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Questions tagged [io]

IO (or I/O) is an abbreviation for input/output, most commonly referring to disk input/output.

IO (or I/O) is an abbreviation for input/output, most commonly referring to disk input/output.

401 questions
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monitoring disk i/o via wmi

I'm using WMI to monitor Windows Server 2003 and Windows Server 2008 hosts. I got all the info I wanted but the disk I/O performance. I've tried quering the "Win32_PerfFormattedData_PerfDisk_LogicalDisk" for the "AvgDiskQueueLength", but I always…
Jorge
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How to track a single Xen VM's I/O utilization

What is a good way to monitor I/O individually for Xen Virtual Machines (not Dom0)?
kolrie
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Monitorig ZFS io with Zabbix

I need to monitor per-zpool IO stats (number of reads, number of writes, size of reads, size of writes) with Zabbix. Is there a script for that? kstat provides only agregate data (all zpools summed together) -- unix:0:vopstats_zfs:nread,…
Juraj Ziegler
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2 answers

Monitor Disk I/O Using DD

I've bee looking into the possibility that my server is experiencing a lot of iowait issues. I've found a lot online about running the dd command. I am unable to run this conv: [root@vps ~]# dd if=/dev/zero of=/tmp/test bs=64k count=16k…
noidea
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Possible disk IO issue

I've been trying to really figure out what my IOPS are on my DB server array and see if it's just too much. The array is four 72.6gb 15k rpm drives in RAID 5. To calculate IOPS for RAID 5 the following formula is used: (reads + (4 * Writes)) /…
Tim Meers
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5 answers

Linus/ext4/nvme crashes during high io

During mvn compilation, I have random crashes. The problem seems related to high IO and in kern.log, I can see things like: kernel: [158430.895045] nvme nvme1: controller is down; will reset: CSTS=0xffffffff, PCI_STATUS=0x10 kernel: [158430.951331]…
Brimstedt
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High CPU Load and High I/O wait time : Mysql process

i am fairly new to the role and the technology. we have a Network server that receives the telemetry data from sensors and temeletry data is stored in MYSQL dabatase. we have a front end portal which we use for device management and queries the…
cjonnala
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Which process writes/reads the most from disk over time?

I want to know which process writes/reads the most from disk over time, I mean that I will start the monitoring process than after X time I will be able to see what was the process that used the disk the most. Is there anything like that? I'm using…
XtoR
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What does iodepth in fio tests really mean? Is it the queue depth?

I understand queue depth which is the number of outstanding I/O requests that the storage controller can handle (https://www.tomshardware.com/reviews/ssd-gaming-performance,2991-3.html) i.e., this is the limitation on a storage controller which…
GP92
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contradictory results dd and iostat, ext4 and xfs, on EBS volumes

I'm seeing what seems to me to be contradictory results when looking at disk performance with dd versus iostat on two hosts (EC2 instances with an EBS drive). The hosts are identical except that one uses EXT4-formatted ebs and the other…
Michael Martinez
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Does ionice has any effect on NFS client?

I need to remove millions of directories recursively on a NFS share and to avoid any performance issues, I ran the command with: ionice -c 3 -t find /dir -type f -exec rm {}; which will delete all the files and the leftover empty directories, I can…
GP92
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KVM/QUEMU guest slow disk performance

I'm really confused of QEMU/KVM behavior. I have a server - about 100GB RAM, 2 CPU - 6 core + HT, and three HDDs - one for root, and two for BTRFS-mirror for virtual machines (HGST HDN724030ALE640 if it's matter). OS - Debian 9.1, QEMU (disk type -…
slavka
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Linux software RAID becomes unresponsive after removing a disk from server

I am running a CentOS 7 machine (standard kernel: 3.10.0-327.36.3.el7.x86_64) with a software RAID-10 over 16x 1 TB SSDs (to be more precise, there are two RAID arrays on the disks; one of the arrays is providing the host's swap partition). Last…
user3693367
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Improving I/O rates for EBS snapshot backed volumes

I'm working with a system that takes a set of 42 rotating daily EBS snapshots of each of its numerous (40) volumes for disaster recovery purposes. EBS volumes are aggregated into a RAID volume. A set of consistent snapshots are taken by freezing the…
Craig Ringer
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How can I determine which files have high I/O in Windows?

In trying to reduce the storage bottleneck on a Windows server (2008 R2) I need to find the files that have the highest I/O over a long period of time (aka 'hot' files) so I can move those to SSD storage. How can I track the I/O of the file system…
Jens Ehrich
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