RAID-1 and bad sectors?
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From: J. Clarke on 5 Jan 2006 09:58 Arno Wagner wrote: > In comp.sys.ibm.pc.hardware.storage void(a)no.spam.com wrote: >> Rod, > >> I will email Samsung, and I will also try to run the DFT in the next >> few days. > >> Also, can you tell me if reading or writing to a bad sector will >> always show up in the SMART data? So if I don't see any mention of >> errors in the SMART data, then I'll know that no data has been read >> or written to a bad sector? > > It will not. I had one disk (specifically Maxtor) decrease > the SMART defect count to zero after it had defects. Now, it > may have re-tested these sectors, but in my view defects are > defects and should not goo away. Which "defect count"? That's not one of the standard SMART fields. You should be looking 0x0033, which is usually the reallocated sectors count. Also, SMART counters are not always intuitive--some of them start at a high value and count down. Could be that if it's showing zero it means that all the available sectors have been remapped. Also, some drives reset the counters after the first 8 hours or so of operation. You also need to obtain the manufacturer's docs--the SMART fields are not completely standardized. There's a great deal of useful information at <http://smartmontools.sourceforge.net/>--follow the "useful references" link and you'll find actual SMART reports on failing drives, some of them Maxtor. > > What might work is the error log. The disk keeps the last 4 > (or so) errors with description. > > Best just run a long SMART self-test and see whether it > completes without error. > > Arno -- --John to email, dial "usenet" and validate (was jclarke at eye bee em dot net)
From: Rod Speed on 5 Jan 2006 14:30 void(a)no.spam.com wrote > I will email Samsung, and I will also try to run the DFT in the next few days. > Also, can you tell me if reading or writing to a bad > sector will always show up in the SMART data? Well, the bad sector should be visible in the SMART data, either as a reallocated sector if its been reallocated, or as a pending if it hasnt yet been reallocated for various reasons or uncorrectable. The attempt to read or write that sector should show up in the log that you can see with smartctl. > So if I don't see any mention of errors in the SMART data, then > I'll know that no data has been read or written to a bad sector? Thats complicated by what has happened with the offline tests. Those will show the bad sectors that have been discovered by the offline tests and will end up in the SMART data.
From: void on 5 Jan 2006 21:22 On Fri, 6 Jan 2006 06:30:27 +1100, "Rod Speed" <rod_speed(a)yahoo.com> wrote: >> So if I don't see any mention of errors in the SMART data, then >> I'll know that no data has been read or written to a bad sector? > >Thats complicated by what has happened with the offline tests. >Those will show the bad sectors that have been discovered by >the offline tests and will end up in the SMART data. Yeah, since the offline test will read the entire disk, then if there are any bad sectors, they'll definitely show up in the SMART data after running a test. The only time a bad sector won't show up in the SMART data is if data has never been read from or written to it. I hope I got that right.
From: Rod Speed on 5 Jan 2006 22:49 void(a)no.spam.com wrote > Rod Speed <rod_speed(a)yahoo.com> wrote >> void(a)no.spam.com wrote >>> So if I don't see any mention of errors in the SMART data, then >>> I'll know that no data has been read or written to a bad sector? >> Thats complicated by what has happened with the offline tests. >> Those will show the bad sectors that have been discovered by >> the offline tests and will end up in the SMART data. > Yeah, since the offline test will read the entire disk, > then if there are any bad sectors, they'll definitely > show up in the SMART data after running a test. With a decent SMART implementation, anyway. Arno claims to have seen a Maxtor drive reset the bad sector count. I havent seen that myself, but then I dont use Maxtor drives much. > The only time a bad sector won't show up in the SMART > data is if data has never been read from or written to it. > I hope I got that right. That's correct.
From: void on 10 Jan 2006 17:09
I emailed Samsung the output from HUTIL and smartctl, and here is their unhelpful response: Dear Sir/Madam: If this drive was purchased separately from your computer system, within the last three years, it is under warranty. If your drive was preinstalled in a branded computer, such as a Dell or HP, please contact that company, as they assume all responsibility for service and support. Otherwise, please use the attached form to request an RMA from our factory service center. As an alternative to fax, you can also submit the form by email to svcfsc(a)sea.samsung.com. This will set up warranty replacement of the drive with refurbished stock that carries the remainder of your original warranty. You may also wish to visit our factory service center web site at http://www.fesvc.com and sign up for a username and password. Once this is done, you can make any needed RMA requests online. |