messages from dmesg -- (HP ProLiant DL380 G5)

[Tzu-Hua Wang]

Hi:
Thank you for your response.
I had tried to configure the first SAS HD as RAID 0 before. The RAID 0
SAS HD was also
recognized as SCSI-0 device.

I think the problem is not on the size of RAID 5 HD.

Thanks


2007/5/17, Olivier Nicole <on at cs.ait.ac.th>:
>
> Hi,
>
> > *I can setup FreeBSD 6.2R successfully and everything is OK. *
> > *However, I found that there is an amazing message in the dmesg:*
> >
> > *ciss0: <HP Smart Array P400> port 0x4000-0x40ff mem
> > 0xfde00000-0xfdefffff,0xfddf
> > 0000-0xfddf0fff irq 18 at device 0.0 on pci6
> > ciss0: [GIANT-LOCKED]*
> >
> > *--->**Smart Array P400 is activated by ciss0 successfully*
> >
> > *da0 at ciss0 bus 0 target 0 lun 0
> > da0: <COMPAQ RAID 5  VOLUME OK> Fixed Direct Access SCSI-0 device
> > da0: 135.168MB/s transfers
> > da0: 419946MB (860051248 512 byte sectors: 255H 32S/T 65535C)*
>
> Just a wild guess, but if you set-up your disks to be organised into
> RAID 5 (that is one big disk) it sounds logic that all you can see is
> one big disk.
>
> As for the speed, RAID 5 is not optimized for speed but for
> reliability while preserving a low ratio of parity vs. data disk.
>
> If you are interested with more speed, you may have to select another
> RAID agregation (this morning I found
> http://www.acnc.com/04_01_00.html that shows good comparison for every
> RAID config).
>
> Best regards,
>
> Olivier
>