Questions about server hardware and software performance, or network performance.

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2answers
36 views

Remote Desktop 2012 R2 performance lacks when multiple sessions are open

We have a performance issue on our Virtual Windows 2012 R2 server that is configured as a Remote Desktop Server. Also a customer of us, that uses our software, is facing the same problem on a 2012 R2 ...
3
votes
1answer
31 views

For MySQL performance, all things being equal, does single threaded processor performance matter more or overall performance?

Say I have two servers, both with the same RAID 10 SSD HDD, 128GB Ram, etc.. I'm trying to figure out which server to get. There is a significant price difference between these two following setups, ...
8
votes
2answers
3k views

How do you disable the “last accessed” attribute on NTFS/Windows?

Inspired by this answer, I realize I have no idea how to disable the last accessed attribute in Windows to increase performance. If you can, how? I know in Linux you can mount the partition with the '...
0
votes
1answer
40 views

/proc/diskstats: No such file or directory

Trying to get some disk performance metrics (in particular, using munin), found that /proc/diskstats does not exist. Tried yum provides '*/diskstats' but nothing except munin was found. CentOS ...
0
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1answer
2k views

Performance Issue Between SQL and IIS on Seperate Machines

First time OP on serverfault, but an avid user of stackoverflow. We have two high-specification boxes, both running Windows Server 2008 R2 Standard. On one we have IIS 7.5, the other SQL Server 2008 ...
4
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0answers
80 views

Higher TCP latencies in the latest versions of Linux

In my research group, we recently upgraded the OS on our machines from Red Hat 6.2 to Debian 8.3 and observed that the TCP round trip time through the integrated Intel 1G NICs between our machines had ...
-2
votes
0answers
14 views

server capabilities for 2000 active users [duplicate]

I have a CentOS 7 with Apache2 and a Drupal application with a MariaDB database. The application must be available for 2000 users and sometimes about 1800 users will be using it simultaneously. I was ...
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2answers
38 views

RAID0 SSDs slow on HP ProLiant

TL;DR Is the RAID controller on the HP ProLiant DL360 G7 known to be slow or problematic? My RAID0 set is performing horribly. I have an HP ProLiant DL360 G7. It came with a 160GiB SAS HDD, and I ...
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0answers
16 views

fio results of performance measurements (esxi+RAID10) better under Windows than Linux

Summing up On same hardware: fio, Debian 8 on bare metal: read : bw=11973KB/s, iops=1485, clat 99.00th=[ 758] fio, Windows 2008 R2 in ESXi 5.5u2 VM: read : bw=43277KB/s, iops=5398, clat 99.00th=[ ...
1
vote
1answer
2k views

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++ ...
1
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0answers
24 views

Want can be the cause of high number of nfs_lookup requests?

Since a recent linux kernel upgrade (3.2.78 on Debian Wheezy) on both my NFS clients and NFS server, I'm seeing really high increase (10 to 20 folds) in the number of nfs_lookup requests from the ...
1
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0answers
27 views

SSD bandwidth issue and analysis

I have Intel's P3700 SSD mounted on a Lenovo x3650 M5 server with two Intel Xeon E5-2630 v3 CPUs. The server is running Ubuntu 14.04 with 4.6.4 Kernel. I've been using fio to benchmark the SSD using ...
3
votes
2answers
58 views

How to compare mainframe CPU performance?

I am working with an application that runs on tomcat in OMVS. It run terribly on one mainframe, and adequately another another. Is there a way I can compare the CPU of the two mainframes as a ...
-1
votes
0answers
25 views

Windows power management destroys performance [migrated]

I'm using Haswell i7-4790k on a gigabyte Z97-HD3 board with Windows 2012R2. Single threaded cpu-intensive workloads do not cause the Maximum Frequency cap to be lifted when the "Balanced" or "Power ...
11
votes
3answers
1k views

Effect of distance from server

I have a web server in Ireland (Amazon AWS). This server appears fast from Germany (orange line) but slow from the USA (black line). The HTTP request used for the test is the same. I think this is ...
0
votes
0answers
9 views

Redis Performance Tanks as Number of Nodes Increases

Strange problem. We have 6 nodes behind a loadbalancer. They are high-spec VPSes running Ubuntu. On a separate node we run Redis. Further nodes run MySQL. The whole LAMP setup hosts Magento. ...
3
votes
3answers
713 views

