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• Opinion choosing Switch

  - by mastercode

  ) i have to reestruct a LAN network, with (currently) +/- 60hosts connected ... i have File Servers hosted, VoIP Phones,wireless AP's,printers, scanners, plotters,biometric dispositive,and 2 QNAP TS412 as FileServer and BackupServer, a Mac Mini as main Server of almost all services that need server ... and, a HP V1910-24 (L2+) and another two switches,but, only L2. which switch in your opinion, could fit better this reestruct, to ensure a VLAN division- and have to support Inter VLAN routing also - provide better performance, and also, allow a Future expansion. the budget, is low xD hehe!!

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• UBUNTU 12.10 loaded. after that boot sector changed from win to grub

  - by Rupam Roy

  After installing Ubuntu 12.10, to my pc and giving a patjh in the external HD, its root dir only went into that and all files on the hd of my PC.Now i required the Ex HD everytime to go to either Win or Linux. I deleted the partition made by linux from disk management of Win, and now want to change the boot sector of my HD of PC back to win. Pc is not starting up and showing Grub failure. I have the original win 7 os. I tried with that going to the command line, but what is the command that takes me to DVD. I ve tried 'cd dvd' and 'cd/ dvd'. Plese help.

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• Openvpn client-to-client connection reencrypted at Server?

  - by user1684411

  currently i'm using a site-2-site openvpn setup. The routers en/decrypt all traffic that goes from one net to another. One of them is the Openvpn server. This works but performance is not as good as possible. I think the limiting factor is the cpu power of the router. Would it be better if i use client-to-client connections and access the fileserver in the one net from a pc in the other, because the openvpn-server does not have to decrypt the (whole) packets?

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• Friend wants to return an iMac with Lion in it. How does he remove his personal info / do clean install?

  - by fakaff

  I have a Mac, but not Lion, and it seems like a lot has changed with Lion. He wants to return the computer. I told him doing a clean install will make it like new, but he says you can't download a bootable disk image from the appstore to do this. He doesn't want to torrent it because he thinks the store will know it's a ripped version. Is there a way for him to remove his Admin account so that none of his personal info remians on the machine?

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• OSX : Setup for filestorage in medium business

  - by Franatique

  In our office every machine runs OSX. In search of an ideal storage and sharing solution we decided to let OSX Server handle all account information and auth requests whereas an 7TB QNAP provides NFS shares. All shares are published as mounts in the companywide LDAP. As it turns out, handling permissions in this situation is very clumsy (e.g. inherit permissions on newly created files). Unfortunately using NFS4 in combination with ACLs did not solve the problem. As a possible solution I set up a iSCSI connection between QNAP and the machine running OSX Server which in turn serves the LUN as AFP share. Permission handling works like a charm for this setup. Although I am a bit concerned about the performance of this setup. As we are a fast growing company we expect the solution to serve at least 100 clients while using files aprox. above 100MB each. Are there any known drawbacks of this solution?

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• How does storage spaces decide where to put my files?

  - by George Duckett

  With Windows 8 Storage Spaces, you can lump many hard disks of varying types, speeds and sizes together to use as a single storage space / logical drive. How does Windows decide what to place where? For example will it move files about depending on frequency of access? Maybe splitting files frequently accessed together between hard disks etc. What does it optimize for? Speed, reliability, etc? If the above is asking too much, can I easily see where the files are physically (on which physical disk)?

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• Extract X11 configuration information from running instance.

  - by kasterma

  Since I had a hard disk die on me, I figured I could easily try some other OS (I usually run Ubuntu). Turns out that Ubuntu flawlessly recognizes my video card and monitor (X11 works right out of the box), and none of the other systems I tried gets anything working (I tried CentOS and FreeBSD). In my now working version of Ubuntu I cannot find a configuration file with information I could try to use with one of the other versions, which makes me guess that it just detects the hardware every time. Can I extract its choice for drivers and configuration options somehow (so I can try these same options in the other systems)?

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• Could 11.5 Million 401's be causing bottlenecks?

