE 1950 - HD SAS DE 300 GB RAID 1 - 4 GB RAM
>
> hdparm -Tt
> /dev/sda:
>  Timing cached reads:   10592 MB in  2.00 seconds = 5302.11 MB/sec
>  Timing buffered disk reads:  256 MB in  3.01 seconds =  85.01 MB/sec
>   

HP - HD SCSI 72GB RAID 1 - 3 GB RAM

Controladora:
0000:04:03.0 RAID bus controller: Compaq Computer Corporation Smart 
Array 64xx (rev 01)

#> cat /proc/driver/cciss/cciss0
cciss0: HP Smart Array 6i Controller
Board ID: 0xZZZZZZZZZZ
Firmware Version: 2.32
IRQ: 22
Logical drives: 1
Current Q depth: 0
Current # commands on controller: 0
Max Q depth since init: 170
Max # commands on controller since init: 384
Max SG entries since init: 31
Sequential access devices: 0

cciss/c0d0:       72.82GB       RAID 1(1+0)

#> hdparm -tT /dev/cciss/c0d0p4
/dev/cciss/c0d0p4:
 Timing buffer-cache reads:   3668 MB in  2.00 seconds = 1833.36 MB/sec
 Timing buffered disk reads:  486 MB in  3.01 seconds = 161.38 MB/sec

#> hdparm -tT /dev/cciss/c0d0p4
/dev/cciss/c0d0p4:
 Timing buffer-cache reads:   2628 MB in  2.00 seconds = 1312.89 MB/sec
 Timing buffered disk reads:  500 MB in  3.01 seconds = 166.08 MB/sec

Comparando este ítem:

Timing buffered disk reads

A SAS:  256 MB in  3.01 seconds =  85.01 MB/sec
A SCSI: 500 MB in  3.01 seconds = 166.08 MB/sec

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