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  • Online Storage and security concerns

    - by Megge
    I plan to set up a small fileserver. I already own a small server at HostEurope (VirtualServer L, 250GB space), but they don't offer enough space (there is the HostEurope Cloud, but paying for bandwidth isn't an option here, video-streaming should be possible) Requirements summarized: Storage: 2TB, Users: ~15, Filesizes: < 100GB, should be easily reachable (Mount as a networkdrive or at least have solid "communication" software) My first question would be: Where can I get halfway affordable online storages? And how should I connect them to my server? Getting an additional server is a bit overkill, as I know no hoster which allows 2 TB on a small 2 Ghz Dual Core 2 GB RAM thingy (that would be enough by far, I just need much space), and connecting it via NFS or FTP over Internet seems a bit strange and cripples performance. Do you have any advice where I could get that storage service from? (I sent HostEurope a custom request today, but they didn't answer till now. If they can provide me with that space, this question will be irrelevant, but the 2nd one is the more important one anway, don't do much more than recommend me some based on experience, you don't have to crawl hours through hosting services) livedrive for example offers 5 TB for 17€ / month, I'd be happy with 2 TB for 20 €, the caveat is: It doesn't allow multiple users, which leads me to my second question: Where are the security problems? Which protocol is sufficient (I want private and "public" folders etc. the usual "every user has its own and a public space"-thing), secure and fast? (I'd tend to (S)FTP, problem with FTP is: Most of those hosting services don't even allow FTP with mutliple users and single users lead me into "hacking" a solution (you could map the basic folder structure on the main server and just mount every subfolder from the storage, things get difficult with a public folder with 644 permissions though) Is useing something like PKI or 802.1X overkill for private uses?

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  • monitoring a /21 for potential bad guys with snort and port mirroring

    - by Adeodatus
    Hi all, I want/need to start monitoring our network a bit better. Its an odd network in that it comprises 2 /22 public IPs and a slew of private admin IPs. I do have one point in the network where it all comes together and I can turn on port mirroring on the catalyst. From that port, I'd like to turn up a box running various utilities. Snort is high on my list but it'd be nice to also get some networking statistics with something like Netflow. So, what are peoeple's thoughts. I can turn up a box needed for this with a bit of ease. We have the hardware available. What should I run? I'd love to know what kind of nasty things are potentially going on but I'd also like to see statistics on what people are doing on the network so I can better tweak our systems to handle it better and improve performance. I'm open so please, give me some ideas to go along with what I've got.

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  • Limit Apache 2 Memory Usage

    - by UltraNurd
    I am running a hobby webserver off of an ancient Blue & White G3/300 running Debian PPC Squeeze 2.6.30. The performance is okay for a while after a restart, but it eventually gets more and more bogged down. Right now it's at 76 days uptime, and the main culprit seems to be the memory usage of 10+ apache2 processes. I think I need to lower the values for StartServers, MinSpareServers, and/or MaxSpareServers, but I'm not sure which one to adjust, and there are three sections for each depending on which mpm module is in use. How do I tell which of the following sections I need to change, and what are some reasonable values given that the box has 448 MB physical memory (weird upgrade history of one each 64, 128, and 256 sticks)? <IfModule mpm_prefork_module> StartServers 5 MinSpareServers 5 MaxSpareServers 10 MaxClients 150 MaxRequestsPerChild 0 </IfModule> <IfModule mpm_worker_module> StartServers 2 MinSpareThreads 25 MaxSpareThreads 75 ThreadLimit 64 ThreadsPerChild 25 MaxClients 150 MaxRequestsPerChild 0 </IfModule> <IfModule mpm_event_module> StartServers 2 MaxClients 150 MinSpareThreads 25 MaxSpareThreads 75 ThreadLimit 64 ThreadsPerChild 25 MaxRequestsPerChild 0 </IfModule> There aren't any other instances of StartServers in my apache2.conf, but none of those mpm modules appear in mods-available or mods-enabled. Ideas? Thanks!

