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• sql 2008 disk layout on a budget this is for database mirroring

  - by user22215

  Guys I'm rolling out a SQL database server that will be used to back Sharepoint 2007. Right now I need some advice on my disk layout. I have two Dell servers that are configured a little differently in terms of storage. The principle server will be using a combination of local storage and san storage. I have to work with what I have the organization is currently all allocated on san storage it was like pulling teeth to even get what I have to work with now. My disk setup on the principle is as follows: raid 1 for OS raid 10 for logs raid 10 fiber on san for high IO databases raid 10 sata on san for content databases My question in regards to the principle server is where should I place the temp db? I thought about placing it on the fiber raid 10 which will be hosting my high IO Sharepoint SSP databases my only other choice is to move it to the raid 1 os partition which I’m sure you guys will be against. Now let’s talk about the mirror server it is not connected to the san it is all local 6 15k SAS drives. Now my question is the same do I put tempdb on the os partition or do I leave the os partition and use a single raid 10 for everything? Any help you can provide is much appreciated.

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• Server load high, CPU idle. NFS the cause?

  - by Mech Software

  I am running into a scenario where I'm seeing a high server load (sometimes upwards of 20 or 30) and a very low CPU usage (98% idle). I'm wondering if these wait states are coming as part of an NFS filesystem connection. Here is what I see in VMStat procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------ r b swpd free buff cache si so bi bo in cs us sy id wa st 2 1 0 1298784 0 0 0 0 16 5 0 9 1 1 97 2 0 0 1 0 1308016 0 0 0 0 0 0 0 3882 4 3 80 13 0 0 1 0 1307960 0 0 0 0 120 0 0 2960 0 0 88 12 0 0 1 0 1295868 0 0 0 0 4 0 0 4235 1 2 84 13 0 6 0 0 1292740 0 0 0 0 0 0 0 5003 1 1 98 0 0 4 0 0 1300860 0 0 0 0 0 120 0 11194 4 3 93 0 0 4 1 0 1304576 0 0 0 0 240 0 0 11259 4 3 88 6 0 3 1 0 1298952 0 0 0 0 0 0 0 9268 7 5 70 19 0 3 1 0 1303740 0 0 0 0 88 8 0 8088 4 3 81 13 0 5 0 0 1304052 0 0 0 0 0 0 0 6348 4 4 93 0 0 0 0 0 1307952 0 0 0 0 0 0 0 7366 5 4 91 0 0 0 0 0 1307744 0 0 0 0 0 0 0 3201 0 0 100 0 0 4 0 0 1294644 0 0 0 0 0 0 0 5514 1 2 97 0 0 3 0 0 1301272 0 0 0 0 0 0 0 11508 4 3 93 0 0 3 0 0 1307788 0 0 0 0 0 0 0 11822 5 3 92 0 0 From what I can tell when the IO goes up the waits go up. Could NFS be the cause here or should I be worried about something else? This is a VPS box on a fiber channel SAN. I'd think the bottleneck wouldn't be the SAN. Comments?

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• Distributing entropy to virtual machines.

  - by Louis

  Dear All, I'm interested in generating secret keys for SSL on virtual machines using true randomness. By true randomness I mean the same level of entropy that can be generated by UNIX's dev/random and entropy gathering daemon (EGD). Is there a "general knowledge" recipe to route entropy from the physical layer to the virtual machines via the hypervisor regardless of the Hypervisor/Guest OS combination? Example: suppose one "hypervises" with VMware VSphere and instantiates Windows Guest OS. Can this hypervisor collect entropy from its peripherals (like dev/random/ would) and distribute it to these guest Windows OS? When considering the big vendors (VMware, Hyper-V, Citrix, etc), do they have entropy pools that gather entropy that can easily be pushed to their respective virtual machines? Louis

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• Appears to be "randomly" switching between the acl matched backend and the default backend