DRBD terrible sync performance on 10GigE

I've set up a pair of identical servers with RAID arrays (8 cores, 16GB RAM, 12x2 TB RAID6), 3 10GigE interfaces, to host some highly available services. The systems are currently running Debian 7.9 ...
5
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0answers
128 views

Suddenly slow RAID performance

We recently noticed our database queries have been taking much longer than usual to run. After some investigation, it looks like we're getting very slow disk reads. We've run into a similar problem ...
3
votes
1answer
33 views

KVM direct disk access vs raw files

I have to setup 14TB of raid storage space (which just shows up as /dev/sdb). My question is: Is there any impact on performance from a kvm guest if I create ext4 on this large drive directly, mount ...
1
vote
1answer
51 views

IIS Performance Issues with Flat Files (html, css, js)

We're running an Windows 2012R2 VM with IIS 8.5 with the purpose of serving out flat files, no ASP.NET or other dynamic content is in use. The server is configured to map 5 sites to the same IP & ...
-5
votes
0answers
21 views

What specification server can handle 1 million mySQL queries and 5 million PHP scripts daily? [duplicate]

What kind of specification would I need for running 1 million mySQL queries and 5 million PHP scripts daily (with 80% of the load being between 8am and 10pm). I know databases can require massive IO ...
2
votes
2answers
101 views

Does it involve network to copy a file within a NFS share? [closed]

I am assuming the following ways to copy a file with in a NFS share: Process 1: The client requests for the data to be copied from NFS share (if cache is not there) and the chunks of data are ...
14
votes
10answers
7k views

System degredation - does Windows slow down over time?

I am having a small squabble at work with our admin regarding a colleague's laptop. The laptop is bordering on unusable. The admin tidied up some temp directories and defragged the HDD a few months ...
12
votes
2answers
10k views

Rabbitmq - Reasonable performance/scale expectations

I'd be grateful if anyone could point me in the direction of some reasonable scale figures/limitations on rabbitmq (on "average" hardware, fwiw) or post your experience with its performance. I'm ...
0
votes
1answer
74 views

NGINX Reverse Proxy, Config Video(MJPG) Stream to use a single connection to the Backend Server

I have a question/problem weather it is possible to configure a NGINX Reverse Proxy so that it does not Proxy every Request of a Video Stream to the Backend Server, instead Opening a Single Connection ...
2
votes
0answers
15 views

Data throughput/latency and poe performance in TPLINK TL-SG2424P 24 ports POE Managed Switch

I recently bought a TPLINK TL-SG2424P 24 ports POE Managed Switch. At the moment I'm going to use it with only a handful of access points, no more than 4 or 5, at least until the end of the year ...
-3
votes
1answer
28 views

Has my RAID drive failed?

I checked the output of my server today and it said: root@s01 [~]# mdadm --detail /dev/md1 /dev/md1: Version : 1.1 Creation Time : Sat Jul 7 18:23:24 2012 Raid Level : raid1 ...
0
votes
1answer
29 views

I/O scheduling on LVM on dm-crypt

I have the following setup: Stock Debian stable (Linux kernel 3.16.7) running on Dell PowerEdge R320 Two SATA hard drives in RAID1 on a PERC H310 Mini controller, visible as /dev/sda dm-crypt target ...
1
vote
1answer
1k views

MySQL Extremely High Disk Activity (Read Operations)

I have 1GB Linode VPS with a standard LAMP stack. Apache is tuned fine but for some reason MySQL's disk usage is high. This is causing really slow site load times. RAM and CPU usage are fine. Can ...
1
vote
3answers
4k views

Office 2007 running under Windows 7 is slow to save files to network

Saving an Excel or Word 2007 file to a network share is very slow in Office 2007. It might take as long as two minutes two save a 100kb file. What could be causing this? The network share is hosted ...
2
votes
3answers
40 views

Disk I/O and load average peaks once every hour

We have updated our server from Debian Wheezy to Jessie and from php5.6 to php7.0, but now we have a disk I/O and load average peak exactly every hour. The exact time depends on the system start time. ...
3
votes
7answers
20k views

What can cause Apache HTTPD to use 100% CPU indefinitely

An application running a lightly loaded Apache HTTPD 2.0 has occasionally had problems where one (or more?) of the Apache processes took 100% CPU. We currently run HTTPD 2.2, I we may have seen this ...
1
vote
3answers
4k views

How to test disk latency on Linux?

