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

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2
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24 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 ...
0
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0answers
7 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
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0answers
25 views

Why database performance decrease in different data centers? [on hold]

I'm trying to migrate all our infrastructure to the cloud. In order to do that, we need to ensure that our application performance would, at least, be the same. So we set 2 environment with our ...
0
votes
1answer
39 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
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0answers
15 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
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0answers
8 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 ...
-1
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0answers
15 views

Optimizing Backup Server for Transfer Speed

We’ve built a backup server with both internal and external arrays for hosting our SQL and file server backups. The internal array is humming along but the external array is 10x slower to back up the ...
1
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0answers
48 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
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1answer
29 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
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2answers
60 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 ...
0
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0answers
14 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
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0answers
8 views

What resources spent symlinks? [duplicate]

I'm working on a web application that makes use of symbolic links. It is a SaaS application where for each user generates symlinks of a core folder and serve them on a new hostname selected by the ...
0
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0answers
12 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 ...
2
votes
1answer
59 views

MySQL performance problems after hardware upgrade and move to VM

Recently we've ran some (security) updates on our servers and rebooted the machines. Our development server did not came online anymore due to a problem with the GPU (integrated in CPU). We've ...
1
vote
1answer
36 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 great another another. Is there a way I can compare the CPU of the two mainframes as a reference? ...
0
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0answers
30 views

small client-server app & db install location

We're running Server 2008 R2 on dual 2.8 GHz processors with 32 GB memory and a partitioned 1 TB, 3-disc RAID. Seems plenty robust for our purposes. Our primary application, however, has been lagging ...
1
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0answers
23 views

Extremelly slow SMB download, normal SMB upload over LAN

I've been having an issue with a Windows 10 client experiencing very slow download speeds over SMB, but normal upload speeds. I'm able to demonstrate this using LAN Speed Test with the following ...
0
votes
1answer
91 views

High CPU Load on Synology by smbd

I have a Synology DS213j which I access through a VPN via the build-in VPN Server (I use OpenVPN) using Windows Explorer. Copying files to my local hard drive is very slow in the range of only ~170 ...
1
vote
1answer
25 views

Is there a way to configure sudo to not need to lookup group names / or speed up sssd group name resolution?

I've got a large number of Linux hosts that are connected using sssd to a windows active directory domain for user/group lookup. That mostly works fine except for one problem; sudo From what I'...
11
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4answers
1k views

Load time impact of htaccess

There are in general two possibilities of handling stuff on Apache: make configurations for folders one by one using htaccess file to fully resign htaccess and put all the rules into the httpd.conf ...
2
votes
1answer
20 views

Is NUMA always completely NUMA or are there also hybrid systems?

I am working on a high-end server application where performance is critical. Given that servers are often employ NUMA-architectures, the server application also uses NUMA-aware memory allocation ...
0
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0answers
28 views

nginx / node server TTFB very high sometimes

I currently have 2 nodes app on a nginx server behind is a mongo db and a elastic search instance. I currently face serious performance issue, this is not related to an overload of number of user, ...
2
votes
2answers
91 views

How can SSD write performance be dramatically different on two identical servers?

I am renting two identical physical servers (at Serverloft). These servers come with 2x512 GB SSD disks, and I've set them up with mdadm in a RAID1. The disks are locally installed in the server. The ...
0
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0answers
17 views

Gathering Performance Metrics (RAM, CPU, etc) AWS & Azure

We're developing a cross cloud plane performance metric harvester, to collect various performance metrics, but the top 3 being RAM usage, CPU Utilization and Disk Utilization. I know CloudWatch will ...
1
vote
2answers
45 views

How to balance elasticsearch (java) on a very powerful machine?

On a 16 core XEON class, 128GB RAM RHEL server I want to deploy elasticsearch. What is preferable performance-wise? Have a huge elasticsearch process to use all resources on the native host? Break ...
2
votes
0answers
8 views

Move htaccess rules to apache configuration files

I'm running a website with Joomla on a dedicated server (Debian), and i've read that moving .htaccess rules to apache2 configuration files may result in a good performance improvement (Apache HTTP ...
0
votes
0answers
40 views

How to find which db/collection/query triggers disk read?

