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  • How does BTRFS compare to ZFS?

    - by Zubair
    I am considering which OS and filesystem to use on some new servers I have and am considering either Free BSD with ZFS, or Linux with BTRFS. The programs I have run on both systems, so the only issue is reliability of the filesystems and performance, etc.

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  • How do I mount an Exchange mail store from the Windows Command Line?

    - by Cypher
    Our Exchange server is running Exchange Server 2003 Standard on the Windows Server 2003 platform. We're dealing with the mail store size issue, where if the mail store goes over the limit, it gets dismounted. While we are working with the powers-that-be on a policy that will prevent this happening in the future, I would like to see if it is possible to re-mount the mail store via the Windows CLI. I'm already monitoring the Event Logs and alerting on mail store warnings and dismounts - I'm just tired of getting up at 5am to manually re-mount the store while the political wars ensue. My alerting tools have the ability to execute a batch script when an alert is generated. I would greatly prefer a native CLI option. I'm not too keen on running some random vbscript found on the Internet and I don't really care to spend my time debugging someone else's code. PowerShell might be an option, if it can be triggered from the CLI.

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  • Unable to ping remote server Nagios

    - by williamsowen
    We've recently set up Nagios on one of our Amazon EC2 instances to act as a monitoring server to our other instances. nrpe was installed on our staging server stager and appears to be working fine: monitoring_server~: /usr/lib/nagios/plugins/check_nrpe -H xx.xx.xx.xx -p 5666 NRPE v2.12 The issue is - when viewing the remote server stager within the Nagios admin screen - it appears to be 'DOWN'. The check_ping command reveals: monitoring_server~: /usr/lib/nagios/plugins/check_ping -H 'xx.xx.xx.xx' -w 5000,100% -c 5000,100% -p 1 PING CRITICAL - Packet loss = 100%|rta=5000.000000ms;5000.000000;5000.000000;0.000000 pl=100%;100;100;0 Can anyone provide some direction on how to get this working? Not sure what else to do

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  • Connection Filtering with Multiple DNSBL's?

    - by JohnyD
    Is there any advantage or disadvantage to using multiple DNSBL's with ones connection filtering? I just switched from SpamHaus to BarracudaCentral but have added in SpamHaus to test for increased effectiveness. So far there is no dip in performance and no increased load on our SMTP server.

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  • How to get started setting up IP security cameras

    - by dave
    I have just finished renovating my house. As part of the job, I have cat6 cable run through the house, including two external plugs. All cables terminate in the same location. My rough plan is to plug two IP cameras to monitor the front and rear, run POE from a central router to the two external cameras, plug my PC into the same router and run magic software X. Any machine plugged into the router or wirelessly connection should then be able to get a live feed and alerts based on motion detection. That's the plan, but I'm not sure how possible it is. What hardware to get and what monitoring software to get. Has anyone does something similar? What were your experiences?

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  • How to fix Windows 2008 R2 show less memory than available

    - by eugeneK
    I've got Win2008 R2 64bit installed on Dell R410 server with 8GB of RAM. Dell Open Manage shows 8GB total and 4GB available for use, In Windows Control Panel, System i see 64bit and 8GB of RAM while in Windows Task Manager at Performance tab there is 4GB of memory available. Dell support has made some checks and told me that if BIOS shows 8Gb of RAM and indeed BIOS does then it's operational system issue. Tried to search online for resolution but none found. Please help, thanks

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  • How to maintain a SSD drive on Ubuntu ?

    - by Julien Nicoulaud
    I am running Ubuntu 10.04 on a Intel X25-M PostVille 160 Go SSD drive. How can I tell if there's something wrong ? What should/can I do to maintain its performance/health ? Should I use TRIM and how often ? This may look as a duplicate of this question, but I am more asking in term of good practices and learning how to use this new technology the right way...

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  • Set up a root server using Ubuntu and Virtualization

    - by Daniel Völkerts
    Hello, I'd like to setup a fresh root server and install a linux based virtualization on it. My thoughts are on: Intel VTs Hardware Ubuntu 9.10 KVM based virt. The access to the root server will only be SSH for Administration. Has anybody done this before, what was your glues discovered in the daily use? My requirements are: very secure, so the root server only has ssh to the dom-0 and minimalistic ports for the guest (e.g. http/s). good monitoring of host/guest (my idea is to using zabbix for it) easy and fast administration (how are the command line tools working for you? cryptiv? high learning curve?) I'm pleased to learn from your suggestions. Regards, Daniel Völkerts

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  • Which is a better use of my SSD Drive [on hold]

    - by RS Conley
    I have the choice of setting up a system with two SSD Drives in Raid 1 mode as my boot drive for Windows 7 64-bit. With the Program Files and User Folders moved to a Second regular HD Drive also configured using Raid 1. Or Setup a single SSD Drive (120 GB or 256 gb) as a cache Drive using Intel Rapid Storage Technology combined with two normal hard drives configured as Raid 1. Which setup would have the faster hard drive performance over the life of the computer?

