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• KVM guest storage difference with NBD and NFS

  - by WojonsTech

  I am setting up my own little private cloud for my own use maybe for a project or to. I am using linux kvm on debian 6. I have 3 servers 2 of them for compute nodes and 1 storage node. I would I have already installed kvm made a few test machines got my networking setup. I have 2 nics on each server 1 nic is for web traffic other nic is for network traffic. My first Idea was to use NFS for storing the guest machines which can range in size, maybe 8gb maybe 100gb, it just depends. I was doing have heard of nbd before seems like it could work but I dont know what the performance differences are and if it will effect my enviroment, nfs looks like it will be easier to use.

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• What maintenance is required for a Postfix setup?

  - by JonLim

  I've taken a look at the setup and configuration process for a Postfix server, planning to use it for just sending emails out from my server. So far, I have these steps: Setup Postfix Configure Postfix Install DKIM Set SPF records Tune for performance Debug Seems rather straightforward. However, I was just wondering: are there any actions I should be taking for periodic maintenance of my Postfix setup? Thanks! EDIT: Also, just curious, how long would this entire setup ideally take? 30 - 60 minutes? More?

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• Boot.ini on Windows Server 2003 R2

  - by Jason H.

  I have a Windows Server 2003 R2 with 48 GB of RAM; server has been running strong for quite some time. Recently our boot.ini was modified causing issues, most likely by our remote administrators. Now the server is only showing 14 GB of RAM. This has caused major performance issues for our end users. Our remote administrators have stated "we don't change the boot.ini settings(switches)". However, I know for a fact that all of the local administrators have not modified the switches (due to lack of permissions). The real question.. Is it possible to "audit" who has modified the boot.ini? If thats not possible, can the boot.ini be set via startup? Any help would be greatly appreciated. This is an ongoing issue that I would love to resolve.

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• Windows XP occasionally hangs for 2-3 minutes as the splash screen fades in.

  - by marcusw

  This is a bit of a rare problem, I have not been able to debug or fix it or find anyone else with the issue. I hope someone here can help me out. Once in a while, I boot up Windows XP from the first partition of the first disk (using grub, the computer dual-boots ubuntu) and it hangs as the Windows XP splash image fades in, leaving the screen with a dim image of the splash screen. After 2-3 minutes, it continues to boot as normal, no error messages or strange behavior. I have noticed that this happens about 75% of the time when the last time the computer was shut down it was from Ubuntu, and maybe 5-10% of the time otherwise. I have looked at system logs as far as I was able, and did not find anything the miss. What is causing this and how can I fix it?

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• mongodb replication: no primary elected

  - by Max

  I have three servers with mongod installed on it running as a replication set. Suddenly the two secondories became unavailable (the mongod process died) - I think because they were too stale. The problem is that the original PRIMARY is now the SECONDARY and my application doesn't work because it can't connect to a PRIMARY. I mean, in which way does that help me? If the replica set can't do failover?! Am I missing something? Furhtermore I am asking myself why did the SECONDARIES die / why are they too stale? What can I do about it? FYI: My database is quite big (40GB on disk).

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• Turning a running Linux system into a KVM instance on another machine

  - by Charles

  I have two physical machines that I wish to virtualize. I can not (physically) plug the hard drives from either machine into the new machine that will act as their VM host, so I think that copying the entire structure of the system over using dd is out of the question. How can I best go about migrating these machines from their hardware to the KVM environment? I've set up empty, unformatted LVM logical volumes to host their filesystems, with the understanding that giving the VMs a real partition to work with achieves higher performance than sticking an image on the filesystem. Would I be better off creating new OS installs and rsyncing the differences over? FWIW, the two machines to be VM'd are running CentOS 5, and the host machine is running Ubuntu Server 10.04 for no particularly important reason. I doubt this matters too much, as it's still going to be KVM and libvert that matter.