  - by Xoor

  I have HAProxy acting as a proxy in front of: An NGinx instance An in-house load balancer in front of multiple dynamic services exposed with socket.io (websockets) My problem is that from time to time my connections are proxied correctly to my socket.io cluster, and then randomly it fallsback to routing to NGinx which obviously is annoying and meaningless since NGinx isn't mean't to handle the request. This happens when requesting for URLs of the format : http://mydomain.com/backends/* There's an ACL in the HAProxy config to match the '/backends/*' path. Here's a simplified version of my HAProxy config (removed extra unrelated entries and changed names): global daemon maxconn 4096 user haproxy group haproxy nbproc 4 defaults mode http timeout server 86400000 timeout connect 5000 log global #this frontend interface receives the incoming http requests frontend http-in mode http #process all requests made on port 80 bind *:80 #set a large timeout for websockets timeout client 86400000 # Default Backend default_backend www_backend # Loadfire (socket cluster) acl is_loadfire_backends path_beg /backends use_backend loadfire_backend if is_loadfire_backends # NGinx backend backend www_backend server www_nginx localhost:12346 maxconn 1024 # Loadfire backend backend loadfire_backend option forwardfor # This sets X-Forwarded-For option httpclose server loadfire localhost:7101 maxconn 2048 It's really quite confusing for me why the behaviour appears to be "random", since being hard to reproduce it's hard to debug. I appreciate any insight on this.

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• ESXi - change to thin - virtual disk filesize is the same

  - by sven

  running ESXi 5.5 here with a datastore on a single SSD. Now, I thought about changing to thin disks from thick and found that I could use a tool on the ESXi host to do that. However, the file size of the new created virtual disk is not changing. I run: vmkfstools -i loader.vmdk -d 'thin' thinloader.vmdk Destination disk format: VMFS thin-provisioned Cloning disk 'loader.vmdk'... Clone: 100% done. After that I compared the virtual disksizes: ls -la *.vmdk -rw------- 1 root root 32212254720 Jun 10 08:25 loader-flat.vmdk -rw------- 1 root root 467 May 21 17:04 loader.vmdk -rw------- 1 root root 32212254720 Jun 10 08:27 thinloader-flat.vmdk -rw------- 1 root root 520 Jun 10 08:33 thinloader.vmdk Stats on the original file: stat loader.vmdk File: loader.vmdk Size: 467 Blocks: 0 IO Block: 131072 regular file Device: 8bf64d175e27544ch/10085333178302026828d Inode: 419443780 Links: 1 Access: (0600/-rw-------) Uid: ( 0/ root) Gid: ( 0/ root) Access: 2014-01-25 10:17:34.000000000 Modify: 2014-05-21 17:04:06.000000000 Change: 2014-05-21 17:04:06.000000000 and on the thin file: stat thinloader.vmdk File: thinloader.vmdk Size: 520 Blocks: 0 IO Block: 131072 regular file Device: 8bf64d175e27544ch/10085333178302026828d Inode: 432026692 Links: 1 Access: (0600/-rw-------) Uid: ( 0/ root) Gid: ( 0/ root) Access: 2014-06-10 08:27:45.000000000 Modify: 2014-06-10 08:33:30.000000000 Change: 2014-06-10 08:33:30.000000000 Anyone an idea why the disk is not providing any more space (tried with multiple VM's already - all the same)? Also, I have noticed that the newly created file "autoappend" "-flat" to the disk ... Thanks Sven Update - diff of the vmdk config* --- loader.vmdk +++ thinloader.vmdk @@ -7,15 +7,17 @@ createType="vmfs" -RW 62914560 VMFS "loader-flat.vmdk" +RW 62914560 VMFS "thinloader-flat.vmdk" ddb.adapterType = "lsilogic" +ddb.deletable = "true" ddb.geometry.cylinders = "3916" ddb.geometry.heads = "255" ddb.geometry.sectors = "63" ddb.longContentID = "6d95855805dfa0079327dfee29b48dca" -ddb.uuid = "60 00 C2 98 d5 7d 17 bf-ac 54 70 b1 2d 39 43 d5" +ddb.thinProvisioned = "1" +ddb.uuid = "60 00 C2 93 c4 13 6c cf-bb 7b 34 c9 2c b4 dc 1e" ddb.virtualHWVersion = "8"

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• pnp4nagios does not generate perfdata

  - by gonvaled

  I am running nagios2, pnp4nagios-0.6.16 and php 5.2.4-2ubuntu5.19. In my setup, pnp4nagios is correctly generating perfdata, which can be seen via the web interface in graphical form for lots of services. The perfdata directory contains entries of the kind: /usr/local/pnp4nagios/var/perfdata/zeus/Disk_Space_Home.rrd /usr/local/pnp4nagios/var/perfdata/zeus/Disk_Space_Home.xml I have activated performance data for a new nagios service: define serviceextinfo { host_name zeus service_description 450average action_url /pnp4nagios/index.php?host=$HOSTNAME$&srv=$SERVICEDESC$ } This service is generating monitoring data in the format: status_info|perf_data as required for performance gathering. But somehow the performance data related to this service is not being collected by pnp4nagios (no related entries in /usr/local/pnp4nagios/var/perfdata) Are there any pnp4nagios scripts or settings which I could use to debug this?

