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.
Questions tagged [io]
401 questions
0
votes
1 answer
Testing zpool IO performance
To test the write speed of a 2.5 inch SATA3 spinning hard drive (some old Seagate one) installed in my TrueNAS system I used dd if=/dev/zero of=/mnt/pool/test.dd bs=1024 count=1m (found this in several forums and posts across the Internet). This…
Andept
- 73
- 5
0
votes
0 answers
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 "Always WriteBack" are set.
Now we are getting high read…
Jason Yang
- 21
- 2
0
votes
1 answer
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 also noticed that when we execute top command, for…
yifan
- 163
- 1
- 1
- 11
0
votes
1 answer
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-mail -o nonempty…
func0der
- 154
- 4
- 15
0
votes
1 answer
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:
NAME STATE READ WRITE CKSUM
rpool ONLINE 0 0…
Stanimir Stoyanov
- 186
- 2
- 10
0
votes
0 answers
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:
Prior Lee
- 1
- 1
0
votes
1 answer
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.stackexchange.com/a/463819/351968) saying that adding more memory RAM can help, but I'm not sure because I did not…
mario
- 145
- 1
- 8
0
votes
1 answer
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 using mdadm and Btrfs on top of that (no Btrfs RAID).…
lumbric
- 234
- 2
- 9
0
votes
1 answer
Fio brandswitch measure
In disk benchmarking tool fio there is statistics for brandswitch
Run status group 0 (all jobs):
READ: bw=20.9MiB/s (21.9MB/s), 10.4MiB/s-10.8MiB/s (10.9MB/s-11.3MB/s), io=64.0MiB (67.1MB), run=2973-3069msec
According for docs:
Values outside of…
ogbofjnr
- 173
- 1
- 10
0
votes
0 answers
What are the best practices for device-mapper multipath?
Background: We are setting up the new storage for an HPC Compute cluster for applied statistics, bioinformatics, and genomics. Contrary to our expectations, an active-active configuration did not improve I/O performance compared to failover under…
Nicolas De Jay
- 209
- 2
- 11
0
votes
1 answer
cat an file programs fail to acess a file but vi works properly (Debian)
I have getting some problems with my system after a bad reset via ctrl+alt+del. Since then errors related to ACPI and ata6 are reported. Trying to get a solution to this (in a savage way:I am n00b), I started to test the contends in the directory…
Daniel Bandeira
- 103
- 4
0
votes
1 answer
nginx + php-fpm extremely high amounts of data written to disk
We are facing a problem with extremely high data writes to disk and huge amounts of traffic over loopback interface.
Environment:
Debian 10.3 (4.19.0.8) - virtualized in hyper-v
nginx/1.14.2
php-fpm 7.3
mariadb Ver 15.1 Distrib 10.3.22-MariaDB
The…
nb_nwl
- 1
0
votes
1 answer
jdb2 spike every hour for few seconds
I get IO hang up every hour on the exact same time on my Ubuntu 18.04 server.
iotop indicate that jbd2 spike to araong 30% around this time.
The hangup last only few seconds.
I started noticing this when mysql_slow_query log also get filled up…
-1
votes
1 answer
VMWare - VM won't start - 5 (Input/output error) - failed drive
Basics:
Server with 4 drives, 2 solid state. One of the solid state drives appears to have failed. Running VMWare 5.0
We tried to distribute the VMs over several disks and using RAID, but I'm not sure if it was setup incorrectly. We tried to ensure…
NEW2WEB
- 119
- 1
- 6
-1
votes
1 answer
Ubuntu CPU I/O Rate Spike
Getting really crazy spikes today on a Ubuntu server for CPU / IO.
CPU Chart is showing as much as 210% CPU usage - no idea how that is possible. IO has gone as high as 11912. (Usually well under 1000).
Not a server type - I've run top and it shows…
the.s.brom
- 41
- 5