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Questions tagged [iops]

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Finding or estimating sequential vs random distribution of existing system (VMware / SAN)

IOMeter testing says the IOPs of the storage subsystem can range from hundreds of IOPs for 100% random loads to tens of thousands IOPs for 100% sequential loads. Is there any way I can measure or estimate the random/sequential distribution of the IO…
TessellatingHeckler
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Stress Test Hard Drive attached to a LSI controller on Hyper-V

I have a LSI 9265-8i controller running on Hyper-V. How can I stress-test the hard disks in-situ? I'd like to test things like iOPS, seek times etc.
RGI
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8Gb Fiber Channcel HBA vs. 10 Gb SPF+ Converged HBA

I am putting a Dell server together, more specifically R720. I have to select the correct Host Bus Adapter. This HBA on R710 will connect to a storage device. I am confused between these two: QLogic 2562, Dual Port 8Gb Optical Fiber Channel HBA …
H A
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IOmeter IOPS on Win2k3,Win2008, and Ubuntu 10.04

Summary: Given the same hardware, Ubuntu outperforms Win2k3 by about 50 percent when it comes to IOPS. Win2008R2 initially performs the same as Win2k3, but it gradually gains performance until it is on par with Ubuntu (takes about 20-30 seconds of…
truck0321
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Is basing storage requirements based on IOPS sufficient?

The current system in question is running SBS 2003, and is going to be migrated on new hardware to SBS 2008. Currently I'm seeing on average 200-300 disk transfers per second total across all the arrays in the system. The array seeing the bulk of…
Boden
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ZFS 2xRAIDZ2 vs 3xRAIDZ2 iops increase or not

12 hdds - 100MB/s streaming reads and writes and 250 read and write IOPS. When i do 2xRAIDZ2 so there is 2 vdev 6 HDD each the theoretical IOPS will be 500 according to this atricle:…
Kriss
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Is AWS i3.2xlarge limited to 10K IOPS?

I'm using an AWS i3.2xlarge EC2 instance and facing a limit of 10K IOPS. I wonder why that is? I only write on the NVMe instance storage. No matter what I do I can't pass that limit. I thought that I3 class instance could go way above that? Is…
MaatDeamon
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Amazon RDS: Why do I get more IOPS than I have provisioned?

We run a Multi-AZ r4.2xlarge Mysql RDS instance and we provision 2000 IOPS (which costs $400 per month extra). When I check the CloudWatch charts I can see large periods where the Write IOPS are more than the 2000 that we pay for: (during weekdays…
Tom
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Performance Counters: Page Reads/sec higher than Disk Reads/sec

Comparing the values for the Windows performance counters Page Reads/sec and Disk Reads/sec I noticed that page reads are consistently higher, which is strange, as it seems that page reads should be a subset of disk reads. Obviously, that is not the…
Helge Klein
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really low iops on ssd raid (lower than 1000)

I'm having serious performances problems on a server, with really low iops. server : ProLiant DL360p Gen8 with HP Smart Array P420i Controller (firmware v6) with 4x Samsung 840 - 512GB on raid 1+0 here's one samsung 840 details : hpacucli ctrl…
Cactusbone
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interpreting IOPS these Bonnie++ and iostat results

I am looking to interpret the IOPS from a few runs of bonnie++ using iostat simultaneously and using the benchmarking from this post: Can I determine IOPS on a disk array using bonnie++? bonnie++ run: /usr/sbin/bonnie++ -d /data -s 128754 -u…
sonicz
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How to determine IOPS needs after getting the Transfers/sec data?

Let's say that I have gathered Disk Transfers per second data for 2x24 hours period, i.e., instantaneous sampling of data every 15 seconds. What statistical analysis can/should I apply to the samples if I want to use the data to, for instance,…
pepoluan
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How to cut php-fpm IOPS

I have Amazon EC2 instance with NGINX + PHP-FPM (through socket) + APC. I see sth. like this in iotop on high load. Total DISK READ: 0.00 B/s | Total DISK WRITE: 0.00 B/s TID PRIO USER DISK READ DISK WRITE SWAPIN IO> …
Andrew
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Throughput = BS * IOPS?

I've seen in many places that throughput = bs * iops should be true. For example writing at 128k block size to a SAS disk that can support 190 IOPS should give a throughput of ~23 MBps - 23.75(MBs) = 128(BS)*190(SAS-15 IOPS)/1024. Now when I tested…
BlackBeret
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How to measure IOps one virtual machine on VMWare ESX?

How should I measure IOPS generated by a single Virtual Machine in VMWare ESX? Also what would be a normal amount of IOPS for a Windows XP virtual machine?
d_pilot
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