Questions tagged [iops]
The iops tag has no usage guidance.
112
questions
0
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0
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14
views
Reasons for high disk time but minimal IOPS
Can anyone possibly suggest scenarios on a large database system where system stats show a rapidly increasing disk time stats, but next to no actual disk IO? When working with lots of large files, ...
- 254
0
votes
0
answers
122
views
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 ...
google-cloud-platform
0
votes
0
answers
207
views
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 = ...
0
votes
0
answers
1k
views
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 ...
- 125
-1
votes
1
answer
220
views
SSD IOPS inquire
I have question about IOPS
For example is there difference in IOPS if the SSD was ( sata 2.5 or M.2 sata or M.2 M-key nvme )
i know
sata interface = 600MB
M.2 sata = 600MB
m.2 M-Key nvme = 2000MB
But ...
- 1
1
vote
2
answers
746
views
AWS i3en.3xlarge really low iops
I just launched a new instance ec2 instance of type i3en.3xlarge. Operating system is Ubuntu. I mounted the NVMe Instance store but every speed test I run is incredible low at around 7k iops. What am ...
0
votes
2
answers
941
views
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?
2
votes
1
answer
496
views
Interpreting fio test result
I ran fio on a VM provided by my VPS provider and got this result:
$ fio --name=random-write --ioengine=posixaio --rw=randwrite --bs=4k --numjobs=1 --size=4g --iodepth=1 --runtime=60 --time_based --...
- 5,048
0
votes
0
answers
45
views
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.
0
votes
1
answer
268
views
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 /...
- 1
1
vote
0
answers
124
views
degraded iops and throughput on a linux machine in a cluster
we have a linux-based cluster on AWS with 8 workers.
OS version (taken from /proc/version) is:
Linux version 5.4.0-1029-aws (buildd@lcy01-amd64-021) (gcc version 7.5.0 (Ubuntu 7.5.0-3ubuntu1~18.04)) #...
- 61
2
votes
2
answers
451
views
LOW IOPS after MySQL RDS Upgrade
We were hitting the upper limits of our IOPs the last several days. We provisioned more IOPS a few times. 1250 -> 2500 -> 4500. Each Step we quickly saw we were using all the available IOPS as ...
- 121
0
votes
1
answer
654
views
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 ...
- 183
-5
votes
1
answer
120
views
Google compute - Less vCPUs high IOPS vs More vCPUs low IOPS [closed]
My Postgresql databases are running on Google compute instances N1 with custom(26 vCPUs, 52 GB memmory) with a pessistent ssd disk 1.2TB . This setup is way underused, but keep the Read IOPS under 3k. ...
2
votes
2
answers
440
views
How should I interpret disk IOPS listed by cloud hosting providers vs. those listed by drive manufacturers?
When I look at disk (block device) storage options from various cloud hosting providers, I usually see numbers such as :
Google Cloud (Zonal SSD) : 15.000 - 100.000 read IOPS
OVH Cloud : (High Speed /...
- 1,576
0
votes
1
answer
1k
views
how to check the IOPS when I have multiple disks attached to an Azure VM
I have considered Azure Standard_E16s_V3 vm and attached two premium disks (p30 , 1024 GB & 5000 IOPS).
How can I calculate the average IOPS considering both disks. This is to check the possible ...
- 11
1
vote
0
answers
171
views
How much IOPS is recommended for large file read and write
How to select the number of IOPS required for processing a large file (hundreds of GB) in Azure Hybrid Disk?
I am using Azure blob storage for storing compressed (zstd) disk image backup (1TB disk ...
- 113
2
votes
2
answers
352
views
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: https://www....
- 321
4
votes
1
answer
3k
views
VMWare ESXI extremely high write latency
I hope you can help.. this is more of a sanity check just to verify my line of thinking at the minute. We've got a VMWare cluster setup that is networked to a high performance SAN. Everything performs ...
- 1,289
2
votes
3
answers
2k
views
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 ...
- 219
8
votes
2
answers
914
views
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 ...
- 608
2
votes
2
answers
2k
views
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 ...
- 4,297
1
vote
1
answer
2k
views
MySQL RDS Write IOPS high
One of my client is having RDS MySQL DB for which write IOPS is high when compared to read IOPS. Tried increasing CPU and Memory to 8 and 61 GB respectively, but still it is the same. This is a small ...
- 764
0
votes
1
answer
125
views
GCE Persistent SSD disks allocate more IOPS than specified
I've been testing GCE and created a VM with a persistent SSD disk to test disk performance. Persistent SSD disk that I configured was 37GB, which was supposed to give me 1110 IOPS but when I run ...
4
votes
1
answer
2k
views
Measuring Only Page Faults That Reach the Disk
I would like to measure "truly" hard page faults, i.e. page faults that result in a disk IO.
It looks as if Memory\Page Reads/sec might do the trick, but as was explained in this answer, the page ...
- 2,111
2
votes
1
answer
3k
views
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 ...
- 2,111
1
vote
1
answer
568
views
Low random read IOPS intel dc s4500
i have very bad read performance on my new intel ssd.
My configuration is:
HP proliant DL360e gen8 with Smart Array P222 controler.
Intel ssd dc s4500 960GB
64GB ram
2x Intel cpu
I have 2x SAS HDD ...