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  • SMB access from XP to Windows 2008 R2

    - by Pablo
    Here's the thing... I have a very slow file copy performance from Windows XP clients to Windows 2008R2 servers. Here are the facts: Windows XP to Windows 2K3: Fast Windows XP to Windows 2K8: Very Slow Windows 7 to Windows (any): Fast Despite the fact that the obvious solution would be to upgrade to Windows 7, well, we have 900 desktops so it's not an option in the short time. I have tried everything: Disabling SMB2.0, disabling security signatures, changing the TCP Window size, disabling the W2K8 auto tuning, upgraded the drivers, etc. We eliminated the network; both the server and the client are connected to the same core switch (no hops, no routers, same VLAN). Upon monitoring the network with a packet capture utility, we see that the SMB packets being exchanged between the W2K8 and the XP machines are very small packets (256 bytes); despite the fact that the MTUs are properly set (1500) and there is no fragmentation whatsoever. In fact, those SMB packets show, on the IP datagram, that the window is 65535 or close. The same trace, made using the same application but instead of using a W2K8 share uses a Windows XP share (and that goes FAST) shows SMB packets of 4096 bytes. I can post the traces if necessary. So, why does XP-W2K8 negotiation arrange for 24-bytes SMB payload, whereas the XP-XP negotiation arranges for 4096 SMB packets? Any ideas? I am running short of those...

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  • ESXi 4.0 Guests Locking up

    - by Brendan Sherwin
    I installed ESXi 4.0 on an HP Proliant g5 with a 64bit Xeon processor and took advantage of the free license as I work for a public school. I created two instances of server 2003 from scratch, one to be the DC, DHCP, the other to be a file server and DNS/DHCP backup. I had both guests up and running fine, setup my user accounts, transferred the data, etc etc. Once I joined a client machine to the domain, I would find that both of my Windows guests would lock up. Sometimes it would be for five or so minutes, once it was overnight. The "locked up" state means that as far I could tell, all services were stopped; dhcp no longer handed out IP's, DNS stopped working, I couldn't RDP into the server. The ESXi host, my HP server, was still running fine. VSphere was working, and I could look at the performance of the individual guests.I would try Powering off the hosts from inside VSPhere, and the hosts would start powering off, but get stuck at 95%, and stay that way, sometimes only for 10 minutes, others for hours. Several times I had to restart ESXi from it's console in order to restart my machines. Now, can anyone tell me what is happening, and how I can fix it, or take steps to prevent it? I hired a consultant to come take a look at it, someone who's experience and knowledge I trust, and he told me he had never seen anything like this ever before. He spoke to a friend of his who is VM certified, and he also said he had never heard of this issue. Thanks for your replies, and I'll do my best to respond ASAP. Currently, the server is powered off, and I've reinstituted my nine year old Server 2000 boxes, and I'm considering installing ESXi 3.5. Does anyone know a host created in 4.0 will work in 3.5? I'd really like to avoid having to rebuild those accounts! I know 4.0 works on this server, as I have another server in another school with the same exact hardware running 4.0 fine. Brendan

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  • ZFS - Impact of L2ARC cache device failure (Nexenta)

