Questions tagged [fio]
The fio tag has no usage guidance.
14
questions
9
votes
1
answer
463
views
Understanding ZFS NVMe benchmarks with FIO
I'm trying to benchmark an all-NVMe ZFS disk array. I'm familiar with extremely fast benchmark results, with very little disk activity due to efficient ZFS caching. I ran into the reverse: massive ...
- 167
4
votes
1
answer
185
views
why read is faster when using O_DIRECT flag?
I copied a 10GB of file in my SSD which has read bandwidth of around 3.3GB/s, benchmarked using fio command. Here is the ref: https://cloud.google.com/compute/docs/disks/benchmarking-pd-performance
I ...
- 43
0
votes
0
answers
174
views
ZoL+FIO Randwrite nvme bs=8k@32io = 148MiB/s?
Sorry for the title, but it's very short summary of BS that I'm looking into. Situation
I'm using ZoL 2.1.5 (from jonathonf's ppa) on Ubuntu (tried 20.04&22.04)
I have following NVMe disk
...
0
votes
2
answers
94
views
System auto restart during the FIO stress test on a RAID0 array(6x SSDs) created by mdadm under Yocto OS
I met a problem when executing FIO stress test on a RAID0 which built from 6x SSDs thru mdadm under Yocto OS, below is the information:
6x PCIe NVMe SSD are the same vendor and model which is with 1....
1
vote
0
answers
421
views
FIO test results wildly vary based on number of jobs
Take the following 3 commands:
fio --name=write_throughput --numjobs=8 \
--size=10G --time_based --runtime=60s --ramp_time=2s --ioengine=libaio \
--direct=1 --verify=0 --bs=1M --iodepth=64 --rw=write \...
- 273
0
votes
1
answer
887
views
How to read and decode fio --bandwidth-log?
I'm Looking for assistance with reading and decoding fio --bandwidth-log.
I've run the below command and the output includes a few columns as listed below, how to read and decode each column?
fio --...
- 1
2
votes
1
answer
461
views
Interpreting fio test result
I ran fio on a VM provided by my VPS provider and got this result:
$ fio --name=random-write --ioengine=posixaio --rw=randwrite --bs=4k --numjobs=1 --size=4g --iodepth=1 --runtime=60 --time_based --...
- 5,038
0
votes
0
answers
1k
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FIO 17x slower on ZFS than raw device
I have ZFS pool RAIDZ-1 on 4 x 3.84TB SATA3 'enterprise' SSDs.
zfs create rpool/fio
zfs set primarycache=none rpool/fio
fio --ioengine=sync --filename=[X] --direct=1 --rw=read --bs=4K --numjobs=1 --...
- 35
0
votes
1
answer
313
views
How to correctly benchmark sequential read speeds on 2.5" hard drive with fio on FreeBSD?
Like suggested in https://askubuntu.com/a/991311 I tested the read speed of a 2.5" spinning hard drive on a TrueNAS/FreeBSD system.
For "Sequential READ speed with big blocks":
fio --...
- 73
-1
votes
1
answer
403
views
Simulate some process IO with fio or other tool
Is there any way to track a specific process and get stats for disk IO such as queue depth, total reading/writing threads, percent of reads/writes and so on?
The main goal is to use all that ...
- 103
1
vote
1
answer
397
views
`fio` does not timeout even specified?
# fio --name=random-write --directory=/mnt/test/ --ioengine=posixaio --rw=randwrite -bs=4k --numjobs=1 --size=4g -iodepth=1 -runtime=600 --time_based --end_fsync=1
random-write: (g=0): rw=randwrite, ...
- 245
2
votes
2
answers
310
views
AWS XFS performance issues. Stripped setup vs single disk setup
I wanted to share an issue (I guess I may be misunderstanding some concepts) that I'm facing with some benchmarks I'm doing to XFS setups, as we are going to recently migrate a service to a new ...
- 149
6
votes
1
answer
721
views
fio 3.23 core dumps when bench-marking many small files
I have been asked to come up fio benchmark results for this test dataset: 1048576x1MiB. So, overall size is 1TiB. The set contains 2^20 1MiB files. The server runs CentOS Linux release 7.8.2003 (Core)...
- 63
7
votes
0
answers
2k
views
Write performance is 5 times worse with LUKS on top of mdadm RAID10 than without LUKS
I have servers with many NVMe disks. I am testing disk performance with fio using the following:
fio --name=asdf --rw=randwrite --direct=1 --ioengine=libaio --bs=16k --numjobs=8 --size=10G --runtime=...
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