Questions tagged [io]

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

Filter by
Sorted by
Tagged with
0
votes
0answers
10 views

Interpreting /proc/diskstats - IO time magnitude higher than sum of read and write times

This question is an extension of the existing: Interpreting read, write and total IO time in /proc/diskstats Original documentation of the diskstats I found: https://www.kernel.org/doc/html/latest/...
0
votes
0answers
15 views

Getting high read await in Zabbix monitoring, is this a common behavior for RAID5 disk array?

We are running a Oracle 11.2 DB on Redhat 6.8, and disk array is configured as RAID5, which is using a Lenovo 730i RAID adapter. I checked RAID policy and found that "Read Ahead Always" and &...
1
vote
0answers
44 views

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, ...
0
votes
1answer
60 views

disk read io very high, but no process perform io read

We have experienced a very strange problem. The load of the server machine is very high due to high disk read io. But the processes running on this server do not perform any disk read operation. We ...
0
votes
0answers
12 views

ionice: “none: prio 4” vs “realtime: prio 4”

If run a process using ionice -c realtime processname I see: # ionice -p 4472 realtime: prio 4 On the other hand, neighbor process has: # ionice -p 4004 none: prio 4 The question: Is realtime 4 ...
2
votes
1answer
53 views

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/...
0
votes
1answer
31 views

It is possible that a process can not link a file, but I can with sudo for the same user?

I am working with Dovecot 2.3.4.1 and EncFS (encfs version 1.9.5) encrypted mailboxes on Debian 10 (no SELinux) Basic setup is: EncFS mounted with encfs --public /var/encrypted-mail /var/decrypted-...
2
votes
0answers
42 views

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 ...
0
votes
1answer
41 views

ZFS raidz3 on proxmox having IO issues

I'm running Proxmox 6.2-11 with 256GB ECC RAM and the following raidz3 pool: pool: rpool state: ONLINE scan: scrub repaired 0B in 0 days 15:25:14 with 0 errors on Sun Jan 10 15:49:29 2021 config: ...
0
votes
0answers
24 views

High %wa from top command while runing PyTorch

Everything was fine yesterday, but I noticed high dataloading time this morning. How do I go about trying to figure out how to fix this? top: process state: iotop: iostat:
0
votes
1answer
29 views

Does add more memory RAM decrease I/O wait?

My server is Ubuntu KVM and has 2 cores, 4GB RAM, and I use HDD, at moment I can't swap HDD to SSD. I found this answear (https://unix.serverfault.tech/a/463819/351968) saying that adding more memory ...
-2
votes
1answer
30 views

SSD I/O slows down system

My HDD was getting full, so I added a new SSD and tried moving files to it. For some reason, this bogs down the whole system to the point where it's not usable. This never happened with HDDs when ...
0
votes
1answer
233 views

Looking for a NBD C/S for windows (Network Block Device) [closed]

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 ...
0
votes
1answer
34 views

Is RAID 6 a good choice regarding performance on server used for computation?

We are operating a server for doing computations with large data sets (100GB - 5TB) for a small group of researchers (10-20 people). At the moment we are running 4x8TB spinning drives in a RAID 6 ...
0
votes
0answers
62 views

Interpreting /proc/diskstats values to identify potential I/O bottleneck

I'm investigating some semi-regular unit test timeouts on our test runners, with test cleanup (close temp database, remove temp directory) taking well over 10s. I can reproduce the issue when using a ...

15 30 50 per page
1
2 3 4 5
26