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Questions tagged [iops]

110 questions
34
votes
8 answers

Why do IOPS matter?

I understand what IOPS and throughput are. Throughput measures data flow as MB/s and IOPS says how many I/O operations are happening per second. What I don't understand is why many storage services just show the IOPS they provide. I really can't see…
mFeinstein
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14
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2 answers

Impact of RAID levels on IOPS

With regard to IOPS, I have seen several sources on the web that suggest the IOPS of a given number of disks is simply the IOPS of a single disk multiplied by the number of disks. If my understanding of IOPS is correct (and I'm not at all sure it…
dbr
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14
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7 answers

How do storage IOPS change in response to disk capacity?

All other things being equal, how would a storage array's IOPS performance change if one used larger disks. For example, take an array with 10 X 100GB disks. Measure IOPS for sequential 256kb block writes (or any IOPS metric) Let's assume the…
JDS
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14
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5 answers

ZFS: Redistribute zvol over all disks in the zpool?

Is there a way in which ZFS can be prompted to redistribute a given filesystem over the all of the disks in its zpool? I'm thinking of a scenario where I have a fixed size ZFS volume that's exported as a LUN over FC. The current zpool is small, just…
growse
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13
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3 answers

Relation between disk IOPS and sar tps

I'm trying to estimate IOPS requirements of my application running on 32-bit CentOS 6.2. I started to take some measurement on a machine with SATA disks and I'm quite confused of difference between IOPS and tps measured by sar. According to…
pystole
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9
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2 answers

Measuring IOPS in Linux

How would I find out how many IOPS my Linux system can handle?
Henno
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8
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2 answers

what is the IOPS behavior when partitions of single disk are used in an LVM?

I have an ubuntu 14.04.1 LTS server which have LVM(backed by hardware RAID5) with logical volume and a volume group named "dbstore-lv" and "dbstore-vg" which have sdb1 sdb2 sdb3 created from same sdb disk. The system as 42 cores and about 128G…
sherpaurgen
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8
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1 answer

Amazon: How do I know if I need Provisioned IOPS?

We recently moved to Amazon Web Servers and are still learning our way around. Our EC2 Web instance and our RDS MySQL instance (right now we only have 1 of each) seem to be chugging along okay. But I was wondering if we could get even better…
DOOManiac
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7
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1 answer

Better performance when HDD write cache is disabled? (HGST Ultrastar 7K6000 and Media Cache behavior)

Attention, please. Long read. During initial performance tests of Hitachi Ultrastar 7K6000 drives that I'm planning to use in my Ceph setup I've noticed a strange thing: write performance is better when disk write cache is disabled. I use…
J''
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6
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1 answer

Low SSD write IOPS (~100)

I am experiencing very low IOPS with a SSD in my server. I noticed this when running a mysql database server, which performed very bad when there were many (~100 per second) updates to an InnoDB Database. Here are the server specs: SSD:…
Hook
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6
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1 answer

Getting IOPS of the processes on Linux

So, what value should we read to get the in out operations per second per process? I've tried /proc/[pid]/io which returns these values: root@node:~# cat /proc/31597/io rchar: 213260190 wchar: 462308212 syscr: 23275044 syscw: 47797624 …
ispirto
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6
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1 answer

Can I determine IOPS on a disk array using bonnie++?

I would like to measure the read and write performance of a RAID6 array verses a RAID10 array. I understand that bonnie++ can be used to calculate disk performance, but the numbers produced by bonnie++ don't include terms like 'IOPS'. These days,…
Stefan Lasiewski
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6
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3 answers

Find current IOPS usage of EBS volume from my application on AWS EC2

I am relatively new to AWS and disk performance. I am trying to figure out how much provisioned IOPS does my application need to perform well. Currently My PHP and MySQL application is hosted on EC2 instances with simple EBS volumes attached. The…
Ruchit Rami
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5
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2 answers

Get an AWS EC2 ebs volume to perform over 20,000 IOPS

The company I work for is currently going through an AWS migration, and for 99% of services, their commodity hardware does the job just fine. Except for the production Database, we currently sit at 60,000 IOPS just to keep up with requests, and…
Ben Coughlan
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5
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5 answers

How to calculate current IOPS usage and IOPS credit count and graph on AWS RDS

I have a running Mysql db.m3.medium RDS instance at AWS, running with 20GB SSD as in: RDS machine description Last hour write and read operations went as following: Disk operations It looks like max(write)+max(read) operations total around…
Guilherme Silveira
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