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• PHP unable to allocate memory.

  - by AlReece45

  On my way to the office this morning, every website on our shared VPS started giving the same error (several times, not the typical memory_limit error which is fatal): Warning: Unknown: Unable to allocate memory for pool. in Unknown on line 0 The shared server is a 64-bit OpenVZ container running cPanel. There are only ~6 VPSes on the host-- this is the largest one at only 4GB. The host itself has 24GB RAM. As the below graphs show, the memory usage on the host and VPS are both rather low. CPU Usage/Disk/Host all seem to be normal. RlimitMem was set to 583653034, yet the memory usage is about the same as it usually is. Apache 2.2, PHP 5.2 (mod_php) Restarting Apache has corrected the problem for now. However, I'd like to prevent it from happening again and I'm not sure what was limiting the memory. RlimitMem was set to 583653034, yet the memory usage is about the same as it usually is. There's seems to be plenty of memory: what caused this error? VPS Memory Usage Host Memory Usage APC Information apc.ttl=0 apc.shm_size=0 apc.mmap_file_mask=(blank) 1 Segment(s) with 32.0 MBytes (mmap memory, pthread mutex locking)

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• Ubuntu 12.04 can't boot after installing with software RAID 1

  - by Bill

  I've been trying to install Ubuntu with software RAID on my server and there is obviously something that I don't understand about the process. This is the guide that I followed: https://help.ubuntu.com/11.04/serverguide/advanced-installation.html I have two identical 1 TB disks in my server. I went through the initial install process and manually set up my partitions. On each disk I set up: (1) 100 MB partition for EFI boot (I didn't originally have this but added it based on a forum post I found after my original install failed to boot, I ended up with EFIboot since that was what the 'guided partitioning' decided to do) (1) 970 MB partition for / (1) 30 MB partition for swap I then created new RAID 1 disks combining the two partitions, one from each disk, such that each partition is mirrored. I then configured their usage as stated above. After saving the configuration I said yes to boot in a degraded state. The rest of the setup went normally, no errors of any kind. I saw GRUB being installed and again no errors. However, after rebooting the server I get the dreaded 'Insert boot media' and nothing happens. I loaded up the recovery disk and the mdadm configuration looks correct. md0 is my EFIBoot partition md1 is my \ partition using ext4 md2 is my swap partition Running file -s /dev/md0 doesn't indicate that GRUB is there and so I attempted to reinstall GRUB using the recovery disk. I selected the md0 disk and it appeared to install just fine. Running file -s /dev/md1 shows the error needs journal recovery, I'm not sure if that's related or not or how to fix that. Rebooting gives me the same problem, no boot media found. I've searched around the internet but can't figure out what to do next or more importantly how to troubleshoot what exactly is going wrong. Thanks!

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• WD Caviar Green Extremely Slow

  - by Steven

  I am encountering a really weird problem on my WD Caviar Green HDD. Well first of all I have 2 HDDs on my Desktop, one 160GB Seagate holding my Win7 Ultimate x64 and the problematic one, WD 1.5 Caviar Green for storage purpose. My problem is kinda weird, when I transfer files from my Seagate(C:) to my WD (D:) the speed is good (50-60MB/s). Then the problem arises when I transfer too "many" large files, the transfer speed would go straight down to kilobytes/s. Well after I cancelled the transfer and access my D:, even entering a folder requires loading for like 10 seconds. Such problem not only arises when I am transferring files to my D:, it seems like my WD can't handle much activities. For instance, last time I installed my game on D: and I would face much lag after playing for some time. When the same game is installed on C: no problem arises. Does anyone knows what is the problem? P/S: There was one temporary solution that I used to tried. After the "situation" occurs, I tried to access as many folders on D: as I can and let it load, repeating such actions and giving it some time bring the D: back to speedy transfer. However, large transfers would causes the situation to happen again. Does it have something to do with cache whatsoever?

