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

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4
votes
4answers
241 views

Which VM needs more resources?

I have a physical server which runs 8 virtual machines with virt-manager and kvm. Since one VM is not needed any more, I want to give the remaining virtual machines more resources. I'm looking for ...
0
votes
1answer
38 views

Which memory settings to use for this MySQL server? [duplicate]

I've been looking in a lot of places so far but I couldn't find any articles about how much memory to allocate to MySQL based on server size. I am about to deploy a website on a relatively small ...
3
votes
2answers
82 views

Uneven disc throughput in RAID1 configuration

I am having performance issue caused by slow IO in server which has two identical SSDs in RAID1 configuration. By using "atop" noticed that discs usage is no even: DD | md2 | busy 0% ...
1
vote
1answer
253 views

Possible DNS Server memory leak

I have a Windows Server 2012 R2 physical server running AD DS, DNS roles. Very frequently DNS Server process starts consuming a lot of memory. In Task Manager > Details > Analyze wait chain - I ...
0
votes
0answers
19 views

Varnish ESI Streaming Response - Is it possible NOT to stream the response

We use Varnish (4) in front of an application which contains a few ESI blocks. What we are seeing (as expected) is that varnish streams the response from the server as soon as our backend responds to ...
0
votes
2answers
119 views

Reduced performance in mysql after upgrade to 5.6.27

Our application was using MySql version 4.0.24 for a long time. We are trying to migrate it to version 5.6.27. But, on testing the performance on 5.6.27, even the simple selects and updates are 30-40% ...
-4
votes
2answers
60 views

For php webserver, what is faster, 1x 24-core server or 3x 8-core servers? [closed]

Pricing at Dell, it seems I can either get a single R430 or 3x R220's. The R220's would have 4C/8T processors, giving 24 threads. The R430 would have 2x 6C/12T processors giving again 24 threads. For ...
1
vote
0answers
208 views

Spring Boot 1.2.7, Tomcat, CSS and Thymeleaf = Very Very slow service

I have a Spring Boot 1.2.7.RELEASE web application (with Tomcat embedded) which needs to handle a very high load spike, ~ 10k connections in 4 to 5 minutes on one server (there is actually a cluster ...
5
votes
2answers
195 views

Page load long stall times. What is this? [closed]

I have been studying the performance of a website I am building, and notice a curious thing that I can't find the answer to: two requests (always the same two) mysteriously have prolonged stalled ...
1
vote
0answers
16 views

Trend Smart Scan server updates thrash the disk

Every 2 hours, Trend Worry Free business updates Smart Scan. This process requires Trend to thrash through 6 gigabytes of data - this causes two issues The file cache, full of LOB data, is lost and ...
1
vote
0answers
116 views

MySQL overloading CPU at 100%+

My site appears to be getting over 1 million visits today, usually about 20,000 and for me it seems to be near-unresponsive. I've done some sleuthing and optimised Apache, fixed a bug with PHP ...
1
vote
1answer
39 views

HDD seq. read performance

I read the specs for one of the latest Hitachi HDD, https://www.hgst.com/sites/default/files/resources/USC10K1800_ds.pdf . It indicates a speed of SAS 12 Gb/s which is 1.5 GB/s. Is it the sequential ...
1
vote
2answers
30 views

Will a large number of used inodes cause a server to run slowly

I have a server that runs a Magento site. After being alerted that the available inodes were almost completely used up I found that the site had been storing session files and was not removing them. ...
0
votes
0answers
22 views

Read Speed 50% Slower Than Expected

have an issue with our internal network that I’ve been trying to troubleshoot for the past two days with no luck, wondering if I can get any answers or ideas that we haven’t thought of yet. We have a ...
1
vote
1answer
48 views

How to check what is causing performance issue

[Edit] This question is different than what is suggested by the moderator, I am trying to find out what could have caused the API to become slow because of the few lines of codes. I am not trying to ...
1
vote
1answer
238 views

Extremely slow when executing multiple individual MySQL queries

I've been noticing a performance issue in one of my servers running Apache/PHP/MySQL. So I decided to investigate and test it against other servers. What did I do? In three different servers, I ...
0
votes
0answers
16 views

Web Application hangs but static pages through Apache work

I am running. . . Redmine, the ruby web application, on Windows Server 2008, reverse proxy'd from Apache. I am also serving static pages through Apache at the same time. DB is on a separate ...
3
votes
2answers
106 views

