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• Is this a valid backup strategy for MongoDB?

  - by James Simpson

  I've got a single dedicated server with a MongoDB database of around 10GB. I need to do daily backups, but I can't have downtime with the database. Is it possible to use a replica set on a single disk (with 2 instances of mongod running on different ports), and simply take the secondary one offline and backup the data files to an offsite storage such as S3 (journaling is turned on)? Or would using master/slave be better than a replica set? Is this viable, and if so, what potential problems could I have? If not, how do I conceptualize this to work?

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• Common filesystem for servers behind a rackspace load balancer

  - by thanos panousis

  Our PHP application consists of a single web server that will receive files from clients and perform a CPU-intensive analysis on them. Right now, analysis of a single user upload can take 3sec to conclude and take 100% CPU. This makes our system capacity amount to 1/3 requests per second. My team's requirement is to increase capacity without a lot of code reengineering. A possible solution would be to set up a load balancer in front of multiple servers running the same app, connecting to a common DB. The problem is that the analysis outputs files on disk. A load balancer would increase capacity, but then files won't be available between servers so consequent client requests may fail. We are hosted on Rackspace, is there a way to configure some sort of "common" storage for all servers, without having to rewrite our file persistance code? Current code relies on simple fopens etc. What are our options?

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• How full is too full for mechanical hard drives?

  - by Sunny Molini

  I have heard many claim that it doesn't matter how full a drive is until it starts cutting into temp and virtual memory space. This doesn't make sense to me, given the nature of how the data is transacted on a hard drive. The inside of the platter presents less data per revolution than the outside of the drive does, by significant factors. The inside 40% of the radius of full size hard drive is used for the spindle, so only the outside 60% is used for data storage, but that still means that the inside track of a hard drive presents data 60% slower than the outside track. By my calculation, a Hard drive that is only 10% full should perform about 2.25 times faster than a hard drive that is 90% full, assuming that the flow is constrained by other factors. Am I wildly off base here? For all the drives I know, even the top speeds of the first 1% of the drive would be well within the bandwidth provided by a SATA 2 connection.

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• Issue about Exchange 07 SP2 Backup in SBS 08

  - by Bastien974

  Hi, I'm trying to backup my Exchange 07 SP2 with the Windows Server Backup. Since it's supposed to make a exchange-aware backup with the SP2, I created a scheduled full backup of the C: (where is located my First Storage Group). The backup is successful, but when I go in Mailbox database's properties, I see that the last full backup is 2 months ago (a that time backup worked but we had some issue then). In Server Manager, Features, I checked that I have Windows Server Backup Features checked. What am I missing ? Thank you !

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• cat contents of one file into another file

  - by Attila O.

  I have a large (binary) file that has some corruption near the beginning. Then, I have a second, smaller file that I obtain by starting to download the same file again, but interrupt after I have enough bytes to fix the original one. My question is, how do I simply overwrite the beginning of the large file with the contents of the second, smaller file? I could use cat, tail and head, but that would create a copy of the file. There must be a more efficient way. Oh yes, and I'm looking for a linux command-line solution, if that wasn't obvious. I'm using bash, but I have other shells if that helps.

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• Automatically change aspect ratio of WMC videos

  - by NeverwaY

  is there a way to automatically change the aspect ratio flag of a video so that it displays in 16:9 in all video players WITHOUT reencode? Quality loss is not a concern. I just need a quick and efficient way to convert several video files to 16:9 as quickly as possible. For instance, older tv show series. I use a plasma tv for my media center, and do not want black bars burnt into my screen when people that dont understand how to use the zoom function in WMC7 watch tv all day. thanks.

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• What are the Windows G: through Z: drives used for?

  - by Tom Wijsman

  In Windows you have a C: drive. The first things labeled beyond that seems to be extra stuff. So my DVD drive is D: and if you put in a USB stick it becomes F:. And then some people also have A: and B:. But then, what and where are G: through Z: drives for? Is it possible to connect so many things to a computer to make them all in use? Or more than them? Would it give a BSOD? Or would this slow down the system somehow? Or what would happen? What if I want to connect even more drives to the computer? Because with the hard drive limits it's more efficient to buy more drives than to buy a single drive with a lot of capacity. Is it possible to create drive letters like 0: through Z: or AA: through ZZ:?