- 83
0
votes
1
answer
194
views
SSD Raid perfomance
Disks: 10xSSD Ultrastar SS200 960GB 12GB/s Raid 0, 6, 10.
Controller: LSI Syncro 9380-8e
Filesystem: ext4 without LVM
System: Centos 7
2x E5620 @ 2.40GHz
32GB RAM
fio-2.1.10: --iodepth=32 --ioengine=...
- 89
1
vote
2
answers
403
views
PerfMon within a VMware 6.5 VM in 2017: Accurate?
Looking to measure the performance of a VM over a two-week period, which means the Performance tab in vSphere client/UI is not really feasible.
esxitop appears to only track the host, not a ...
- 14k
0
votes
2
answers
79
views
Is there a better way to handle 100-200+ files/s?
I’ve got a challenge that as it stands right now, is hitting limitations of cloud computing in terms of IOPS and CPU. The thought is to bring these systems in-house long term but I think it can be ...
- 11
14
votes
2
answers
13k
views
Impact of RAID levels on IOPS [closed]
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 ...
- 1,852
1
vote
0
answers
602
views
How can I measure RAM/tmpfs IOPS from a specific application?
I am running a hadoop-based application (hadoop 1.2.1), where I had discovered a hard-disk bottleneck; monitoring the hard disk IOPS with iotop resulted in ~160 MB/sec, which was the writing speed I ...
- 111
7
votes
1
answer
4k
views
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 ...
- 91
3
votes
1
answer
331
views
Microsoft performance monitor counter - Disk activity & file
I'm looking for a way to quickly (via PowerShell Get-Counter) show me the I/O load (IOPS preferable to bytes) on a certain physical disk, along with the file access information - presumably the file ...
- 41
1
vote
1
answer
820
views
IOPS super low after creating volume from snapshot (AWS)
I'm using EC2 p2.xlarge instances to train an image processing model.
My target classes for the prediction task are quite a few (20) and to get the best accuracy I'm going to train one model per ...
- 115
1
vote
1
answer
1k
views
Strange IOPS performance on AWS R3.large & R4.large instances
I have used 4 10GB GP2 EBS volumes with RAID0 on Windows Server 2012R2 image as explained here: http://docs.aws.amazon.com/AWSEC2/latest/WindowsGuide/raid-config.html The instance type I used was R3....
- 774
1
vote
1
answer
2k
views
php-fpm with NGINX response time exponentially increase over time
I have a load balanced application on AWS, on two c4.2xlarge (8 vCPUs, 15GB ram) servers and they serve a very simplistic site but with a system call to ffmpeg encode a <5s mp4. Individually, the ...
- 217
34
votes
8
answers
13k
views
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 ...
- 513
1
vote
0
answers
156
views
AWS EC2 snapshot reaches IOPS limit occasionally
For an EC2 server I have running I am creating a snapshot of the EBS every night. The EBS has 500GB of space and 1500 / 3000 IOPS. On some days past week the snapshot creating process reached it ...
- 653
5
votes
2
answers
911
views
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 ...
- 163
0
votes
0
answers
514
views
The fio shows iops very less for CentOS6.0 vm running in kvm with backend disk SSD
Disk "iops" is very less with "fio" disk benchmark tool for CentOS 6.0 virtual machine running on KVM. When I execute same on CentOS 6.7 and CentOS 7.2, the iops is as expected. ...
4
votes
1
answer
766
views
Terrible (~1.4x vs expected ~2x) random read performance in new ZFS mirror (raid1)
I am testing a ZFS mirror using FIO (Flexible I/O tester) to understand the random read scalability of ZFS mirrors. The primary and secondary caches have been set to none as the application I use ...
- 1,657
1
vote
1
answer
1k
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IOPs Comparison and Block Size
As long as I know - IOps is a IO operations per second on a given data block. But size of that given block if often omitted.
I assume, that block size does not make difference as long as its ...
-3
votes
1
answer
397
views
How to configure Fio to a more accurate result of IOPs
I am using fio to test how much iops my server can offer. My conf file says to write a 20GB file and read it. THe results show iops=27291. But the test last only 10 seconds. I wonder if the test last ...
- 103
0
votes
1
answer
258
views
Drop in write performance when mirroring two RAID 0 arrays
On a CentOS 7 server with 4 SSDs, I created two RAID 0 arrays with mdadm. Both were formatted with ext4 and mounted on separate directories.
I benchmarked them using fio and got the following results ...
- 422
0
votes
1
answer
63
views
Purposefully overloading iops?
I was going to run a test with some of my junior devs on a few of our boxes and have them troubleshoot an "Out of IOPS" issue. I am curious if there is a way to purposefully overload or create an out ...
- 597
1
vote
0
answers
99
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XenServer 6.5 Zeroed Performance Metrics for IOPS
In one of my XenServer 6.5 pools, I'm adding some graphs in XenCenter to measure my iSCSI storage IOPS and throughput performance and I'm getting no response. The graph is actually responsive, but ...
- 199
3
votes
1
answer
2k
views
Different IOPs measured on server and storage
I have this strange behavior that I can not explain to myself - hopyfully someone here can.
We received some server (hardware) and mounted an NFS drive. We plan to use these servers as Splunk ...
- 171
3
votes
0
answers
245
views
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 ...
- 5,726
7
votes
5
answers
17k
views
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(...
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