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

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0
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1answer
14 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 ...
0
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0answers
7 views

Handling time based events within a cluster [on hold]

I have a Java app which loads up records from a database and then executes something every x mins/seconds, in a one machine environment, this works fine, however if this was to be run in a cluster, I ...
0
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0answers
19 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 ...
3
votes
2answers
61 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 ...
-1
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0answers
12 views

How to test Xen-Hypervisor performance [closed]

I need you guys help to do my term project of cloud computing class. Firstly, I have Ubuntu 14.04 and Xen 4.4 installed (finally, after days) on my system. My processor supports the virtualization. ...
2
votes
3answers
73 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
14 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
269 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 ...
0
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0answers
13 views

PHP IIS server website end user response time breakdown

I wish to monitor whole end user response time (with resulting indicators, tables, graphs, alerts) of a PHP IIS website (10k to 1000k clics per day). Does someone know how can I do ? My first idea is ...
-2
votes
1answer
80 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
vote
0answers
16 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
votes
0answers
32 views

HP DL 380 G8 ENERGY calculate [closed]

0 down vote Hello every one please i have some probléme calculing the energy power , i have a server : HP DL 380 G8 : - dual power supply - maximum number of disks and 1 baie StoreSimple ...
1
vote
0answers
18 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
424 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
2answers
36 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 ...
1
vote
0answers
45 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
21 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 ...
1
vote
1answer
26 views

Performance impact enabling intel vt-x

I have a rather unusual question: What is the performance impact when you enable vt-x and you don't need it? I ask this because all of the new servers I receive have this enabled by default in the ...
0
votes
1answer
18 views

What is the best way to analyze data captured from sar?

I've got some sysstat data that has been captured from servers with SAR, and I'm unsure what is the best way to analyze that data. I've found ksar, but it seems to be quite old and out of date. I'd ...
0
votes
1answer
18 views

Improving I/O rates for EBS snapshot backed volumes

I'm working with a system that takes a set of 42 rotating daily EBS snapshots of each of its numerous (40) volumes for disaster recovery purposes. EBS volumes are aggregated into a RAID volume. A set ...
7
votes
1answer
105 views

Sluggish performance on NTFS drive with large number of files

I am looking at this setup: Windows Server 2012 1 TB NTFS drive, 4 KB clusters, ~90% full ~10M files stored in 10,000 folders = ~1,000 files/folder Files mostly quite small < 50 KB Virtual drive ...
-1
votes
1answer
36 views

Which raid array will be best practices with seven 1.2 tb hdd system

I have a server which have seven 1.2 tb hard disks. I have to create raid array but i don't decide which raid i use? First of all, first and most important matter is security. At any cost i must not ...
0
votes
1answer
15 views

Increase openfire memory to larger values

We use OpenFire for XMPP messages. We have some memory issues(OutOfMemoryError), and therefor we would like to increase memory. I know how to increase memory using VM options and we were able to ...
0
votes
0answers
23 views

lower tcp throughput than expected

I've conducted some tests which measured tcp throughput via wireless and wired connection. (a) was wired link between my desktop and my home router. (b) was wireless link between my desktop and my ...
2
votes
1answer
50 views

Why might 'mpstat' and 'pidstat' disagree about CPU load levels?

I'm monitoring a mysql process in ubuntu 12.04 using mpstat and pidstat, simultaneously. While debugging its CPU usage, I noticed something unusual. While both tools agree that CPU load is occurring, ...
0
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0answers
19 views

Reduce Connecting time to server for inital request

I am struggling with decreasing load time of inital html page request. It is consistently above 800 ms however other websites they load in less than 300 ms. In this load time GTMetrix shows more than ...
-1
votes
0answers
17 views

Monit fails with message APACHE-STATUS: error — no scoreboard found

We have mod_status setup and we have the weblink monitor link working real well. both the http://www.example.com/server-status?refresh=5 and ...
0
votes
0answers
15 views

Does decommissioning nodes on hadoop cluster hamper performance?

I have 120 node Hadoop cluster, I have removed around 14 nodes in 7 days (each day - 2 nodes were decommissioned) Now users are facing some performance issues, does this decommission really matters. ...
3
votes
4answers
1k views

RAID 10 - many slow disks vs fewer fast disks

I am looking to buy HDDs for a single server which will be used as development server. The server will use ESXi as hypervisor and will have some but not too many virtual machines (web server, database ...
0
votes
1answer
21 views

Speed: nginx serving static content even faster: fixed folder ; how can I

we run centos and nginx one of latest versions in 2016. We use 1 media directory with some underlying subdirectories. FTTB for php is 200ms which is very fast - but now I discovered that the JS CSS ...
1
vote
0answers
44 views

Slow gigabit speeds with Ookla speedtest software

We have 2 speedtest servers (RHEL 6.7) sitting on 10GB links with a 10GB pipe between the two. The servers are separated geographically by about 256 miles but traceroutes look very good, with 4 hops ...
1
vote
1answer
31 views

How can I determine which files have high I/O in Windows?

