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• how did my laptop lose daylight savings time on power loss?

  - by EndangeringSpecies

  it was an old laptop that may or may not have dead CMOS battery (at least it had time reset to 0 when I dusted it off). So, it was plugged into power for awhile without the main battery and the clock was correct. Then there was a power outage. When I subsequently turned it on, surprise-surprise, it had one hour off correct time. So the clock apparently kept running during the outage, but daylight savings time info vanished (from disk? where is it stored?) How come?

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• Motherboard: Intel S5520HCR s1366 SSI EEB

  - by Crazy_Bash

  I'm building a storage server for online video streaming. I thought about adding two SSD drive for a OS. other 15*(12 SATA & 3 SSD) drives i want to build with aufs XFS and ethernet 4GB/sec network. But I'm confused a little. S5520HCR board supports 6, SATA/300, RAID: 0, 1, 10, Intel ICH10R. Does it mean i can use SATAIII HDD? I'm planing on buying SEAGATE SV35 Series (3.5, 3??, 64??, SATA III-600). also my Chassis supports up-to 16 sata and the motherboard only 6 what kind of sata controller should i use? What's better in terms of performance 1366 or 2011 socket? My server so far: AIC RSC-3EG-80R-SA1S-2 3U Motherboard: Intel S5520HCR s1366 SSI EEB Kingston DDR3 8192Mb PC3-10600 1333MHz (KVR1333D3N9/8G) Seagate 3000GB 64MB 3.5" 7200rpm SATAIII (ST3000DM001) Kingston 480GB SSD 2.5" SATAIII Intel E1G44HTBLK Intel Xeon E5606 2133MHz/L3-8192Kb/QPI s1366 tray SERVER ACC CARD SAS PCIE 16P HBA 9201-16I LSI00244 SGL LSI

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• XDMCP is slow any ideas? (looking for alternative remote desktops)

  - by peteri

  I've been used to using RDP on Windows to remote to machines, and I've got an asus eee 701 which I want to use to do some *nix programming on. While the eee is a lovely little machine the screen and keyboard are a little small to use for lots of programming. I've tried using Xming (the free version) to remote login into the eee from my desktop using XDMCP (or even using a ssh session as a straight X11 server and no desktop on the eee) the whole thing seems seriously slow over wifi the initial desktop takes at least 5 seconds to paint (might even be 10 seconds I haven't actually timed it). So my real question is what do other folks use for remote control with a GUI for their *nix boxes? I am finding it hard to believe the performance is so bad over a wifi network (It makes the Mac IIs I used to use a college in 1988 seem fast) or is this just a problem with Xming and using say the Cygwin X11 server would be better.

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• How do I get rid of "Trusted Drive Manager"?

  - by Earlz

  I have a Dell laptop that's been experiencing some weirdness lately. Apparently Dell puts "Trusted Drive Manager" on their hardware.. Well, now I keep getting these errors: I tried uninstalling Dell Data Protection, but it says some other package is required for the installation, which I can't install because I'll get another generic error (Dell Data Protection Access Drivers). This error pops up when I first boot, when I open a save file dialog, when I try to do a disk cleanup. How the hell do I get rid of this!?

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• Openvz: What exactly does it mean when tcpsndbuf failcnt increases? Why must there be a minimum difference between limit and barrier?

  - by Antonis Christofides

  When the failcnt of tcpsndbuf increases, what does this mean? Does it mean the system had to go past the barrier, or past the limit? Or, maybe, that the system failed to provide enough buffers, either because it needed to go past the limit, or because it needed to go past the barrier but couldn't because other VMs were using too many resources? I understand the difference between barrier and limit only for disk space, where you can specify a grace period for which the system can exceed the barrier but not the limit. But in resources like tcpsndbuf, which have no such thing as a grace period, what is the meaning of barrier vs. limit? Why does the difference between barrier and limit in tcpsndbuf be at least 2.5KB times tcpnumsock? I could understand it if, e.g., tcpsndbuf should be at least 2.5KB times tcpnumsock (either the barrier or the limit), but why should I care about the difference between the barrier and the limit?

