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Raid 1 Read Error Corrected

The latter should then stop trying to read the nasty sector, automatically mark it as bad (not to be used anymore), and remap it on a nice sane sector. So the big question (to all) becomes this: is this a hard drive issue, or a motherboard / SATA controller issue? It's not impossible, however, since the drives a= re } >> > likely from the same batch. } >> > } >> >> As you are seeing these message across all Also this can be run if smartctl -a /dev/sdb | grep -i reallocated 5 Reallocated_Sector_Ct 0x0033 100 100 005 Pre-fail Always – 0 196 Reallocated_Event_Count 0x0032 100 100 000 Old_age Always http://lebloggeek.com/raid-1/raid-5-degraded.html

Well there is no magic one like force or skip , or perhaps exist but I didn't find the exact solution. The raid didn't build and get a failed . smartd - I have smartd running "short" tests every night and long tests every second week. check doesn't keep a record of problems, just a count.

If you delete a file, it's deleted from both drives. Privacy policy About Linux Raid Wiki Disclaimers I appreciate it. When md/raid6 tries to read from a device and gets a read error, it try to read from other other devices.

Some Ubuntu Questions and Answers: Is it possible to auto-mount sshfs Recent Comments jack: Hi Thomas Jansson, can I know how to set gkrellm layout just like it's shown in the Draw an hourglass Can I use a single stored procedure to operate on different schemas based on the executing user Do I need to turn off camera before switching auto-focus on/off? The modern hard drive can relocate some sector if they are bad, but to do that a write on that sector must occur . Thoughts on how to go about diagnosing the issue further to determine what is going on would be greatly appreciated.

So long as all the errors were on a single drive, a 'validation' check often offered by RAID controllers would pick it up and be able to reconstruct the original data Print some JSON Is it safe for a CR2032 coin cell to be in an oven? Fantasy Story about Phantom Tollbooth/Where the Wild Things Are kids as Adults What is the practical duration of Prestidigitation? Removing the faulty disk A important part of a RAID setup is the ability to cope with the failure of a faulty disk.

Is there a standard I2C/SM bus protocol for laptop battery packs Can unconnected inputs make an IC get warm? So it can be useful on a read-only array. However, this time /dev/sdb2 failed to correctly read 8 sectors. Andrew Morgan: Just used this to replace a faulty disk in my RAID too.

  • Since the array in question holds the root mount point do I need to move them to another machine to analyze them?
  • See, for example, Wikipedia's section on error handling on modern hard drives.
  • No. 6.
  • How can I determine if it is *likely* a hardware problem? (I imagine it's probably impossible to tell if it's HW until it's too late) (c) are these errors expected in
  • The issue is repeated later on.
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  • Perfect.

Would it be ok to eat rice using spoon in front of Westerners? However, the odds of this are perhaps not as high as you may think. In either case you should make a backup as soon as possible. Reply Thomas Jansson says: September 4, 2016 at 16:14 Scary stuff, but go to hear that you could use my post. 🙂 Reply Andrew Morgan says: September 2, 2016 at 22:18

asked 2 years ago viewed 2185 times active 2 years ago Blog Stack Overflow Podcast #92 - The Guerilla Guide to Interviewing Related 7How to raid-mirror existing root partition?2What changed between his comment is here Bit rot creeps in, and then one drive fails. Cooking inside a hotel room DXA model mapping issue Unfortunately, you died Why was Toph put in a wooden cell in the Fire Nation city in Season 3 Episode 7? linux redhat software-raid mdadm raid1 share|improve this question edited Dec 30 '09 at 16:50 asked Dec 28 '09 at 22:58 fredrick 12515 add a comment| 2 Answers 2 active oldest votes

It's not impossible to add additional error-detection and error-correction, but that is not typically done at the level of the RAID controller. The md.txt doc mentions for "check" that "a repair may also happen for some raid levels." Which RAID levels, and in what cases? NeilBrown > (c) are these errors expected in a RAID array that is heavily used? > (d) what kind of errors should I see regarding "read errors" that > *would* indicate this contact form The motivation is to start checking some blocks overnight, and to pick-up where I left off the next night...

It's worth pointing out that hard drives do have built-in data redundancy to partly mitigate bit rot. So I started to think it there are no more . The dmesg look something like this [7646674.321121] end_request: I/O error, dev sda, sector 1251467520 [7646674.321148] raid1: sda3: rescheduling sector 1242024160 [7646691.820040] end_request: I/O error, dev sda, sector 1251467520 [7646691.841995] raid1:md2: read

How can I determine if it is *likely* a hardware problem? (I imagine it's probably impossible to tell if it's HW until it's too late) (c) are these errors expected in

You are correct on all counts. This is called ERC (or TLER, CCTL). GENERALLY SPEAKING, WHAT IS THE DIFFERENCE BETWEEN THE "CHECK" AND "REPAIR" COMMANDS? tgalati4May 24th, 2015, 03:08 AMYou can install smartmontools to get the drives' serial number: sudo apt-get install smartmontools sudo smartctl -a /dev/sda sudo smartctl -a /dev/sdb sudo smartctl -a /dev/sdc Powered

share|improve this answer answered Feb 12 '12 at 23:00 sblair 10.4k63060 RAID5 should actually be able to detect the sort of problem described. What does "Game of the Year" actually mean? Thanks for that. http://lebloggeek.com/raid-1/raid-movie.html TheFuMay 23rd, 2015, 01:52 PMUnplug 1 of them?

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