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• Jenkins CI - Cannot allocate memory

  - by Programmieraffe

  I tested jenkins-ci successfully on a ubuntu 10.4 (with vmware fusion) on my local computer. Now I want to install and use it on my virtual server at hosteurope. The basic installation was no problem, but now I have problems with my build project. After pulling an mercurial update from a repository, ant is invoked and throws the following error in my build project: "Buildfile: /var/lib/jenkins/workspace/concrete5-seed-clean/build.xml [property] java.io.IOException: Cannot run program "/usr/bin/env": java.io.IOException: error=12, Cannot allocate memory" There is a known problem with heap size at virtual servers at hosteurope (http://faq.hosteurope.de/index.php?cpid=13918), so I tried to set the heap size manually: # for ant export ANT_OPTS="-Xms512m -Xmx512m" # jenkins # edited /etc/default/jenkins, added line JAVA_ARGS="-Xms512m -Xmx512m" # restarted jenkins via /etc/init.d/jenkins restart After setting this for ant, the command "ant -diagnostics" runs through and does not cause an error, but the error still occurs when I try to build the project. Server-Details: - http://www.hosteurope.de/produkt/Virtual-Server-Linux-L Ubuntu 10.4 LTS RAM: 1GB / Dynamic 2GB My questions: - Is 1GB enough for Jenkins or do I have to upgrade the server? - Is this error caused by ant or jenkins? Update: I got it running with ant options -Xmx128m -Xms128m, but sometimes the error occurs again. (this freaks me out, cause i can not reproduce it by now :/ ) Help much appreciated! Cheers, Matthias

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• Why I cannot copy install.wim from Windows 7 ISO to USB (in linux env)

  - by fastreload

  I need to make a USB bootable disk of Windows 7 ISO. My USB is formatted to NTFS, ISO is not corrupt. I can copy install.wim elsewhere but I cannot copy it to USB. I even tried rsync. rsync error sources/install.wim rsync: writefd_unbuffered failed to write 4 bytes to socket [sender]: Broken pipe (32) rsync: write failed on "/media/52E866F5450158A4/sources/install.wim": Input/output error (5) rsync error: error in file IO (code 11) at receiver.c(322) [receiver=3.0.8] Stat for windows.vim File: `X15-65732 (2)/sources/install.wim' Size: 2188587580 Blocks: 4274600 IO Block: 4096 regular file Device: 801h/2049d Inode: 671984 Links: 1 Access: (0664/-rw-rw-r--) Uid: ( 1000/ umur) Gid: ( 1000/ umur) Access: 2011-10-17 22:59:54.754619736 +0300 Modify: 2009-07-14 12:26:40.000000000 +0300 Change: 2011-10-17 22:55:47.327358410 +0300 fdisk -l Disk /dev/sdd: 8103 MB, 8103395328 bytes 196 heads, 32 sectors/track, 2523 cylinders, total 15826944 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0xc3072e18 Device Boot Start End Blocks Id System /dev/sdd1 * 32 15826943 7913456 7 HPFS/NTFS/exFAT hdparm -I /dev/sdd: SG_IO: bad/missing sense data, sb[]: 70 00 05 00 00 00 00 0a 00 00 00 00 20 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ATA device, with non-removable media Model Number: UF?F?A????U]r???U u??tF?f?`~ Serial Number: ?@??~| Firmware Revision: ????V? Media Serial Num: $I?vnladip raititnot baelErrrol aoidgn Media Manufacturer: o eparitgns syetmiM Standards: Used: unknown (minor revision code 0x0c75) Supported: 12 8 6 Likely used: 12 Configuration: Logical max current cylinders 17218 0 heads 0 0 sectors/track 128 0 -- Logical/Physical Sector size: 512 bytes device size with M = 1024*1024: 0 MBytes device size with M = 1000*1000: 0 MBytes cache/buffer size = unknown Capabilities: IORDY(may be)(cannot be disabled) Queue depth: 11 Standby timer values: spec'd by Vendor R/W multiple sector transfer: Max = 0 Current = ? Recommended acoustic management value: 254, current value: 62 DMA: not supported PIO: unknown * reserved 69[0] * reserved 69[1] * reserved 69[3] * reserved 69[4] * reserved 69[7] Security: Master password revision code = 60253 not supported not enabled not locked not frozen not expired: security count not supported: enhanced erase 71112min for SECURITY ERASE UNIT. 172min for ENHANCED SECURITY ERASE UNIT. Integrity word not set (found 0xaa55, expected 0x80a5)

