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Questions tagged [iops]

111 questions
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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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Measuring disk usage

What is the fairest unit to determine the disk usage (except the total storage usage e.g. in GB)? IOPS? Bytes read / write? Bytes transferred over network (would be equal to Bytes r/w)? Other? And how can they determined under Linux? It's about…
Hativ
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IOPS bottleneck in design?

I'm building a 45 drives (backblaze) storage pod for use with Windows 2012 R2 Storage spaces. Spec is 2xE5-2620 v2 cpus, 32 GB ram, 3xLSI 9201-16i cards, 9x1 TB SATA SSDs, and 36x4TB HGST ultrastar SATA drives. Assuming a 50/50 read/write, the…
chris.w.mclean
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IOPs usage In HP Fata Disk Group VMware 5.1

We have a Blade with EVA storage array with 3 disk groups. One disk group consists of FATA 7200 1TB 18 hard drives, RAID 5, total IOPs 1000-1300. And I get statistics of used IOPs for this disk group of higher than 2000 IOPs. How can that be? If…
Javid
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Measuring IOPs and comparing with IOmeter

So I've got to somehow generate IOPs using some prehistoric metrics used in IOmeter (which can't run in a 64bit ubuntu environment) The settings used in IOmeter are: 16K block size, 75% read to 25% write ratio, with 80% random distribution. How…
Frustrated Admin
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Hard drives, how to calculate read and write speeds supported?

Possible Duplicate: dell 2T 7.2k nearline SAS 6Gbps- ingress/egress throughput I don't have access to machine/drive, but need to define specs to purchase one. What all things would it be dependent on? Using RAID 10, would improve it? Would it be…
Nagota
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dell 2T 7.2k nearline SAS 6Gbps- ingress/egress throughput

I would like to know, how to calculate sustained read and write speeds supported. I don't have access to machine/drive, but need to define specs to purchase one. What all things would it be dependent on? Using RAID 10, would improve it? Would it…
Nagota
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SAN I/O is horrible

I've been testing a SAN with fibre channel disks and I get 500MBPS Writes 200MBPS sequential reads and about 5MBPS randon reads / 1000 IOps max. Any idea why reads are so much slower? It is a 3PAR SAN attached using fibre channel switches. Seems we…
coderwhiz
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howto edit provisioned IOPS of an Extreme Persistent Disk

I'm looking how-to change/edit the provisioned IOPS setting of an Extreme Persistent disk. I'm not able to find any suitable API to change this settings and also seems not possible from the GUI. I'm looking some reference in the doc in case of this…
Matteo
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MariaDB I/O Limit

I have a server with MariaDB 10.6. The mysqld process uses 100% of DSK with very high I/O. I tried to set these values but it didn't have any affect: innodb_io_capacity = 100 innodb_io_capacity_max = 100 look at atop output Any solution?
Maor Bari
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How does RAID0 affect IOPS performance for NVMe SSDs?

I have an application which needs to read large amounts of small and randomly distributed entries from storage. To improve the performance I am considering to install a specialized hardware RAID controller (like a Highpoint SSD7505) together with…
Bobface
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Disk iops vs latency

I am trying to understand the diference between iops and latency, this is my question: If an hypothetical disk had 2 io per second, then its latency would be 0.5 seconds?
Javier Cintrón
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Azure MySQL IOPS will not go below 400

I am using Azure MySQL database, the tier is burstable (1-2 vCores), standard B1s, but the IOPS will not go below 400, which is supposed to be the max.
Johnson Dubula
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Linux -LMV DM devices IOPS count

I know this might sound like a silly question, but here I go. I have CentOS 7 running in a server with a disk using LVM, according to the vendor the disk could achieve 500 iops, the disk is under /dev/sda and I can see the LVM DM devices showing up…
Escanoru
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Latency in fio vs ioping

There are two tests: ioping -c 10 -S 4K -D . 9 requests completed in 2.49 ms, 36 KiB read, 3.61 k iops, 14.1 MiB/s generated 10 requests in 9.00 s, 40 KiB, 1 iops, 4.44 KiB/s min/avg/max/mdev = 259.5 us / 277.0 us / 325.0 us / 19.9 us sudo fio…
ogbofjnr
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