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• FreeNAS 8 and ext fs

  - by oraclecow

  i'm trying out freenas8 for my personal NAS, i have lots of data that was in an ubuntu server, but somehow i never got the file sharing right. on freenas things just worked. i installed on usb, tried sharing the windows disk, and i can see it on my windows 7 right away. my question is, is it ok to use ext4 fs from my ubuntu instalation ? i only saw zfs, ufs, ntfs, and ext2 option to import, i havent plugged in the disks yet, but im wondering the consequences, like if it asked to format like in windows to use. i can format the disks of course, but 5-6 TB of data juggling and reformatting is a lot of work, unnecessary work i think, does the zfs worth the trouble of formatting everything ? since i'm thinking to use it if i have to format it anyway and zfs looks more interesting than ext2.

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• rdesktop remote connect windows server 2012r2, device redirection doesn't work

  - by user197677

  I use rdesktop to connect to a windows server 2012r2 from my linux box. it worked well. but it doesn't work when I redirected my local directory /home to the server. My command: rdesktop -a 24 -r disk:home=/home -u test 192.168.1.110 I could connect to the Windows server. but I cannot see the directory in my remote computer. Running net use x: \\tsclient\home' works when I connect to windows 7, but it yields this error in windows server 2012r2: system error 87 has occure the parameter is error I have no idea what to do. I have turned off the firewall and deployed the RemoteFX to enable device redirection.

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• 8GB, but have to run Windows Xp (32 Bit). Anything I can do with the additional memory?

  - by user12889

  I ordered a new computer with 8GB RAM with the plan to run Windows 7, 64Bit. Turns out now, that I need to run a 32Bit OS (XP or 7) due to some software which does not run on 64Bit yet (not even with any of the available compatibility settings / modes). Is there anything I can do with the memory above 4GB in this scenario? I'm willing to consider creative solutions like running a hypervisor under XP that offers the memory as a RAM-Disk for swapping etc. ? The software that does not run on 64Bit is CISCO VPN (there seems to be a half-working solution for that) and CISCO IP phone / webcam integration "CISCO Unified Video Advantage" (there is apparently no solution for that).

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• If a SQL Server Replication Distributor and Subscriber are on the same server, should a PUSH or PULL subsciption be used?

  - by userx

  Thanks in advance for any help. I'm setting up a new Microsoft SQL Server replication and I have the Distributor and Subscriber running on the same server. The Publisher is on a remote server (as it is a production database and MS recommends that for high volumes, the Distributor should be remote). I don't know much about the inner workings of PUSH vs PULL subscriptions, but my gut tells me that a PUSH subscription would be less resource intensive because (1) the Distributor is already remote, so this shouldn't negatively effect the Publisher and (2) pushing the transactions from the Distributor to the Subscriber is more efficient than the Subscriber polling the Distribution database. Does any one have any resources or insight into PUSH vs PULL which would recommend one over the other? Is there really going to be that big of a difference in performance / reliability / security?

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• Trying to mount an NFS directory from a Mac with another user

  - by Yair

  I have a username on an ubuntu server, lets call it user a. I want to mount a directory from that server to my Mac, on which I have another username, lets call it user b. My problem is that, after I mount the directory (using the disk utility app) I can view files on the server but can't modify or create new files on it. I checked, and if I change the permissions of the server directory so that its open to everyone (chmod 777), I can write to it. So what I need to know, is how can I specify the username and password in the NFS client when setting up the mount? That is, I want to specify that I'm trying to log in as user a to the server.

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• Our company has 100,000s+ photos, how to store and browse/find these efficiently?

  - by tobefound

  We currently store our photos in a structure like this: folder\1\10000 - 19999.JPG|ORF|TIF (10 000 files) folder\2\20000 - 29999.JPG|ORF|TIF (10 000 files) etc... They are stored on 4 different 2TB D-link NASes attached and shared on our office network (\\nas1, \\nas2, and so on...) Problems: 1) When a client (Windows only, Vista and 7) wishes to browse the let's say \\nas1\folder\1\ folder, performance is quite poor. A problem. List takes a long time to generate in explorer window. Even with icons turned off. 2) Initial access to the NAS itself is sometimes slow. Problem. SAN disks too expensive for us. Even with iSCSI interface/switch technology. I've read a lot of tech pages saying that storing 100 000+ files in one single folder shouldn't be a problem. But we don't dare go there now that we experience problems on a 10K level. All input greatly appreciated, /T