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  • OSS Router firmwares

    - by Cherian
    DD-WRT, Open WRT , Tomato or Third-party firmware projects ? What are the compelling reasons to choose between these? I used to be a great DD-WRT fan until I realized that the author was deceiving users by publishing it as a OSS, but made it very cumbersome to download the source and change it (requires you to download GB’s of source files) .Also their bandwidth monitoring feature was part of the paid version, which IMHO is a killer. Having said that, DD-WRT just worked. And I think that’s great..

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  • Is memcache impacting my performence negatively?

    - by iTech
    I am using pressflow 6 and NewRelic seems to suggest that memcache is infact hurting performance as shown below : My settings.php file : # Varnish reverse proxy on localhost $conf['reverse_proxy'] = TRUE; $conf['reverse_proxy_addresses'] = array('127.0.0.1'); # Memcached configuration $conf['cache_inc'] = './sites/all/modules/memcache/memcache.inc'; $conf['memcache_servers'] = array( '127.0.0.1:11211' => 'default', ); ### END Mercury settings written on 2011-11-01T07:12:49-04:00

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  • Why is the Task Manager Total Physical Memory not 2048 MB or 2 GB

    - by Dorothy
    I found 3 numbers for the Total Physical Memory: In the Task Manager under the Performance tab: 1978 MB In Computer Properties: 2 GB And running wmic computersystem get TotalPhysicalMemory /format:list in the command line: 2074554368 Bites Number 1 matches Number 3 except Number 1 is rounded. When I convert Number 3 to GB 2074554368 / 1024 / 1024 / 1024 I don't quite get 2 GB. I get 1.93207932 GB. Why does Number 1 and Number 3 not match Number 2?

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  • Will my internet address for my internal site cause my traffic to go external?

    - by Toby Allen
    If I have two domains pointing to the same machine, but one resolves to an internal address and the other to my internet facing router, will there be any differnce in route taken to my machine (primarily in terms of performanc). eg. internal.mydomain.com resolves to 192.168.1.200 external.mydomain.com resolves to A.Web.External.IP both eventually resolve back to the same machine. For a client in the network, will using the external address give a performance penalty?

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  • Does a bad Internet connection increase bandwidth usage?

    - by Synetech
    My (Rogers) cable connection has been pretty bad recently (channels 3 and 10 are particularly fuzzy—it’s analog, not digital cable). Not surprisingly, this has caused my cable modem to drop out and have to reestablish a connection a couple of times since it started. The poor connection of course means higher corruption (not necessarily dropped per se) which causes the TCP/IP stack to have to retransmit packets more often. Reduction of bandwidth throughput aside, I got to wondering if it increases the actual bandwidth usage. That is, if there is a high error rate on the line causing packets to have to be retransmitted: Does this increase a bandwidth monitoring program’s numbers? Does the ISP count the retransmitted packets toward the monthly cap? Based on what I remember from my university networking courses and common sense, I have a feeling that the answer to both questions is yes, but I cannot reliably measure the first, and have no authoritative answer for the second. I’m wondering if maybe the retransmitted packets are acknowledged as being duplicates and thus not counted somewhere along the line.

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  • Linux: don't use file system cache under a directory

    - by GetFree
    For a PHP website I'm monitoring, I need to see what files are being used each time the browser makes a request. I thought of using find . -type f -amin 1. With that I get all files which were read in the last minute (it's a developing server so only I am using the website). I took care of removing the noatime attribute from the mounting point. However there must be something else that's preventing the kernel from reading the actual files on disk because the access time is not being updated when I read a file. I guess it must be the file-system cache which is retrieving the files from memory. Is there a way to disable file caching under a specific directory? (public_html in my case) Also I read somewhere that there is the nobh mounting atributes which apparently disables file caching under that mounting point, but I'm not sure.