We're running a MongoDB 3.0 server with multiple users accessing it and we're experiencing very frequent disk reads by mongod process utilizing our SSD drives to 100% During these peaks the page ...
0
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0answers
23 views

We are constantly getting CPU Spikes and site slows down [duplicate]

Our website works fine and fast, then out of nowhere cpu spikes to 100% site becomes really slow and after 10 minutes it is back to normal, this is constantly happening. How would one diagnose this? ...
1
vote
1answer
215 views

Huge performance penalty in gbit link with ip forwarding / masquerade through clear VPN tunnel

I have a problem with IP forwarding between my home computer and a remote server (from online.net). My home connection is a 1 Gbit/s FTTH and the remote server has a 2.5 Gbit/s bandwidth. The context ...
-1
votes
1answer
49 views

mpm_prefork values for 2-4 GB RAM [duplicate]

I have bought new linode (1GB). On this page :https://www.linode.com/docs/websites/lamp/install-lamp-on-ubuntu-16-04 Linode says: Below are the suggested values for a 1GB Linode: File:/etc/...
4
votes
2answers
67 views

Massive performance degradation on sustained sequential write

I'm in the process of migrating data into LUKS partitions. Now that the operating system drive is running off LUKS, I tried to start migrating the data drives. Then the server stopped responding. ...
0
votes
0answers
30 views

RAID 1 disk sequential read/write speed inconsistent

I have an issue with 2 of my servers, and I'm not sure what's going on. The setup is the same for all my servers: C: 2 SSD 512GB in RAID-1 D: 2 SSD 512GB in RAID-1 The servers are DELL's, the ...
1
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0answers
11 views

Windows Server Backup Snap-In Initializes/Moves Extremely Slowly

I have an SBS-2011 box. The WSB snap-in consistently takes 10+ minutes to move beyond 'Reading Data'. After the snap-in finally initializes I experience the same behavior when performing a recovery. ...
1
vote
1answer
107 views

How to identify the cause of 100% CPU usage in Azure App Service?

I have five apps in an Azure App Service Plan, all different copies of the same app for different clients. It's an ASP.NET MVC app with an SQL database. This morning I woke up to slow and non-...
-2
votes
1answer
41 views

Analyzing server performance [duplicate]

Analyzing server performance Hi we have recently finished work on one ecommerce site which is built on opencart 2.x and site has around 1k products. The site is currently running on VPS server. from ...
0
votes
0answers
14 views

Servers experience intermittent CPU “sensitivity”

We have a strange intermittent issue with a few servers where their CPU's become more "sensitive" to load. By this I mean that processes that generally run without issue, suddenly take up ...
0
votes
1answer
22 views

Best performance- and backup-strategy with running multiple Webapps and databases on dedicated servers

my company is soon going to move our webservice-hosting to a new hoster and therefore i'm currently planing how everything will run in the future. I have to deploy at least: MsSQL-Database Server ...
1
vote
0answers
22 views

HTTP/2 and SPDY running together in Apache

I have the latest Apache installed and currently support HTTP/2. Can I setup SPDY and run it together with HTTP/2? The goal is to also take advantage of the SPDY for browsers that do not support HTTP/...
3
votes
2answers
76 views

Measuring 40Gbe performance

I've connected two hosts via a 40Gbe fibre link and would like to determine a baseline for data transfer between them. I'm seeing relatively low speeds (~620MB/s). It seems that the signalling rate is ...
2
votes
3answers
119 views

SAS / SATA max number of connected disks vs performance

I would like to understand following things: When I have a motherboard with SATA 6gb/s and 8 ports, does it mean that every single port is able to provide 6bg/s speed to disk that is connected over ...
2
votes
0answers
16 views

Forking loads disk

I have a prefork/fork daemon. By atop I see, that master-process often consumes disk: PID TID RDDSK WRDSK WCANCL DSK CMD 16830 - 7264K 48696K 18624K 10% our daemon From strace I see, that it ...
3
votes
3answers
412 views

How to load balance with respect to memory, disk usage, and other attributes

I've found load balancers such as NGINX but those seem to work only by keeping in mind CPU usage and network traffic. How would I load balance with respect to other variables such as the amount of ...
-2
votes
1answer
114 views

top: sy higher than 70: What is going on here?

From the man page of top: sy: time running kernel processes The sy-value has peaks with values above 50, and then goes down to about 5 again. What could be the root of it? Here are two ...
1
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0answers
20 views

rsync: Maximum nice to keep system responsive

Unfortunately a background rsync reduces the responsiveness of a server. I search a way to have maximum niceness for this background task, to keep the server respond fast. My current wrapper ...
1
vote
0answers
34 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
2answers
522 views

How can I chose a max load threshold depending on the number of available cores?

I have a pipeline that runs some computationally intensive tasks on a Linux machine. The script that launches these checks the current load average and—if it is above a certain threshold— waits until ...
1
vote
3answers
65 views

How to improve AWS RDS Performance - Heavy read write updates

After searching and reading as many posts, comments and discussions I could find I did not find one specific to my issue. I have multiple AWS EC2 deployments with a single RDS all in the same ...
3
votes
0answers
61 views

Improve SSL Performance with Nginx

We have Nginx in the front of our system and we Proxy to Apache at the back. We use SSL/TLS for our connection. Question: Is Nginx the best option to terminate SSL/TLS connections in terms of ...
1
vote
1answer
59 views

TcpTimedWaitDelay is missing in Windows Server 2012

Suddenly my server log shows: An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full And I googled and found these links as ...