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• What's the best ramdisk for Windows?

  - by Dan Fabulich

  Just Googling for "windows ramdisk" returns a lot of stuff; some free, some paid. Can someone recommend a good one? (I'm willing to pay, but only if it's really worth paying for.) Here's what I'm looking for: Works on XP and Vista Supports 64 bit and 32 bit I'd like it to support more than 2GB of space (is that even possible on a 32 bit operating system?) I think I want something that can avoid swapping the ramdisk pages. (Though swapping would give me more free space; maybe I'll want to swap the ramdisk pages eventually? Is this configurable?)

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• MaxClients in apache. How to know the size of my proccess?

  - by Larry

  From http://httpd.apache.org/docs/2.2/misc/perf-tuning.html The single biggest hardware issue affecting webserver performance is RAM. A webserver should never ever have to swap, as swapping increases the latency of each request beyond a point that users consider "fast enough". This causes users to hit stop and reload, further increasing the load. You can, and should, control the MaxClients setting so that your server does not spawn so many children it starts swapping. This procedure for doing this is simple: determine the size of your average Apache process, by looking at your process list via a tool such as top, and divide this into your total available memory, leaving some room for other processes. The main issue is that I can't understand how to know the size, because, well i have the size of httpd on no more of 3888 But, if we need to determine the number for MaxClients, and I have 4GB of RAM, so I get: 972, so I should use like 900 in the MaxClients?

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• How to tell if PAE is hurting me?

  - by James

  I have a couple of servers with 20-30 GB RAM that are running (a variant of) RHEL4. They are currently running the SMP i386 kernel, not x64, not even the hugemem kernel. This means LowMem is confined to < 1G, and thus dentry_cache and ext3_inode_cache to 100M or so each. How can I tell if this is a problem? Here's a typical vmstat report while it's compiling some Java: $ vmstat 10 procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 1 1 0 19493816 394740 922420 0 0 1058 2292 1491 1020 6 3 80 12 2 1 0 19519480 395244 850156 0 0 1179 1412 1329 1195 9 4 75 12 1 1 0 19557368 392616 828344 0 0 1783 1680 1498 1756 14 5 72 9 I don't like the way bi is nonzero when there is so much memory free. I imagine slabtop could point more directly to the problem but I don't really understand how to interpret its output.

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• Task Manager Does Not Start Every Time

  - by diek

  I have had a problem that started some time ago, 6 months maybe. I should have noted the first instance but I didn't. I am using Windows 7 Pro, 32bit. Under normal circumstances I can open up the the Task Manager, via the task bar or cntrl alt del. When I get a program stuck, causing a freeze or non-responsive system I try to open the task manager. It will not work. I have had plenty of similar problems in the past and I had no trouble getting it open. I have searched the internet but the only results I can find are when the task manager will not start under any situation. I am running ESET NOD32 as the anti-virus. The latest example happened when I opened a new tab in Google and tried to copy an image. Google accounts for at least 50% of the examples. Ran System File Checker tool, sfc /scannow as recommended on another post. No errors returned. Any guidance would be appreciated.

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• Graphics and USB devices freezing soon after OS loads

  - by Andrew

  I run Ubuntu/Windows dual boot. Last night I started the upgrade to Ubuntu 12.04, and my computer has not worked since in either Windows or Ubuntu. Here's what I got when I rebooted after the upgrade, and continue to get every time I boot: Gets to GRUB screen OK. Choose Ubuntu - black screen or crazy purple lines. At first I assumed something went wrong with the upgrade (often happens). Choose Windows - works fine, I log in, but soon after that the graphics freeze (sometimes with purple artifacts). The keyboard and mouse (both USB) also lose power at the same instant, and none of the USB ports have power to them. This happens sooner or later every time I boot. Update: the HDD also appears to lose power at the same point. I have tried a live CD, but my computer refuses to boot any CD even after disabling all other boot options in the BIOS. I have disconnected everything except keyboard, mouse, graphics card with one monitor, one RAM sick and HDD; no change. I also took the little battery out to reset CMOS. I am pretty sure no matter how wrong the Ubuntu upgrade went, it wouldn't cause the above symptoms in Windows. So the only explanation I can think of is that a hardware failure occurred at the same time. Some possible causes of this I can think of are: A couple of days before this, I added a third screen (which worked fine). About a week before, my house lost power in a storm (no ill effects over the past few days though). What can I do, other than buy a new motherboard/CPU and hope it works? Unfortunately I don't have another box to swap parts into to test at the moment.

