RAID-1 and bad sectors?
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From: Eric Gisin on 30 Dec 2005 16:53 In SCSI RAID 1/5, the drives often have bad sector reallocation turned off. The RAID firmware regenerates the data when a bad sector shows up, issues a REASSIGN command, and writes the correct data to a fresh sector. SATA-2 probably can do the same thing, but more likely ATA/SATA RAID just rewrites the correct data and the drive reallocates automagically. <void(a)no.spam.com> wrote in message news:46v9r195r6m540q3b8ef5ikn08kdjn6380(a)4ax.com... > > Anyways, I'm now ready to set up RAID-1 in my system. But I'm wondering if > that bad sector might cause a problem in a RAID-1 setup? I know RAID-1 is > supposed help you if a drive fails. But what if a drive doesn't totally stop > working... what if it only develops a few bad sectors? Can RAID-1 handle > that? (I'll be using the HighPoint 370 controller on my Abit KT7-RAID > motherboard.) Like what would happen if the RAID controller is writing some > data, and one of the drives is OK but the other drive has some bad sectors on > it? Can the RAID controller detect the bad sectors and write the data to good > sectors? Or will it not detect the bad sectors and the 2 drives will be > out-of-sync? >
From: ohaya on 30 Dec 2005 17:19 > I have a Samsung SP1213N 120 GB drive, and on their web site they have a > couple utilities for testing hard drives: SHDIAG, which asks you to do a > low-level format if it detects an error (I guess I don't want to use that > one), and HUTIL. They don't say what HUTIL does if it detects an error, but > they say it writes stuff to the disk while testing. Would it overwrite any of > my data? Hi, I ran HUTIL on my Samsung SP2014N a couple of weeks ago, and when it found what it said was a bad sector, I think that the warning msg said that it would write all zeroes to that sector if I answer 'yes'. I was right in the middle of a bunch of things, so I don't remember exactly, but I know that I decided NOT to tell it 'yes'. Jim
From: void on 31 Dec 2005 00:29 OK, I just ran HUTIL and got some errors (see below). Is there any way to tell if those bad sectors have data on them or if they're not being used? [SELF DIAGNOSTIC (Hutil v2.00)] Model Name : SAMSUNG SP1213N Rom Revision : TL100-24 Drive Size : 114498MB (LBA : 234493056) Start Time : Fri Dec 30 20:57:49 2005 ------------------------------------------------- Test Loop Number : 1/1 ------------------------------------------------- >> READ DMA : Testing... Pass ! >> CHECK M.C. : Testing... Pass ! >> CHECK S.M.A.R.T. : Testing... Pass ! >> SPIN DOWN / UP : Testing... Pass ! >> SIMPLE READ / WRITE : Testing... Pass ! >> SIMPLE SURFACE SCAN : Testing... Pass ! >> WRITE VERIFY : Testing... Pass ! >> AVERAGE SEEK TIME : Testing... Pass ! >> MAXIMUM SEEK TIME : Testing... Pass ! >> RANDOM SURFACE SCAN : Testing... Pass ! >> READ SURFACE SCAN : Testing... C:42962 H:0 S:547 Error : Ecc error C:42962 H:0 S:548 Error : Ecc error C:42962 H:0 S:549 Error : Ecc error C:42962 H:0 S:550 Error : Ecc error C:42962 H:0 S:551 Error : Ecc error C:42962 H:0 S:552 Error : Ecc error C:42962 H:0 S:553 Error : Ecc error C:42962 H:0 S:554 Error : Ecc error C:42962 H:0 S:555 Error : Ecc error C:42962 H:0 S:556 Error : Ecc error C:42962 H:0 S:557 Error : Ecc error C:42962 H:0 S:558 Error : Ecc error C:42962 H:0 S:559 Error : Ecc error C:42962 H:0 S:560 Error : Ecc error C:42962 H:0 S:561 Error : Ecc error C:42962 H:0 S:562 Error : Ecc error C:42962 H:0 S:563 Error : Ecc error C:42962 H:0 S:564 Error : Ecc error C:42962 H:0 S:565 Error : Ecc error C:42962 H:0 S:566 Error : Ecc error C:42962 H:0 S:567 Error : Ecc error C:42962 H:0 S:568 Error : Ecc error C:42962 H:0 S:569 Error : Ecc error C:42962 H:0 S:570 Error : Ecc error C:42962 H:0 S:571 Error : Ecc error C:42962 H:0 S:572 Error : Ecc error C:42962 H:0 S:573 Error : Ecc error C:42962 H:0 S:574 Error : Ecc error C:42962 H:0 S:575 Error : Ecc error C:42962 H:0 S:576 Error : Ecc error C:42962 H:0 S:577 Error : Ecc error C:42962 H:0 S:578 Error : Ecc error Error : This drive has some defects. Scan Elapsed Time : 00:41:49 Error Occured Test Loop Number 1 End Time : Fri Dec 30 21:41:55 2005 Test was completed. =================================================