  - by roviuser

  I'm going to preface this with a warning: My knowledge about servers and networking is VERY limited, and if you provide me with technical answers, I probably won't understand much until I research your answer further. I'm trying to expand my knowledge and learn about it, though. If the information that I am able to provide in this question is insufficient to answer the question, I understand, and it can be closed. We have a SharePoint 2007 system that is extremely slow, mostly from huge amounts of use. We've been told that the main speed bottleneck is the access to the sql databases. However, they do provide a statistics dashboard, so I did some poking around, and noticed that we have 11.5 million or more 401 - access denied errors every month. Could this be causing major speed/performance decreases? Authentication for sharepoint uses active directory.

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• Vmware peaks NFS load every 30 seconds

  - by gtirloni

  We were troubleshooting a performance problem on one of our storage servers and after investigating almost everything in sight we saw that every 30 seconds, Vmware would go from 10k IOPS (NFS) to 30k, 50k, 100k or whatever the server would handle. Most of it were reads. What could cause this raise in NFS operations per second every 30 seconds? The virtual machines are managed by external customers and there isn't much in common between them. While breaking utilization down by filename, we discovered 5-10 virtual machines that contributed more to those peaks but it still doesn't explain why every 30 seconds. There are no other peaks outside that 30 sec period (ie. it stays in an almost constant average). Is there an NFS tweak in Vmware to change that 30 second period? If that's really necessary, we would like to introduce some variation so all that workload isn't dropped all at once. It's causing NFS timeout on the ESX 3.5/4.0 hosts when the storage gets overloaded.

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• Manual vmware image creation

  - by Gzorg

  A laptop hard disk is being defective, but I managed to be lucky enough to get access to it, using an Ubuntu live cd. Now, I think it would be nice to dump the whole thing, using, for instance, a combination of gzip and split. But that would make the resulting files unusable. I could make a VMware image of it instead. I'm currently looking for the answer, which involves finding how vmware manages fixed size virtual partitions, but maybe you already did this before. Thanks.

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• Provide credentials to process in a safe manner

  - by Erik Aigner

  On system startup I need to launch a process which requires credentials for other services (database etc.) to interact. I obviously don't want to store those on disk for security reasons. I'm trying to think of a way to provide those credentials to the process on launch - and on launch only. After that they should be only available to the process. Is this possible somehow? The bottom line is to make it as hard as possible for an intruder to get to those credentials.

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• cloud hosting with only root partition

  - by user123198

  We are starting a website possibly with couple of thousands hits every day and few thousands registered users. By our hosting provider we were adviced to go with cloud hosting which we can easily expand later if we need. It is Ubuntu 11 running in WM. The problem we run into is the disk is divided only in root and swap partition which is not advised from security point of view. When consulting this with technical support we got the reply that it is not possible to make more partitions and that it is mainly issue with windows server and linux is generally fine. I'm looking here for an advice if we should switch the hosting for perhaps dedicated server where we have the full control or it is something not too be worried about too much.

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• Saving backup files automatically in (g)Vim after saving a file.

  - by Somebody still uses you MS-DOS

  I had a problem with my gVim. I lost some important modifications after I plugged on my machine after a hibernating process. To avoid this kind of problem, I would like to know if it's possible to add something in my .vimrc (or a plugin) that automatically backups all saving made to my files. Disk space is not an issue, I can delete these files after. I'm already using set backup set backupdir=~/.backup/vim set directory=~/.swap/vim This creates a myfile.extension~ in my .backup/vim. ...but I would like this configuration to add ~ to first save, ~0 to second, ~1 to third, ~2 to fourth, and so on - something that keeps copies from all modifications I made to a file. Is this possible? Do you know if there's a plugin for this?

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• Speeding up ping

  - by sam

  We have pretty slow internet which makes working online quite tedious some times the internet is just generally slow, 600ms ping, 0.90mb download. (we are in Londnon, can you beleive). But other times the internet download speed is ok 5-8mb but the ping in 600ms is there a way we can speed this up. Good performance would be 5-10mb 30ms ping at our location, which we sometimes get in the morning. Resetting the router always seem to solve the ping issue for about 10 minutes but then it slows down again, any idea whats governing the ping and if anything can be done to address it ?