    - by ewwhite
    I have an HP ProLiant DL380 G7 server running as a NexentaStor storage unit. The server has 36GB RAM, 2 LSI 9211-8i SAS controllers (no SAS expanders), 2 SAS system drives, 12 SAS data drives, a hot-spare disk, an Intel X25-M L2ARC cache and a DDRdrive PCI ZIL accelerator. This system serves NFS to multiple VMWare hosts. I also have about 90-100GB of deduplicated data on the array. I've had two incidents where performance tanked suddenly, leaving the VM guests and Nexenta SSH/Web consoles inaccessible and requiring a full reboot of the array to restore functionality. In both cases, it was the Intel X-25M L2ARC SSD that failed or was "offlined". NexentaStor failed to alert me on the cache failure, however the general ZFS FMA alert was visible on the (unresponsive) console screen. The zpool status output showed: pool: vol1 state: ONLINE scan: scrub repaired 0 in 0h57m with 0 errors on Sat May 21 05:57:27 2011 config: NAME STATE READ WRITE CKSUM vol1 ONLINE 0 0 0 mirror-0 ONLINE 0 0 0 c8t5000C50031B94409d0 ONLINE 0 0 0 c9t5000C50031BBFE25d0 ONLINE 0 0 0 mirror-1 ONLINE 0 0 0 c10t5000C50031D158FDd0 ONLINE 0 0 0 c11t5000C5002C823045d0 ONLINE 0 0 0 mirror-2 ONLINE 0 0 0 c12t5000C50031D91AD1d0 ONLINE 0 0 0 c2t5000C50031D911B9d0 ONLINE 0 0 0 mirror-3 ONLINE 0 0 0 c13t5000C50031BC293Dd0 ONLINE 0 0 0 c14t5000C50031BD208Dd0 ONLINE 0 0 0 mirror-4 ONLINE 0 0 0 c15t5000C50031BBF6F5d0 ONLINE 0 0 0 c16t5000C50031D8CFADd0 ONLINE 0 0 0 mirror-5 ONLINE 0 0 0 c17t5000C50031BC0E01d0 ONLINE 0 0 0 c18t5000C5002C7CCE41d0 ONLINE 0 0 0 logs c19t0d0 ONLINE 0 0 0 cache c6t5001517959467B45d0 FAULTED 2 542 0 too many errors spares c7t5000C50031CB43D9d0 AVAIL errors: No known data errors This did not trigger any alerts from within Nexenta. I was under the impression that an L2ARC failure would not impact the system. But in this case, it surely was the culprit. I've never seen any recommendations to RAID L2ARC. Removing the bad SSD entirely from the server got me back running, but I'm concerned about the impact of the device failure (and maybe the lack of notification from NexentaStor as well). Edit - What's the current best-choice SSD for L2ARC cache applications these days?

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  • Prestashop is not saving Memcached settings

    - by ianenri
    I have a issue with the admin site of prestashop. I'm trying to activate the caching system but it doesn't save the setting. When I add a server (I'm using an Amazon ElasticCache server) saves it, but when I select the enable option and click Save, it redirects me to "Back Office Preferences Performance" but with a blank page and the admin tabs visible. I go back to those settings again and i see that the caching option is disabled. Also, there is a warning: "To use Memcached, you must install the Memcache PECL extension on your server. http://www.php.net/manual/en/memcache.installation.php" , even if i already installed memcached via yum. I tried also, by modifying the settings.inc.php file editing define('_PS_CACHE_ENABLED_', '0'); to: define('_PS_CACHE_ENABLED_', '1'); But i get 500 Internal Server Error in every page, so i prefer to leave it as before. Any ideas? I'm using PrestaShop 1.4.6.2 with Nginx 1.0.11 and PHP-FPM 5.3.8 in a CentOS 5.7 system.

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  • Raid-1 Western Digital Green AARS, cloning and WD Align Utility

    - by Jaguar
    Hello all, My current setup runs on top of 2x Western Digital 2500KS drives on Raid-1, using the motherboard's 780G raid controller, on WinXP. Everything is fine, but the drives are a bit noisy. I am considering buying 2x WD6400AARS disks which are the 640GB slower 'green' drives, but also feature the Advanced Formatting 4KB sectors. This means that for WinXP the partition will have to be aligned to work properly, else there is a performance penalty. There are 2 questions here: The Green drives from WD are all slower and are (according to WD) susceptible to drop-out's from the controller. Has anyone any experience in this matter? Is there a possibility the controller will drop a drive? If so, can i do anything about it? Secondly, western digital gives a utility to perform the alignment on the partition. The thing is, will the utility see the drives in question as the operating system only sees 1 logical disk? I will be making the transition using a cloning tool (most probably norton ghost) unless i don't find a solution or a clear answer, in which case i'll just buy a win 7 license and make a clean install... thx in advance