Linux raid10 on 2 disks

Linux mdadm has some quirks, one of them is building raid10 with only two disks. There are some reports that it's way faster (twice, both in read and write) as RAID1: ...
3
votes
1answer
389 views

Disk IO Performance Difference — Hyper-V / CSV — Guest vs Host

I have two different Hyper-V 2012 R2 environments that use iSCSI to connect to their virtual machine storage. While the environments are different (one is all 10 GB whereas the other is mixed 1 GB / ...
1
vote
0answers
29 views

Logrotation performance

One question about logrotation on a dedicated webserver (64gb RAM) with apache and mysql. In high load hours (2k users online every moment) we are experiencing a strange behaviour. As an example, at ...
1
vote
1answer
291 views

NetBSD web server performance

I am interesting in the difference web server performance between Linux, FreeBSD and NetBSD since I have heard that NetBSD and FreeBSD have the good TCP/IP implementation. As the result, I setup VMs ...
2
votes
1answer
149 views

ZFS pool slow sequential read

I have a related question about this problem, but it got too complicated and too big, so I decided I should split up the issue into NFS and local issues. I have also tried asking about this on the ...
7
votes
1answer
191 views

Extreme ZFS slowdowns after several months

I've got a general-purpose server, providing mail, DNS, web, databases, and some other services for a number of users. It's got a Xeon E3-1275 at 3.40 GHz, 16 GB ECC RAM. Running Linux kernel 4.2.3, ...
0
votes
0answers
66 views

Performance setup apache 2.4 with 1gb mariadb database

Hi i have vps with Centos 7 with 4gb of ram and 8cores. I have installed mariadb database and apache 2.4. I want run prestashop on it. But I have database which has 1GB so If I want to show for ...
0
votes
0answers
17 views

Can Bind cache a response packet, instead of reconstructing from cached data?

Is it possible to cache the response packets from Bind instead of reconstructing them everytime from cached data? If not, is there any DNS server software that would do this, or are we getting into ...
11
votes
3answers
2k views

What does “low profile” stand for, connected to hardware?

When it comes to hardware I often read something like "Apple Mac computers, and other lower profile ...." For me it sounds like a better word for low end segment hardware but I am not sure about it. ...
2
votes
0answers
41 views

Google Cloud Long TTFB

Google cloud seems to be having much longer TTFB than they specify in their documentation for cloud storage. You can see from this WPT result that it varies from 500 to 700 MS. The documentation here ...
2
votes
1answer
40 views

Archiving bunch of files in the fastest possible way [closed]

I'm implementing a torrent downloading and archiving system. I want to download a torrent file (which contain several small files) and then archive it. My Disk performance is poor. so i want an ...
2
votes
4answers
2k views

Slow write Performance with HP H240 HBA using internal Storage with Raid 5 SSD's

I am having a HP Proliant DL 160 Gen9 Server with a HP H240 Host Bus Adapter. 6x 1 TB Samsung SSD's configured in a raid 5 directly using the internal storage of the machine. After installing a VM on ...
1
vote
1answer
35 views

SVN over SSL: Many reconnects on commit

The SVN server in our company, which is self setup and hosted on EC2, is pretty slow. The setup is based on Apache and mod_dav_svn. There is also a svnserve running that seems to be used by the CI ...
0
votes
1answer
252 views

LSI MegaRaid 9260-8i low performance in comparison

I was given the task (aka dumped into my lap) to examine low Read/Write performance on a system running Server 2012 R2 /w HyperV role. The system in question: Lenovo RD340 LSI MegaRaid 9260-8i (no ...
0
votes
0answers
33 views

How could iptraf-ng be fixing throttled bandwidth?

I'm facing a somewhat funny problem and need some fresh solution ideas to tackle. I've got two servers, both hosted on Hyper-V. One of them is running IPFire with its red0 interface looking straight ...
1
vote
1answer
108 views

Ubuntu LAMP server busy at peak hours

I'm running a Ubuntu 14 server with LAMP on virtual cloud hosting (CityCloud). The server is usually doing very well with response time<0.5s. However, the problems start at peak hours, mainly ...
1
vote
0answers
36 views

xenserver low disk io performance

I have XenServer 6.2 (updates applied XS62E001, XS62E002, XS62E004, XS62E005, XS62E007, XS62E008, XS62E009, XS62E010, XS62E011, XS62E012, XS62E013, XS62E014, XS62ESP1, XS62ESP1002) running a year in ...
1
vote
1answer
18 views

Does orca rrdtool apply any averaging/fudging of graph values?

