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

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0
votes
1answer
379 views

How to speed up QEMU on Windows host?

We want to run our Ubuntu 64bit web server virtualized/emulated on a Windows 64bit host. Intended use is to distribute the VM to customers who might not have "elevated" or "admin" rights on the ...
3
votes
2answers
122 views

Performance associated with storing millions of files on NTFS

Does anyone have a method / formula, etc that I could use - hopefully based on both current and projected numbers of files - to project the 'right' length of the split and the number of nested ...
4
votes
4answers
78 views

Setting the noatime flag for filesystems inside an lxc container

My host filesystem is ext4 mounted with the noatime flag. But inside an lxc-container, the flag is absent. Here's the output of mount on the host: /dev/sdb1 on /home type ext4 (rw,noatime) And ...
0
votes
1answer
102 views

How to improve the speed of FTP directory listing with proftpd on Debian 7.5?

I install proftpd on a VPS running Debian 7.5 hosted on Linode.com. The server location is in California (US) while I am remoting from Singapore. The server is on SSD and I am using ADSL 100Mbs ...
6
votes
0answers
61 views

Fast distributed filesystem for a large amounts of data with metadata in database [closed]

My project uses several processing machines and one storage machine. Currently storage organized with a MSSQL filetable shared folder. Every file in storage have some metadata in database. Processing ...
0
votes
1answer
37 views

Why perfmon for remote desktop servers get an empty file (only time stamp)?

I'm trying to remotely monitor a server using perfmon, the output file is always empty and only the time stamp field is there?
3
votes
1answer
140 views

Why would zfs performance be bad for moving files within an fs?

On my FreeNAS NAS (9.1.1 running zfs v28), I am getting terrible performance for file moves between two directories in the same raidz fs. Is this expected? How can I fault-find this, if not? The ...
0
votes
0answers
279 views

When I should ignore apr_socket_recv: Connection reset by peer (104) in ab test?

I encountered the well-known apr_socket_recv: Connection reset by peer (104) error during my ab test against my server. But I noticed there is a '-r' option in ab which means Don't exit on ...
-1
votes
1answer
71 views

Google Compute Engine VM performance issue [closed]

we have deployed our portal on Google Compute Engine's VM instance. This is a 2 CPU 13 GB Ram with Debian OS. The link to the deployed site is http://www.beawel.com/UGC (Cloud VM). Our testing server ...
0
votes
0answers
333 views

XenServer 6.2 Read Only and Slow Disk I/O

I virtualized a datacenter a few months back and we have a pool of 3 HP DL360 G5 servers, each with 32GB of Memory and dual Intel Xeons. Recently we have been experiencing 2 issues, the first of which ...
1
vote
2answers
96 views

ncq not supported on an SATA3.0 HDD in an usb 3.0 casing

is there a well known reason why a SATA3.0 HDD supporting NCQ does not have NCQ queue depth configured when mounted from an usb 3.0 case ? output for hdparm -iI /dev/sda shows NCQ is supported output ...
0
votes
0answers
30 views

does the number of lvm logical volumes affect ssd performance

Please let me know what your thought are on this. I've installed Ubuntu multiple times on a msata ssd mS200S3 120GB. There is a noticeable decrease of read performance on the exact same hardware for ...
0
votes
0answers
12 views

How to monitor and alert on a program's resource usage Server 2008?

We have a program that at various times utilizes very high CPU and memory. I would like to create a collection of performance logs of this particular application to see a historical trend over time ...
1
vote
0answers
158 views

Network Performance / SMB-CIFS / Guidance

I'm an IT professional working out of my home office. I'm having some performance problems (NAS file copies) which I'm trying to isolate, using iperf. My question is on iperf. Infrastructure - ...
1
vote
0answers
266 views

Sizing of journal disks with Microsoft Storage Spaces parity volume

I'm currently speccing out a new backup server. It's going to be running Windows Server 2012 R2 with Direct Attached Storage, and I'm considering using Storage Spaces rather than using a RAID card. ...
1
vote
0answers
64 views

slow copy due to disk write issue

I am trying to copy a file from /backup/ folder to /backup/abc/ and it is taking a lot of time. The copy operation on performed on other server is pretty fast. # df -HP Filesystem Size Used ...
-1
votes
2answers
40 views

How to meassure disk access [closed]

How can I meassure the disk access on Windows Server 2012? We have some storages attached via iSCI one with SSD and the other not. I would like to compare the disk access speed. In order to figure out ...
-2
votes
1answer
205 views

Why does a low level format take very long time?