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• Making an SSD drive the primary boot/system drive

  - by David Ebbo

  [Not much of a hardware guy, so please excuse my ignorance :)] I just ordered an HP Pavilion Elite HPE-450t (desktop), which came with Win7 installed on the hard drive, using two partitions (C: and D:). Separately, I bought a 128GB SSD that I intend to use as my system drive. I got it in there and connected it, and right now, it's the J: drive (which was the first letter available in disk manager). My goal is for the SSD to get a clean OS install be the C: drive, and to clean out the other hard drive and make it D: (for misc data storage) Question #1: the motherboard has two SATA plugs. Does it matter which one I use for which drive? Question #2: what's the right way to install Win7 on the SSD in a way that it ends up being the C: drive? Do I need to switch some things around in the current Win7 that came with it, are can I do all that while installing Win7 on the SSD?

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• Is there a way to tell if a file is done copying?

  - by Mike Cooper

  The scenario is this: Machine A has files I want to copy to Machine C. Machine A can't access C directly, but can access Machine B that can access Machine C. I am using scp to copy from Machine A to B, and then from B to C. Machine B has limited storage space, so as files come in, I need to copy them to C and delete them from B. The second copy is much faster, so this is no problem with bandwidth. I could do this by hand, but I am lazy. What I would like is to run a script on B or C that will copy each file to C as each one finishes. The scp job is running from A. So what I need is a way to ask (preferably from a bash script) if file X.avi is "done" copying. Each of these files is a different size, and I can't really predict size or time of completion. Edit: by the way, the file transfer times are something about 1 hour from A to B and about 10 minutes from B to C, if time scale matters at all.

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• Moving tool bars in Acrobat X Pro

  - by user67275

  I'm using Acrobat X pro for Windows. I found that two lines of tool bar takes too much space. So I would like to combine them into one line, or move them to left or right side. I do know that I can hide those tool bars by Ctrl+H. But I want to use them without hiding. Since most documents I use are letter size and portrait type, tool bars on the left or right side would be much more efficient way of using space. Does anybody know how I can do this? (I think I could do it in Acrobat 9..but I can't in X version)

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• Reliable 1tb or larger hard drive?

  - by jasondavis

  I am in the market for 2-3 new drives, I would like each to be at least 1tb to 2tb in size. I have been reading all the reviews on newegg.com for 1tb and larger drives and they all have 1 thing in common. Almost all the ones I read about have complaints of them being DOA or dieing within a few weeks of use. I am hoping to find some drives with this storage range that have a reputation for lasting a long time instead of a short life. Please help me if you have any experience with these sort of drives? Most the ones I read about were Western Digital brand. I realize some might complain that this questions answer would be based upon a timeframe, so if a user searches and find this answer a year from now it will be outdated but I would appreciate any help based on the current hard drives available as of April 10th, 2010 on newegg.com

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• Rsync like windows backup tool

  - by Halfgaar

  I need to backup some windows machines and have been unable to find the proper tool. What I need is a tool that does efficient copying of changed files to a windows network location, like Rsync does. In turn, the server will then back that up using rdiff-backup, a tool which does very clever incremental backups. Right now I'm using windows' 7 included backup feature, but I really don't get that. It's too much off-topic, but it doesn't suffice (seems buggy as well). I looked into Amanda, but as soon as it wanted to install MySQL, I aborted. I also tried Deltacopy, but unfortunately, I don't remember what the problem with that was... Any advice for an rsync like tool that just does daily syncs to a network location?

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• Looking for a router with multiple WAN ports and load balancing

  - by Cyrcle

  I'm going to be moving in a few months. The location I'm moving to is great except it's on a road with very few people, so the internet access option is limited to DSL at 1.6Mbps down, 384kbps up. This is much slower than I'm used to. One option is to get at least two of the DSL lines. There's also good possibility that I'll be able to get WiMax or similar. I've been looking around a bit and it seems like what I need is a load balancing router with multiple WAN ports. Can anyone recommend some good ones? I could also go with a small power efficient Linux box with multiple NICs. What would be good software for that? It'd need to be able to handle around 10Mbps. Thanks for any help

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• Optimal Instance Size for EC2 Sharepoint Server

  - by Rob Wilkerson

  I'm surprised that I can't find any info about this, but I'm not a Windows admin and just a novice EC2 user. I have a client who wants to stand up a Sharepoint server on EC2 for internal use. The team is small (10-20) folks and traffic will be light. Mostly, the client is looking for one place to store documents (and revisions of documents) while making access easy for authenticated users anywhere in the world. They've settled on Sharepoint and have other EC2 instances so that seems like the natural fit, but I'm trying to figure out what to recommend for them. I'm currently thinking about a Medium instance. I'm afraid to go smaller because I think Windows would need a fair amount of memory just to run, but I'm very open to suggestions. Any advice would be much appreciated. I expect that the storage itself would happen in an EBS mount, but again, suggestions welcome. Thanks for your input.

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• Statsd, Graphite and graphs

  - by w00t

  I've setup Graphite and statsd and both are running well. I'm using the example-client.py from graphite/examples to measure load values and it's OK. I started doing tests with statsd and at first it seemed ok because it generated some graphs but now it doesn't look quite well. First, this is my storage-schema.conf: pattern = .* retentions = 10:2160,60:10080,600:262974 I'm using this command to send data to statsd: echo 'ssh.invalid_users:1|c'| nc -w 1 -u localhost 8126 it executes, I click Update Graph in the Graphite web interface, it generates a line, hit again Update and the line disappears. If I execute the previous command 5 times, the graph line will reach 2 and it will actually save it. Again running the same command two times, graph line reaches 2 and disappears. I can't find what I have misconfigured. The intended use is this: tail -n 0 -f /var/log/auth.log|grep --line-buffered "Invalid user" | while read line; do echo "ssh.invalid_users:1|c" | nc -w 1 -u localhost 8126; done

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• best way to record local modifications to an application's configuration files

  - by Menelaos Perdikeas

  I often install applications in Linux which don't come in package form but rather one just downloads a tarball, unpacks it, and runs the app out of the exploded folder. To adjust the application to my environment I need to modify the default configuration files, perhaps add an odd script of my own and I would like to have a way to record all these modifications automatically so I can apply them to another environment. Clearly, the modifications can not be reproduced verbatim as things like IP addresses or username need to change from system to system; still an exhaustive record to what was changed and added would be useful. My solution is to use a pattern involving git. Basically after I explode the tarball I do a git init and an initial commit and then I can save to a file the output of git diff and a cat of all files appearing as new in the git status -s. But I am sure there are more efficient ways. ???

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• Esxi with iSCSI SAN slows down with many multiple VMs running

  - by varesa

  I have a server with ESXi 5 and iSCSI attached network storage(4x1Tb Raid-Z on freenas). Those two machines are connected to each other with Gigabit ethernet, and a procurve switch in between. After a while, if I have many(4-5 or more) vms running, they start to get un-responsive (long delays before anything happens). We are trying to find the reason behind this. Today we looked at esxtop, and found that DAVG of that iSCSI LUN stays at 70-80. I read that +30 is critical! What could be causing those high response-times?

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• Are the new Hewlett-Packard "Sandy Bridge"-based notebooks dispatched globally?

  - by leladax

  I'm currently trying to figure out why a European chain retailer is delaying a dv7 [remaining code number is not same with american]; it is listed in their site for several days and while ordered on Monday they still don't have it in their central storage. In an earlier call I was advised that since Intel announces the processor now it may start dispatching from the 6th. Is that true? Is HP obligated not to dispatch it before the 6th? (normally/legally or as a 'deal between gentlemen'). Does anyone know if HP dispatches normally dv7s now? Did they intentionally not dispatch them to retailers before the CES?

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• What postgresql client version should I build against, if server is 8.x?

  - by Ben Voigt

  I'm planning updates to a system that is currently running with 8.x server on Windows, 8.x client on Windows, and 8.x client on Linux. Obviously that seems like a bad choice of platform in a mixed environment, but the Linux machine has no persistent writable storage (as an anti-rootkit measure). I'm concerned with compatibility between versions right now. Can a linux postgresql 9.0.x client connect to a Windows 8.x server? The server is using some third-party binary extensions, so upgrading it is a more involved task and will be done later. If combining a 9.0.x client and 8.x server is discouraged, would latest 8.x clients be able to continue to connect if I did upgrade the server first? META: What tag is appropriate for backward-compatibility questions?

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• Unable to Uninstall Exchange 2010 ("Internet Newsgroups" public folder)

  - by helplessITguy

  I am trying to uninstall Exchange 2010, before installing a new instance of Exchange 2010 SP1 on a different server. (Our production Exchange server is 2003) We have met all of the Mailbox uninstall prereqs except for the following: Error: Uninstall cannot continue. Database 'Public Folder Database 1579722947': The public folder database "Public Folder Database 1579722947" contains folder replicas. Before deleting the public folder database, remove the folders or move the replicas to another public folder database. For detailed instructions about how to remove a public folder database, see http://go.microsoft.com/fwlink/?linkid=81409&clcid=0x409. Recommended Action: We have been able to delete all Public Folders in the 2010 storage group except for the one (previously replicated) folder - "Internet Newsgroups". How can I delete this folder without impacting public folders on the production Exchange 2003 server? We have: verified permissions to the public folder removed replication for the folder on (on the Exch 2010 server) tried PowerShell scripts: RemoveReplicaFromPFRecursive Get-PublicFolder -Server "\" -Recurse -ResultSize:Unlimited | Remove-PublicFolder -Server -Recurse -ErrorAction:SilentlyContinue

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• Firefox cannot recognize certificates for well knows sites

  - by RCola

  When trying to connect to well known sites, for instance hotmail.com Firefox shows that This Connection in Untrusted. In the OptionsAdvancedCertificates it's configured to select one matching certificate automatically. Why Firefox does not trust current connection? Can it be Man-in-the-middle attack or it's something like broken certificate storage on my computer? UPDATE UPDATE2 Solved: the problem is Antivirus Web Access protection. It interferes with HTTPS connection. Similar to Man-in-the-middle? Why ESET cannot do it correctly?

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• How can I get the size of an Amazon S3 bucket?

  - by Garret Heaton

  I'd like to graph the size (in bytes, and # of items) of an Amazon S3 bucket and am looking for an efficient way to get the data. The s3cmd tools provide a way to get the total file size using s3cmd du s3://bucket_name, but I'm worried about its ability to scale since it looks like it fetches data about every file and calculates its own sum. Since Amazon charges users in GB-Months it seems odd that they don't expose this value directly. Although Amazon's REST API returns the number of items in a bucket, [s3cmd] doesn't seem to expose it. I could do s3cmd ls -r s3://bucket_name | wc -l but that seems like a hack. The Ruby AWS::S3 library looked promising, but only provides the # of bucket items, not the total bucket size. Is anyone aware of any other command line tools or libraries (prefer Perl, PHP, Python, or Ruby) which provide ways of getting this data?

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• Shuttle FB51 mobo does not boot with external USB drive attached [closed]

  - by user127236

  I am repurposing an old Alienware desktop as a home media server. The PC is based on the Shuttle FB51 motherboard. The BIOS is a Phoenix Version 6.00 PG, release date 12/16/2002. I have loaded Ubuntu 12.04 LTS on the internal hard drive. I am using a Western Digital WD Elements 1.5 TB USB 2.0 Desktop External Hard Drive for media storage. When the external drive is plugged in and the PC is powered on, it freezes very early in the BIOS self-test, even before it begins the memory test. If I unplug the drive, the self-test proceeds without further problems. I can plug the USB drive back in when the self-test is complete, and Ubuntu will boot and find the external drive normally. I've tried several changes to the BIOS setup without finding a cure for the boot issue. Any assistance gratefully accepted. JGB

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• Why does Hyper-V and Windows Backup crash (BSOD) after successfull backup?

  - by Payson Welch

  Hello I am running Server 2008 R2 with a handful of Hyper-V guest nodes. If Windows backup runs without any of the Hyper-V nodes running, the server is fine. If Hyper-V runs a backup while the Hyper-V nodes are running, it is fine until a few minutes after the backup completes, and then it BSODs. The storage location for the backup is iSCSI - I am wondering if anyone has any input on what might be causing this? I don't have the Hyper-V nodes setup on a vlan and there is only one NIC on the server. Is it possible this is a networking / driver issue, and if so how would I reconfigure the networking to fix this?

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• nginx hashing on GET parameter

  - by Sparsh Gupta

  I have two Varnish servers and I plan to add more varnish servers. I am using a nginx load balancer to divide traffic to these varnish servers. To utilize maximum RAM of each varnish server, I need that same request reaches same varnish server. Same request can be identified by one GET parameter in the request URL say 'a' In a normal code, I would do something like- (if I need to divide all traffic between 2 Varnish servers) if($arg_a % 2 == 0) { proxy_pass varnish1; } if($arg_a % 2 == 1) { proxy_pass varnish2; } This is basically doing a even / odd check on GET parameter a and then deciding which upstream pool to send the request. My question are- What is the nginx equivalent of such a code. I dont know if nginx accepts modulas Is there a better/ efficient hashing function built in with nginx (0.8.54) which I can possibly use. In future I want to add more upstream pools so I need not to change %2 to %3 %4 and so on Any other alternate way to solve this problem

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