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  • MX records and CNAMEs

    - by sly
    I realize similar questions were asked/answered on this, but I have a subtle detail to which I can not find answers anywhere. Let's exemplify with the following DNS entries: foo.example.com A 1.1.1.1 bar.example.com A 1.1.1.2 wee.example.com CNAME foo.example.com foo.example.com MX foo.example.com.s9a1.psmtp.com bar.example.com MX bar.example.com.s9a1.psmtp.com Note the last line. My institution has that kind of MX records, where for each MX record the value has the label prepended. Question 1 is, what is the motivation for this (why not just s9a1.psmtp.com)? Question 2 is more subtle and follows.. My understanding is that an MX record should not contain any aliases for neither label nor the value, i.e. the following would be bad practice: wee.example.com MX wee.example.com.s9a1.psmtp.com Then, how should the RRs look for the alias wee.example.com? Thanks!

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  • Alternative to Windows Home Server (WHS) backups

    - by Adam Tegen
    Since Microsoft announced the end of life for WHS, are there any alternatives? Specifically, I am interested in recovering from a catastrophic disk failure with WHS. For example, this is my ideal scenario when a desktop hard-drive fails (has a bad virus, etc): Install a disk of the same size or greater Boot the desktop with the Recovery Disc Point the recovery application at the WHS Pick the machine, the drive(s) and the date of the backup Have a couple beers Reboot to a working machine as if nothing happened. I would need to slap multiple disks in the machine without raid. It sounds like LVM will work here. It would be nice, but not required to have de-duplication of files when multiple machines are backed up. (Single Instance Storage)

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  • Why is Latex so big?

    - by putmatrix
    On windows, MikTex comes in a DVD. It's several times bigger than a typical Linux distribution. This makes it impossible to carry Latex on a memory stick like I do with many other useful software. Why is it so big? I thought it was just a language or system, but I've never seen any programming language with gigabytes of libraries. It's just that there's a bad feeling when your Latex distribution takes up four gigabytes of space when you expect it to be more of, say, 200mb.

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  • Mac Disk-Utility input/output error

    - by Michelle
    a couple of other people have posted about this but my specific problem has not been addressed. For months I have been backing up DVDs and home movies with no problem then all of a sudden I get an "input/output" error. Yes I have cleaned the disks. Actually I have tried 8 different ones - they are not all bad so its obviously my computer. I have done a scan and cleaned up the HD a bit just in case but nothing is helping. I don't want to download other programs since this one works but seems to be having a problem. Any ideas?

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  • RAID10 without write-back cache = horrible write performance?

    - by Harry Mexican
    I have just provisioned a dedicated server on singlehop. I'm running it through some tests to know what to expect performance-wise. On the I/O side (with 4 1TB disks in RAID 10) I get: write-cache disabled 200 MB/s read throughput 30 MB/s write throughput I thought that was really low compared to my desktop HD which gets 150-150 or so. So I had a chat with them and they suggested enabling the write cache. New results: write-cache enabled 280 MB/s read 260 MB/s write which is great and all but means I'd have to add a BBU for an additional monthly cost. Is it normal for the write throughput to be 1/4 of a regular drive on RAID10, if you don't have write cache? It almost feels like its intentionally bad to force you to pony up for the BBU. I'd be happy with normal non-raid performance of 150/150.

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  • Horrible performing RAID

    - by Philip
    I have a small GlusterFS Cluster with two storage servers providing a replicated volume. Each server has 2 SAS disks for the OS and logs and 22 SATA disks for the actual data striped together as a RAID10 using MegaRAID SAS 9280-4i4e with this configuration: http://pastebin.com/2xj4401J Connected to this cluster are a few other servers with the native client running nginx to serve files stored on it in the order of 3-10MB. Right now a storage server has a outgoing bandwith of 300Mbit/s and the busy rate of the raid array is at 30-40%. There are also strange side-effects: Sometimes the io-latency skyrockets and there is no access possible on the raid for 10 seconds. The file system used is xfs and it has been tuned to match the raid stripe size. Does anyone have an idea what could be the reason for such a bad performing array? 22 Disks in a RAID10 should deliver way more throughput.

