Hi Kelly, Am Samstag, 15. September 2012 schrieb Kelly Clowers: > On Fri, Sep 14, 2012 at 2:51 PM, Stan Hoeppner <s...@hardwarefreak.com> wrote: > > 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. > > 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.
Read the stuff that was linked from some other article link posted here. Especially: What makes a hard drive enterprise class? Posted on 05-11-2010 23:19:18 UTC | Updated on 05-11-2010 23:43:48 UTC Section: /hardware/disks/ | Permanent Link http://www.pantz.org/hardware/disks/what_makes_a_hard_drive_enterprise_class.html But also Everything You Know About Disks Is Wrong by ROBIN HARRIS on TUESDAY, 20 FEBRUARY, 2007 Update II: NetApp has responded. I’m hoping other vendors will as well. http://storagemojo.com/2007/02/20/everything-you-know-about-disks-is-wrong/ Open Letter to Seagate, Hitachi GST, EMC, HP, NetApp, IBM and Sun by ROBIN HARRIS on THURSDAY, 22 FEBRUARY, 2007 http://storagemojo.com/2007/02/22/open-letter-to-seagate-hitachi-gst-emc-hp-netapp-ibm-and-sun/ Google’s Disk Failure Experience by ROBIN HARRIS on MONDAY, 19 FEBRUARY, 2007 http://storagemojo.com/2007/02/19/googles-disk-failure-experience/ is quite intesting. So enterprise class drives have this configurable error correction timeout, but that said, if you leave traditional RAID setups you may still very well get away with using customer drives. Like Google did. Now all that from Storagemojo is 2007 stuff. Dunno how much is changed meanwhile. Ciao, -- Martin 'Helios' Steigerwald - http://www.Lichtvoll.de GPG: 03B0 0D6C 0040 0710 4AFA B82F 991B EAAC A599 84C7 -- 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/201209161443.11148.mar...@lichtvoll.de