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• udev: waiting for uevents to be processed on my Gentoo

  - by stan31337

  During the startup I see machine executing this thing for about 30 seconds: udev: waiting for uevents to be processed Then I get a quick message which says something like: devfs: timeout (50 seconds) I can't see the whole thing because after that system starts up very fast including Xfce. What logs and configs do I need to provide for further investigation? $uname -a Linux genta 3.6.6-gentoo #1 SMP Sun Nov 11 11:02:23 NOVT 2012 i686 Genuine Intel(R) CPU T2300 @ 1.66GHz GenuineIntel GNU/Linux Thank you! UPD: rc-status genta / # rc-status sysinit Runlevel: sysinit dmesg [ started ] udev [ started ] devfs [ started ] genta / # rc-status boot Runlevel: boot hwclock [ started ] modules [ started ] fsck [ started ] root [ started ] mtab [ started ] localmount [ started ] sysctl [ started ] bootmisc [ started ] hostname [ started ] termencoding [ started ] keymaps [ started ] net.lo [ started ] swap [ started ] urandom [ started ] procfs [ started ]

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• SSD, AHCI and write performance

  - by Dan

  We've started to deploy SSD drives to our developers workstations. At this moment we're having the unpleasant surprise that the systems using the new SSDs often freeze, with the HDD activity led blinking or being continuously on. Benchmarks shows read speeds around 180 MB/s, but write speeds around 5 MB/s. All developers are using Windows 7 Enterprise, 64 bit, SP1. One of our developers suggested (based on his experience) the following sequence: backup the workstation use a tool to completely erase the SSD make sure AHCI is enabled in BIOS install Windows restore from backup So far, this procedure seems to work (we're still testing, but write speed seems to be 120 MB/s). There are some questions in this context: why do we have to completely reinstall Windows? Is it possible to clean the SSD without reinstalling Windows? Is there a reliable tool? If AHCI was disabled when Windows was installed and we enable it, shouldn't this be enough to correct the write performance issue? If we have to completely erase the SSDs, does this mean the SSDs we've received were used before (SH)? I'm wondering this because the package I've got was open (I didn't think about it at that time, as I considered one of my coworkers simply took a peek inside the package). Has anyone seen a similar problem before?

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• Installing 64-bit Ubuntu alongside 32-bit Ubuntu?

  - by Macha

  I have a 64-bit processor in my PC, but because of worries over application compatibility, up until now I have been using 32-bit Ubuntu (and 32-bit Vista because Dell wouldn't sell me 64-bit with my PC). Is it possible for me to install 64-bit Ubuntu alongside 32-bit ubuntu and 32-bit Windows Vista, so I can choose between them at boot and share data, and without uninstalling my 32-bit Ubuntu? My partitions are as follows Drive 1: 10 GB Vista recovery partition (E:), 240 GB Windows NTFS parition (230 GB used, C:). Drive 2: 167 GB Windows NTFS Partition (130 GB used, D: ), 8 GB swap partition, 13 GB / partition (6 GB used), 62 GB /home partition (20 GB used).

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• How long should diskpart take?

  - by sam

  I am using diskpart to extend a drive that is actually a VHD. I've already extended the VHD. It's on Windows 2003 and the C drive doesn't contain the swap file and the available space is contiguous. However didn't see the Note about the Resource Kit diskpart for download is not for Windows 2003. So I did the extend using the Windows 2000 version. Not sure if this is the reason but Diskpart is sitting there now for about 15 minutes or so and it's only gotta extend by 10GB. Should it be taking this long? Am I asking for trouble now that I've used a Windows 2000 version of diskpart on a Windows 2003 machine (VM)?