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  • IIS 7 + ASP.NET 4

    - by user26712
    Hello, I have an ASP.NET application that I am trying to convert to an ASP.NET 4 application. The application is fairly simple. I have created a new web application in IIS 7.5 pointing to the directory that the ASP.NET application exists in. When I attempt to execute the application, but entering http://localhost%3A%5Bport%5D into my browser, I receive the following error: Error Summary HTTP Error 500.21 - Internal Server Error Handler "PageHandlerFactory-Integrated" has a bad module "ManagedPipelineHandler" in its module list Most likely causes: * Managed handler is used; however, ASP.NET is not installed or is not installed completely. * There is a typographical error in the configuration for the handler module list.

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  • How do you test if a PCI slot is working - motherboard diagnostic software?

    - by Adam
    I suspect that my motherboard is bad, and that my PCI-E slot is not working. I have a Gigabyte motherboard that had a Hauppage 2250 working fine in the PCI-E slot for many months. However - recently - would not get TV channels that I used to get --- until finally Media center cant detect any channels at all. Got a new tuner card (ATI 350 card) - cant detect any channels. The cable signal is good - I have it connected directly to a TV - all channels come in clear. SO that is why I suspect a motherboard problem. Are there any motherboard diagnostic scanner utilities that can verify I need a new motherboard

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  • How to install Oracle's exp / imp binaries

    - by Sotapanna
    I was browsing the net to find a solution, but I had no luck. :( How can I install Oracle's imp / exp binaries to my CentOS box without installing an Oracle Server? I'm accessing an existing Oracle database on another machine, so I only need a client here. I already installed sqlplus and its dependencies (oracle-instantclient11.2-basic-11.2.0.3.0-1.x86_64.rpm, and oracle-instantclient11.2-odbc-11.2.0.3.0-1.x86_64.rpm), but that didn't provide those tools. Do I really need to fully install Oracle? My aim is to suck a database dump from the Oracle to my CentOS box. If there is another way to do this without using exp I wouldn't feel bad about NOT using it, but it seems to me there is no alternative.

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  • How to format HDD with MHDD Tool.

    - by PP
    I have copied MHDD application on a bootable CD and i wan to use it to low level format my HDD which had some bad sectors on it. so how can mark these badsecotrs using MHDD application? Pluse can i partition/format my HDD using MHDD because after low level format i want to setup window xp on that drive. can some one explain me step by step procedure to how to lovel format driven and partition/format it and then setup xp on that. Link to MHDD app. http://hddguru.com/content/en/software/2005.10.02-MHDD/ Thanks, PP.

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  • Prevent Server Restart after Windows Updates

    - by eidylon
    we have a number of servers in our office, as a small hosting company, and these servers are critical to business, ... web server, mail server, db server, etc. On a semi-regular basis, when the machines get automatic updates, they just automagically reboot themselves in the middle of the night. A number of them have software which must be running on the console session (bad practice, I know, but out of my control). When they reboot themselves, these programs obviously shut down, leaving customers upset and services interrupted. How do you set a Windows Server 2003 R2 machine to NEVER automagically reboot itself after updates? And perhaps, if possible, to instead email someone so that they are aware it needs a pending reboot and can schedule it for the best time? Thanks in advance!

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  • What could cause Vista machines to degrade in performance?

    - by gencha
    We have installed several machines running Windows Vista at a client site. These machines run the same set of applications each day and are not operated with by any user. They mainly run a 3D application for digital signage purposes. After a few months I noticed that several machines suffer from really bad stuttering. The performance is unacceptable. At first I figured it was faulty hardware. But after putting a fresh image on them, they run perfectly fine again. These are Core i7 machines with GTX 280 graphics adapters. They should be able to handle the workload without any trouble (and they do, at least for a while). I really have no idea how to track down the source of this issue. Especially since not all of the machines display the same issue.

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  • Does sending e-mail in the name of customers increase the risk of being marked as spammer?

    - by Adrian Grigore
    Hi, We are developing a SaaS website application that lets users send invoices to their clients. Ideally, these e-mails should appear to be originating from our customers, so the sender e-mail address domain will not match the reverse IP entry for our server. In effect we would be forging their e-mail address, but of course with their consent. Will that result in a higher probability of being marked as a spammer / their e-mails being marked as spam? If yes, how bad is the penalty? And what about people who have an e-mail address originating form an SPF-enabled domain? I guess it should be the majority of the big e-mail providers.

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  • Migrated from Exchange 2003 to Exchange 2007 - remove old 03 computer account?

