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

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3
votes
1answer
551 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
34 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
351 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
201 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 zfs-...
7
votes
1answer
213 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
71 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 ...
12
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
46 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
41 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
41 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
322 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
34 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
110 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
38 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
20 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
183 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
63 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
179 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
165 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
621 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
57 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
55 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
558 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
32 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
111 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
50 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
162 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: ...
3
votes
1answer
477 views

CPU is only used 50% on full load on a Windows Server 2012 R2 [closed]

I use Windows Server 2012 R2 on my home server (it's a mini-ITX PC based on an Asrock E350M1/USB3 motherboard, so it's not a strong enterprise server). My problem is that even when I run multiple CPU-...
0
votes
0answers
60 views

The difference in performance of different memory mount in dell poweredge R430

There are 3 servers R430 (S1, S2, S3). All of them have 2 procesors and 8*8GB of ram in slots A1-A4 and B1-B4. There is a need of extending memory. I've read dell recomendations (http://www.dell.com/...
0
votes
1answer
51 views

Is it bad to use swap with SSD when running a server out of memory?

I have DigitalOcean VPS, which has 2GB of memory. I'm soon running or am about to run out of it. How big is the performance hit if I use big swap? DO use SSD has harddrives, and I'm not the one who ...
1
vote
0answers
100 views

Redis parent process smashing disk despite appendfsync = no

We are seeing loads of IO from redis-server despite our save operations being set to occur once every 15 minutes only. The workload is a "full page cache"; we store blobs of compressed HTML. The HTML ...
1
vote
1answer
121 views

Slow file io performance after large network copy on Win7

In a step of our build process we run a tool that generates about 125,000 files. When generation is complete we copy them up to a network share so other systems can copy them down to process further. ...
1
vote
1answer
283 views

Debugging slow server response time [closed]

I'm testing response time of my VPS server: curl -s -w %{time_total}\\n -o /dev/null http://www.example.com The values are typically round 300ms, Google suggests that it should be lower than 200. ...
5
votes
2answers
945 views

Linux: Why does the CPU frequency fluctuate when using the performance governor?

I'm using a Debian 8 amd64 machine for benchmarking. During experimentation, I would like the CPU to operate at a fixed frequency (preferably the maximum possible). This will rule out the CPU clock ...
3
votes
2answers
57 views

Can idle NFS mounts on several clients impact performance

We had a NFS server at work which was working with slight lag. However as more mount points were getting created at several clients(serviced by the same server) we noticed the performance coming to a ...
4
votes
0answers
233 views

HP MSA P2000 G3 Disk Scrubbing performance?

I have a HP P2000 G3 array with two 10Gbit iSCSI controllers in it that presents storage to my virtualisation cluster. It is soon to be expanded with two D2700 shelves each loaded with 25 10k RPM ...
0
votes
0answers
14 views

Conservative Azure Windows VM to Run SQL Server 2008 R2 [duplicate]

For testing purposes I need to set up three Azure Windows VMs to each run an instance of SQL Server 2008 R2 each holding one DB of approx 100GB. There will be quite a few complex stored procedures/...
0
votes
0answers
25 views

Performance monitors

I would need to create a performance monitor on windows server 2012 R2 to monitor the following for a particular period(may be one hour) CPU usage Memory usage Network bandwidth I'm little ...
0
votes
0answers
72 views

Sudden increase in my CPU usage during random moments(Win Server 2012)

At random times, no matter if I am online or not I see that my server having increased Process usage spikes, as you can see in the picture: So I go inside the Dashboard on the Server Manager, look ...
2
votes
3answers
234 views

Apache - drawback to high number of httpd processes always running

Is there any issue with having a high number of spare httpd processes always running? I ran a test where I increased StartServers and MinSpareServers by 1,000 and measured the increase in memory ...
1
vote
0answers
250 views

VMWare ESXi and iSCSI via FreeNAS

I've recently been setting up a sandbox ESXi environment with a VM running FreeNAS providing a volume which is connected as a datastore on the host via iSCSI. I've created a VM on this datastore and ...
2
votes
1answer
850 views

Nginx performance when running multiple instances on the same machine

I'm trying to understand the performance impact of having multiple nginx instances (masters) running on the same machine, rather than having them all load into a single instance using different server ...
-1
votes
1answer
33 views

Is there a way to determine what impact an upgrade will make other than benchmarking it myself? [closed]

Several posts on capacity planning tells me that the only way for me to determine what hardware I need is to test it myself and benchmark it. Benchmark your code on hardware similar to what you'll ...
1
vote
1answer
45 views

RAID1 write penalty using mdadm - what's the cause?

When doing some performance tests writing to a SSD-based 3-way RAID 1 mirror powered by mdadm, it appears we suffer a significant write penalty of about 2.2x slower than doing the same test on just ...
1
vote
2answers
544 views

Can one root server handle over 50M requests per month? [duplicate]

I am running a LAMP Application installed on one server, happily serving about 1M PI per month. Now I am looking into a potential partnership where my app might serve around 50-80M requests per month. ...