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• Windows 7 'Unidentified Network'

  - by Throdne

  So my internet was working last night before I went to bed and woke up to a computer that is showing unidentified network. I have tried multiple ways of fixing it. > route delete 0.0.0.0 > uninstalling drivers - restart - reinstall from downloaded drivers > ipconfig /release - /renew > static IP > speed & duplex from auto negotiation to 1.0gbps full duplex > and also changed my network address to no value to 1234567890ab (not in that order) nothing seems to work. I have Comcast internet and when I connect the computer to the modem it works perfectly. but when I connect it to my router again, Unidentified network. I know my router isn't faulty, because my macbook pro, server, NAS, iPhones, and iPads are still working. I have also tried moving the port on the router, still same problem. my router is a: Cisco Small Business RVS4000 motherboard: GIGABYTE GA-990FXA-UD3

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• Disk operations in windows 7 are slow

  - by Skadlig

  My computer started lagging last Sunday. I tried to reboot it and it failed. Trying to boot into failsafe mode takes around two hours. It mainly freezes on two files: scsiport.sys and classpnp.sys When it finally has started all disc operations are really slow. When it has run for a while it goes faster, probably due to data moved into RAM instead. It froze on an other file before that was associated with Avast but uninstalling it didn't really help. A critical windows update was installed on Sunday but rolling back the update didn't help. I had a guess about the sound card but disabling the sound card drivers also didn’t help. I have an inkling of an idea that it might be Intel rapid storage technology that might be acting up but it doesn't allow me to reinstall it from failsafe mode and I haven't been able to log into normal mode for a while. I would appreciate suggestions regarding how to get into normal mode again and/or what can be the root cause.

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• Linux as a gateway (no NAT)

  - by Hugo

  I'm trying to configure a linux server as a gateway/router, but I can't get it to work, and all information I've managed to find is NAT-related. I have a public IP block for the gateway and devices behind it, so I want the gateway to simply route packets to the internet - again: no NATing! I've managed to get the gateway to access the internet successfully (that was just a matter of configuring the IP and GW), and the computers behind it can communicate with it. [EDIT: more info] This is actually an IPv6 block (2800:40:403::0/48) (but I've found that most utilities and instructions can be easily adapted from IPv4 to IPv6 with little hastle). The server has too ports: wan: 2800:40:403::1/48 lan: 2800:40:403::3/48 One of the computers behind it is connected to it via a switch; 2800:40:403::7/48 The wan interface on the server can ping6 www.google.com without issues. The lan interface on the server and the client can mutually ping each other without issues (as well as SSH, etc). I've tried setting the server as a default gateway for the client, with no luck: client # route -A inet6 add default gw 2800:40:403::3 dev eth1 server # cat /proc/sys/net/ipv6/conf/all/forwarding 1 I don't want any filtering/firewalling/etc, just plain routing. Thanks.

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• Can't do anything with Ext. HDD, ".Trashes" is probably the boogyman. (On a MAC!)

  - by Sander Schaeffer

  I bought a external Harddrive today, A Samsung. But I'm not able to do anything with it A few notes on that. I can't put anything on the harddrive. It keeps on 'preparing copying files' I can delete anything on the harddrive system files, except the folder ".Trashes". It gives error 'Unexpected error: -50' I've tried to empty my own trashcan, no changes. I've set the file permission on the .Trashes to read/write everyone, doesn;t change a thing Trying to format the whole drive with DiskUtility, but quits at start, because the drive cannot be deactivated I've tried a few terminal commands sudo -s -r rf /Volumes/Untitled\ 1/.Trashes - Directory not empty -r rf /Volumes/Untitled\ 1/.Trashes - no permissions Also cd /Volumes ls -al cd name_of_partition ls -al -rm -rf .Trashes Again: Permission error. Also: I can't change drive permissions via Disk Utility, via the button 'recover drive permissions', because it is 'blank' I really can't figure out how to delete .Trashes, format the drive or get the damn thing working. Any suggestions? p.s. If this is the wrong Stack Exchange site: Please redirect me!