    - by TheCleaner
    Migrated from Exchange 2003 to 2007 back in February of this year. I've still got the old exchange computer account in AD. Can I simply delete the computer account or will bad things start happening? I've looked in the Exchange 07 console and don't see the old server listed at all. HOWEVER: we do still have an old CNAME for this old Exchange server pointing to the new one for a few old clients that still have their mail server set to the old name...if that matters at all. I ran "get-exchangeserver" on the new server and the old one isn't listed at all.

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  • Memcached failover

    - by user25164
    We have 2 memcached servers configured and use the Eniym client. When one of the server is down, it appears this server is added to the deadServers list (ServerPool.cs) and tries to resurrect the server every 10seconds (we have configured deadTimeOut to be 10seconds). Attempting to connect to the failed server causes a TCP timeout, the pages take a long time to load which results in bad user experience. 1) What is the standard way of resolving this issue? There are some posts about removing the server from the deadServers list. Is it okay to do this? 2) What is the recommended deadTimeOut setting (I understand by default it's 2 mins and we've changed it to 10seconds in our implementation) 3) Am I correct in my understanding that the cached data is not replicated across Server 1 and Server 2? If Server 1 is down, then it goes to the database to fetch these values (and it doesn't really check Server2)? Any help is really appreciated.

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  • Problems installing Ruby 1.9.2 and rvm on Debian Lenny

    - by Dave Everitt
    I have currently have Ruby 1.9.1 (bad) and want to install 1.9.3 under rvm. However, rvm requirements gives a long list: install build-essential openssl libreadline6 libreadline6-dev curl git-core zlib1g zlib1g-dev libssl-dev libyaml-dev libsqlite3-dev sqlite3 libxml2-dev libxslt-dev autoconf libc6-dev ncurses-dev automake libtool bison subversion But I've hit a problem here: /# apt-get install libreadline6 Reading package lists... Done Building dependency tree Reading state information... Done E: Couldn't find package libreadline6 ...and (I imagine after just hunting down a Debian source to download curl) finding these packages isn't going to be a picnic. Given that there are few packages to install before I can get rvm to install Ruby 1.9.3, what's a good way forward? My sources.list: deb http://archive.debian.org/debian/ lenny main contrib

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  • Blacklisting: IP's or domains?

    - by johnnietheblack
    I am implementing a blacklisting system on my website that monitors contact forms for suspicious usage (both spam content and excessive frequency). When I find somebody / robot that meets my criteria for blacklisting, I want to send them to my DB as a blacklisted entity. My question is, should I blacklist them as an IP or as a domain? As far as I can see, blacklisting an IP is going to be far more effective, because I allow people to enter their email address in the form, and they can easily just change their domain on a regular basis. However, the downside is that if I blacklist an IP, I could potentially be blacklisting a large group of people who share an IP, when only one person is bad (ie - college campuses, coffee shops, etc). Is there a solution I'm missing?

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  • Would a Socket Connection Outperform an Intarvaled Database Sweep and Requests?

    - by Jascha
    I'm building a small chat application to add to an existing framework. There will only be 20-50 users MAX at any one time. I was wondering if I could get away with updating a cache file containing (semi) live chat data for whichever users happen to be chatting just by performing timed queries and regular AJAX refreshes for new data as opposed to learning how to open and maintain a socket connection. I'm sure there are existing chat plug-ins out there. But I just had a hell of a time installing one and I could see building the whole damn thing taking just as much time as plugging one in. Am I off to a bad start? Thanks in advance -J (p.s. this is a semi closed network behind a php login so security isn't a great concern)

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  • Windows Setup could not configure Windows to run on this computer's hardware

