On Fri, 2008-12-05 at 16:12 -0500, Justin Piszcz wrote: > > On Fri, 5 Dec 2008, Redeeman wrote: > > > On Fri, 2008-12-05 at 16:01 -0500, Justin Piszcz wrote: > >> > >> On Fri, 5 Dec 2008, Redeeman wrote: > >> > >>> Hello.. > >>> > >>> Im going to be building a software raid6 setup with probably 8 disks, > >>> and i've been looking at the wd gp disks, which comes in both standard > >>> and raid edition, with the raid edition being much more expensive. > >>> > >>> I have searched around, and found that it is indeed possible to activate > >>> tler on the "normal" disks, however, the setting has a parameter, more > >>> specifically, how many seconds it should be limited to. Default is 7. > >>> > >>> So i was wondering, what should that be set to, to be optimal for linux > >>> md raid? i havent been able to find any information about this. > >>> > >>> > >>> Thanks. > >>> > >>> > >>> mvh. > >>> Kasper Sandberg > >>> > >>> -- > >>> To unsubscribe from this list: send the line "unsubscribe linux-raid" in > >>> the body of a message to majordomo@xxxxxxxxxxxxxxx > >>> More majordomo info at http://vger.kernel.org/majordomo-info.html > >>> > >> > >> The exact time is a good question. > >> > >> Something I have noticed is when TLER is off, the drives hang up when they > >> hit a bad sector and when TLER is on, the drives is kicked out of the > >> array immediately when it reports a bad sector. > > > > First.. Does this happen with a degree of frequency on these disks? you > > recommend other disks? > The disks I have are velociraptors, I will be reverting back to my old > raptor150s shortly to ensure everything is fine with them before I go > buying new hard drives, etc. It happened every week or two with > velociraptors, bad drives or drives getting kicked out of the array over > and over again. > > > second, when tler is off, it hangs FOREVER? or just until it gives up? > When TLER is off it hangs for 1-2 minutes and then you will see a timeout > in the dmesg/kernel log and it (sometimes) kicks the drive out of the > array, othertimes it 'hard' resets the drive the array is able to continue > operating normally. > > > when tler is on, why does linux not attempt to remap the sector? > See my earlier posts on this question from last week. It would need a > metadata section on each HDD to keep track of the bad sectors before it > writes to the drives, a 3ware card will do this for you-- however, I thought disks had this internally, and could be prompted to do it by writing to the sector? > typically, (having run md/linux) for a number of years is not > super-necessary if you run checks on your disks once a week *AND* you have > good drives that don't have problems. Obviously i intent to replace broken disks as i detect them, but as i understand it, its fairly common case that disks will get bad sectors over time, and remap them internally? > > Justin. > -- > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