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  • Windows Server 2008 RAID10

    - by JT
    Hello All, I am building a storage system for myself. I have a 16 bay SATA chasis and right now I have 1 x 500GB SATA for booting 8 x 1.5TB for data. 3Ware 9500S-8 RAID card where these 8 drives above are connected to. I am used to linux, but not in the RAID department. I have Windows experience too. What I am looking for is something that I can just let sit, be reliable and use for other items as well. (Like running test websites, Apache, MySQL, etc). This box is private on a Class-C subnet. My thought is to at least consider Windows Server 2008. I especially like the potential for NON-GUI Mode. Can Windows Server 2008 do a Software RAID 10 out of the box? Software RAID is better performance and better in case the raid needs to be moved to another machine? I just want to SCP files, so OpenSSH running on it? Can one install the GUI, but not use it unless they get in a bind? Is Windows a good idea or should I stick to a Linux Software RAID or FreeBSD + ZFS?

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  • Getting Server 2008 R2 to ignore all traffic from Internet-facing NIC, leaving it to a VM

    - by Wolvenmoon
    I got in to Server 2008 R2 via Dreamspark and would like to start learning on it. I don't have much option but to put it on a system sitting between the Internet and my home LAN due to electricity bills and the fact that 3 computers in an 11x11 space in 102 degree weather is pretty stygian. Currently I use a ClearOS gateway to manage everything, what I'd like to do is take my server 2008 R2 box, which has two NICs, and drop it at the head of my network. I'd want Server 2008 R2 to ignore all traffic on the external facing NIC and pass it to a virtual ClearOS gateway, and to put all its Internet traffic through its other NIC - which will face the rest of my network and be the default gateway for it. The theory is to keep the potentially vulnerable Server 2008 R2 install as tucked behind a Linux box as possible, without sacrificing too much performance. This is a home network that occasionally hosts dedicated game servers and voice chat servers, so most malicious activity is in the form of drive by non-targeted attacks, however, I don't trust Windows Server because I don't know the OS well enough, yet. So, three questions: How do I do this, am I going to be reasonably more secure doing this than if I just let the Server 2008 R2 rig handle all the network traffic and DHCP (not an option), and should I virtualize the Server 2008 R2 rig instead and if so in what? (Core 2 Duo e6600 w/ 5 gigs usable RAM)

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  • Distribute IP packets accross different NIC queues with MSI (Message Signalled Interrupts)

    - by Ansis Atteka
    NetXtreme II BCM5709 Gigabit Ethernet NIC supports MSI feature (Message Signaled Interrupts) and it has 8 queues. Each queue has its own Interrupt handler in /proc/interrupts. What I am trying to accomplish is to tell NIC which packets should go to which queue. Questions: Is it possible to manually specify which IP packets should go to which queue by encapsulated protocol type (e.g. IPsec packets go in one queue, while TCP packets go in another queue)? If it is possible - how can I do it under Linux? If it is not possible - should I look at MSI-X capable NIC cards to solve this problem? More details: We have one Interface that is terminating IPSec and forwarding/terminating TCP connections. The IPSec packet decryption is inlined (this means that decryption is done under the same ksoftirqd/X context). We are trying to find out if we will be able to improve total performance if IPSec packets will be scheduled on another CPU than TCP packets. One more limitation is that IPSec code is not MP-safe, hence I can not run it under more than one ksoftirqd/X. By default it seems that packets are distributed/hashed by source IP over the 8 NIC queues. The bottleneck is IPSec that chokes out TCP traffic while it is decrypting/encrypting IPSec packets at ~100% CPU. OS is Ubuntu 10.10 (2.6.32-27-server) and NIC is Broadcom BCM5709.

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  • Making Apache 2.2 on SuSE Linux Case In-Sensitive. Which is a better approach?

