Troubleshooting HDD errors

I found some error messages in a server today regarding ATA channel reset. To identify if it was a HDD I ran: # ls -l /sys/block/sd* | sed -e 's@.*-> \.\..*/ata@/ata@' -e 's@/host@ @' -e 's@/target.*/@ @' Turns out, it belongs to a different channel and not the ones that have the HDDs connected, will have to pay a visit to the Datacenter to check.