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• Which modules can be disabled in apache2.4 on windows

  - by j0h

  I have an Apache 2.4 webserver running on Windows. I am looking into system hardening and the config file httpd.conf. There are numerous load modules and I am wondering which modules I can safely disable for performance and / or security improvements. Some examples of things I would think I can disable are: LoadModule cgi_module others like LoadModule rewrite_module LoadModule version_module LoadModule proxy_module LoadModule setenvif_module I am not so sure they can be disabled. I am running php5 as a scripting engine, with no databases, and that is it. My loaded modules are: core mod_win32 mpm_winnt http_core mod_so mod_access_compat mod_actions mod_alias mod_allowmethods mod_asis mod_auth_basic mod_authn_core mod_authn_file mod_authz_core mod_authz_groupfile mod_authz_host mod_authz_user mod_autoindex mod_dav_lock mod_dir mod_env mod_headers mod_include mod_info mod_isapi mod_log_config mod_cache_disk mod_mime mod_negotiation mod_proxy mod_proxy_ajp mod_rewrite mod_setenvif mod_socache_shmcb mod_ssl mod_status mod_version mod_php5

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• How to get the spec of a machine on Linux?

  - by machinePurchaser

  I am interested in getting the spec of a machine, because I am thinking getting a similar server. What I am mostly interested in knowing is the number of cores / CPUs / etc., the amount of memory, the speed of the CPUs, the CPU cache size, and any other detail which is important for performance. My question is two-fold: Which parameters should I be interested in other than the ones I specified above? Is there an easy way to read them off the machine in Linux? cat /proc/cpuinfo reveals a lot about the CPUs, for example... What about memory (would rather not rely on top), etc?

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• Generating and collaborating on network map diagrams?

  - by Ian C.

  I have to turn out some network topology maps for very large networks. I'd like the format for the maps to be something other people can also edit and contribute to regardless of what software I'm using on my Mac to build them. I don't mind spending money on my end for software, but I can't require that my clients spend any money. I also can't promise my clients are also using OS X -- they could be running Linux or Windows. Is there a best software application on OS X for producing maps that I can share with other, non-OS X, users? Is there a best format for sharing topology maps that I should use when exporting the maps to disk?

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• SSD runs faster on Windows as compared to Linux [closed]

  - by wushugene

  Windows 7 seems to install, boot and run much smoother & faster than each the three linux distros I have recently tried (Ubuntu 12.04 unity, Linux mint 13 MATE, and Fedora 17 on gnome 3.4). Why am I facing bad performance in Linux? I have tweaked my Linux installs for the SSD (enabling trim, disabling swap, etc.) I'm using an Acer TravelMate with i5-2410m processor, intel hd 3000 graphics, 8 gigs of ram, and a 256 gb samsung 830 ssd. Edit: Boot times are 10-15 seconds slower, there is noticeable delay from login to fully loaded desktop, and in general does not appear to be as responsive as my old windows 7 install or the Linux guests I had running on it.

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• Image archiving on network folders.

  - by Steve

  Our company uses Symantec Enterprise Vault to archive network folders and files, presumably to save on disk space. I can't see any other benefits. Our company is an architectural firm, and the problem our users face is locating particular images in network folders. Because all the files are archived, Windows Explorer is unable to generate image thumbnails. Each image needs to be individually restored from archive by double-click before it can be viewed. This is a big time-waster for our architects. Symantec say there is no workaround for this. Does anyone know of an alternative we could use for archiving images? Alternatively, some batch utility to create and maintain a thumbs.db file in each folder? Thanks.

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• Is the sql backend right choice for LDAP?

  - by skomak

  Hi, I have felt some troubles with LDAP dif database after unexpected system reboots. This databse was only read so it is confused why database have had errors. So im searching for replacement of this database. I think SQL would be more reliable. What do you think, is it? I need to know how much performance loss i'll meet then. How many more IOPS(I/O per second) in percentage I loss too. Thanks in advance, skomak

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• Truecrypt system partion partially encryted but then drive corrupted and won't boot - decrypting so I can access files to backup?

  - by Dr.Seuss

  So I was attempting to encrypt my (Windows 7) system drive with Truecrypt and it stopped at around 15% and said that there was a segment error and that it could not proceed until it was fixed. So, I restarted the computer and ran HDD Regenerator which subsequently fixed the bad sectors on the drive, but now my system cannot boot. So, I run a number of recovery disks to no avail (Windows repair is unable to fix) and the drive won't mount on a linux version run from a CD because the drive is encrypted. So I tried mounting the drive using Truecrypt under the Linux distribution on the disk and selected "Mount partition using system encryption without pre-boot authentication" so I can decrypt, but I get an error message about it only being possible once the entire system is encrypted. How do I get out of this mess? I need to be able to back up the data that's on that partially encrypted drive so I can reinstall my operating system.

