Questions tagged [iozone]

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2 votes
0 answers
647 views

kvm virtio disk performance scales badly with iozone workload

I'm conducting a number of tests in order understand why some of our workloads generate a really poor "user experience" with db related activities. We have a dl160g9 server with a B140i controller (4 ...
matteo nunziati's user avatar
5 votes
1 answer
511 views

Root-causing vastly different performance on iozone O_SYNC benchmark for two HDD manufacturers

I have two servers A and B with the following configuration: A: 4TB HDDs, with RAID 1 (MegaRAID SAS 2008), 128MB cache, no BBU, write-through mode, 7.2k RPM, manufacturer A. B: 1.5TB HDDs, with RAID ...
Vimal's user avatar
  • 153
0 votes
1 answer
3k views

How to specify the path which is to be tested using iozone?

I have a freebsd install which has ufs filesystem. Inside freebsd i have created a zpool in raidz1. Now i want to perform iozone test on zfs but i am not able to understand how to specify that iozone ...
shivams's user avatar
  • 499
0 votes
1 answer
2k views

Benchmarking GlusterFS & NFS on AWS using iozone and dd gives different results

I have tried benchmarking GlusterFS vs NFS on Amazon Web Services (AWS) using a m1.medium sized EC2 instance. We use the AWS EBS as the block store, with a XFS file system. Running Ubuntu 12.04 ...
psiphi75's user avatar
  • 151
3 votes
2 answers
4k views

What does "reclen" (record length) in iozone benchmark mean?

What does the "reclen" field mean? Googling showed that "reclen" = "record length", but I still don't know what "record length" means. KB reclen write rewrite read reread ...
Pellaeon's user avatar
  • 963
2 votes
2 answers
1k views

Iozone is producing false results

I am not sure why this is happening but these are totally false results: Children see throughput for 15 re-readers = 12793134.62 KB/sec Parent sees throughput for 15 re-readers = ...
Istvan's user avatar
  • 2,600
1 vote
2 answers
3k views

Iozone: sensible settings for a server with lots of RAM

I have just acquired a server with: 2x quadcore Xeons 48G ECC RAM 5x 160GB SSDs on an LSI 9260-8i Before deploying the target platform, I'd like to collect as much benchmark data as possible, ...
Frank Brenner's user avatar
1 vote
2 answers
264 views

Benchmarking disk performance on large-memory systems

I need to produce some comparative filesystem performance metrics for our virtual hosting environment. Specifically, I need to look at the difference between NFS and iSCSI and at the performance ...
larsks's user avatar
  • 44.6k