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• Microphone doesn't work

  - by mandy

  I'm having a trouble with my built in microphone. Even if I use headphone with mic, it doesn't really work. The weird thing is, if I clap the green lines of the speaker icon jumps, but if I speak it doesn't. I have also tried some recordings, but I can not hear myself and adjusting the volume didn't help at all. I tried to restore it, still no change. I have updated it in the device manager, but it said there that it's up to date and the devices are working properly. Until I decided to recover the whole system (wherein I pressed zero and switch on button) to my surprise, the settings became different, most programs were deleted, even my files. It's like it was formatted and I'm so sad that the mic was not fixed. I really don't know what to do now. My laptop model is Toshiba satellite m840. I want to it return to its settings/set up just before I Recover the system and bring back all the programs that we're installed and of course, most of all, to fix my microphone so I can use Skype again and other video calling application.. I hope someone could help me. Thanks a lot!

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• How does one debug Windows network share authentication?

  - by ajs410

  I have machine0 with 32-bit Vista, logged in as a domain user, running a VMWare image of 32-bit Vista, logged in as a local user, with the VM set to bridge the network. From an administrator account (called admin) within the VM, I try to access the hidden C$ share on machine0 (i.e. start - run - "\\machine0\C$\"). I get no prompts for credentials. Worse, machine0 has an admin account (different password), and machine0\admin gets locked out when VM\admin tries to access the network share. I get a message several seconds later, which feels like a cached credential failure leading to the lockout. I have checked several places for cached credentials; net use, Stored Usernames and Passwords, mapped shares. I rebooted (both machine0 and VM) to make sure the session was clear of any cached credentials. I can force net use to use my domain credentials when accessing machine0, and then I can see the share. I can also see shares that do not require credentials. I decided to try another machine on the network (machine1), 64-bit Vista, local user. This machine has no lockout policy, and after several seconds (feels like failed cached credentials again) it prompts me for credentials. After I enter them, it re-prompts me, saying "logon unsuccessful" (tried my domain credentials, and also machine1\admin's). Which is bogus, because I proceed to log on with remote desktop using the machine1\admin credentials. I have tried this on another machine (machine2, 64-bit Vista), running a copy of the same 32-bit VM, and I don't remember having this problem. machine0 has a fingerprint reader...could that try storing passwords and interfere? Are there any places I'm missing where there could be cached credentials? Is there a way to see what credentials are flying around when I try to connect?

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• How to safely move where itunes saves music/iphone apps/and meta data to another internal Drive?

  - by GingerLee

  In the past, when I have moved my itunes data from one computer to another, I usually just follow these steps: Copy the contents of two folders: %USERPROFILE%\Music\iTunes %USERPROFILE%\AppData\Roaming\Apple Computer 1) Install iTunes on the new computer, start it and close it (don't let it search for music). 2) Copy all the files in the above folders from old PC to new PC. 3) Start iTunes and authorize the new computer (and deauthorize old one). 4) Before syncing, update all iphone apps to current versions on both my iphone and in itunes. 5) The Sync. The above steps always work for me, and basically Itunes on my new PC works exactly as it did on the old PC. My Question: In the hopes of bybassing the above steps in the future, I would like to just have Itunes use another internal Drive that I use for file storage (e.g. D:/) as the path for the above two directory? Then if I move to new PC again, I could just setup itunes to use the correct path. Is that possible yet with minimal implications? If so how?

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• Blue screen of Death on Install

  - by Toby Allen

  I have a machine with Windows Vista Installed. It has an Intel X25 SSD as the System Drive I want to reinstall (I plan to format and overwrite Vista) with XP. When I boot up using the Dell XP CD it loads the initial drivers then i get a Blue Screen. This is quite concerning. The installed OS works ok, but its giving problems so I want to remove it. Should I just format the SSD and try again? Will this make any difference? Can I do something to avoid hitting the Blue Screen? Its possible I had corrupt sectors on one of the other disks, will a new XP install use the System drive or drive 0? Can I force the install to use a specific drive when installing? Error: *** STOP: 0x0000007B (0xF78D2524,0x0000034,0x00000000,0x00000000) I never did find the answer, however I removed the SSD and tried to install on other disk - CRASH I disconnected the other disk and tried to install with only SSD plugged in - CRASH I removed 1 block of RAM - CRASH I used a windows 7 CD - NO CRASH

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• Subsequent runs of rsync locally don't reduce data transferred

