From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Majed B." Subject: Re: Re-map disk sectors in userspace when rewriting after read errors Date: Fri, 18 Sep 2009 23:13:29 +0300 Message-ID: <70ed7c3e0909181313p10abefe6u72329b6e8932cd2b@mail.gmail.com> References: <87ws3z5iro.fsf@frosties.localdomain> <1253106813.17888.9.camel@localhost> <70ed7c3e0909180117v725982dr5c6a344586ba36eb@mail.gmail.com> <1253273738.9662.636.camel@kiste> <4AB3C6E0.7010908@anonymous.org.uk> <87f94c370909181102y25ee0ba9o833ea2f9c09ff8d7@mail.gmail.com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary=00032555a19623c95b0473dfc5ea Return-path: In-Reply-To: <87f94c370909181102y25ee0ba9o833ea2f9c09ff8d7@mail.gmail.com> Sender: linux-raid-owner@vger.kernel.org To: Linux RAID List-Id: linux-raid.ids --00032555a19623c95b0473dfc5ea Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Greg, You don't really need to use hdparm. You can use dd to overwrite the bad sectors with zeros which forces the disk to remap the sector. As for calculating the new data, a friend of mine wrote me a java program that takes in any number of input files and XORs them, then writes the output to a file. The input files are the sectors' data from other disks. I have attached the program in case any one is interested. Courtesy to Eng. Hisham Farahat who wrote the program "sector xor, or sexor, as I call it" java -jar sexor.jar file1 file2 ... fileN The output file will always be called "out" -- do not include it in the input list. On Fri, Sep 18, 2009 at 9:02 PM, Greg Freemyer wr= ote: > All, > > I keep forgetting to ask, but the subject of this thread makes me > wonder if you guys are familiar with the hdparm features of > "--make-bad-sector", "--read-sector", and "--write-sector". > > I don't know if any of those can be used to force a sector to be > remapped, but I could see a user space process like: > > identify corrupt sector > hdparm --make-bad-sector =C2=A0 (to get it as corrupt as linux knows how)= . > calculate correct value > write new value to sector the normal way (hopefully the drive will > remap the bad sector) > > hdparm --read-sector will do a low level read of the sector, including > the sector header and checksum as I understand it. =C2=A0I'm not sure all > that gets back to userspace. > > hdparm --write-sector will force a sector to be rewritten. =C2=A0I don't > believe it is meant to ever cause a sector remap. =C2=A0Of course you nev= er > know what a disk drive is going to do for any given command. > > Mark Lord is of course the expert on all things hdparm. > > Greg > -- > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at =C2=A0http://vger.kernel.org/majordomo-info.html > --=20 Majed B. --00032555a19623c95b0473dfc5ea Content-Type: application/java-archive; name="sexor.jar" Content-Disposition: attachment; filename="sexor.jar" Content-Transfer-Encoding: base64 X-Attachment-Id: f_fzrd93wo0 UEsDBBQACAAIANlsMjsAAAAAAAAAAAAAAAAUAAQATUVUQS1JTkYvTUFOSUZFU1QuTUb+ygAA803M y0xLLS7RDUstKs7Mz7NSMNQz4OXyTczM03XOSSwutlIITq3IL+Ll4uUCAFBLBwilHGUtLgAAACwA AABQSwMECgAAAAAAwWgyO/Uz20DoAAAA6AAAAAoAAAAuY2xhc3NwYXRoPD94bWwgdmVyc2lvbj0i MS4wIiBlbmNvZGluZz0iVVRGLTgiPz4NCjxjbGFzc3BhdGg+DQoJPGNsYXNzcGF0aGVudHJ5IGtp bmQ9InNyYyIgcGF0aD0ic3JjIi8+DQoJPGNsYXNzcGF0aGVudHJ5IGtpbmQ9ImNvbiIgcGF0aD0i b3JnLmVjbGlwc2UuamR0LmxhdW5jaGluZy5KUkVfQ09OVEFJTkVSIi8+DQoJPGNsYXNzcGF0aGVu 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