Issue Have you ever felt that write to a partition has become relatively slower than previously?? Ever wondered how to debug such kind of issues Then this post is for you. Useful commands are lsblk iotop iostat dd Check the partition type using df -Th Debugging dd command is used to emulate disk write to the device. In this example we are just writing the stream of /dev/zero of size 1G to our partition. A key observation was that the real time was way higher than sys and user time combined. for i in {0..60}; do time dd if=/dev/zero of=/data/1GB.bin bs=1G count=1; done output real 31m27s user 00m00s sys 00m806s dd process was observed to be in uninterruptible sleep (D) state using the following command for the most part of the time as the above command was under execution. iotop (run as a root user) showed that there was no disk activity on any of the disks on the device. Few takeaways: /dev/zero produces a continuous st...
Comments
Post a Comment