    - by pingu
    Problem: http://<server>/home/APPLE.html http://<server>/hoME/APPLE.html http://<server>/HOME/aPPLE.html http://<server>/hoME/aPPLE.html All the above should pick this http://<server>/home/apple.html I implemented 2 solutions and both are working fine. Not sure which one is better(performance). Please Suggest..Also Directive - CheckCaseOnly on never worked Option 1: a)Enable:mod_speling In /etc/sysconfig/apache2 - APACHE_MODULES="rewrite speling apparmor......" b) Add directive - CheckSpelling on (Either in .htaccess or add in httpd.conf) In httpd.conf <Directory srv/www/htdcos/home> Order allow,deny CheckSpelling on Allow from all </Directory> or In .htaccess inside /srv/www/htdcos/home(your content folder) CheckSpelling on Option 2: a) Enable: mod_rewrite b) Write the rule vhost(you can not write RewriteMap in directory. check apache docs ) <VirtualHost _default_:80> <IfModule mod_rewrite.c> Options +FollowSymLinks RewriteEngine on RewriteMap lc int:tolower RewriteCond %{REQUEST_URI} [A-Z] RewriteRule (.*) ${lc:$1} [R=301,L] </IfModule> </VirtualHost> <VirtualHost _default_:80> <IfModule mod_rewrite.c> Options +FollowSymLinks RewriteEngine on RewriteMap lc int:tolower RewriteCond %{REQUEST_URI} [A-Z] RewriteRule (.*) ${lc:$1} [R=301,L] </IfModule> </VirtualHost> This changes the entire request uri into lowercase. I want this to happen for specific folder, but RewriteMap doesn't work in .htaccess. I am novice in regex and Rewrite. I need a RewriteCond which checks only /css//. can any body help

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  • Windows Remote Desktop (RDP/MSTSC) fails with Error Code: 5

    - by BryCoBat
    I have 2 Windows XP boxen: A (running XP SP3) and B (running XP SP2). I'm using Remote Desktop to connect from A to B. When I connect, I get the login screen (which is slow to respond to keyboard/mouse input), and after logging in, I get the following: Fatal Error (Error Code: 5) Your Remote Desktop session is about to end. This computer might be low on virtual memory. Close your other programs, and then try connecting to the remote computer again. If the problem continues, contact your network administrator or technical support. I've seen one way to (sometimes) get in by opening a second RDP session to the same box [1], and if I wait long enough sometimes it will go ahead and log in anyway. Is there something broken/missing on the PC I'm trying to remote in to? Edited in reply to djangofan: There's nobody listed under "Lock pages in memory". When the double login trick works, a glance at Task Manager shows plenty of free memory, 800MB available out of 1.5 GB. (Performance tab, Physical memory) For what it's worth, this happens consistently after a reboot. What sort of exact info would be useful? There's very little remaining installed on that machine that's not Windows + Office... [1] found at http://www.fdcservers.net/vbulletin/archive/index.php/t-1580.html

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  • ReadyBoost in Windows 7

    - by Robert Koritnik
    I've bought an SD card today for my phot frame, but when I inserted it into my notebook I saw I could use it for ReadyBoost. Some background I'm a .net developer, using VMs and developing web applications (and Sharepoint). I use an HP notebook machine with Core 2 Duo 2GHz + 4GB RAM + 320 7200 HD. I simultaneously run Visual Studio 2010 with some plugins SQL Server Firefox with at least 10 tabs Chrome with about 5 tabs IIS VM with Server 2008 machine Sharepoint and occasionally also Photoshop and some InDesign as well. So I don't let my machine have a break. :D Question If I buy myself some really fast SDHC card (like SanDisk 16GB Extreme 30MB/s - is there anything faster) and use it with my Windows 7 ReadyBoost, will I see any performance gain? Is it going to work something similar to Seagate's HybridDrive Momentus with 4GB of solid state drive? What could I actually expect if I do put this card into my machine? And what would be recommended size? Observations I guess redirecting page file to it would speed up the system. Some VM machines on it would probably run faster as well because they could run parallel to HD host system I guess. Am I right or wrong?

