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Questions tagged [iops]

111 questions
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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 maximum IOPS causing the server to be unavailable for…
Bart Bergmans
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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 relatively small and I can compare iops requirements for…
Vasilly.Prokopyev
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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 values are kept on zero. That issue occurred only…
Maurício Mota
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Exchange 2013 reduce disk writes

I have some write problems on my system. One of the most ravenous virtual machine is Exchange 2013 with only 70 mailboxes. This is a writes list dump example: If we exclude all EDB files and exchange mailbox LOGs I get many application/performance…
Tobia
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Need the "msacli.exe" file for monitoring P2000 SAN. IOPS values needed

Hi i need some performance stats from our MSA p2000 SAN. The Problem is that i want to have the values i get when i connect via SSH and use the command "show vdisk-statistics". This command shows me the IOPS for all vdisks. But this are values just…
frupfrup
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The more threads the less IOPS?

I've just started trying out AWS. I have a Postgres micro instance on RDS and I'm running a crawler on a c4.large. When I have just one spider (one thread), I get about 10 write IOPS. but if two spiders (2 threads) were deployed, I get about just 7…
Kar
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Limiting - IOPS in VMware causing servers to run VERY slow

I have servers running a few different iSCSI SAN units. I was trying to balance IO requests to the datastores, so I started changing the "Limit - IOPS" on my servers from unlimited to 100-400 depending on what the servers role is. In doing this, it…
Litzner
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Many writes IO/s in Centos 6.5 - reverse ratio from read - as is normal

We have many CentOS6.5 servers on ESXI5.5. Storages for vmdk is SAN ISCI. I have problem with bad ratio for write/read. On storages I have about 2500 write io and e.g 200 read! For all time in day. For night is it about 1500/100e.g. Bellow is image…
Pavel
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Upgrade the storage and/or provisioned IOPS on a reserved RDS instance?

I would like to reserve an RDS instance, but as of right now my instance does not need a lot of storage provisioned. I would like to reserve the instance with 100GB and 500 IOPS provisioned, but I would like to increase this in the future if needed.…
Errol Fitzgerald
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Calculating IOPS for a single HDD - what am I doing wrong?

So I know there is no standardized way of calculating IOPS for a HDD, but from everything I have read it appears one of the most accurate formulas is the following: IOP/ms = + {rotational latency} + ({block size} / {data transfer rate}) Which is…
red888
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IOPS write increased, Disk write latency decreased, Avg req size decreased - Page load speed decreased

I have noticed decrease in server performance (page load speed become lower), then I went to investigate and have found in munin graphs (which tracks server's resources) that there was big changes on disk IOPS, disk latency, MySQL queries quantity.…
Arturas
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PHP Websites: Very high IOPS

We are hosting a set of websites on VM Cloud. These sites were previously on a couple of dedicated servers but to enhance performance, we transferred them onto a Cloud environment. The Cloud has SSD storage but they are now saying that we have very…
Khuram
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perfmon reporting higher IOPs than possible?

We created a monitoring report for IOPs on performance counters using Disk reads/sec and Disk writes/sec on four servers (physical boxes, no virtualization) that have 4x 15k 146GB SAS drives in RAID10 per server, set to check and record data every 1…
BlueToast
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Tools for gathering metrics about physical environment for use in virtualization/cloud planning?

I'm looking for tools that will work on either Linux/Unix or Windows Server that for a given set of servers in an enterprise environent, will: Identify the server [via hostname, or some other unique attribute] List the the number & type of CPUs +…
Sajee
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How to interpret iozone values

I ran a test to measure my I/O IOPS on Linux: iozone -s 4g -r 2k -r 4k -r 8k -r 16k -r 32k -O -b /tmp/results.xls iozone claims that output is in operations per second yet the numbers are too big for that to be plausible. I'm observing some 320…
Henno
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