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• What is the right iptables rule to allow apt-get to download programs?

  - by anthony01

  When I type something like sudo apt-get install firefox, everything work until it asks me: After this operation, 77 MB of additional disk space will be used. Do you want to continue [Y/n]? Y Then error messages are displayed: Failed to fetch: <URL> My iptables rules are as follows: -P INPUT DROP -P OUTPUT DROP -P FORWARD DROP -A INPUT -i lo -j ACCEPT -A OUTPUT -o lo -j ACCEPT -A INPUT -p tcp --dport 80 -m state --state NEW,ESTABLISHED -j ACCEPT -A OUTPUT -p tcp --sport 80 -m state --state ESTABLISHED -j ACCEPT What should I add to allow apt-get to download updates? Thanks

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• need help in backing up 2 partitions to flash drive(Acronis)

  - by Nrew

  I'm trying it on virtual box and installed Acronis 2010. The backup was successful but when I checked on the backup which is on my flash drive. Here's my problem: Ive installed firefox before the backup, but the program files folder in the flash drive has no folder called firefox. How do I restore the the 2 partitions using the backup. What I did was to: Go to tools & utilities in Acronis then chose clone disk. Selected the source and destination(flash drive). Then I restart, the backup began. First with the first partition which has xp installed and the 2nd was vista lite. What do I do to restore it: I only got these folders on the root of the flash drive: Documents and settings Program files Windows BOOTSECT.BAK

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• raid 5 creation (using mdadm) lots of read/writes on creation: is this normal?

  - by Gbrits

  I created a software raid 5 disk using: mdadm -C /dev/md2 -l5 -n4 /dev/sd[i-l] at the same time I'm using dstat to see io-activity: dstat -c -d -D total,sda1,md2,sdi,sdj,sdk,sdl -l -m -n and notice that disks sd[i-k] are all read from and sdl is written to. Now, I do understand that raid5 has to be configured, but it takes a really long time and all disks are clean & formatted (using xfs) so I figure there might be some kind of shortcut to skip (unnecessary? ) checking.. Is it? The creation is part of a time-critical nightly batch-process (run on amazon ec2) so it's not a one-time thing. Thanks, Geert-Jan

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• Running OpenVZ virtual servers within a Xen XCP vritual server? Bad practice?

  - by Damainman

  I have a 1 server with 8GB RAM and 2xQuadcore Processors. It currently has the Xen XCP installed on it, and centos6.2 x64 running on a virtual machine. I have a server control panel software that I want to use and it allows the administration via a web interface for Openvz machines. My questions are: Would this be considered bad practice? Would there be a big performance hit? Should I avoid this all together or am I going about it all wrong? Thank you in advance.

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• How (much) is virtualization used today?

  - by BLAKE

  I know that where I have worked, I have pushed alot for virtualizing our servers. I think that it is much easier to implement and maintain than physical servers. I have been using Microsoft's Virtual Server 2005 R2 since it was released. Right now at my workplace we have 12 VMHosts that hold about 55 VMs. We have 6 other servers that we have been unable to convert to VMs. I want to know how other people in our field view virtualization. I know that I have had developers dislike the notion of VMs claiming major performance hits. What do other Sys Admins think about virtualized servers?

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• Reinstall Windows on mass computers

  - by user791022

  At work there are about 40 DELL PC's - half of them are Windows Vista and other half are Windows 7. Some of the DELL PC's are 220s and 230s model. If I want to re-install Windows then I can use a Recovery/Recovery disk on any Dell PC's (220s or 230s). It take too long to complete the setup, for example - after re installing the Windows then I need to install the drivers, update windows, install IE9, create default users account and so on. It take about 3 hour to complete setup! I am looking for a solution Where I can create an Image of windows (with driver and completed setup) and then I use same Image it on any PC's at work? If one of the PC need reinstalling - I would like to reinstall via network (LAN) by grabbing the Image? Is there something that before booting into windows - computer check something via network which can download the Image?

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• suggest AMD machine for software developement [closed]

  - by superb1

  I need a AMD machine (Processor, Motherboard, Ram, HDD ) for software developement .. I will mainly use microsoft visual studio 2010. Operating system would be windows 7 . Suggest decent machine but i dont want to overspend....i guess the rating system of ecommerce websites may help you to suggest !? I want you to suggest from this list : http://www.flipkart.com/computers/components/processor-20246?ref=bae2643a-2cc8-4710-942f-79e7fbc1b416 plz note basic criteria for vs 2010 is 1.6GHz or faster processor 1 GB (32 Bit) Ram 5400 RPM hard disk DirectX 9 capable video card running at 1024 x 768 or higher-resolution

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• Where are the Windows 7 System Restore Points stored and how to preserve them?

