2012/9/13 Niccolò Belli <darkbasic@xxxxxxxxxxxxxxx> > > Il 13/09/2012 12:34, Robin Hill ha scritto: > >> Has anything actually attempted to read from that part of the array? >> Even if so, it may just have happened to read from the working disk >> anyway. md can only detect the error when it tries to read/write that >> sector of that disk. > > > I forced a read with "dd if=/dev/md0 of=/dev/null bs=524228 count=1 skip=1", I even get errors in syslog! you forced read from a block device (md0) that have a md raid1. check in source of raid1 read balance... it don´t read from all disks, just from 'near/fasters' disks. to read from all, run check like the command echo check > /sys/block/md0/md/sync_action > > > >> Your best bet now is to do an array check: >> echo check> /sys/block/md0/md/sync_action >> >> This will force a read of all disks in the array. This should trigger >> the read error, causing an attempt to re-write the faulty block, in turn >> causing the drive remap the bad sector (assuming the re-write fails). >> This should also be scheduled to run regularly for all arrays in order >> to pick up these sort of issues before they cause major problems during >> a rebuild. > > > /etc/init.d/mdadm should do exactly this kind of things (distro is Debian Squeeze). I have this in cron.d: > 57 0 * * 0 root if [ -x /usr/share/mdadm/checkarray ] && [ $(date +\%d) -le 7 ]; then /usr/share/mdadm/checkarray --cron --all --idle --quiet; fi > > Unfortunately it seems it didn't work :( i´m not a debian expert but, it´s easier to put the bash logic inside a bash file, and call this file from crond, maybe some part of your configuration file of cron failed? > > > Shouldn't a dd if=/dev/md0 be enough to trigger the read error? no > > > Thanks, > Niccolò > > -- > http://www.linuxsystems.it > -- > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- Roberto Spadim Spadim Technology / SPAEmpresarial -- Roberto Spadim Spadim Technology / SPAEmpresarial -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
