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Questions tagged [iozone]

8 questions
5
votes
1 answer

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 1 (MegaRAID SAS 3108), 64MB cache, with BBU, but…
Vimal
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3
votes
2 answers

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 512 4 230006 596753 992087 …
Pellaeon
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2
votes
0 answers

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 LFF disks 7.2k rpm). host is centos 7, the…
matteo nunziati
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2
votes
2 answers

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 = 12753940.84 KB/sec Min throughput per process…
Istvan
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1
vote
2 answers

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, testing I/O with hardware RAID in various…
Frank Brenner
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1
vote
2 answers

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 impact of changing the network MTU from 1500 to 9000.…
larsks
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0
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1 answer

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 test on the zpool not the base filesystem.
shivams
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0
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1 answer

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 using the standard packages. I used iozone and dd to…
psiphi75
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