Date: Thu, 17 May 2007 18:54:57 +0800 From: "Tzu-Hua Wang" <biogary@gmail.com> To: "Olivier Nicole" <on@cs.ait.ac.th> Cc: freebsd-hardware@freebsd.org Subject: Re: messages from dmesg -- (HP ProLiant DL380 G5) Message-ID: <224a745a0705170354i31fc311bsf502aba056e4c73c@mail.gmail.com> In-Reply-To: <200705170714.l4H7EgvR082226@banyan.cs.ait.ac.th> References: <224a745a0705170006t3a1df03cv5312bf6fc86ee426@mail.gmail.com> <200705170714.l4H7EgvR082226@banyan.cs.ait.ac.th>
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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@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 >
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