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• E: Sub-process /usr/bin/dpkg returned an error code (100)

  - by user67011

  Hello, I am running on xen, Debian 5.0-i386-default. I haven't touched my vps in 2 months then last night I ran the following command: myserver:/usr/bin# apt-get upgrade Reading package lists... Done Building dependency tree Reading state information... Done The following packages have been kept back: makepasswd The following packages will be upgraded: libc6 libc6-dev libc6-xen libmysqlclient15off locales mysql-client mysql-client-5.0 mysql- common mysql-server mysql-server-5.0 10 upgraded, 0 newly installed, 0 to remove and 1 not upgraded. Need to get 0B/50.1MB of archives. After this operation, 483kB of additional disk space will be used. Do you want to continue [Y/n]? y Preconfiguring packages ... E: Sub-process /usr/bin/dpkg returned an error code (100) I googled and it seems to be a permission thing for "dpkg". However, I cd into /usr/bin and there's no dpkg binary!!! Please help thanks

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• For web development which is more important - CPU and Graphics card OR Ram and SSD Harddrive?

  - by adam

  Buying a laptop is always hard work and questions about specific models dont age well on forums. A popular dilema (especially with apple macbooks) is whether to spend more for a faster cpu and graphics card but settle for standard ram and hd OR drop down and spend the savings on more ram and a faster harddrive such as a ssd. Im wondering for web development i.e. ide, unit tests, photoshop work and some user testing screen capturing now and again what would provide better performance. ( No games, music production or spielberg standard video editing.) For examples sake the current apple lineup for their 15inch macbookpros. 2.66 cpu i7 4gb ram 5400rpm drive 4gig ram vs 2.4 cpu i5 8gb ram 124gb sdd roughly the same price.

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• Running Ubuntu off a USB drive?

  - by Solignis

  I was wondering if a USB 2.0 Thumb drive has enough bandwidth to act as a primary system drive in an Ubuntu Linux server. More specifically an SAN server. I am running an iSCSI target, ZFS and NFS-kernel-server, BIND9 (Slave), and Openldap (Slave). I was thinking of resorting to a thumb drive because my new motherboard only has 4 SATA ports and I have 5 disks. 4 (ZFS Pool) 1 (System). And unless I get an expansion card there is no way to get more SATA ports. This "server" leans more twords a home server. I use in my lab with my VMware server. It provides storage, or atleast it did until it died. Would it still be better to go with the SATA hard disk?

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• Move 2TB Win7x64 to 640GB HDD

  - by reedacus25

  Basically I just got a new (refurbished) HP H8-1260t to use for Windows Media Center. The shipping drive is a 2TB Hitachi drive, but I have an older and barely used 640GB WD Caviar Blue 7200RPM drive I would like to move my Windows install to. I have about 750GB of data with over 1TB free left on the drive. Having googled my heart and fingers out, I would think that I can shrink my partition down to the size it is full at now with over 1TB free for a second partition where I can move my media files to further shrink my boot partition so that I can fit a system image smaller than 640GB on that WD drive. I want to have a separate drive for Media and TV Recordings from my boot disk. Does this sound like the easiest method for me? Or am I doing this all wrong. Help appreciated.

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• Why would an ext3 filsystem be rolled back on a Debian VM running in VirtualBox after loss of power to the host

  - by Sevas

  A Debian Virtual machine runs as a Guest VirtualBox VM. It's filesystem is EXT3. The host system loses power and after booting up the host system and guest VM, I find that the VM's filesystem has been rolled back to a previous state, losing changes made to the filesystem some time before losing power. The operations that were rolled back had been fully completed before the loss of power (files fully copied, file handles closed, etc.), but it's possible and even likely that other write operations were occuring on the VM at the point of the crash. So I am trying to figure out if it's the filesystem recovery process that rolls back filesystem operations after encountering corruption post power loss, or is it possibly related to VirtualBox and the way it ignores flush requests for performance gains by default (discussed here) Are there any other factors that would result in the filesystem being rolled back after losing power?

