On Fri, 2008-12-05 at 18:52 -0500, Justin Piszcz wrote: > > On Sat, 6 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. > > > > About this, shouldnt it be possible to find the exact time which the > > linux raid system waits until it auto kicks out the drive? > > > > > >> > >> 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. > > > > On further thought, might this not suggest that the linux raid system > > waits indefinetly for I/O error, before kicking out? > It times out after 1-2 minutes. I have been dealing with this for a very long > time, another 'symptom' is short smart tests taking forever when the disk is in > a soon-to-be failing state. Do you know if this is actually caused by the disk's error recovery timing out in 1-2 minutes, or the linux raid system? > > > > If that is indeed the case, then if the use of the raid isnt > > time-critical, then maybe its a good thing to have tler enabled, just in > > case the disk is able to fix stuff? > With TLER enabled the drive is kicked out immediately. The purpose of TLER is > that of HW raid where it can alert the controller about it and the controller > handles it. > > -- > 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