    - by Hello71
    The whole installation goes smoothly up to the point of "Completing installation ...". The monitor changes resolution, after which a standard dialog box pops up saying Windows Setup could not configure Windows to run on this computer's hardware Then, in a few seconds, the whole machine powers down. Trying to restart produces the message: STOP: c000021a {Fatal System Error} 0x00000000 (0xc0000001 0x00100448) OR it boots into Setup and comes up with the message: Windows Setup encountered an unexpected error... (This is not the actual error, just paraphrasing) I tried using the OEM restore instead of a regular install, but it fails with the same error. (Even though it worked before...) General specs: HP Pavilion Elite e9262f Intel Core i5-750 Processor ATI Radeon HD 4650 Hitachi HDT721010SLA360 ATA Device 6GB DDR3 RAM SuperMulti DVD Burner with LightScribe Some built-in Wi-Fi module http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01916917 I've tried disconnecting the wireless card and disabling the built-in Ethernet and Firewire via the BIOS, and replacing the wireless keyboard and mouse with wired USB ones. Didn't work. I've also tried changing the SATA controller settings in the BIOS to RAID, AHCI, and IDE, reinstalling each time I changed. Still not working. I think the reason why it is showing the Fatal System Error is because it didn't finish installing before it errored out and shut down, so the system is left in an inconsistent state. I've tried 3 different copies (including the OEM restore) of Windows 7 now, and they're all failing at the same point, with the same error message. I've tried to install Windows 7 maybe 10 times already, with the exact same error message at the exact same location. Hm... Interestingly, the 32-bit version of Windows 7 works, but the 64-bit version doesn't. Perhaps it was a badly burned disk? Reburning the 64-bit version still comes up with the same error. Here's a picture of the side of the case that clearly says it came with Windows 7 64-bit, along with the model number and CPU. sudo fdisk -l: Disk /dev/sda: 1000.2 GB, 1000204886016 bytes 255 heads, 63 sectors/track, 121601 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x0009896f Device Boot Start End Blocks Id System /dev/sda1 * 1 13 104391 7 HPFS/NTFS /dev/sda2 14 94119 755906445 7 HPFS/NTFS /dev/sda3 119922 121602 13492224 7 HPFS/NTFS /dev/sda4 94120 119922 207257740+ 5 Extended /dev/sda5 119527 119922 3170769 82 Linux swap / Solaris /dev/sda6 107174 119526 99225441 83 Linux /dev/sda7 94120 107173 104856192 7 HPFS/NTFS Partition table entries are not in disk order

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  • Cloning hard drive -- data, operating system settings, everything

    - by Salman A
    I am using Windows XP. My hard drive (Seagate 160gig Barracuda) is about to fail. Its already developed bad sectors and it seems to get worse everyday. Data transfer mode is down to PIO mode 2, chkdsk runs every now and then, registry and important windows files get corrupted and I spend 30-60 minutes running chkdsk /f /r from the recovery console. I've got a replacement (Seagate 5000gig Barracuda) and now i want to transfer each and every thing on to the new drive. I don't want to go through windows and software installation, I spent ages getting all those software installed and configured on that hard drive. Need advice: whats the best way to transfer everything onto the new drive so that it behaves just like the old one. And are there any "gotchas".

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  • How to move unseen windows => Cannot access my application after switching monitors

    - by Stephane Rolland
    I switch monitors really often: At work I have a very poor computer, and gpu too, which is bad at keeping its configuration, resolution and monitor position between each reboot. Both monitor are different size and resolution. When doing that I often have applications that were on one of the monitors that remember their last position opened... so now they are unseen, at screen coordinates I cannot access. I know there is a shortcut that can access the move functionnality of a window. Could you remind it to me. Do you have other trick to center all opened windows into the visible screens ?

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  • Does anyone use the L-Track trackball?

    - by thethinman
    I've been using the Logitech Trackman Marble Mouse for years. Now I'm looking for a trackball with a scroll wheel, larger and heavier ball, and preferably rollers instead of pins. It must be finger (not thumb) operated. The Kensington Expert Mouse is close, but from what I've read the scroll wheel is poorly implemented. They also switched from rollers to pins. I bought a Kensington Orbit Trackball and it's not bad but the scroll wheel is rough and the ball is the same as the marble mouse. I'm still looking for something better. I found the L-Trac and it looks good but there's little info on the web. Has anyone used it and can provide their impressions? Or can you point out another option?

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  • Volume group disappeared, LVs still available

