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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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NFS IO priority on ZFS/Solaris

I've got a Nexenta/ZFS NAS that I'm using as an NFS backing store for a small VMware vSphere farm. At the moment I have 9x1TB disks all mirrored (last disk is configured as a write log device). The disk performance is pretty good for my needs over…
growse
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Determine what's causing high disk I/O

I have a problem with my VPS and disk I/O. My server is running nginx + PHP-FPM + APC. The database is located on another dedicated VPS. I have several WordPress MU sites living on the web server. The average I/O rate is 6k block/second. I'm trying…
Mem
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VMWare Esxi Looking for Bottlenecks

I have a VMWare ESxi box, 22GB ram, Dual Quad Core Xeon, 2 Sas drives + Write caching raid controller etc. Anyways, have about 30 small XP VM's running on it and starting to get some very slow boot times and other performance issues. I THINK its I/O…
nextgenneo
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Does a read on a NFS file system slow performance?

If a NFS client reads a file, does any network traffic happen? or is it just writes (by any node) that result in network traffic? In particular, I'm interested in whether doing a file_exists() call in a PHP script will be more expensive if the…
Tom
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1 answer

Weekly RAID check affecting my system - any way to mitigate?

I recently got my webhost (Hetzner) to add a paid of 16TB SATA drives to my webserver. Currently using 2.5TB of them. They're RAID 1 mirrored. I also have two 4TB nVME drives with 700GB currently on them, also RAID 1 mirrored. Every week CentOS…
Codemonkey
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Dmesg is full of I/O errors on Ubuntu 18.04 VM, physical disks and host are fine

I have an Ubuntu 18.04 virtual machine on a Windows Server 2016 host (Dell PowerEdge R530, Intel Xeon E5-2620 @ 2.1GHz, 96GB RAM), running in VirtualBox 6.1.10. The host system has 2x2TB HDDs in RAID 1 via a PERC H730 Mini controller. The VM runs an…
Marcell Bernát
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kvm virtualization, slow io in windows guest (with virtio drivers) on ubuntu host and HP 360 Server with P440 RAID controller

Problem: Very slow IO in Windows Guest vs Host Hardware: HP 360 G9, 2 x 10 cores Xeon CPU, 128GB Ram, 4 x 4TB SAS HDD, Raid 10, P440 Controller (with 2GB cache and battery) Host: Ubuntu 20.04 Server, kvm virtualization, everything stock…
Enovator
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About IOPS of a RAID5 disk array without cache

we are using a 530-8i RAID adapter,which is none-cache supported, on a Lenovo ThinkSystem SR590 server.And we have 4 HDD(600GB/10K RPM/SAS) in the array. I read an article about calculating the disk/disk array IOPS,our disk array should get IOPS…
Jason Yang
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Access disk io data in linux without tools like iotop/iostat to find processes or files with IO

We have regularly high load average. With the help of a zabbix agent, I could narrow it down to be mainly because of cpu iowait (and lastly disk io). I am not allowed to install any additional packages on the server but have root rights and want to…
nox
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Looking for a NBD C/S for windows (Network Block Device)

Where can I find a NBD Server (and also a Client) that I can use in windows 10? (preferably FOSS source code for inspect/change/compile/...) Been looking for a while on the internet and seems that no one overcome this task...
ZEE
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MYSQL vs. InnoDB

mysqltuner output. -------- Storage Engine Statistics ----------------------------------------------------------------- [--] Status: +ARCHIVE +BLACKHOLE +CSV -FEDERATED +InnoDB +MEMORY +MRG_MYISAM +MyISAM +PERFORMANCE_SCHEMA [--] Data in InnoDB…
Nasir Mahmood
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lsass.exe high I/O with SQL Server 2005 sp3

I have a SQL Server 2005 Enterprise Edition on a Windows Server 2003 Enterprise sp2. Lately, I get very high I/O(Reda, Write, Other in Task Manager) from process lsass.exe. When I run sysinternals' process monitor on lsass.exe, I get a lot of…
Saba
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Can't scale write bandwidth on Linux with Intel Optanes

I have a computer with 3 Intel Optane drives and iotop shows that sequential write to each one separately achieves ~2.2 GB/sec. I suppose that simultaneous writing on all three would result in ~6.6 GB/sec. But in reality I got only 3 GB/sec if I try…
John Smith
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Bandwidth and IO issues when running hardware raid and zfs

I've inherited a setup using Linux Ubuntu 14, a megaraid_sas, and ZFS. We're getting some performance problems (never being able to fully utilize the 6GB bandwidth from the raid) and I'm curious if it's related to the ZFS setup - which seems a…
BurningKrome
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Azure Ubuntu VM - Unexpected short IOPS peaks (bursts)

I am not sure if such issue is well-known, I failed to find any straightforward explanations. I have an ordinary VM on Azure of a small size (B1s) running a Ubuntu 18.04 from Canonical. There's a regular LNMP stack on it with a simple wordpress…
Peter Rogov
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