If there's no specific utility from the manufacturer for Linux, you might want to take a look at "sdparm" On Wed, Sep 9, 2009 at 11:21 AM, Simon Jackson<sjackson@xxxxxxxxxxx> wrote: > This sounds an interesting proposition for RAID 1 setups that I am using. In a couple of cases I have seen unresponsive drives retrying on a bad block seemingly to lock up my system, or at least slow response significantly. > > In my case I am using Seagate and Hitachi drives. A look at Wikipedia indicates that on Hitachi there is something called "Command Completion Time Limit" and on Seagate "Error Recovery Control". > > Please can anyone tell me how I would go about setting timeout values on these types of drive. Are there utility programs to do this or a Linux > command. > > Thanks Simon. > > -----Original Message----- > From: linux-raid-owner@xxxxxxxxxxxxxxx [mailto:linux-raid-owner@xxxxxxxxxxxxxxx] On Behalf Of Maurice Hilarius > Sent: 09 September 2009 02:34 > To: Mario 'BitKoenig' Holbe > Cc: linux-raid@xxxxxxxxxxxxxxx; iusty@xxxxxxxxx > Subject: Re: mdadm and TLER (Time Limited Error Recovery) > > Iustin Pop wrote: >> .. >>> Anyways, clarification... >>> The only reason for TLER (Time Limited Error Recovery) is to behave >>> "friendly" toward RAID controllers that timeout disks. >>> In fact, md does not timeout disks as many Hardware RAID controllers do. >>> So, from md's point of view, TLER is useless, i.e. it has no benefit. >>> >> >> I'm sorry but I disagree here. *Especially* because md is used over >> normal SATA controllers most of the time, TLER is beneficial because the >> drive doesn't go catatonic for minutes at a time trying to recover a bad >> sector, which would (because md doesn't timeout disks) cause md to hung >> up the whole device. TLER will allow md to see the error quickly and >> attempt to rewrite (read) or retry/fail the disk (write) for a bad the >> sector. >> >> Just my understanding of the md stack. >> >> regards, >> iustin >> >> > I agree. > Before WD implemented this we would see cases quite often where a > perfectly good drive would get "kicked out" > of a RAID as frequently or even more often, than on a hardware RAID. > TLER management seems to have eliminated most of these cases. > > > > -- > Regards, Maurice > -- > 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 > -- Majed B. -- 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