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• vpn/Openvpn as a cloud service

  - by 8pipe

  I am working on creating a small cloud (any number of EC2 instances that can be deployed based on load) implementing a VPN as a service for the company I'm working for. This is basically a project gathering together various vpn resources under one aegis as a cloud based service. As a user of openvpn, I'm somewhat familiar with being able to connect, but I'm looking for resources to start this project. Essentially I need to be able to: run a certificate authority and manage keys to distribute to coworkers build an ami that handles openvpn as a service balance the load if necessary among machines instances as needed Any suggestions for tutorials, things to avoid, roadblocks I might not be seeing from a novice perspective, etc. or just help in visualizing this is appreciated.

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• What is causing sudden freezing during running real-time program?

  - by Trevor Boyd Smith

  So I run a high intensive (CPU/GPU) real-time program. During normal execution suddenly everything freezes for 1-4 seconds. I opened "Process Explorer" in the background to help gain insight and maybe identify something. Here is what the CPU/GPU graphs looks like when I align them in time: Notice the 4 distinct drops in both the CPU/GPU. You can see that it goes from some sort of positive CPU/GPU usage to almost zero. These drops in the graph align with when the real-time program suddenly freezes. How do I find what is causing these sudden drops? NOTE: When you put your mouse over the graph it tells you the time, accurate to the second, for where your cursor is. Maybe this mouse over feature could be helpful in some way (e.g. what if you had a log of all processes every 100ms). EDIT: The real-time program is a video game and so I can't watch some sort of instrumentation while the video game is running. I need a solution that let's you look back in time somehow to see what was happening when the slow down occurred. EDIT: RE - Recording Data vs using real-time monitor: So the windows performance recorder is for some reason not recording what I expect it to record. So I switched to using "perfmon" and then opening it's "resource monitor". RE - Setting it up so I can view real-time monitor: In the video game I set it to spectate and then put the video game in "windowed" mode so that I can view the real time display that Resource Monitor has. Now that I can get semi-real time (only once per second... how do you get more than once per second?) I started looking at the various real time data readouts. Getting to the cause: I noticed a strong correlation in high disk IO and low CPU usage (which is also seen by having in-game freezing). How do you use resource monitor to find out who is doing all this offending disk IO?

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• Allowing non-admin users to unstick the print spooler

  - by Reafidy

  I currently have an issue where the print que is getting stuck on a central print server (windows server 2008). Using the "Clear all documents" function does not clear it and gets stuck too. I need non-admin users to be able to clear the print cue from there work stations. I have tried using the following winforms program which I created and allows a user to stop the print spooler, delete printer files in the "C:\Windows\System32\spool\PRINTERS folder" and then start the print spooler but this functionality requires the program to be runs as an administrator, how can I allow my normal users to execute this program without giving them admin privileges? Or is there another way I can allow normal user to clear the print que on the server? Imports System.ServiceProcess Public Class Form1 Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click ClearJammedPrinter() End Sub Public Sub ClearJammedPrinter() Dim tspTimeOut As TimeSpan = New TimeSpan(0, 0, 5) Dim controllerStatus As ServiceControllerStatus = ServiceController1.Status Try If ServiceController1.Status <> ServiceProcess.ServiceControllerStatus.Stopped Then ServiceController1.Stop() End If Try ServiceController1.WaitForStatus(ServiceProcess.ServiceControllerStatus.Stopped, tspTimeOut) Catch Throw New Exception("The controller could not be stopped") End Try Dim strSpoolerFolder As String = "C:\Windows\System32\spool\PRINTERS" Dim s As String For Each s In System.IO.Directory.GetFiles(strSpoolerFolder) System.IO.File.Delete(s) Next s Catch ex As Exception MsgBox(ex.Message) Finally Try Select Case controllerStatus Case ServiceControllerStatus.Running If ServiceController1.Status <> ServiceControllerStatus.Running Then ServiceController1.Start() Case ServiceControllerStatus.Stopped If ServiceController1.Status <> ServiceControllerStatus.Stopped Then ServiceController1.Stop() End Select ServiceController1.WaitForStatus(controllerStatus, tspTimeOut) Catch MsgBox(String.Format("{0}{1}", "The print spooler service could not be returned to its original setting and is currently: ", ServiceController1.Status)) End Try End Try End Sub End Class