In trying to reduce the storage bottleneck on a Windows server (2008 R2) I need to find the files that have the highest I/O over a long period of time (aka 'hot' files) so I can move those to SSD ...
0
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0answers
23 views

Real memory usage on Linux and Private_Dirty

On Linux, is using Private_Dirty value from smaps a good way to measure real process memory usage? Thanks
1
vote
1answer
57 views

Hardware performance penalty for Hyper-V Generation 2 VMs

I have the following configuration: Windows Server 2012 R2 OS installed on baremetal with Hyper-V. OS is installed on RAID1 850 PRO drives. Windows Server 2012 R2 Guest OS Generation 2 VM is located ...
0
votes
0answers
21 views

Why in my index in a cold situation that slow?

We have a table CREATE TABLE mytable ( ... myfield bigint, ... ) and an index CREATE INDEX fk_fk18edb1cf49a32f88_idx ON mytable USING btree (myfield); and a simple query SELECT count(*) ...
0
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0answers
39 views

Disk performance drops in VMWare ESXi 4.1 / 5 Linux Guest

I'm benchmarking disk write performance using this command: dd if=/dev/zero of=/mnt/test.dmp bs=1M count=256 conv=fdatasync After a random time and random number of attempts, the file system ...
1
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0answers
20 views

iperf actual send rate always lower than the expected target bandwidth until some equilibrium reached. Why?

I did an UDP iperf 2.0.5-Ubuntu test between two VMs on the same hypervisor. As can be seen in the iperf output below I started my first test with "-b 686M" flag. However, iperf reported that it was ...
2
votes
1answer
52 views

Is this btrfs snapshot removal performance normal?

I have several boxes running Debian 8, dovecot and btrfs. I'm using btrfs snapshots for short term backup. For this purpose I keep 14 snapshots of the mail subvolume. Performance is OK until it comes ...
1
vote
1answer
27 views

Intermittent Server Performance Degradation Troubleshooting

I have been troubleshooting an intermittent server performance issue for too long and I am running out of ideas. I am looking for any suggestions as to how I might be able to identify the cause of ...
2
votes
1answer
30 views

How to reduce “Connecting” time incurred for a request

I am trying to optimize speed of website and during this process I have found that. A connecting time of around 620ms is incurred everytime I request a page. Please see screenshot below for detailed ...
1
vote
0answers
10 views

Limiting Oracle instances resources with Cgroups?

Is it possible to limit the amount of resources (I/O, CPU and Memory) a Oracle instance can consume using only cgroups? (no containers or virtualization) The reason I wanna do that is because I want ...
1
vote
0answers
16 views

Performance concern with hosting large clustered DBs on VPS cloud servers

I wonder if anybody else bumped into this issue? You get a couple of beefy 12-core VPS instances in some cloud like DigitalOcean and set up a database on them in "active-passive" cluster ...
0
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0answers
15 views

Are changes since snapshots still stored as changelogs?

It's been four years. Is the accepted answer of this question about VMWare still accurate? In other words (in case for some reason that link ever breaks), is this still true? When you create a ...
0
votes
0answers
32 views

ncftp vs common ftp speed

I have very different download speeds with this two ftp clients. Ncftp with standard configuration downlaods at 7MB, while ftp does it at 80MB (connection between dedicated server and FTP Backup ...
1
vote
0answers
30 views

httpd processes cpu spike to 100%+ every xx seconds

My first post, unfortunately due to an issue on my dedicated (Linux Centos 6) server running some personal and one commercial website. Server version: Apache/2.4.18 (Unix) Server built: Mar 7 2016 ...
-1
votes
1answer
25 views

Getting file size before download on a proxy server [closed]

We're working on building a multithreaded proxy file server in C, where we receive a request and retrieve it from another location using the libcurl library. The library gives you the option of ...
1
vote
2answers
39 views

Disk IO Rate: What causes it and what does it mean to me?

I just got a mail from Linode saying that my account "has exceeded the notification threshold (1000) for disk io rate by averaging 1017.36 for the last 2 hours. " My question is just out of curious: ...
3
votes
1answer
64 views

FTP transfers slow on a long fat pipe

We've recently gotten new internet - 100Mb/s fibre - and have been complaining bitterly to our new ISP about transfer speeds to some FTP servers in the USA (300ms away). To one server in particular, ...
0
votes
0answers
11 views

How can I get a nginx & php server to use much more system resources?

I'm running a local setup. Crunching some largish 100mb json files via php running on nginx. I'm also doing some mysql stuff, checking through tables with about 90k rows, matching data from the json ...
0
votes
0answers
15 views

MongoDB high page faults every 15 minutes, delayed readers

We have a relatively small MongoDB production replicaset. We do about 100 operations per second -- balanced reads and writes. Every 15 minutes or so we see a spike in response time on reads, and in ...