I can write ~100MB/s on a particular 4TB SAS drive when it have a file system on it, but a low level format on this drive took >16 hours. That's ~70kB/s. Since there is not filesystem and only zeroes ...
1
vote
1answer
67 views

Poor performance executing “cp -al” over a NFS export

I am in the process of implementing a backup of a WD My Book Live Duo. This device is configured with software RAID0. The backup source directory is the root of the device, and the destination is a ...
0
votes
0answers
38 views

Why is my server so slow to accept connections?

I've noticed that my server seems to be very slow to accept connections - i.e. when analyzing the load time using the Chrome event map, it shows that some tasks can spend multiple seconds waiting for ...
2
votes
2answers
85 views

Lots of major page faults in CentOS

We have a fairly complicated PHP script that's generating a lot of minor and major page faults. $> ps -o min_flt,maj_flt,time,cmd,pid 4686 MINFL MAJFL TIME CMD ...
2
votes
3answers
610 views

sudden peak in cpu usage

We are running a 4 node/machine elastic search cluster on 12 core, 96gb RAM, 4 spinning disk machines. under normal operation most cpu usage is user and around 5-10%. Every few days, one of the ...
-1
votes
1answer
42 views

HDD performance testing over LAN [closed]

Do you know some utility that allow me for HDD performance testing over lan. The issue - I have a shared drive with shared file database. Performance of the database is low and I assume that ...
1
vote
1answer
186 views

How can I diagnose and speed up slow Linux puppet sync?

I'm running puppet and it functions okay, but it's taking about 15 minutes on a sync without any changes, and it seems to me that this shouldn't take more than a minute or two. Here are some stats: ...
1
vote
1answer
135 views

MongoDB - DB/collection fragmentation level

I recently had a performance issue with one of my collections. On a whim (and thanks to this article), I decided to try compacting (as written in the official documentation). This worked brilliantly. ...
0
votes
1answer
56 views

Is there anyway to find what php scripts consume more resources

I want to easily find load cause, Is there a way to display resource usage for php scripts like this. Cpu: index.php 30% something.php 10% ... memory: index.php 50% something.php 10% ..
0
votes
2answers
122 views

Unreasonable performance expectations for RAID 0 performance?

This is my first time building a machine with a hardware RAID card. We bought a Dell T620 with the H710P RAID controller (1GB NV Cache), a 160GB Solid State Drive (SATA Read Intensive MLC 3Gbps), and ...
1
vote
1answer
73 views

MySQL suddenly taking 2000 ms per request, instead of 200

UPDATE: finally remembered to look at munin, and it seems that one of the HDDs is the root of the problem after all, unless I'm totally reading this wrong. Here's the munin output: ...
0
votes
0answers
56 views

SQL Server 2014 Standard 2014 no access and bad preformance

My company looks after a server which is running SQL Server 2014 Standard Edition. The main application database on the server is replicated out to about 20 subscribers. The server has only been in ...
0
votes
1answer
51 views

Perfmon % Processor Time unbalanced

I am somewhat of an accidental DBA, and I'm troubleshooting a SQL Server box where performance has been notoriously poor (as reported by the customer). I was not involved in the initial planning of ...
5
votes
4answers
3k views

How do I configure RAID 5, especially stripe size, with 24 x 1.2 TB drives for CentOS 6?

For a Dell R920 with 24 x 1.2TB disks (and 1TB RAM), I'm looking to set up a RAID 5 configuration for fast IO. The server will be used to host KVM VMs that will be reading/writing files of all sizes, ...
0
votes
2answers
74 views

Very high First Byte Time

A client of mine which I will be completely re-building the site for, is having some major speed issues with the current site. It takes on average 4.4 to 4.8 seconds before the First Byte Time to ...
0
votes
0answers
30 views

How to find out what is blocking requests on Apache2

I'm running a website on Apache 2.4.9 that creates thumbnails of images a lot and when users browse the website they create cca 100 requests per page. Thumbnails are returned by PHP script that has to ...
46
votes
10answers
14k views

How to [politely?] tell software vendor they don't know what they're talking about

Not a technical question, but a valid one nonetheless. Scenario: HP ProLiant DL380 Gen 8 with 2 x 8-core Xeon E5-2667 CPUs and 256GB RAM running ESXi 5.5. Eight VMs for a given vendor's system. ...
2
votes
1answer
44 views

What is the correct way to track and monitor Exchange DB replication “pressure” over time?