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  • INFORMIX - listener thread err 25582

    - by Samuel Lao
    I´ve been digging different forums in the last 7 days looking for a possible solution.... Our database is based on informix running in a Linux server (LINUX SUSE 11). Suddenly, last saturday informix began to show an error message: listener-thread err=-25582 oserr=0, network connection is broken End users started to call reporting about slow network performance to this server, moments where the database application lost connection with server...so we proceeded doing a ping to the db server, getting good responses (1ms) without losing packets. I tried typing telnet (ipserver) 1526 which is informix's port for the application, it works. We had to disconnect the server and enable a backup db server which is located on another branch. It has been working in a regular way because the backup server hasn´t good specs (it is an old dell server model). So, I scanned the main server looking for viruses using Trend Micro Server Protect, it didn´t find anything (0 viruses and spywares). I revised the switches and routers, but I haven´t find anything strange... What else could be ? Thanks in advanced for your time and help with this issue.....I would really appreciate any advice...

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  • Ubuntu 10.04 Server on Hyper-V Server R2 has sluggish install and command line

    - by Paul Hobart
    I've installed Ubuntu Server 10.04 (64 bit) on a Hyper-V Server R2. I've encountered two issues that I think are related: Very slow install Very slow command prompt The text-mode installer goes through a series of text-based prompt windows. It takes 7-10 seconds for each of these windows to draw on the screen. The end result is that every time I answer a prompt and hit enter I wait for 15 seconds while the screen redraws line by line. I can literally see each line of text being drawn (like the old 300 baud modems days). Once done installing, scrolling on the command line is super slow. For instance, if a simple command, like "ls", causes the screen to scroll, it will scroll very slowly. This happens on a fresh install. The server functions as a LAMP server and an OpenSSH server, but that's it (I don't even have any Virtual Hosts set up yet). AND this only happens on the Virtual Machine console. I access the console through Hyper-V Manager and don't have this problem on any of my other Virtual Machines. Also, this problem does NOT happen when accessing a shell through OpenSSH. How can I improve this performance issue?

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  • SQL Server on Linux

    - by TimothyAWiseman
    For a particular project that is coming up, I am trying to expand my knowledge of Linux, so I am going to set up a Linux system at home. Rather than dual booting, I am thinking about putting SQL Server on a Windows Virtual Machine with Linux as the host at least until this project is over when I will probably switch back to Linux. So, I have a couple of different, but interrelated questions: How well does this work? This is only a test machine at home, so I can easily accept a fair bit of degradation, but if it is going to be a horrible reduction in performance I will dual boot instead. Is there a particular virtual machine manager I should look at to go this route? Since this is my personal machine, price is an issue but I am quite happy to pay a reasonable amount. And finally, given the choice of VMM, is there a particular Linux Distro I should be looking at? [This has been cross posted at Ask.SqlServerCentral.com . I think it may be appropriate at both sites. ]

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  • hdparm - how to secure erase SATA SSD over USB

    - by cc0
    I have been following this guide on how to secure erase an SSD (trying to improve the performance of mine, which currently only writes at about 30mb/s seq). However, I'm using an USB--Sata docking device to avoid having the harddrive frozen. Apparently using this solution the SATA device is recognized as a SCSI drive, which is giving me trouble. I use the "hdparm -I /dev/sda" command with those parameters, and I get the error; HDIO_DRIVE_CMD (identify) failed: Invalid Exchange After a lot of googling on the issue I can't seem to find anyone who has actually solved this problem. However, I have not tried to just go ahead and use the secure erase. So I'm not sure if this would actually still work. I would love any and all input I can get on this, especially on whether it will still work to do a secure erase with the drive being recognized as a SCSI drive. The drive itself is a Samsung 256gb SSD (pm800), I'm sure you can understand my reluctance to go through this procedure without feeling reasonably safe that I won't mess it up beyond repair.

