10e53c2beSJerome MarchandWhat: /proc/diskstats 20e53c2beSJerome MarchandDate: February 2008 30e53c2beSJerome MarchandContact: Jerome Marchand <jmarchan@redhat.com> 40e53c2beSJerome MarchandDescription: 50e53c2beSJerome Marchand The /proc/diskstats file displays the I/O statistics 60e53c2beSJerome Marchand of block devices. Each line contains the following 14 70e53c2beSJerome Marchand fields: 8bdca3c87SMichael Callahan 90e53c2beSJerome Marchand 1 - major number 100e53c2beSJerome Marchand 2 - minor mumber 110e53c2beSJerome Marchand 3 - device name 12af901ca1SAndré Goddard Rosa 4 - reads completed successfully 130e53c2beSJerome Marchand 5 - reads merged 140e53c2beSJerome Marchand 6 - sectors read 150e53c2beSJerome Marchand 7 - time spent reading (ms) 160e53c2beSJerome Marchand 8 - writes completed 170e53c2beSJerome Marchand 9 - writes merged 180e53c2beSJerome Marchand 10 - sectors written 190e53c2beSJerome Marchand 11 - time spent writing (ms) 200e53c2beSJerome Marchand 12 - I/Os currently in progress 210e53c2beSJerome Marchand 13 - time spent doing I/Os (ms) 220e53c2beSJerome Marchand 14 - weighted time spent doing I/Os (ms) 23bdca3c87SMichael Callahan 24bdca3c87SMichael Callahan Kernel 4.18+ appends four more fields for discard 25bdca3c87SMichael Callahan tracking putting the total at 18: 26bdca3c87SMichael Callahan 27bdca3c87SMichael Callahan 15 - discards completed successfully 28bdca3c87SMichael Callahan 16 - discards merged 29bdca3c87SMichael Callahan 17 - sectors discarded 30bdca3c87SMichael Callahan 18 - time spent discarding 31bdca3c87SMichael Callahan 324f4cfa6cSMauro Carvalho Chehab For more details refer to Documentation/admin-guide/iostats.rst 33