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• Getting the number of frames from a video in Android

  - by Jay Patel

  I want to get the number of frames from a video. I'm using the following code: package com.vidualtest; import java.io.File; import java.io.FileDescriptor; import android.app.Activity; import android.graphics.Bitmap; import android.media.MediaMetadataRetriever; import android.os.Bundle; import android.os.Environment; import android.widget.ImageView; public class VidualTestActivity extends Activity { /** Called when the activity is first created. */ File file; ImageView img; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); img = (ImageView) findViewById(R.id.img); File sdcard = Environment.getExternalStorageDirectory(); file = new File(sdcard, "myvid.mp4"); MediaMetadataRetriever retriever = new MediaMetadataRetriever(); try { retriever.setDataSource(file.getAbsolutePath()); img.setImageBitmap(retriever.getFrameAtTime(10000,MediaMetadataRetriever.OPTION_CLOSEST)); } catch (IllegalArgumentException ex) { ex.printStackTrace(); } catch (RuntimeException ex) { ex.printStackTrace(); } finally { try { retriever.release(); } catch (RuntimeException ex) { } } } } In getFrameAtTime() I'm passing different static time values like 10000, 20000, etc. in milliseconds, but still I'm getting the same frame from the video. My goal is to get different frames with a different time interval.

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• Tools for analyzing performance of SQL Server/Express?

  - by Adam Crossland

  The application that I have customized and continue to support for my client is seeing dramatic performance problems in the field. Simple queries on rather small datasets take over a minute when I would expect them to complete with sub-second times. My current theory is that SQL Server Express 2005 is too limited for the rather non-trivial demands being made of it, but I am not sure how to get about gathering data that I can use to either prove my point or allow me to move on to finding another cause. Can anyone point me toward some tools that would allow me to analyze the load on this database? Information such as simultaneous connections, execution times of individual queries, memory usage, heck just any profiling data at all would be a help. Many thanks.

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• Drivers and Codec Compilations

  - by Pennf0lio

  Hi, Do you know any software or compilations that you recommend to handle drivers and codecs for newly formated computer? I am having problem gathering drivers and codecs when I format my computer or other's computer because we frequently misplace it's original drivers. I need an offline solution that doesn't need internet. Same for as the codec, when formating computer we frequently lost our codecs, are there codec packs you know that you would like to recommend? P.s. I had tried driver bot but it's only good when your online, I'm looking for a complete package that has all the driver to most common hardware (eg. Monitor, Sound, etc). Thanks!

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• Active Directory: trouble adding new DC