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• Windows 8 on iSCSI with LIO target: thin provisioning

  - by LubosD

  I have installed Windows 8.1 on an iSCSI target. This target is provided by Linux LIO and is backed by a sparse file. One of the reasons I created such an installation was thin provisioning. In other words, when I free disk space on Windows, LIO should punch holes into the file, thus free storage space on the Linux server as well. I have checked my kernel's sources and the SCSI UNMAP command is really supported for file-backed targets. On the other hand, deleting files on Windows doesn't lower the amount of space taken by the backing file on Linux (checked with du). Actually, the backing file sometimes grows even more. Some sources on Google say Win8 should support UNMAP/DISCARD on iSCSI, but even in Wireshark I only see ordinary read and write commands when files are being deleted. Any way to fix or troubleshoot it?

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• Apache logging: rotating logs on Win32?

  - by Jason S

  I was noticing my disk space disappearing faster than expected, and finally narrowed it down to a rewrite.log file that was 4 GB in size! Is there a way to rotate the various Apache logs (rewrite, error, access, etc.) on a Win32 PC so that only the most recent entries are there and I can limit the data size that results? I found the bit about log rotation on Apache's website but it's Unix-centric. Edit: I got rotatelogs.exe to work, and it's great except that it slows the server response down noticably so I rejected the idea of using it.

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• KDE Device Notifier and mounted volumes ownership and permissions

  - by nunomaltez

  Hi, When I plug an USB pen to my PC and mount the device using KDE's Device Notifier, the mounted device is owned by my user, who has write permissions. However, when I connect a USB harddisk and mount a partition in the same way, the mounted device is owned by root, and since the owner is the only one with write permissions I can't write to the disk. How do I configure the device notifier's actions to mount the HD with my user as owner, just like it mounts the USB pen? I'm using Fedora 9.

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• Best way to partition 1 TB (Linux and Windows 7)

  - by Simon

  Is there an intelligent way to partition 1 TB and be prepared for resizing/adding/deleting partitions? I was thinking about LVM, but as far as I remember, Windows 7 can't be installed on logical volume right? For now my plan is: - ~150 GB for Windows 7 and other stuff (Visual Studio..., maybe I'll split it 100/50 or something like that) - simple NTFS - 850 GB = LVM - disk for Linux (Ubuntu) and other stuff virtual machines, etc. I'm mostly interested in how and what tools should I use to get easy in maintain partitions for both systems.

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• Squid gives always tcp_miss reverse proxy

  - by JaakL

  I added installed latest squid3 in front of apache as reverse proxy. The problem is that it gives always tcp_miss, in fact I have not yet found a single TCP_HIT message in the log file, and most of the content is static. Relevant config values for cache_dir and refresh_pattern are default ones, directory /var/spool/squid3 exists and has some files/folders. I have 100+G free storage, but reconfigure gives warning "WARNING cache_mem is larger than total disk cache space!", which does not make any sense to me. I have googled a lot and seen with similar problems, but none of them has helped.

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• Snapshots are disappearing from Time Machine. Why?

  - by AntonAL

  I have TimeMachine enabled for my external HDD. I'm triggering backups manually 2 times per week. I have noticed, that some snapshots, that i made, are gone. I noticed this behaviour several weeks later, but i had doubts. To make it sure, i've recorded screen video with listing snapshots in TimeMachine. After watching my screen recording today, I'm sure, that for Augusut i had 9 snapshots. Now, i have only 3 of them. What's happening ? I had no crash disk reports, errors etc

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• Windows 2003 Server - File Permissions

  - by nickstan

  I have a Windows 2003 web server with a tree of folders that contains around 100GB of small images. I need to update the permissions on this folder to add a new user with access. I tried to do this by right clicking on the folder and adding the new user but the process never completed. I left it running for around an hour but it started to heavily impact the peformance of the server. Is there any other way to change these folder permissions without affecting server performance? Many Thanks Nick

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• Flash Player is creating thousands of .tmp files

  - by Ed Manet

  We have seen a number of machines in our environment (XP Pro SP3) that have been running out of disk space because of .TMP files in the windows\temp folder. One machine had 6GB of .TMP files on it starting from around August 2010. The files are all 305kb in size and they seem to get created every 10 minutes. The files appear to be either .EXEs or .DLLs when opened in a hex editor. The words "this program can not be run in DOS mode" are at the beginning of the file and the words "Adobe Flash Player" are scattered all over the end of the file (probably the string table). While it's easy enough to clean them up, I'd like to find root cause for the issue. Has anybody else seen this?