I want to determine if some databases are overloaded or unbalanced, and think that looking at the transaction logs created per database over time would tell me which DB is at risk of missing RPO ...
10
votes
2answers
922 views

Why is my RAID1 read access slower than write access?

I have done some simple performance tests and it seems that reading from my RAID1 is slower than writing: root@dss0:~# for i in 1 2 3; do dd if=/dev/zero of=/dev/sda bs=1048576 count=131072; done ...
1
vote
1answer
388 views

6 times slower disk write in RAID10 on Ubuntu 14.04 after rebuild

OS: Ubuntu 14.04 LTS Software Raid 10: 4x120Gb Intel 530 SSDs Initial tests: 1.2 GB/s Write 5.2 GB/s Read I did some tests to check if everything will go alright with a failed disk: I set as ...
1
vote
0answers
1k views

MySQL Workbench InnoDB Buffer Usage at 100%, always

The InnoDB Buffer Usage graph is always at 100%. I believe this started to happen when I changed MySQL's temp folder to a much bigger drive, does that make sense? I suppose the thing to do in this ...
12
votes
7answers
1k views

How do storage IOPS change in response to disk capacity?

All other things being equal, how would a storage array's IOPS performance change if one used larger disks. For example, take an array with 10 X 100GB disks. Measure IOPS for sequential 256kb block ...
0
votes
0answers
56 views

sar -b reports much too high statistics, are the I/O counted twice?

On a Linux server sar -b reports much too high read block statistics, sometimes 3.500.000 readb/s peak and around 2.500.000 readb/s sustain, which makes more that 1 gigabyte/s (according to the sar ...
0
votes
1answer
123 views

pagefile and disk space monitoring on server 2012

I have had a server crash recently because of the disk space. Here is what I have: a Hyper-V 2012 server with 1 win 2012 image physical disk is 500GB server uses 800GB It was OK for half a year but ...
3
votes
1answer
229 views

Upstart: Why two processes when running as a different user?

I want to keep a nodejs app running, so I followed this: http://howtonode.org/deploying-node-upstart-monit and installed Monit and Upstart which have been working perfectly for a couple of months. I ...
3
votes
1answer
272 views

Can rsync display current average speed?

When I'm transferring large quantities of data using rsync, it would be helpful if I could have the average speed up until now at a glance, rather than a bunch of different speeds for each file.
0
votes
1answer
72 views

Performance Monitor for ASP.Net applications

I have an IIS hosted ASP.Net site which is experiencing timeouts. I would like to be able to monitor it from every angle but I'm not sure where to start with configuring PerfMon counters. Does anyone ...
0
votes
0answers
690 views

Server 2012 slow performance on ESXi 5.5

I'm having performance issues with a virtual Server 2012 that is installed on an ESXi 5.5 (HP-ESXi-5.5.0-iso-5.71.3). The hardware server is an HP ProLiant DL380p Gen8. The server 2012 is acting as ...
3
votes
1answer
122 views

Optimal RAID10 configuration for 8 disks and two volumes?

I have an Open-E file server with 8 SAS disks and a MegaRAID 9271-8i controller and I want to configure two logical RAID10 volumes of identical size. One volume has about 66% write access and 33% read ...
2
votes
0answers
90 views

actual disk iops and write merging

/dev/sdb has LVM and exposes a single logical volume, dm-0. While writing to dm-0, /proc/diskstats reports: # of writes completed sdb 29646717 dm-0 131315099 # of writes merged: sdb 101668283 dm-0 ...
3
votes
1answer
35 views

Is it possible to view average system performance/load over time on a default installation of Windows Server?

Without previously configuring collector sets, is there any record of performance metrics kept on a default installation of Windows Server? I have been tasked to evaluate the load on a particular ...
1
vote
0answers
45 views

SMI generation / detection in GRUB / real mode vs. in Linux

I'm trying to get an idea of the frequency and duration of SMI events on a Supermicro X10SAE C226 board (2.0a BIOS) with E3-1245v3 Haswell CPU. The Intel BIOS Implementation Test Suite (BITS) SMI ...
0
votes
0answers
230 views

Strange ASP.NET Queue Performance Counters Behavior?

We have an ASP.NET 2.0 site running in classic mode. I am seeing very strange behavior in the performance counter values. Perhaps these are bugs (I've been all over Google trying to verify this, ...