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#CHECK HARD DISK HEALTH LINUX COMMAND HOW TO#

The iostat command generates two types of reports, The iostat command generates reports that can be used to change system configuration to better balance the input/output load between physical disks.Īll statistics are reported when the iostat command runs every time. On multiprocessor systems, CPU statistics are calculated system-wide as average among all processors. The iostat command is used to monitor system input/output device loading by observing the time the devices are active in relation to their average transfer rates. Iostat is used to report Central Processing Unit (CPU) statistics and input/output statistics for devices and partitions.

SWAPIN: It shows only the swap usage of each process.

IO: It shows Input/Output utilization of each process, which includes disk and swap.

Iotop is similar to top command utility, for displaying real-time disk activity. These commands are widely used to identify performance issues with storage devices, including local disks or Network File System. To derive and verify the I/O Statistics in detail, iotop and iostat commands will be used predominantly. If the disk I/O operation is high or fluctuating, it could be a possible cause for performance lag for which the disk I/O statistics on the system has to be verified. Server performance degradation might occur due to high disk Read Write I/O operation on the storage devices and partitions, irrespective of CPU and Memory usage on the system. I would recommend to check the wa field in the top command output to figure out, if there is any high I/O Read & Write operations on the storage devices and partitions (such as Hard disk drives, SSD, and Disk partitions). If you do not find any performance issues with respect to resource utilization, especially with CPU and Memory, other fields will be opted to identify the bottlenecks. This is the first level of troubleshooting which is widely performed by Linux Administrator in the real world. In General, top command will be used to view system performance, when an application performance is slow, On this topic.Do you know, what tools are used to troubleshoot or monitor real-time disk I / O performance issues on Linux? You may wish to consult the following resources for additional information If fsck gets interrupted, it will complete any checks in process, but will not attempt to repair any errors it finds. To check and attempt to repair any errors on /dev/sda, use this format: fsck -y /dev/sda This example uses fsck to check all file systems except the root, and will attempt repair using the interactive feature: fsck -AR -y Use the -r option to use the interactive repair option.

The error codes that fsck returns can be understood with the following table from This example checks all file systems ( -A) on /dev/sda: fsck -A /dev/sda Run fsck on the target disk, using the desired options. If the disk is declared in /etc/fstab, change the mount point to none there as well. Use umount to unmount the disk location copied in the

If you are working on a local machine, unmount the disk manually. Unmount the disk from theĬonfiguration Profile. If you are working on a Linode but do not wish to use Rescue Mode, shut down the Linode from the Linode Manager. Use fdisk to view disk locations: fdisk -lĬopy the location of the target disk to use with the fsck command. If you are using Rescue Mode, the disk you want to check should not be listed: df -h Run df to view a list of currently mounted disks. View Mounted Disks and Verify Disk Location fsck should be run only as a user with root permissions. If you’re working on a local machine, consider using the distribution’s recovery mode or a live distribution to avoid working on a mounted disk.

#CHECK HARD DISK HEALTH LINUX COMMAND HOW TO#

Rescue and Rebuild guide for instructions on how to boot your Linode into Rescue Mode. If you are using fsck on a Linode, the easiest and safest way to unmount your disk is to use Rescue Mode. If using the -A option, do not check the root filesystem.Ĭheck only a specific type of filesystem. Use with the -A option to run multiple checks in parallel. Describes what would happen without executing the check itself. Show progress bar (ext2 and ext3 file systems only). Use with caution.įorce fsck to check a file system even if it thinks it’s clean. fsck Options and Arguments OptionĪttempt to fix errors automatically.

You risk corrupting your file system and losing data if you run fsck on an active disk.