  - by Rohit

  I am using Windows 7 Professional. My system crashed few days back and to recover that, I inserted the Windows 7 DVD. While running the System Restore from the DVD, it showed there are no restore points. It shocked me. I created few restore points, where they disappeared. Is there a way to preserve these restore points from accidental deletion? Is there any other FREE tool to take snapshot of the image on other disk?

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• Linux using the link command

  - by Xavier

  Here it goes. I have a folder that contains a not so large amount of space called /data/backup but I have been told that if I link that folder (/data/backup) to an even bigger folder area like /bigdata/backup for example, that I will be able to execute backups to the /data/backup folder because it will be just a link but the data will be seen in both folders and the latter one (/bigdata/backup) will contain the backup results but it will show on both folders and since the /bigdata/backup has far more disk space then the backup will no longer fail because of space problems in the /data/backup one. Is this true? Thanks Xav

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• How is it possible for SSD's drives to have such a good latency?

  - by tigrou

  First time i read some information about SSD's, i was surprised to learn they internally use NAND flash chips. This kind of memory is generally slow (low bandwidth) and have high latency while SSD's are just the opposite. But here is how it works : SSD drives increase their bandwidth by using several NAND flash chips in parallel. In other words, they do some data striping (aka RAID0) across several chips (done by the controller). What i don't understand is how SSD's drives have such a low latency, whereas they are using NAND chips? (or at least lot better than what a typical single NAND chip would do) EDIT: I think under-estimate NAND chip capabilities. USB drives, while powered by NAND's are mostly limited by USB protocol (which have a pretty high latency) and the USB controller. That explain their poor performance in some cases.

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• Can't burn 8.1G iso onto 8.4GB DVD - "Media does not have enough free space"

  - by Max Williams

  I'm trying to burn a dvd on a mac with an external (firewire-connected) dvd drive. I'm checking the size of the iso thus: DVD-4:dvd_files macbook$ ls -l /tmp/hybrid.iso -rw-r--r-- 1 macbook wheel 8700884992 Aug 22 10:57 /tmp/hybrid.iso DVD-4:dvd_files macbook$ ls -lh /tmp/hybrid.iso -rw-r--r-- 1 macbook wheel 8.1G Aug 22 10:57 /tmp/hybrid.iso The "human-readable" size is 8.1 Gig but when i try to burn, onto an 8.4G dual-layer dvd, it says "Media does not have enough free space" The definition of a "Gigabyte" according to Wikipedia is 1 billion bytes, so the iso size should actually be 8.7 Gig according to this definition, in which case the disk definitely isn't big enough, and it's just that the -h option to ls is misleading. Is the discrepancy just due to the ls command using a different definition of "G" (eg 1024 Meg aka 1.07 Gig? This comes out as 8.103 which fits what ls is displaying)

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• Snow Leopard Hangs at Login Window

  - by jessecurry

  I've had an issue for the past few months, but I rarely restart so it hasn't caused too much trouble. Basically, when I start up my Mac (iMac10,1 - 3.06GHz Intel Core 2 Duo, OS X 10.6.3) everything proceeds as usual until I reach the login window. The login window displays normally, but keyboard and mouse input seem to be ignored. This condition persists for around 5 minutes at which time everything goes back to normal. While the login window is frozen my second monitor appears entirely blue, the second monitor receives a background as soon as the login window becomes responsive. If I startup while holding SHIFT the problem still occurs, but the freeze is much shorter. Looking through my logs I see no activity during the time that the login window is frozen. I've attempted to repair disk permissions, and gone through every possible maintenance option in Cocktail.

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• Cached css/javascript files on Sun Java System Web Server

  - by Derp

  I'm doing front-end web development in a Solaris 10 / Sun Java System Web Server 7.0U2 environment. I have noticed that changes to static css or javascript files often do not take effect immediately, whereas changes to static html files always do. My best guess is that a default setting in the web server causes it to cache certain file types in order to provide reasonable performance out of the box. I don't have the admin server running--I'll need to edit the config files by hand. What change(s) can I make so that all of my css and javascript edits take effect immediately? Thanks!

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