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• VirtualBox - split partitioned VDI into separate VDIs

  - by mathematical.coffee

  I'm very new to VirtualBox. I set up an Arch Linux VM and a Ubuntu VM (Ubuntu host), both sharing the same .vdi like so (I had in my mind a dual-boot situation): VDI file (25GB) |- /dev/sda1: 5GB (Arch Linux) |- /dev/sda2: [Ubuntu] |- /dev/sda5 (swap, 1GB) |- /dev/sda6 Ubuntu /, 9GB |- /dev/sda7 Ubuntu /home, 10GB I've now realised that I don't want a dual-boot-type setup, I'd rather boot each machine independently (my initial thought was to share /home between Ubunto and Arch). So, my question: Can I split /dev/sda1 and /dev/sda2 each to their own .vdi files so I can use them as completely separate machines? I'd rather not have to re-install either Arch (because it took me ages to work it out!) or Ubuntu (because I've already done a few GB of updates and don't want to redo them). I haven't been able to find anything about this - most questions I see are about converting a .vdi to a partition on the host, or splitting a .vdi into multiple smaller files (that are not independent), or converting a partition on the host to a .vdi file. cheers.

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• Windows Vista Home Premium upgrade to Windows 7 Ultimate

  - by chugh97

  I have 2 laptops with Vista Home Premium editions. I bought the upgrade license from MS, to upgrade one of my laptops. I have upgraded one of the laptops fine. Now the question is, If I want to upgrade the second laptop but uninstall the windows 7 on the first one, would this be possible. I am only wanting to swap the OS onto the other laptop as the other one is faster. Is this possible? and if so how can it be done?

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• Windows Vista home premium upgrade to Windows 7 ultimate

  - by chugh97

  I have 2 laptops with Vista Home Premium editions. I bought the upgrade license from MS, to upgrade one of my laptops. I have upgraded one of the laptops fine. Now the question is, If I want to upgrade the second laptop but uninstall the windows 7 on the first one, would this be possible. I am only wanting to swap the OS onto the other laptop as the other one is faster. Is this possible? and if so how can it be done?

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• Windows Vista Home Premium upgrade to Windows 7 Ultimate

  - by chugh97

  I have 2 laptops with Vista Home Premium editions. I bought the upgrade license from MS, to upgrade one of my laptops. I have upgraded one of the laptops fine. Now the question is, If I want to upgrade the second laptop but uninstall the windows 7 on the first one, would this be possible. I am only wanting to swap the OS onto the other laptop as the other one is faster. Is this possible? and if so how can it be done?

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• Are Motherboards for the Acer Aspire One AOA150 Netbook Compatible with the AOA110?

  - by Mindstormscreator

  I have an Acer Aspire One ZG5 AOA110-1588 netbook, and the motherboard doesn't have a port for a SATA 2.5 inch hard drive; it only supports this slow 8GB SSD type drive. Through research I've discovered that the AOA150 motherboards do have a SATA slot, and the bottom plate of these laptops have an appropriate protrusion for the drive to fit in (for example, compare this to this). The AOA110 and AOA150 models are very similar in appearance and specs. I've even seen tutorials that involve soldering a SATA connector onto the AOA110's motherboard, essentially creating an AOA150 motherboard (right?) So, could I just swap out the motherboard in my netbook with the MBS0506001? (I'd post another link to the actual board but can't because of the spam prevention...) I assume I would also need to purchase and replace the bottom cover with a larger one and possibly get a hard drive caddy as well...? Thanks!

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• Innodb : cannot allocate the memory for the buffer pool

  - by mingyeow

  My innodb keeps crashing. This is the error message below. Does anyone know why this keeps happening? InnoDB: by InnoDB 49201616 bytes. Operating system errno: 12 InnoDB: Check if you should increase the swap file or InnoDB: ulimits of your operating system. InnoDB: On FreeBSD check you have compiled the OS with InnoDB: a big enough maximum process size. InnoDB: Note that in most 32-bit computers the process InnoDB: memory space is limited to 2 GB or 4 GB. InnoDB: We keep retrying the allocation for 60 seconds... 0 processes alive and '/usr/bin/mysqladmin --defaults-file=/etc/mysql/debian.cnf ping' resulted in /usr/bin/mysqladmin: connect to server at 'localhost' failed error: 'Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)' Check that mysqld is running and that the socket: '/var/run/mysqld/mysqld.sock' exists! InnoDB: Fatal error: cannot allocate the memory for the buffer pool [ERROR] Default storage engine (InnoDB) is not available

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• why would you create two different subnets on the same physical network?

