Re: Storage server
On Fri, Sep 14, 2012 at 2:51 PM, Stan Hoeppner <stan@hardwarefreak.com> wrote:
> On 9/14/2012 11:29 AM, Kelly Clowers wrote:
>> On Thu, Sep 13, 2012 at 4:45 PM, Stan Hoeppner <stan@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.
Why would I be pulling your leg? I have never had opportunity to work
with real raid cards. Nor have I ever heard anyone say that before.
The highest end I have used was I believe a Highpoint card, about
~$150 range, which was fakeRAID (and I believe the drives
attached to that were enterprise drives anyway)
Thanks for the info.
Kelly Clowers
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