  - by ethrbunny

  I have a domain with 3 DCs. One is starting to fail so I brought up a new one. All are running Win 2003. Problem: there appear to be replication issues between the 4 machines but I can't figure out what's causing this. All are registered with the DNS as identically as I can make them. How do I know there is a problem? Nagios is telling me that the other 3 DCs are having KCCEvent errors and the new machine is reporting "failed connectivity" errors. Doing dcdiag on the new machine reports: the host could not be resolved to an IP address. This seems crazy as I log into it using the DNS name. I can ping it from the other three machines using this DNS name as well. repadmin /showreps from the new machine says its seeing the other 3 machines. Doing the same from one of the older machines doesn't show the new machine. I've tried netdiag /repair numerous times. No luck. There are no firewalls running on any of the machines. If I look at Domain info via MMC (on the new machine) it appears that all the information is current. Users, computers, DCs.. its all there. Im puzzled as to what step(s) I've missed in adding this new machine. Suggestions? EDIT: dcdiag from non-working: C:\Documents and Settings\Administrator.BME>dcdiag Domain Controller Diagnosis Performing initial setup: Done gathering initial info. Doing initial required tests Testing server: Default-First-Site-Name\YELLOW Starting test: Connectivity The host 312ce6ea-7909-4e15-aff6-45c3d1d9a0d9._msdcs.server.edu could not be resolved to an IP address. Check the DNS server, DHCP, server name, etc Although the Guid DNS name (312ce6ea-7909-4e15-aff6-45c3d1d9a0d9._msdcs.server.edu) couldn't be resolved, the server name (yellow.server.edu) resolved to the IP address (10.127.24.79) and was pingable. Check that the IP address is registered correctly with the DNS server. ......................... YELLOW failed test Connectivity Doing primary tests Testing server: Default-First-Site-Name\YELLOW Skipping all tests, because server YELLOW is not responding to directory service requests Running partition tests on : Schema Starting test: CrossRefValidation ......................... Schema passed test CrossRefValidation Starting test: CheckSDRefDom ......................... Schema passed test CheckSDRefDom Running partition tests on : Configuration Starting test: CrossRefValidation ......................... Configuration passed test CrossRefValidation Starting test: CheckSDRefDom ......................... Configuration passed test CheckSDRefDom Running partition tests on : bme Starting test: CrossRefValidation ......................... bme passed test CrossRefValidation Starting test: CheckSDRefDom ......................... bme passed test CheckSDRefDom Running enterprise tests on : server.edu Starting test: Intersite ......................... server.edu passed test Intersite Starting test: FsmoCheck ......................... server.edu passed test FsmoCheck dcdiag from working: P:\>dcdiag Domain Controller Diagnosis Performing initial setup: Done gathering initial info. Doing initial required tests Testing server: Default-First-Site-Name\AD1 Starting test: Connectivity ......................... AD1 passed test Connectivity Doing primary tests Testing server: Default-First-Site-Name\AD1 Starting test: Replications ......................... AD1 passed test Replications Starting test: NCSecDesc ......................... AD1 passed test NCSecDesc Starting test: NetLogons ......................... AD1 passed test NetLogons Starting test: Advertising ......................... AD1 passed test Advertising Starting test: KnowsOfRoleHolders ......................... AD1 passed test KnowsOfRoleHolders Starting test: RidManager ......................... AD1 passed test RidManager Starting test: MachineAccount ......................... AD1 passed test MachineAccount Starting test: Services ......................... AD1 passed test Services Starting test: ObjectsReplicated ......................... AD1 passed test ObjectsReplicated Starting test: frssysvol ......................... AD1 passed test frssysvol Starting test: frsevent ......................... AD1 passed test frsevent Starting test: kccevent ......................... AD1 passed test kccevent Starting test: systemlog ......................... AD1 passed test systemlog Starting test: VerifyReferences ......................... AD1 passed test VerifyReferences Running partition tests on : Schema Starting test: CrossRefValidation ......................... Schema passed test CrossRefValidation Starting test: CheckSDRefDom ......................... Schema passed test CheckSDRefDom Running partition tests on : Configuration Starting test: CrossRefValidation ......................... Configuration passed test CrossRefValidation Starting test: CheckSDRefDom ......................... Configuration passed test CheckSDRefDom Running partition tests on : bme Starting test: CrossRefValidation ......................... bme passed test CrossRefValidation Starting test: CheckSDRefDom ......................... bme passed test CheckSDRefDom Running enterprise tests on : server.edu Starting test: Intersite ......................... server.edu passed test Intersite Starting test: FsmoCheck ......................... server.edu passed test FsmoCheck P:\>

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• Cannot SSH into Amazon EC2 instance

  - by edelwater

  I read: Cannot connect to ec2 instance http://stackoverflow.com/questions/5635640/cannot-ssh-into-amazon-ec2-instance Amazon EC2 instance ssh problems etc... But could not fix it: suddenly (after a year of service, no changes on my winscp settings) it gives me "network error connection timed out" (im using ec2-user) (also from the amazon console). Log FILE: http://pastebin.com/vNq6YQvN All Sites that run on it run fine port 22 is allowed (never changed it) (security group) using the correct ec2-user and domain via my winscp / putty i can connect to other hosting (via ssh) update: SOLVED. I spend 2 days without looking at my own IP address .... (since it did not change the past 3 years....). Your comments made the spark in my brain. thank you so much. (and only now i find dozens of discussions from angry users that the static addresses from my provider are changed to dynamic ones: http://gathering.tweakers.net/forum/list_messages/1501005/12 ...)

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• High load on a nagios server -- How many service checks for a nagios server is too many?

  - by Josh

  I have a nagios server running Ubuntu with a 2.0 GHz Intel Processor, a RAID10 array, and 400 MB of RAM. It monitors a total of 42 services across 8 hosts, most of which are checked using the check_http plugin even 5 minutes, some every minute. Recently the load on the nagios server has been above 4, often as high as 6. The server also runs cacti, gathering statistics every minute for 6 hosts. I wonder, how many services should hardware like this be able to handle? Is the load so high because I am pushing the limits of the hardware, or should this hardware be able to handle 42 service checks plus cacti? If the hardware is inadequate, should I look to add more RAM, more cores, or faster cores? What hardware / service checks are others running?