  - by sharakan

  I have an EC2 instance with data I want to sync to a mounted, but remote, volume, as a backup. rsync seems like the way to go with this, so as a test I took my test file (a Postgres pg_dump file) and used rsync -v to copy it to the mounted volume: [ec2-user work]$ rsync -v dump.sql.1 ../backup/dump.sql dump.sql.1 sent 821704315 bytes received 31 bytes 3416650.09 bytes/sec total size is 821603948 speedup is 1.00 Then, I ran it again, expecting to see minimal sent/received numbers because it would just be checksums. Instead... [ec2-user work]$ rsync -v dump.sql.1 ../backup/dump.sql dump.sql.1 sent 821704315 bytes received 31 bytes 3402502.47 bytes/sec total size is 821603948 speedup is 1.00 I'm new to rsync so perhaps I'm missing something, but isn't the idea that the source and destination files are checked for differences, and then a patch is generated and applied to the destination? Why is this not reducing the amount of data 'sent' to just the size of the checksums? Some background if it's relevant: the mounted volume is using s3fs, mounted with s3fs <bucketname> backup.

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• Apache with multiple domains, single IP, VirtualHost is catching the wrong traffic

  - by apuschak

  I have a SOAP web service I am providing on a apache web server. There are 6 different clients (IPs) that request data and 3 of them are hitting the wrong domain. I am trying to find a way to log which domain name the requests are coming from. Details: ServerA is the primary ServerB is the backup domain1.com - the domain the web service is on domain2.com - a seperate domain that server seperate content on ServerB ServerA is standalone for now with its own IP and DNS from domain1.com. This works for everyone. ServerB is a backup for the web service, but it already hosts domain2.com. I added entries into the apache configuration file like: <VirtualHost *:443> ServerName domain2.com DocumentRoot /var/www/html/ CustomLog logs/access_log_domain2443 common ErrorLog logs/ssl_error_log_domain2443 LogLevel debug SSLEngine on ... etc SSL directives ... </VirtualHost> I have these for both 80 and 443 for domain1 and domain2 with domain1 being second. The problem is when we switch DNS for domain1 from ServerA to ServerB, 3 out of the 6 clients show up in the debug logs as hitting domain2.com instead of domain1.com and fail their web service request because domain2.com is first in the apache configuration file and catching all requests that don't match other virtualhosts, namely domain1.com. I don't know if they are hitting www.domain1.com, domain1.com (although I added entries for both) or using the external IP address or something else. Is there a way to see which URL they are hitting not just the page request or someother way to see why the first domain is catching traffic meant for the second listed domain? In the meantime, I've put domain1.com higher in the apache configuration than domain2.com. Now it catches the requests for all clients and works, however I don't know what it is catching and would like to make domain2.com the first entry again with a correct entry for domain1.com, for however they are hitting it. Thank you for your help! Andrew

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• Is domain-transfer inherently safe for downtime when the name servers remain the same?

  - by jlmt

  I've been reading around this topic towards understanding whether there's some or no chance of downtime during an upcoming domain transfer for 15 live and very critical domains. In our case there are three companies involved: CompanyA is the original registrar and DNS host, CompanyB is the new DNS host, and CompanyC is the new registrar. I've already changed the nameservers for all domains to those of CompanyB. We suffered some downtime because CompanyA deleted their hosted DNS for our domains directly after the change, but the changes propagated and we're now able to configure our DNS with CompanyB. From what I understand (please correct where wrong!): There exists an SOA record that points oneofourdomains.com to ns.companyb.com. That record is maintained and authoritatively hosted by the ccTLD registry for the domain (eg. Verisign for .com). CompanyA currently has the ability to change the SOA record because they're the registrar. There exist NS records for oneofourdomains.com, which are also related to the link from domain name to nameserver, are similarly hosted by the ccTLD, and which CompanyA are also able to change while acting as registrar. Neither CompanyB nor CompanyC currently have any control over the SOA or NS records. CompanyA are unable to cause us (DNS) problems during the transfer by dropping service early, because they are not the authoritative source for the SOA and NS records. When we transfer the domains, it's administrative control of the SOA and NS records that will be transferred to CompanyC. As long as we advise CompanyC that the SOA and NS records must not change (as regards pointing to CompanyB's nameservers), there's no need for any kind of DNS change, and therefore no possibility of downtime. Is my understanding of this correct? My fear is that CompanyA will somehow cut us off again, and their support dept hasn't given me much confidence in their understanding of the topic.