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  • How can I bridge a VM to a remote network?

    - by asciiphil
    I have a system running QEMU/KVM (via libvirt). One of its VMs needs to have a presence on a subnet that is not local to the VM host. I have a Linux system on the remote subnet. Is there a way to set up some sort of tunneled bridge to cause the VM to appear present on the remote system? This will be a temporary situation (hopefully just until the VM owner can configure their system) and network performance and long-term maintainability aren't really issues. To give some more concrete information: My VM host has IP address 192.168.54.155/24. The VM has IP address 192.168.65.71/24. I have a remote system at 192.168.65.254/24. Both the VM host and remote system are running Scientific Linux 6.5. I do not control the network or routing in between the VM host and remote system. I do not have access to the guest OS on the VM. I would like traffic to the VM's IP address to end up at the VM even though its host isn't directly connected to the appropriate network. I've tried using iproute2's tunnelling, but Linux won't let me add a tunnel to a bridge. I've considered using some sort of iptables mangling to route traffic over the tunnel and make the VM think it's on the right network, but I'm not sure whether there are better approaches. What's the best way to accomplish this hack?

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  • How much network latency is "typical" for east - west coast USA?

    - by Jeff Atwood
    At the moment we're trying to decide whether to move our datacenter from the west coast to the east coast. However, I am seeing some disturbing latency numbers from my west coast location to the east coast. Here's a sample result, retrieving a small .png logo file in Google Chrome and using the dev tools to see how long the request takes: West coast to east coast: 215 ms latency, 46 ms transfer time, 261 ms total West coast to west coast: 114 ms latency, 41 ms transfer time, 155 ms total It makes sense that Corvallis, OR is geographically closer to my location in Berkeley, CA so I expect the connection to be a bit faster.. but I'm seeing an increase in latency of +100ms when I perform the same test to the NYC server. That seems .. excessive to me. Particularly since the time spent transferring the actual data only increased 10%, yet the latency increased 100%! That feels... wrong... to me. I found a few links here that were helpful (through Google no less!) ... Does routing distance affect performance significantly? How does geography affect network latency? Latency in Internet connections from Europe to USA ... but nothing authoritative. So, is this normal? It doesn't feel normal. What is the "typical" latency I should expect when moving network packets from the east coast <--> west coast of the USA?

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  • mysql mass insert data

    - by user12145
    Edit: I realized that if I construct a large query in memory, the speed has increased almost 10 times of magnitude "insert ignore into xxx(col1, col2) values('a',1), values('b',1), values('c',1)..." Edit: since I have an index on the first column, the insert time creeps up as I insert more. Can I delay the index until the end? Original: I'm using the following to batch insert 10 million rows into mysql db(not all at once, since they don't all fit into memory), it's too slow(taking many hours). should I use load file to improve performance? I would have to create a second file to store all the 10 million rows, then load that into db. are there better ways? PreparedStatement st=con.prepareStatement("insert ignore into xxx (col1, col2) "+ " values (?, 1)"); Iterator d=data.iterator(); while(d.hasNext()){ st.clearParameters(); st.setString(1, (d.next()).toLowerCase()); st.addBatch(); } int[]updateCounts=st.executeBatch();

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  • Can't connect to local MySQL server through socket

    - by Martin
    I was trying to tune the performance of a running mysql-server by running this command: mysqld_safe --key_buffer_size=64M --table_cache=256 --sort_buffer_size=4M --read_buffer_size=1M & After this i'm unable to connect mysql from the server where mysql is running. I get this error: ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (111) However, luckily i can still connect to mysql remotely. So all my webservers still have access to mysql and are running without any problems. Because of this though i don't want to try to restart the mysql server since that will probably mess everything up. Now i know that mysqld_safe is starting the mysql-server, and since the mysql server was already running i guess it's some kind of problem with two mysql servers running and listening to the same port. Is there some way to solve this problem without restarting the initial mysql server? UPDATE: This is what ps xa | grep "mysql" says: 11672 ? S 0:00 /bin/sh /usr/bin/mysqld_safe 11780 ? Sl 175:04 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --user=mysql --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/run/mysqld/mysqld.sock --port=3306 11781 ? S 0:00 logger -t mysqld -p daemon.error 12432 pts/0 R+ 0:00 grep mysql