From: Rod Speed on 31 Dec 2005 00:53 void(a)no.spam.com wrote > OK, I just ran HUTIL and got some errors (see below). > Is there any way to tell if those bad sectors have data > on them or if they're not being used? Hitachi's DFT does tell you what files particular bads are in from memory. Dont currently have a drive with bads to check. Why do you care ? You said you have the data fully backed up. It would be worth checking the drive with some other diag like DFT, those numbers look suspicious, all at the extreme range of the cylinders, all on one head, with increasing sector numbers. I'd personally get the SMART data somehow, by using smartctl when using the knoppix CD and decide whether to RMA the drive if its clearly failing, like it looks like it is. If the data is fully backed up, I'd personally write zeros thru the drive and see if that will get the drive to reallocate the bads, but thats too many bads for my taste, it looks like its dying. > [SELF DIAGNOSTIC (Hutil v2.00)] > Model Name : SAMSUNG SP1213N > Rom Revision : TL100-24 > Drive Size : 114498MB (LBA : 234493056) > Start Time : Fri Dec 30 20:57:49 2005 > > > ------------------------------------------------- > Test Loop Number : 1/1 > ------------------------------------------------- > >> READ DMA : Testing... Pass ! > >> CHECK M.C. : Testing... Pass ! > >> CHECK S.M.A.R.T. : Testing... Pass ! > >> SPIN DOWN / UP : Testing... Pass ! > >> SIMPLE READ / WRITE : Testing... Pass ! > >> SIMPLE SURFACE SCAN : Testing... Pass ! > >> WRITE VERIFY : Testing... Pass ! > >> AVERAGE SEEK TIME : Testing... Pass ! > >> MAXIMUM SEEK TIME : Testing... Pass ! > >> RANDOM SURFACE SCAN : Testing... Pass ! > >> READ SURFACE SCAN : Testing... > C:42962 H:0 S:547 Error : Ecc error > C:42962 H:0 S:548 Error : Ecc error > C:42962 H:0 S:549 Error : Ecc error > C:42962 H:0 S:550 Error : Ecc error > C:42962 H:0 S:551 Error : Ecc error > C:42962 H:0 S:552 Error : Ecc error > C:42962 H:0 S:553 Error : Ecc error > C:42962 H:0 S:554 Error : Ecc error > C:42962 H:0 S:555 Error : Ecc error > C:42962 H:0 S:556 Error : Ecc error > C:42962 H:0 S:557 Error : Ecc error > C:42962 H:0 S:558 Error : Ecc error > C:42962 H:0 S:559 Error : Ecc error > C:42962 H:0 S:560 Error : Ecc error > C:42962 H:0 S:561 Error : Ecc error > C:42962 H:0 S:562 Error : Ecc error > C:42962 H:0 S:563 Error : Ecc error > C:42962 H:0 S:564 Error : Ecc error > C:42962 H:0 S:565 Error : Ecc error > C:42962 H:0 S:566 Error : Ecc error > C:42962 H:0 S:567 Error : Ecc error > C:42962 H:0 S:568 Error : Ecc error > C:42962 H:0 S:569 Error : Ecc error > C:42962 H:0 S:570 Error : Ecc error > C:42962 H:0 S:571 Error : Ecc error > C:42962 H:0 S:572 Error : Ecc error > C:42962 H:0 S:573 Error : Ecc error > C:42962 H:0 S:574 Error : Ecc error > C:42962 H:0 S:575 Error : Ecc error > C:42962 H:0 S:576 Error : Ecc error > C:42962 H:0 S:577 Error : Ecc error > C:42962 H:0 S:578 Error : Ecc error > Error : This drive has some defects. > > Scan Elapsed Time : 00:41:49 > Error Occured Test Loop Number 1 > End Time : Fri Dec 30 21:41:55 2005 > Test was completed. > =================================================
From: void on 31 Dec 2005 01:13
On Sat, 31 Dec 2005 16:53:01 +1100, "Rod Speed" <rod_speed(a)yahoo.com> wrote: >void(a)no.spam.com wrote > >> OK, I just ran HUTIL and got some errors (see below). >> Is there any way to tell if those bad sectors have data >> on them or if they're not being used? > >Hitachi's DFT does tell you what files particular bads are in >from memory. Dont currently have a drive with bads to check. > >Why do you care ? You said you have the data fully backed up. If I can determine that those bad sectors are in unused areas, then I can "ghost" the drive to my new SP1213N, which I also ran HUTIL on and it has no problems. That's much easier than spending time to re-install the OS and re-install and re-configure a ton of applications. I also need to determine how BootItNG deals with writing data to bad sectors, and how Windows deals with reading and writing data from bad sectors. That will help me determine if my data still has integrity or not. >It would be worth checking the drive with some other diag like >DFT, those numbers look suspicious, all at the extreme range >of the cylinders, all on one head, with increasing sector numbers. > >I'd personally get the SMART data somehow, by using >smartctl when using the knoppix CD and decide whether >to RMA the drive if its clearly failing, like it looks like it is. What will the SMART data tell me? >If the data is fully backed up, I'd personally write zeros thru the >drive and see if that will get the drive to reallocate the bads, but >thats too many bads for my taste, it looks like its dying. The reviews on newegg.com for these Samsung drives aren't great. I have no confidence that my new SP1213N won't develop the same problems. |