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• Host is missing hostname and/or domain

  - by anlawang

  i use puppet 0.25.4 on ubuntu 10.04,when puppet installed ,i got the infor below : Nov 29 10:30:30 puppet puppetmasterd[4422]: Host is missing hostname and/or domain: pclient.example.com Nov 29 10:30:30 puppet puppetmasterd[4422]: Compiled catalog for pclient.example.com in 0.02 seconds i dont know how to fix it ,who can help me thank you ! my configuration : I use apt-get to install the puppet,so some configuration have been fixed puppet.conf on client : > [main] server=puppet.example.com > logdir=/var/log/puppet > vardir=/var/lib/puppet > ssldir=/var/lib/puppet/ssl > rundir=/var/run/puppet > factpath=$vardir/lib/facter > pluginsync=false > templatedir=$confdir/templates > prerun_command=/etc/puppet/etckeeper-commit-pre > postrun_command=/etc/puppet/etckeeper-commit-post > certname=pclient.example.com > node_name=cert [puppetd] > runinterval=30 puppet.conf on server: > [main] logdir=/var/log/puppet > vardir=/var/lib/puppet > ssldir=/var/lib/puppet/ssl > rundir=/var/run/puppet > factpath=$vardir/lib/facter > pluginsync=true > templatedir=$confdir/templates > prerun_command=/etc/puppet/etckeeper-commit-pre > postrun_command=/etc/puppet/etckeeper-commit-post i user the default node on site.pp i am a newer to puppet,so i dont know the reason for these problems!! thank you again!!!

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• PHP potential issues with compiling 5.3.8 extensions against RHEL 6 / CentOS 6 PHP 5.3.3 package

  - by user101203

  I'm working on getting a Red Hat 6 LAMP server going and while the PHP that comes with it has many extensions we use, it doesn't have all of them. To solve this, I was thinking about either compiling the PHP extensions which come in the ext folder of the downloadable source code of PHP 5.3.3 from php.net same as #1, but using the extensions from the latest PHP version (currently 5.3.8). Do #1 but manually decide which updates to backport from the latest version of the PHP extensions into the older version and then compile the backported result A drawback to #1 is that security and bug fixes come out which we wouldn't be able to take advantage of. A drawback to #3 is that it might be a lot of work Does anyone know what the drawbacks to #2 are? I don't want to go down that route if it might result in some unexpected negative outcomes. Also, are there any other drawbacks to the other options or a better way to go altogether? I want to use the PHP 5.3.3 which comes with the Linux distro because I don't want us to get to a place again where we are forced to upgrade to a new version of PHP to stay on top of security updates like from PHP 5.2.x to 5.3.x and there be backwards incompatible changes (this is the situation we're in now with PHP 5.2.x no longer being supported).

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• WIN7 constant BSOD 0x7B on boot, not producing any dump files where to go from here?

  - by prayingpantis

  So my one win 7 pc has been getting a BSOD on boot (roughly a sec after load screen starts) after a power failure. The complete stop code is 0x0000007B (0x80786B58, 0xC0000034,0x00000000,0x00000000) I've searched for quite a while now on the net and it seems like most people gave up after gettting 0x7B and no dump files. What I've tried so far: startup repair - reports it cannot repair computer automatically. BadPatch is reported somewhere in a problem signature contained in the problem details. startup repair with a WIN 7 CD - also fails, I can't recall what the error was, but it was not the same as the error produced with the start up tool shipped with the version of WIN 7 installed on my machine (I think the text had something ACL-ish contained in it) used a boot disk (Hiren's boot iso) - I used it to enable the CrashDump registry key and then after BSOD, read the HDD's dump locations but it was empty. Note, I'm quite sure the registry keys I edited are the correct ones, since the reboot on BSOD option was enabled by default and after I changed the regkey controlling this functionalitty to 0 the BSOD stayed after I booted again. check disk - works and returns no problems, also it seems I'm able to access all my files on the HDD. mem test - works and returns no errors So I'm not sure what else I can do to figure out what is the problem here. I read somewhere that you can use WINDBG to remote debug another PC, but I'm not sure if this is possible since the OS isn't even loaded yet? Also the last driver change I made on the system was installing a video driver, but I had no problems with it and were able to reboot several times until the power outage happened and the BSOD appeared. Any help or guidance for a way to DEBUG this problem would really be appreciated (I'm not really that keen to try a whole bunch of random fixes, I'd rather try and narrow down the problem first).

