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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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How can I get a list of Programs doing Disk IO?

I have a server (running CentOS 5) and I need to figure out which programs (MySQL, Apache, etc) are doing the most Disk I/O? Is there a command that will allow me to calculate an average over time?
Steven Williams
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Exchange 2003 I/O Troubles

We have some internal processes that send email to our Exchange 2003 system (on Win2K3 R2 32bit). Recently they have been intermittently failing with various errors -- boiled down they report "Exchange refused the connection". We use XWall as our…
Matt Rogish
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High Disk I/O rate. How to investigate

One of my servers is getting very high Disk I/Os. The problem is that the disk I/Os are constantly increasing. The server just have simple LAMP configuration and there shouldnt be any disk operation…
Sparsh Gupta
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How to view formatted iotop log file in terminal with a cat

So I have logged the history of Disk usage with a iotop > iohis.log How can I view the file so it is formatted nicely and I can actually find the issue. I thought I could use the cat but it just fast worwards the whole text. =(. Could you give me…
simple
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Can I set noatime for my XEN guest OS partition? Will it work?

I have a VPS in cloud environment based on XEN Virtualization platform. /etc/fstab looks like that: LABEL=PRGMRDISK1 / ext3 errors=remount-ro 0 0 As far as I know IO can pretty easily become a bottleneck if some other VPS…
user45286
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Estimate daily network IO between 2 servers

I have 2 servers : a database server (SQL Server 2008, called server A) and an application server (called server B) which send SQL queries to the first one. They are actually in the same LAN, but we planned to separate them in 2 different…
JYL
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What types of IO does SQL trace display?

Are they physical or logical IOs? If they're logical, is there a way to break it out similar to STATISTICS IO for a production server?
rjdevereux
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ZFS I/O Error, Kernel Panic during import

I'm running a raidz1-0 (RAID5) setup with 4 data 2TB SSDs. During midnight, somehow 2 of my data disks experience some I/O error (from /var/log/messages). When I investigated in the morning, the zpool status shows the following : state:…
Jealous_Donut_7128
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I have a new server but IO Speed is terrible based on FIO results

I ordered a new server because I have to move to higher performance server. However, this new server is totally awful. I tried to get the benchmark by using fio here is the result. [root@s206716 ~]# fio --filename=/var/lib/mysql/fio.tmp --size=1m…
James Hartford
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Is it possible to use the IO priority from a KVM guest on the host?

When I use KVM with libvirt and virtio block devices, does it propagate IO priority in some way? If the guest starts a process with ioidle priority, I want it to run only if the host is also in ioidle state. Is there an easy way to propagate the…
allo
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Does interface bandwidth and/or interface type (SATA/NVME) affect IO and Random 4KB RW performance

TLDR: The advertised IOPS of NVME drives is leaps above any SATA SSDs, but how much of this is due to limitations of the: Interface (SATA/NVME) Interface Bandwidth (PCIE Gen 4, Gen 3, SATA 3, SATA 2) Or Memory Controller Quality? Premise: I've got…
James Hopwood
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High iowait, swap nearly always fully in use

I'm often experiencing slowness on a large server that is used by several users simultaneously, with many CPUs (72) and a decent amount of ram (125gb). Granted, the server runs a lot of stuff so gets a high load, but it pretty much never happens…
dreamer
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Does my swapping server with ~80GB available RAM need even more?

I'm administering a Debian Linux x86_64 server with 125GB RAM, a 10GB swap partition and a swappiness value of 60. A free -gw output prints: total used free shared buffers cache available Mem: …
eheu
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Centos stream 9 local console login input shown as squares

I'm after a fresh centos stream 9 install as minimal install, with only English keyboard and only root user. After installing, I rebooted and got to the login screen. Trying to type "root" for the username, all I'm getting is squares instead of the…
Harry Zalessky
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High I/O wait in apache tomcat server

Facing high I/O wait in apache tomcat server when the load increases. Suspecting disk I/O is less when tomcat is running however. disk IO seems drops drastically when tomcat is running along with the load. Other resources(CPU,RAM) are under…
Sandesh Bailur
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