Made an upgrade of RAID firmware and latency as it seems have increased. Could you please advise on the most accurate way to examine disk read and write latencies?
1
vote
1answer
34 views

Seeking inside file performance under BTRFS with LZO compression

I am planning to use btrfs on a 50 TB RAID6 array and I want to enable lzo compression. This is for bioinformatics setup where lots of seeking within large (1 TB -- 20 TB) files occur. (The software ...
8
votes
5answers
23k views

Does the DisablePagingExecutive registry change have any actual effect?

On a number of machines in the past, across different versions of Windows (2000, XP, and no Vista), I've enabled DisablePagingExecutive to try and improve performance. In each case, and I've had ...
2
votes
0answers
32 views

Calculation of Xeon server memory bandwidth

I am looking at a dual socket server based on the Intel(R) Xeon(R) CPU E5-2640 v3 @ 2.60GHz The configuration looks like this. 4 memory channels per socket DIMMs are 8x32 GB DDR4 2133/1866 modules ...
29
votes
6answers
86k views

High load average, low CPU usage - why?

We're seeing huge performance problems on a web application and we're trying to find the bottleneck. I am not a sysadmin so there is some stuff I don't quite get. Some basic investigation shows the ...
0
votes
0answers
8 views

Recommended Hardware for a school lab LTSP [duplicate]

currently I'm working on a project for a elementary school's computer room/lab. They have a lot of old computers (AMD Athlon CPU f.e.) with WinXP. The teachers are afraid of using that insecure ...
1
vote
2answers
1k views

Ubuntu Server 14.04LTS Swappiness for server with 16GB memory [closed]

(don't worry I'm not asking what my setting should be, asking for the theory behind some conflicting advice I've read) My application is one that is lightweight and not under much load, but needs to ...
0
votes
1answer
51 views

Does the Dell backplane affect the speed of the drives?

I've already checked the following questions but couldn't find an answer: Does the backplane on an HP server have any impact on the speed of the drives? 3rd party SSD drive in HP Proliant server only ...
0
votes
0answers
16 views

How to check that VMWare virtual machine is receiving sufficient resources from the physical server?

We have VMWare virtual machine in data center but applications on it suddenly started to be slow after one weekend. We are considering possibility that data center has moved virtual machine to other ...
0
votes
0answers
13 views

Sar command “sar -n EDEV -f /var/log/sa/sa16 -s 11:00:00 -e 15:00:00”

sar -n EDEV -f /var/log/sa/sa16 -s 11:00:00 -e 15:00:00 I am using above command on Red Hat Enterprise Linux Server release 5.9, and below is the output to that:(Dev error form 11 am to 3 pm). I have ...
3
votes
2answers
1k views

Files served from Apache are slower than other methods

I have a vps with a 1Gb/s line, when running apps on the server I can get (be it not full) reasonable speeds, but when downloading files through apache from this server I never reach close to my line ...
8
votes
6answers
5k views

How to identify heavy write to disk?

I have this problem with server running CakePHP application. The server is insanely slow, I first thought that it's application problem, but then I found constant 5-6MB/s write to disk. What is the ...
2
votes
0answers
75 views

Poor performance with docker internal DNS

I have a problem with docker internal DNS. On one of docker container dns server is so slow that it time out most of the queries. Docker is installed in KVM virtual machine and I have several ...
0
votes
1answer
40 views

Performance comparison of single RAID vs multiple filesystems

I'm trying to get maximum sequential disk throughput for an application on my Linux server. It has 7 SATA disks that I could put in one RAID0 or RAID5 using a hardware RAID controller (HP P420i). Or, ...
0
votes
2answers
66 views

Confused about Azure Storage Performance

In my experience so far with Azure the biggest bottleneck seems to be Storage performance. I did a few tests with Crystal Disk Mark and as you can see below the performance is very poor. Especially ...
12
votes
4answers
8k views

LVM Performance overhead?

I would be thankfull if someone who understands how LVM works, could tell me a rough estimate, how much slower using LVM (with a Software RAID1) will be. (What I do not want to know how much slower ...
0
votes
0answers
22 views

How can I launch graph500 benchmark on nVidia GPU with CUDA?

How can I launch graph500 benchmark on nVidia GPU with CUDA? There is written: https://devblogs.nvidia.com/parallelforall/gpus-graph-predictive-analytics/ At the IEEE Bigdata conference later in ...
0
votes
2answers
319 views

MAXDOP and Interesting Performance Experiences

i would like to receive an advice on the following topic. With one of our products from our company we "connect" to an existing database on customers side and import orders into our own SQL Server to ...