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• Can't boot Windows after installing Linux

  - by user4035

  I have a partition /dev/sdb1, where my old Windows XP resides. All the files are there intact and I can see them, mounting the disk from Linux. Linux is on /dev/sdb2. But when I choose Windows in LILO prompt, it doesn't load. I have the following lilo.conf: boot = /dev/sdb # Linux bootable partition config begins image = /boot/vmlinuz root = /dev/sdb2 label = Linux read-only # Partitions should be mounted read-only for checking # Linux bootable partition config ends # Windows bootable partition config begins other = /dev/sdb1 label = Windows table = /dev/sdb # Windows bootable partition config ends What can be wrong?

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• How to disable screens turn off Windows 8.1

  - by Warpzit

  So recently my computer started turning my screen monitors off after a while without activity, if I move the mouse or hit the keyboard they turn back on. I just want them to stay on. My System is windows 8.1 64 bit, I have 2 screens with mini display port and 1 television with hdmi which often is in regular television mode when this issue happens. Now before you jump to conclusions this is what I've tryed: Disabled screen saver Power saving settings to high with following set: Turn of the display: Never Put the computer to sleep: Never Turn off hard disk after: Settings: Never Sleep: Sleep after: Settings: Never Display: Turn off display after: Settings: Never Display: Enable adaptive brightness: Settings: Off Multimedia settings: When sharing media: Settings: Prevent idling to sleep. Any pointers that get me in the right direction will be greatly appreciated.

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• Why do I see different TCP behaviour between IIS and FTP server applications on Windows 2003?

  - by rupello

  I am comparing Wireshark traces of a 10MB file download file from: the FileZilla FTP server and IIS (using HTTP) on the same Windows 2003 server. The FTP download performs faster and the trace shows the server behaving as expected, sending more data to the client with every ACK received: Link to full-size image The HTTP server trace shows a more bursty pattern. The timing of the send bursts are sometimes unrelated to any ACKs received from the client (circled in red): Link to full-size image Anyone have a suggestion as to why IIS traffic is having like this? Update: We have tried modifying the http.sys registry settings (setting MaxBytesPerSend to 256k and MaxBufferedSendBytes to 64k as recommended). Changing MaxBytesPerSend does seem to improve performance by increasing the amount of in-flight data , but we still see the same bursty pattern.

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• Windows file Sync

  - by Deane Venske

  So I have a big problem at the moment. Trying to find a reliable solution for syncing 2 windows IIS servers. I need to keep the web content imaged on both. Now I have been trying to use Rsync to this point, but unfortunately file permission errors are a nightmare to manage this way. I'm testing out dropbox, but the performance sucks. I'm more familiar with Linux stuff and I've used Rsync in the past but isn't there a native windows solution that will work?

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• Does "I securely erased my drive" really work with Truecrypt partitions?

  - by TheLQ

  When you look at Truecrypt's Plausible Deniability page it says that one of the reasons for partition with solely random data is that you securely erased your drive. But what about the partition table with full disk encryption? How can you explain why the partition table says there's a partition of unknown type (With my limited knowledge of partition tables I think that they store all the partition filesystem types) and with solely random data? It seems that if your going to securely erase the drive you would destroy everything, including the partition table. And even if you just wiped the partition, the partition table would still say that the partition was originally NTFS, which it isn't anymore. Does the "I securely erased my drive" excuse still work here? (Note: I know that there's hidden truecrypt volumes, but I'm avoiding them due to the high risk of data loss)

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