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• How to prevent an SSD from disappearing from BIOS

  - by Midimatt

  I've only recently upgraded my old machine to a new one with a brand new 60gb SSD as my boot drive and a 1TB main drive. Paranoid about completely breaking my SSD, I read up on a lot of issues that I needed to watch out for, including making sure AHCI was turned on and trim enabled. PC has been working fine for a few weeks now, until today. My wife was watching some TV on the machine when it started to act strange and eventually blue screened. She rebooted and the boot mgr was missing. When I got home from work I checked the BIOS and the drive had disappeared. I panicked and looked up some possible fixes, and I discovered a large amount of people having problems with the drive firmware, especially on OCZ Vertex and Agility drives, and my drive is an Agility 3 drive. The problems included blue screens followed by missing drives, and a solution was to reset the CMOS and try again. This worked, and now everything seems to be working fine. My question is, is there any way to prevent this from happening? Am I missing a setting for my SSD? All of the posts I found were from early to mid-2011 nothing for the end of 2011 to 2012. So I am wondering if I've missed anything. EDIT: Checked my drives firmware and it is 2.15, which has had issues reported by users.

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• Is the Windows VPN secure?

  - by Tor Haugen

  I have used a few VPN solutions over the years. Most are hard to set up, slow to connect and/or rather ill-behaved (replacing system drivers, disrupting each other etc). One solution I have never used earlier is the one built into Windows. This is mostly because the infrastructure guys always refuse to use it because they claim it's 'not secure'. Now I have finally had the chance to use it (on Windows 7), and wow, it's a breeze! Easy to set up, well-behaved, it connects almost instantly, automatically authenticates with my logged-in credentials, and integrates excellently with the UI. I have to say, unless it really isn't secure, I'll be happy if I never have to use another VPN product ever again. I gather the Windows VPN used to rely on PPTP, which is not considered secure. But in Windows 7/2008, it supports L2TP/IPSec, SSTP and IKEv2, and authenticates with EAP or CHAP/CHAPv2. That seems pretty up-to-date to me. But I'm just a lowly developer. Can someone in the know give me the lowdown on this?

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• SBS DC DNS entries going missing?

  - by Chris W

  I've been looking at a problem on a friends SBS (2003) server where the client PC's aren't able to connect to the server with a variety of errors reported. Checking the server itself the only indicator of an issue is an error 5782: Dynamic registration or deregistration of one or more DNS records failed with the following error: No DNS servers configured for the local system. Running a dcdiag reports that there are no DNS records registered for the DC so I fixed the problem by doing a netdiag /fix after which the dcdiag comes back clean and clients are ok again. It happened a few weeks ago as well and the same fix solved it. What are the possible causes of the DC DNS entries going missing? Is this a config option that needs tweaking or could it be solved by something simple like scheduling the SBS server to re-boot periodically? The only change they can think of that was made near to the time of the first instance of this problem occurring is that RRAS was started up to allow for a VPN connection from a home user. NB - The server is setup with a pair of NICs in a team so the server has a single virtual NIC providing both LAN/WAN connections to it. An external hardware firewall is in use rather than the windows firewall.