    - by Ben
    I've run into an issue with my KVM host which runs VMs on a LVM volume. As of last night the logical volumes are no longer seen as such (I can't create snapshots of them even though I have been for months now). Running any scans all result in nothing being found: [root@apollo ~]# pvscan No matching physical volumes found [root@apollo ~]# vgscan Reading all physical volumes. This may take a while... No volume groups found root@apollo ~]# lvscan No volume groups found If I try restoring the VG conf backup from /etc/lvm/backups/vg0 I get the following error: [root@apollo ~]# vgcfgrestore -f /etc/lvm/backup/vg0 vg0 Couldn't find device with uuid 20zG25-H8MU-UQPf-u0hD-NftW-ngsC-mG63dt. Cannot restore Volume Group vg0 with 1 PVs marked as missing. Restore failed. /etc/lvm/backups/vg0 has the following for the physical volume: physical_volumes { pv0 { id = "20zG25-H8MU-UQPf-u0hD-NftW-ngsC-mG63dt" device = "/dev/sda5" # Hint only status = ["ALLOCATABLE"] flags = [] dev_size = 4292870143 # 1.99902 Terabytes pe_start = 384 pe_count = 524031 # 1.99902 Terabytes } } fdisk -l /dev/sda shows the following: [root@apollo ~]# fdisk -l /dev/sda Disk /dev/sda: 6000.1 GB, 6000069312512 bytes 64 heads, 32 sectors/track, 5722112 cylinders Units = cylinders of 2048 * 512 = 1048576 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x000188b7 Device Boot Start End Blocks Id System /dev/sda1 2 32768 33553408 82 Linux swap / Solaris /dev/sda2 32769 33280 524288 83 Linux /dev/sda3 33281 1081856 1073741824 83 Linux /dev/sda4 1081857 3177984 2146435072 85 Linux extended /dev/sda5 1081857 3177984 2146435071+ 8e Linux LVM The server is running a 4 disk HW RAID10 which seems perfectly healthy according to megacli and smartd. The only odd message in /var/log/messages is the following which shows up every couple of hours: Jun 10 09:41:57 apollo udevd[527]: failed to create queue file: No space left on device Output of df -h [root@apollo ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/sda3 1016G 119G 847G 13% / /dev/sda2 508M 67M 416M 14% /boot Does anyone have any ideas what to do next? The VMs are all running fine at the moment apart from not being able to snapshot them. Updated with extra info It's not a lack of inodes: [root@apollo ~]# df -i Filesystem Inodes IUsed IFree IUse% Mounted on /dev/sda3 67108864 48066 67060798 1% / /dev/sda2 32768 47 32721 1% /boot pvs, vgs & lvs either output nothing or "No volume groups found".

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  • Windows XP installation problems

    - by Samurai Waffle
    I recently asked a question on here, and thought I had it working... Here is a link to it. Windows XP Installation problems So basically I'm having trouble getting XP installed. To sum it up, a computer I have had a boot sector virus, and I used Darik's Nuke and Boot to wipe the hard drive clean. So the hard drive has nothing on it. I had to try and install Windows through a DOS prompt, because for some reason it won't read it off the DVD. The UBCD is able to look at the files located on the DVD I have in, but I can't boot from it for some reason. So I extracted it to a USB drive, booted to DOS and started the setup process. Here's the weird thing with DOS... It can only find the C: drive. The C: drive in DOS is the flash drive that I have in, running DOS. I can't find the hard drive anywhere! So anyways, after starting the setup process, it copied the files over to the "hard drive" (which took 16 hours because the version of DOS I ran couldn't run smartdrv.exe), and it said the computer had to reboot. So I let it reboot, and it stopped and said there is no boot device. So I popped in UBCD that I have installed on a flash drive, and I discovered that it had copied the Windows files over to the flash drive and not the hard drive. It never asked where it should extract the files... So I toyed around with UBCD, ran a memory test on the hard drive to make sure it was fine, and it came out clean. So I'm stuck now. How can I get this installed? Writing this, I came up with an idea. If I copy the DOS startup files over to the hard drive, would I be able to start DOS from it? If so, I believe that could fix my problems. Any help is greatly appreciated, because I am running out of ideas and am at my wits end with this computer.

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  • Database modularity with EBS volumes

    - by Eclyps19
    I would like to add modularity to my websites on EC2 instances by encapsulating the site files and the mysql files in their own EBS volumes. The end result that I'm going for is the ability to quickly mount a volume or two to different servers running the same AMI (for testing/development/emergency maintenance, etc), as well as maintain separate snapshots of each. I'm able to do this fairly easily with a single database by symlinking my mounted database EBS to the appropriate places (/var/lib/mysql, /etc/my.cnf, /var/log/mysqld.log), but I'm not sure if it would even be possible be possible to have multiple databases on different EBS volumes running concurrently. Example: /website1/www.website.com /database1/ /website2/www.otherwebsite.com /database2/ Could anybody shed some light on this for me? Is it possible? Is it a bad idea? Thanks.

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