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• Server not accepting uploads

  - by Tatu Ulmanen

  I'm having a strange problem with my VPS: I can download files from it, I can use PuTTy to connect to it and all behaves normally. But sometimes, when I try to upload a file to the server or save a file via SFTP, the connection inexplicably fails. I am using jEdit to edit files remotely via SFTP. When it works, it works fine. When it doesn't, I get an error message: Cannot save: java.io.IOException: inputstream is closed Cannot save: java.io.IOException: 4: I can see that a temporary save file (#file.php#save#) is created on the server with a filesize of 0. So the connection works, but when it comes to sending the actual data, something fails. The same thing with WinSCP, but the error is different: Copying file fatally failed. Copying files to remote side failed. And I can always browse the server with PuTTy without a problem. I see nothing abnormal in any log files. Auth.log shows this when I try to save: sshd[32638]: Accepted password for - from - port 62272 ssh2 sshd[32638]: pam_unix(sshd:session): session opened for user - by (uid=0) sshd[32640]: subsystem request for sftp sshd[32638]: pam_unix(sshd:session): session closed for user - When I wait for a while (say, an hour), everything works fine again. It can't be a temporary ban, as I am still allowed to connect to the server, right? I know this may not be enough info to solve the problem, but I am grateful for any clues or bits of information that might help me. What are the possible causes for this kind of behaviour, what log files can I check for clues etc.. I'm running out of ideas!

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• Does a successful exit of rsync -acvvv s d guarantee identical directory trees?

  - by user259774

  I have two volumes, one xfs, and another ntfs - ntfs was empty, and xfs had 10 subitems. I needed to sync them. I initially copied a few of the subitems by dragging them over in a gui fm. Several of the direct descendants which i had dragged finished, apparently. One I stopped before it was done, and the rest I cancelled while it still appeared to be gathering information about the files. Then I ran rsync -acvvv xmp/ nmp/, where xmp and nmp are the volumes' respective mountpoints, which exited with a 0 status. find xmp -printf x | wc -c and find nmp -printf x | wc -c both return 372926. My question is: Am I guaranteed that the two drives' contents are identical?

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• How do I find the cause for a huge difference in performance between two identical Ubuntu servers?

  - by the.duckman

  I am running two Dell R410 servers in the same rack of a data center. Both have the same hardware configuration, run Ubuntu 10.4, have the same packages installed and run the same Java web servers. No other load. One of them is 20-30% faster than the other, very consistently. I used dstat to figure out, if there are more context switches, IO, swapping or anything, but I see no reason for the difference. With the same workload, (no swapping, virtually no IO), the cpu usage and load is higher on one server. So the difference appears to be mainly CPU bound, but while a simple cpu benchmark using sysbench (with all other load turned off) did yield a difference, it was only 6%. So maybe it is not only CPU but also memory performance. I tried to figure out if the BIOS settings differ in some parameter, did a dump using dmidecode, but that yielded no difference. I compared /proc/cpuinfo, no difference. I compared the output of cpufreq-info, no difference. I am lost. What can I do, to figure out, what is going on?

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• Find which files an apache process is writing to?

  - by Haluk

  We have this apache process which becomes io-bound time to time. Using atop, we can see it is a write operation. Using lsof -p <PID> we can see a list of files open by the httpd process. First we thought "log" files must be the problem. So we turned them off just to test. However write operations still continues. We will continue testing a few other things. For instance we use php session variables a lot. Maybe php session files are getting all the writing. But is there a way to quickly identify files which get written to by the httpd process? This way we can focus our efforts on those files. UPDATE: We used the strace command as suggested. Here are two lines from the output. write(23, "\27\0\0\0\3SET CHARACTER SET utf8", 27) = 27 write(23, "\17\0\0\0\3SET NAMES utf8", 19) = 19 We do not have a mysql process on this server. So is strace also showing what is being written to an ethernet port? UPDATE2: During high io load, the process which consumes most of the write resources gives the following output to strace -e trace=write -p <PID>: --- SIGCHLD (Child exited) @ 0 (0) --- write(9, "!", 1) = 1 write(19, "OPTIONS * HTTP/1.0\r\nUser-Agent: Apache (internal dummy connection)\r\n\r\n", 70) = 70 However I cannot figure out where these are being written to.