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• Curious enigma of a network cable / connection / quality

  - by Foo Bar

  So, the situation is like this: I'm renting an apartment in a large house and I'm sharing internet with the landlord who lives downstairs. The internet is (in my best guess) optical 20/20Mbit. I don't know how it's all wired in his flat (haven't been there / seen it). Anyway, in my flat comes a cable which seems to be connected directly to the optic to ethernet router (and the password is the default one, so I have access, he he). There was a switch connected to that and to wires that go around the flat, and the wiring is terrible. It's even mixing phone and ethernet, and from what I see some cables are even interconnected!? Anyways, this cable that comes to my flat is very short. I can barely connect my computer on it, but if I do, I seem to get decent speed / performance. Not great, but decent. If, however, I connect switch to it (tried 2 different switches and a wifi switch) it's all blinking but I can't even connect to 192.168.1.1 (the router). DHCP fails, ping is losing 80-100% of replies. So I connected this cable directly to the other cable which goes to my work room, with a connector that has two female jacks and no electronics. Now when I connect my computer in my room, again, the performance is decent. When I connect WRT54GL (with tomato, DHCP disabled) to it and I plug a cable in this WRT and to my computer... the performance is gone. Download seems okay on Speedtest, but upload is .2Mbps and it's connecting forever. So what kind cable troll am I having here? Any ideas?

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• How do I speed up and cache mmap file access over NFS on Linux?

  - by Zan Lynx

  The server and client are both 64-bit Ubuntu 10.04 LTS. The application in question is a custom app that uses mmap() for fast random file access. Its ideal state is when the entire file is cached in RAM. The network connections are really fast 10Gb Ethernet. It is a virtual server blade setup. It isn't the network connections slowing things down because everything performs superbly when using a virtual disk (iSCSI to the SAN). But when we run the application on a NFS home directory mount, performance goes to the dogs. It appears that the Linux kernel isn't caching anything. So it is reading every single disk block needed by mmap() accesses over and over and over again. The NFS mount is done through autofs, which has only default settings. /proc/mounts shows the NFS mount is done with the following options: rw,relatime,vers=3,rsize=131072,wsize=131072,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=192.168.11.52,mountvers=3,mountproto=tcp,addr=192.168.11.52 How can I make Ubuntu 10.04 cache the file instead of reloading it all the time?

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• Stronger laptop_mode in Linux

  - by Vi

  Can I have stronger laptop mode in Linux? I want to spin down the hard drive and prevent it to spin up even if something wants to read something not in cache. In general I want to have these modes: Normal Current laptop mode Stronger laptop mode: spin up only when needs to read something uncached (and cache it). No spinups to write something unless really memory pressure (Exception: explicit "sync" command in console). Kernel is allowed to keep processes in D-sleep for 10 seconds for that. Forced laptop mode: do not spin up, period. Keep offending processes in D-sleep unless I turn off this mode. Like there is a bomb instead of hard drive. I also want to have access times tracked (mount -o atime), but I don't want the hard drive to be spinned up only to update them. Is there some settings or kernel patches that can get closer to this? May be I should write special io scheduler for "forced laptop mode"? E.g. echo suspend > /sys/block/sda/queue/scheduler to lock the drive and echo cfq > /ys/block/sda/queue/scheduler to unlock it again?

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• Is my motherboard failing, or is there some other issue?

  - by ThatGuy

  So, several months ago I put together my own desktop PC. I set up a dual boot to Windows and Ubuntu. Recently, without changing any settings or installing anything new, the wifi stopped working on windows (I use a wifi adapter). It said it was connected, Network settings showed that it was working and running trouble shooting had no results. My internet still works on any other device. I found that removing the adapter from the motherboard and plugging it back in was the only thing that fixed the problem. Reinstalling the wifi drivers did not help. I purchased a new Wifi adapter, but the problem persists. More recently, I had a much more discouraging development. Sometimes, turning on the computer results in a boot loop: BIOS never starts. Instead, the monitor turns on as if it got a signal, then immediately turns off. This loops on it's own indefinitely until I hold down power, hard reset it, and try again. Sometimes it works, sometimes it doesn't. I haven't tested much on the Ubuntu side. It appears that wifi works at least some of the time, but since I've had issues just getting to BIOS I'm not confident the issue is on the software side. I've also noticed issues with some of the USB ports no longer working, but that seems to be off and on. Finally, as of a few minutes ago, I booted to windows to discover that everything was running very slowly. Slow here is a relative word, but I have a Samsung 840 pro SSD and I'm used to applications running nigh instantly, and it was a solid 3 minutes before any of my applications would load. Anyway, my question is this: Is it likely that my motherboard is failing? Either way, what steps can I take to try and pin down the problem and figure out what to do?

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• