Matthias wrote: > After replacing one drive with a bigger drive another drive in the raid > raises an error: > lost page write due to I/O error on dm-1 That reads to me like a hardware disk failure. > After rebooting I can -re-add the drive into the array but after 30 minutes > the raid stops with the same error. Install the S.M.A.R.T. tools. You can read about smart here: http://en.wikipedia.org/wiki/S.M.A.R.T. And install the tools this way: sudo apt-get install smartmontools Here are some example uses: $ sudo smartctl -I /dev/sda SMART support is: Available - device has SMART capability. SMART support is: Enabled If smart is available but disabled then you would need to enable it before making use of it. $ sudo smartctl -s on /dev/sda Then check the disk health status. $ sudo smartctl -H /dev/sda SMART overall-health self-assessment test result: PASSED You can manually run a selftest like this: $ sudo smartctl -t short /dev/sda Then wait a couple of minutes for the test to complete and then observe the results. $ sudo smartctl -l selftest /dev/sda If the short test reports okay I would then run a long test. short - [SCSI] runs the "Background short" self-test. long - [ATA] runs SMART Extended Self Test (tens of minutes). This is a longer and more thorough version of the Short Self Test described above. Note that this command can be given dur- ing normal system operation (unless run in captive mode - see the '-C' option below). I recommend setting up automatic regular selftests by configuring smartmontools to run them regularly. Hopefully your disk is okay and not reporting physical errors. But if so then that would explain your problem. And reinforce why you are using raid. Because your system is still running. Bob
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