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• How long does it take in practice to warm up large in-memory databases?

  - by Sim

  Companies such as Peak Hosting are offering 64 core machines with 512Gb RAM for $2K/month. This is a very interesting choice for in-memory databases such as Memcached/Redis as well as databases whose performance degrades rapidly when the data & indexes don't fit in RAM, such as MongoDB. My main concern with monster machines such as these is the time it takes to warm up an in-memory database. In my experience, theoretical metrics, e.g., that SATA can load 100Mb/sec, fall short of what happens in practice. Even at that rate, 100Mb/sec means that loading up 512Gb RAM machine from SATA disks can take over 1 1/2 hours (!). I am looking for real-world reports of warm-up times for machines with very large memory. Please, share details of the software on the machine, data size, storage configuration, e.g., SATA or SSD, network, hosting/cloud provider, if relevant, etc.

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• process ksoftirqd consumes permanent 15% CPU load [closed]

  - by markus

  Possible Duplicate: Anyone else experiencing high rates of Linux server crashes during a leap second day? The process ksoftirqd/0 uses permanent 15% CPU on our debian squeeze server. 4 root 20 0 0 0 0 R 15.0 0.0 850:59.17 ksoftirqd/0 I already read that this can have various reason like Full harddisk or high network traffic. In our case we do have more or less low network traffic and enough space on hard disk. How can I analyse what causes ksoftirqd/0 to use permanently 15% CPU?

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• /var/run/utmp is getting large and slowing my server down

  - by Travis

  I removed it and touched an empty verison a few weeks ago and noticed a big upswing in performance for my server. The file was 400+ MB. I've been keeping an eye on it since and I'm noticing it is growing fairly quickly. I tailed the file and I'm seeing a lot of "TTYXXLOGIN" entries. Should I be concerned? Is there a way to minimize it's logging? Should I logrotate it and forget about it? Thanks in advance.

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• Lightweight alternative to R for RHEL?

  - by Eric Rath

  I want to use R for some statistical analysis of logfile information, but found that even the "limited" R-core RPM has a lot of dependencies not already installed. I don't want to install so many packages for a peripheral need. Are there lightweight alternatives for simple statistical analysis on RHEL 6? I have an R script that accepts on stdin a large set of values -- one value per line -- and prints out the min, max, mean, median, 95th percentile, and standard deviation. For more context, I'm using grep and awk to find GET requests for a particular path in our webserver log files, get the response times, and calculate the metrics listed above in order to measure the impact on performance of changes to a web application. I don't need any graphing capabilities, just simple computation. Is there something I've overlooked?

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• Windows 8.1 reset

  - by CreeperInATardis

  I recently had a massive crash on my Windows 8.1 partition, which has rendered it (practically) unusable. I tried to do a refresh, but the problem is, I have a Windows 8 install disk, not 8.1, and thus it didn't work. I also do not have any system restore points/backups of any sort, but I have managed to move my files off. Also, I do not know where my product key is (and cannot find it online), so a clean reinstall would not work. My question is, is there any way to change my Windows 8 disc into an 8.1 disc to allow me to refresh/reset my PC, or is there any other way to do this (aside from repurchasing?) Thanks!

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• Mysql skip-name-resolve

  - by user72459

  I had recently purchased a new server, and transferred all my accounts via WHM Transfer. The problem is that when WHM takes a daily backup, it outputs are message such as DBD::mysql::st execute failed: There is no such grant defined for user 'abc' on host 'myhostname' The problem is solved when I remove skip-name-resolve from my my.cnf file. Tough I dont find any differences in the speed (when I dont add it), it is often mentioned in forums that adding skip-name-resolve optimizes Mysql Performance. Does adding skip-name-resolve really help, if one has a Dedicated server?

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