  - by xirtyllo

  I'm working at a messy location, one of the strange (for me) things is that on the same physical network there are two different subnets. Specifically some computers will have 10.0.0.0/24 and some others will have 172.16.0.0/24. There is only one DHCP server, which gives IPs on the 10.0.0.0/24 range, and there are two internet gateways, one with IP 172.16.0.1 and one with IP 10.0.0.1 . To give an example, I can easily swap one PC from one subnet to the other just by changing its IP and gateway settings. I am trying to imagine why they created the network this way, and which may be the possible advantages and/or drawbacks of having two different subnets on the same physical network. Any thoughts?

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• Is it possible to fake a Windows install for grub to add to boot menu?

  - by Mussnoon

  When doing a fresh install of a Linux distro (Ubuntu, for instance) on a fresh hard drive, if I want to install Linux first, and Windows later, is it possible to make grub think there's a Windows install on the first partition so that it'll be added to the boot menu after the installation is complete? To illustrate, I have a new hard drive and have created two primary partitions (both still raw) and two logical (Ext4 and Swap). I want to install Ubuntu on the Ext4 partition first, and some version of Windows on the first primary partition only after that (because I currently don't have a Windows install disk, but do have one for Ubuntu). Is it possible to make Ubuntu add an entry for Windows right now and avoid having to repair grub after I've installed Windows?

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• Intermittent CNAME forwarding

  - by Godric Seer

  I host a personal website on an old desktop that is LAMP based. Since I have a dynamic IP, I use no-ip to make sure I have a working domain name at all times. I also have a domain I have bought on GoDaddy where I have a CNAME record forwarding the www subdomain to my no-ip domain. At all times, I can connect to my website through the no-ip domain without issue. For the past several weeks, I never had an issue using the GoDaddy domain to connect (ssh or https). As of today, however, the GoDaddy domain only works for about 10 minutes at a time. I get server not found errors most of the time. Also, if I happen to be using the GoDaddy domain for an ssh connection, the connection will freeze. I have attempted to run tests using a couple of online DNS check websites, but have not gotten any errors at any time. I also contacted GoDaddy support but they had no issues connecting to the website, and therefore did not see any issues. I would like advice on how I could debug/resolve this issue. Since the problem appeared without me changing anything on my end, I hope it will resolve itself, but knowing the cause in case it happens again would be preferable. EDIT: I changed the configuration in GoDaddy to create an A (Host) that points at my current IP. This works fine, so I can access the site through the GoDaddy domain without the preceding www. I am currently waiting for a new CNAME record to propagate that points the www subdomain at the main host, rather than my no-ip domain.

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• Is it possible to mount a hot-swappable drive when it is turned on?

  - by John

  In my PC, I have a hot-swap drive. Usually I keep it off to save power. I only really use it when accessing from another PC on the network. Is it possible to configure /etc/fstab to mount this drive when I turn it on (without having to shake the mouse, open file manager and click the drive to have it mounted? Currently, I have: UUID=a869e5ca-7d3b-4d64-91e2-eadbecd8c9e5 /media/i-TVShows ext4 rw,nosuid,nodev,auto,user,uhelper=udisks 0 0 in my /etc/fstab file but it doesn't seem to do the trick. I want the drive to be user-mountable, on power on, with RW access, and I'm thinking of adding 'nofail'...this is my first time writing to the fstab file, and a lot of the parameters I took from the output of 'mount' so feel free to correct any oddness you find. Thanks

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• How to migrate a running KVM (with full disk copy) to another node?

