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On Sunday 27 Jul 2014 17:50:49 meino.cramer@×××.de wrote: |
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> I executed the mkswap/dd combo a several times today. Since I have |
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> no logs I repeated again. Here are the results: |
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> |
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> solfire:/home/user>mkswap -L swap -f -c /dev/sda2 |
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> 1 bad page |
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> mkswap: /dev/sda2: warning: wiping old swap signature. |
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> Setting up swapspace version 1, size = 6291448 KiB |
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> LABEL=swap, UUID=e742c0a6-862c-41e9-be4b-698b33c5a236 |
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> solfire:/home/user>dd if=/dev/zero of=/dev/sda2 bs=512 conv=notrunc |
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> dd: error writing ‘/dev/sda2’: Input/output error |
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> 1669369+0 records in |
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> 1669368+0 records out |
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> 854716416 bytes (855 MB) copied, 28.4799 s, 30.0 MB/s |
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> [1] 24047 exit 1 dd if=/dev/zero of=/dev/sda2 bs=512 conv=notrunc |
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> solfire:/home/user> |
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Ahh! This is a different result to what you showed previously, unless you |
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chopped off the output last time. It now shows that it was able to write: |
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1669368 x 512 = 854,716,416 bytes |
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out of a total sda2 partition size of 6.29 GiB. |
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> I am a little anxious about the hdparm command... |
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> For me it is unclear what sector is meant: |
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> |
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> smartclt says: |
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> Num Test_Description Status Remaining LifeTime(hours) |
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> LBA_of_first_error # 1 Selective offline Completed: read failure |
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> 90% 14500 4288352511 |
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> |
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> From a previous posting I learned that "LBA" in this case is the byte |
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> counter. |
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> |
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> The sector is therefore 4288352511/512=8375688 |
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OK, let's not confuse ourselves: LBA counting starts from zero. |
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Therefore, if you subtract the start of the sda2 partition it becomes: |
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4288352511 - 104448 = 4288248063 / 512 = 8,375,484.5 bytes, within the sda2 |
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partition. |
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Unless my maths failed me above, I can't say I understand why dd bailed out |
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after writing 854,716,416 bytes, but smartctl failed earlier than that reading |
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just 8,375,484.5 bytes. Perhaps dd can write further, than what smartctl can |
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read without error, because these are two different mechanisms - but I am |
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guessing wildly. :-) |
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Someone more knowledgeable should chime in here. |
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PS. I'm copying you in just in case this is lost in your Inbox - I had to |
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resend it because I used the wrong From address by mistake and I suspect it |
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never made it to the list. |
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-- |
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Regards, |
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Mick |
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