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• What are the typical methods used to scale up/out email storage servers?

  - by nareshov

  Hi, What I've tried: I have two email storage architectures. Old and new. Old: courier-imapds on several (18+) 1TB-storage servers. If one of them show signs of running out of disk space, we migrate a few email accounts to another server. the servers don't have replicas. no backups either. New: dovecot2 on a single huge server with 16TB (SATA) storage and a few SSDs we store fresh mails on the SSDs and run a doveadm purge to move mails older than a day to the SATA disks there is an identical server which has a max-15min-old rsync backup from the primary server higher-ups/management wanted to pack in as much storage as possible per server in order to minimise the cost of SSDs per server the rsync'ing is done because GlusterFS wasn't replicating well under that high small/random-IO. scaling out was expected to be done with provisioning another pair of such huge servers on facing disk-crunch issues like in the old architecture, manual moving of email accounts would be done. Concerns/doubts: I'm not convinced with the synchronously-replicated filesystem idea works well for heavy random/small-IO. GlusterFS isn't working for us yet, I'm not sure if there's another filesystem out there for this use case. The idea was to keep identical pairs and use DNS round-robin for email delivery and IMAP/POP3 access. And if one the servers went down for whatever reasons (planned/unplanned), we'd move the IP to the other server in the pair. In filesystems like Lustre, I get the advantage of a single namespace whereby I do not have to worry about manually migrating accounts around and updating MAILHOME paths and other metadata/data. Questions: What are the typical methods used to scale up/out with the traditional software (courier-imapd / dovecot)? Do traditional software that store on a locally mounted filesystem pose a roadblock to scale out with minimal "problems"? Does one have to re-write (parts of) these to work with an object-storage of some sort - such as OpenStack object storage?

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• Application that will identify percentage of your system disk bandwidth used on a user-application by user-application basis?

  - by Warren P

  I always (subjectively) feel my computer is far too slow (however fast it is), and so I'm always looking for ways to measure and understand what my computer is actually doing, that is making it seem "slow" to me. It has been my observation that my software-developer workload is most often disk-bound (I am waiting for Disk I/O) more than CPU bound. What has made it worse, is that I am using a corporate PC that has in-memory active-scanning anti-virus software that I do not have control over, and also some IT department mandated services that seem to suck up a lot of available hard-disk bandwidth. The best tool I have seen (in Windows 7) is the Resource Monitor which I usually acess from the button in the task Manager. The disk IO page, however, seems to label Disk Activity at a very low level (for example, showing the Volume Shadow Storage, which is flushing information obviously written by something ELSE other than VSS itself, and then writes to Pagefile.sys, which are obviously due to Virtual Memory faults in some application). What I would like to know is if a utility exists that can add up all direct disk input and output by user-level process, or find the process or service that caused VM or VSS activity. In that way, I hope, you could establish a real idea of how much of your computer's precious disk subsystem bandwidth is attributable to a particular application. here's a scenario: MyApp.exe writes 100k/s and reads 100k/s directly. VSS ends up writing another 100k/s. pagefaults caused inside MyApp.exe cause another 100k/s of writes. So the total "cost" of MyApp.exe running, during a period of time (let's say 1 second) is 400k/s, whereas you can only directly observe half of that, in Resource Monitor. Is there a smarter disk-IO watching piece of software I can use?

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• Identify what's painting the empty space in my Windows notification area?

  - by lance

  I have an "icon" in my Windows (XP, if it matters) notification area (by the clock) which renders no image, but rather an empty square space (no borders -- nothing rendered at all in the space where you'd expect an icon). Upon mousing over this space, it immediately collapses (disappears), preventing me from gathering any information about it. I'm assuming the collapse (on mouseover) indicates the process is no longer running. How can I learn what process is painting this "void" in my notification area? I don't control the workstation, so I can't control what launches when.

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• Can the Nikon D50 be hacked to record video?

  - by andy

  I mean hacked in terms of software only, and minor hardware hacking if necessary, without of course breaking the camera. Also, if possible, video should be able to be recorded at an acceptable frame rate, around 20fps. thanks p.s. Reason for this question: Just to give some context before people tell me to buy a new camera! For still photography I now almost exclusively shoot film with a Nikon F3, and my D50 is gathering dust. I want to shoot some video of my Capoeria classes, for personal use, and thought maybe I could put my D50 to good use. Yes, I could buy a D5000 or older D90, but really I just want to shoot some video with my nice wide Nikkor lenses at no extra cost!

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