  - by klipz

  I'm doing tests on KVM, and I'd like to see if I can make a hot migration, I mean the virtual machine won't stop running during the migration (but a few seconds of freeze is ok). I use a small cluster for my test : kvm1, kvm2, and kvmnfs. kvm1 and kvm2 runs the virtual machines kvmnfs is a NFS server, and it's mounted on /KVM on both kvm1 and kvm2 To migrate a VM (only RAM in fact) from kvm1 to kvm2, I run the same kvm command on kvm2 (with -incoming tcp:0:4444) that on kvm1, then I use "migrate -d tcp:kvm2:4444" : It works great, since the VM file is common to both machines. Now, I wan't to make a full migration (RAM + disk) of a local VM file (no more NFS) of kvm1 to kvm2. I tried to create an empty file, with touch, on kvm2 and use the same kvm command line + the "-incoming ..."). Then on kvm1 I use "migrate -d tcp:kvm2:4444" : It copies everything, then... the VM fails (any I/O disk gives an I/O error) ! And my VM file on kvm2, the one I created with touch, as still a size of 0 bytes. What am I doing wrong ? What is the exact command to use on kvm2 ? And what is the command to launch, in the monitoring mode, on kvm1 ?

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• Probability of failure with larger number of network elements

  - by MikeKulls

  I'm having a discussion with a work colleague. I'm saying that a network with 100 elements will have pretty much 10 times as many failures as a network with 10 elements, ie a tech will need to replace faulty hardware 10 times more often. He suggests that the failure rate doesn't go up in a linear fashion and the failure rate will be significantly less than 10x, in fact only slightly more failures. This is not the probability of an outage etc, we are just talking in relation to the amount of parts that a tech would need to swap out in a given time frame.

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• Can I trust that ZFS is consistent between Linux and FreeBSD?

  - by iconoclast

  I'm planning to build a FreeNAS box sometime soon, but if ZFS on Linux eventually proves to be reliable, I might want to switch, just to have a more familiar OS. So I'm wondering if I can trust that the different implementations of ZFS are compatible. In other words, if I just swap out the boot disk from FreeNAS to Linux or OpenIndiana, can I trust that nothing bad will happen to my data? This may seem like a stupid question--obviously it ought to be compatible--but I'm guessing that ZFS isn't commonly used in cases where drives are moved between computers, so I'm hoping someone can provide a better answer than just "it ought to be".

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• partitioning problems

  - by Remus Rigo

  I had on my laptop a dual system (Ubuntu 11.04 and Windows 7) and someway the partitions messed-up. Windows stopped from booting, I just got a blinking cursor, but Ubuntu worked fine. I tried to fix the windows boot (fixmbr, fixboot, bootsect /nt60 C:/....) but now grub was overwritten and I have no OS. Finally I formatted the hdd (low format), installed Windows, partition hdd with paragon partition manager and now I want to install Ubuntu, but Ubuntu sees an empty hdd, weird, can anyone tell me what can I do? EDIT: I have created: partition 1: 100MB ntfs - windows reserved (drive B) partition 2: 50GB ntfs win 7 (drive C) partition 3: 50GB ext3 linux partition 4: 'the rest' ntfs for data (drive E) (the swap i will create after)

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• Securely wiping a file on a tmpfs

  - by Nanzikambe

  I have a script that decrypts some data to a tmpfs, the directory is secure (permissions), the machine's swap is encrypted (random key on boot) and when the script is done it does a 35 pass wipe (Peter Gutmann) of the cleartext on the tmpfs . I do this because I'm aware wiping files on a journaling file system is insecure, data may be recovered. For discussion, here're the relevant bits extracted: # make the tmpfs mkdir /mnt/tmpfs chmod 0700 /mnt/tmpfs mount -t tmpfs -o size=1M tmpfs /mnt/tmpfs cd /mnt/tmpfs # decrypt the data gpg -o - <crypted_input_file> | \ tar -xjpf - # do processing stuff # wipe contents find . -type f -exec bcwipe -I {} ';' # nuke the tmpfs cd .. umount -f /mnt/tmpfs rm -fR /mnt/tmpfs So, my question, assuming for the moment that nobody is able to read the cleartext in the tmpfs while it exists (I use umask to set cleartext to 0600), is there any way any trace of the cleartext could remain either in memory or on disk after the snippet above completes?

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• where is my free space

  - by doug

  Hi there I'm using Pinnacle Studio 12 to edit some videos and as you can guess it use a lot of resources. The problem is that it eats all my free space from the C drive and after i close the application i don;t get back my free space. I assume it does some swap files but where and why it doesn't delete them? I don't store the project and saved files on C drive. I'm running Pinnacle Studio 12 on a XP sp3 Windows machine. I've tried to clean my system with CClean, but it doesn't find/see where my space is lost! TY

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