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  • Optimize SAP SQL Server database using DTA

    - by Danilo Brambilla
    Is it safe to optimize a SQL Server 2005 SAP R/3 database using Database Tuning Advisor raccomandatations? We are experiencing very low performance on a dedicated SAP database because of intense read operations ad the db and DTA suggest to create about 25 indexes and 100 stats. I am not an expert of SAP and I am quite surprised to see that this database has about 56.000 tables and 6500 views (120 GB of data). Thank you all for help

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  • Restarting rsyslog re-sends logs again

    - by Jay Taylor
    I am running Ubuntu 12.04.1 LTS on EC2. I have a bunch of application servers which are configured to forward their logs to a central server via rsyslog. Since putting in Nagios monitoring on the log files on the central server, I've been getting alerts indicating that particular application servers are failing to forward their logs to the centralized server. Logging into the machines and restarting the rsyslog service fixes the problem. However, rsyslog then re-transmits the logs again, resulting in duplicates on the collector. Why is it doing this?

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  • MySQL takes forever after running certain php scripts... optimization help?

    - by DFischer
    When I run a couple scripts from the vBulletin software (like uninstalling a plugin) it takes forever. When monitoring the memory usage, it shows this = -/+ buffers/cache: 158 381 Swap: 255 10 245 It seems that MySQL is only using a certain amount and once it does it tries to use the swap instead? I have a 512MB slice and right now my key buffer is at 16M and max_allowed_packet is at 16M. Is there something else I should increase or can I increase those variables and still be safe? Thanks.

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  • Windows7 issue in mutli- tasking and memory

    - by Nitesh
    I seeming some problem in my windows OS recently, let me first say my system configuration. processor - Intel(R) Core(TM)2 Quad CPU Q8400 @ 2.66 GHz Installed memory (RAM) - 4.00 GB (3.00 GB usable) System type - 32 bit operating system I am using two OS in this system, first one is Windows7 and the other is centOS. Well, I am using this from a long time there was no problem , and all of a sudden since from couple weeks I am facing problems in my Windows7 OS. In windows7 i was nearing using multiple jobs almost every time i log in, there was no problem but now i don't no what happen I am not able to do multiple jobs at same time. For example- 1 I am now not able to listen to music in windows media player and view photo's. All of a sudden the system stops working and does not respond and then respond after 5mins and the music get played where it got stopped after 5 mins. 2 When i start browersing internet it hangs all of sudden and doesn't respond for 2 or 3 mins and gets loading. I mean it just happens for every operation i do in the system. Even now typing was also difficult, it gets hanged very frequently even though i am doing single task. I have never come across this kind of problem before. So the first thing i did was to see the useage of the processor and the memory. Well, i thick the useage of the processor was fine, for single task the useage was some where around 3 to 5%. Well, it was something weird i found in the memory, in spite of no task that i was running it was using somewhere around 34 to 41% of memory. So i opened the task manager and click on resource monitor in performance tab. And in the memory section of the monitoring tool i found the usage of my RAM, it was something like this. Hardware reserved - 1029 MB In Use - 1430 MB Modified - 49 MB Standby - 1566 MB free - 22 MB And i could also see Available 1588 MB Cached 1615 MB Total 3067 MB Installed 4096 MB well, this if all i could find out and i have no idea why my computer is acting so weird all of a sudden and the performance problem is growing day by day and i also don't know if there is problem in Bios, i have let it for default settings from long time. please help me and Thank you in advance for reading this and helping me.

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  • Lock Windows keyboard and mouse but still display screen normally

    - by Stephen Lacy
    I'm using windows 7, I have a dual monitor display. It displays important information related to the business, I'd rather that random users that walk in can't just walk over to it and start using the computer with the same access rights as the user the monitoring software is running as. What I would like is if any time someone presses a button on the keyboard including alt-ctrl-delete all that would appear is a dialog asking for a password. Then I can click cancel and it will return to showing the data I want displayed. ClearLock doesn't work I tried it btw

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  • Alerting when a RAID Array disk fails locally on VMWare ESX or ESXi System

    - by Tim K
    With ESX and ESXi, we recently had two systems where that the boot partition became degraded due to a failed disk. The only alert we managed to capture was the visual alert on the Dell servers. We failed to received any electronic alerts regarding the failed or degraded array. Does anyone have any experience with monitoring for these types of failures? In both cases, the servers were running in a RAID 5 SCSI configuration (5 disks on one system, 3 disks on another) which if we were running a Windows Server OS, we would have had an alert created in the Eventviewer. Where would I begin to look for this solution. Can it be configured in VCenter or vFoglight?

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