I have a plot of data that consists solely of zero and one values. However, the orca plot that results shows intermediate values. I wonder why this is.
0
votes
2answers
146 views

Windows Server 2012 Terminal Server Degrading Performance on User Session

We have a terminal server environment with about 40 users which is experiencing a curious performance issue: when a given user logs in initially, everything functions properly, once a particular user ...
1
vote
0answers
48 views

I do a AB Apache Test and it seems good, But when I load my website I get Errors

I have an online shopping website, I use WordPress, WooCommerce and W3 Total Cache. I do a AB: ab -l -r -n 600 -c 30 -k -H "Accept-Encoding: gzip, deflate" And I get the following results: ...
1
vote
0answers
144 views

Performance counter to show real IIS response time

What performance counter should I use to display current average IIS response time? ASP.NET counters correctly show the time spent in ASP.NET, but real latency is much bigger, which is confirmed by ...
1
vote
0answers
144 views

Tuning mdadm RAID 5 performance?

I have a system with dual Intel E5-2620 v3 @ 2.40GHz, 64 GB ram, an LSI 3008 HBA, 8x 1.6 TB Intel S3510 SSDs. I've been playing benchmarking it in different configurations using fio and I've gotten ...
0
votes
0answers
34 views

openvpn bandwidth and ping fluctuations

Good day all I have recently setup an OpenVPN server (which I have done in the past, a few times), this server has a 1 Gbps connection, however using a standard openvpn server/client config, ...
3
votes
1answer
413 views

Bind DNS Recursion Slow

We have just setup a recursive DNS server using the latest stable release of Bind 9.10 We are finding that recursive DNS lookups are quite slow. Anywhere from 1 - 3 seconds. Once the lookup is in ...
29
votes
5answers
4k views

Why does it take tens of seconds to get a shell prompt?

It's a sort of regular occurrence that, after SSHing to a server (or even opening a terminal on my Mac), the login banner prints immediately but it takes ~10 seconds to a minute for the shell prompt ...
0
votes
0answers
16 views

Linux gateway system requirements [duplicate]

I'm the system admin of a small office (6 people). I would like to update our server machine, both software and hardware. We're actually working with a Linux server on an old Pentium Celeron machine, ...
0
votes
2answers
56 views

SQL Server performance

I created a simple website (using C#) that import 70k rows data from a text file to my database but I got this problem: It takes 3 minutes to import 70k rows data to database on my desktop (DELL ...
0
votes
0answers
52 views

Google Compute Engine Poor Multi Core Performance

I am trying to move a simulation from a dedicated i7-4770 machine to Google Compute Engine. The problem being simulated is naturally parallel, with each thread in the simulation executing an ...
1
vote
0answers
482 views

GlusterFS Split Brain issue

I have been facing issues in performance with GlusterFS setup. We took a new build of application live and suddenly all GlusterFS clients and masters also started showing high utilization of CPU. This ...
-2
votes
1answer
29 views

Find a load on my Web Server [duplicate]

As requested, I am asking the question here. Is there a way to find a load on my web application server without a load / stress testing? I have deployed my application in the Apache Tomcat server. ...
0
votes
2answers
100 views

Should I use a server to do multiple services [closed]

I want to ask, I want to build a DNS server, mail server, and DHCP server and possibly an SQL server in my office, the client to this server is less than 100. So, if I have a server, say, with RAM 12 ...
-1
votes
1answer
48 views

Handling the potential risk of writing random bits to storage during power loss with RAID [closed]

Is it possible for a power failure to cause some part of a machine to write one or more random bits to a storage device? Someone proposed the following idea to address such a risk: create multiple ...
1
vote
0answers
139 views

LSI SAS1068E (aka LSI SAS 3442E-R) bandwidth

Recently I connected LSI SAS 3442E-R and two HP SAS 600GB 10k HDD. My motherboard is AsRock Z97 Extreme6. Disk are configured as JBOD, no raid. Linux lspci shows: 0b:00.0 SCSI storage controller: ...