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  • Using bind (named) as a public proxy server

    - by TrentDavis
    We have a Python DNS server that does a bunch of stuff to figure out values it should return for various DNS records. This works nicely, however as it is Python, the performance under high load won't be great. What I would like to do is have a "proxy" bind server sit in front of it to return results to the public internet. This will cache the results (typically 15 minutes, some records are a few seconds), so the load on the Python server will be greatly reduced as it will only see one look up per domain (only about 100 domains) every 15 minutes. The data in these domains changes a lot, so using a master won't work as it will constantly be changing. I have something setup that looked like it would work great (using a forwarder for the zone), and tested it with dig etc, all going great. However when we went to go live with it, things weren't working, and we figured out that named is not setting the "Authoritative" bit (fair enough, it is a forwarder). So my question is, can we tell bind to set the Authoritative bit for forwarded domains? I have looked at all the doco I can find, and can't find anything about doing things this way. Most of the doco about using it as a proxy if for a LAN to the internet. Ideally I would like to use bind as it is there and installed (CentOS 5 servers). But at a pinch we could look at a different name server to do the work if it just can't be done with bind. Thanks.

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  • OS X mouse pointer speed varies with different mouse

    - by Stan
    OS X Snow Leopard It seems that when using different mice on OS X may have different pointer speed and scrolling speed. For example, when using my Logitech basic laser mouse, the pointer speed is like normal. But when using MX Performance or Anywhere, it's very slow, I will have to adjust the pointer speed in mouse configuration to max. Even with max, it's still a bit slow. Basically, just feel the plug and play on OS X is terrible. I need re-adapt to it every single time. This is not the case on Windows OS. Also, the mouse scrolling speed varies with different mouse too. But usually they are all very slow, usually scroll 1 line at a time. If I adjust it in mouse configuration, it turns to scroll too much lines. I have Logitech official mouse driver (LCC) installed. But either tuning in LCC or mouse configuration doesn't make things better. Has anyone have similar issue? How to resolve it? Please advise, thanks.

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  • Intel Rapid Storage Technology (pre-OS) driver installation

    - by Nero theZero
    My desktop machine is built on Gigabyte GA-Z87-UD3H and Gigabyte provides the latest driver for Intel Rapid Storage Technology (IRST), which I installed after installing the OS. Same goes for my Lenovo Thinkpad-T420. And for both machine, checking the controller device under the IDE ATA/ATAPI Controllers section in Device Manager I see the driver has been updated to the latest version. I set the SATA controller to AHCI from BIOS On the desktop machine I have one WD 2TB BLACK & one WD 3TB Green I don’t use RAID, & no chance of using in near future, but according to Intel IRST improves performance in single disk scenario too. Now I have the following questions – What is the actual purpose of IRST (pre-OS install) driver that doesn’t get served with a post-OS driver that I installed? There must be some difference, otherwise there wouldn’t be a pre-OS version of the driver. Right? In the pre-OS procedure (loading the drivers at OS-installation time) after successfully completing the OS installation, do I need that post-OS driver? Because after installing from that one I got a quick launch icon that runs the IRST configuration application. Where do get that after installing the pre-OS driver? As it is “pre-OS”, when I load it at OS-installation time, does it updates anything at BIOS level or anywhere other than HDD? That’s because I’m going to dual boot Windows 7 with Windows 8.1, and after installing Windows 7 when I install Windows 8.1 & load the IRST driver for that, is there any chance of any “overwriting” or OS-incompatibility? In short, is there anything specific to follow while installing the second OS?

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