On 9/14/2012 11:29 AM, Kelly Clowers wrote: > On Thu, Sep 13, 2012 at 4:45 PM, Stan Hoeppner <s...@hardwarefreak.com> wrote: >> On 9/13/2012 5:20 AM, Veljko wrote: >>> On Tue, Sep 11, 2012 at 08:34:51AM -0500, Stan Hoeppner wrote: >>>> One of the big reasons (other than cost) that I mentioned this card is >>>> that Adaptec tends to be more forgiving with non RAID specific >>>> (ERC/TLER) drives, and lists your Seagate 3TB drives as compatible. LSI >>>> and other controllers will not work with these drives due to lack of >>>> RAID specific ERC/TLER. >>> >>> Those are really valuable informations. I wasn't aware that not all >>> drives works with RAID cards. >> >> Consumer hard drives will not work with most RAID cards. As a general >> rule, RAID cards require enterprise SATA drives or SAS drives. > > They don't work with real hardware RAID? How weird! Why is that?
Surely you're pulling my leg Kelly, and already know the answer. If not, the answer is the ERC/TLER timeout period. Nearly all hardware RAID controllers expect a drive to respond to a command within 10 seconds or less. If the drive must perform error recovery on a sector or group of sectors it must do so within this time limit. If the drive takes longer than this period the controller will flag it as bad and kick it out of the array. The assumption here is that a drive taking that long to respond has a problem and should be replaced. Most consumer drives have no such timeout limit. They will churn forever attempting to recover an unreadable sector. Thus routine errors on consumer drives often get them kicked instantly when used on read RAID controllers. -- Stan -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/5053a6c6.8060...@hardwarefreak.com
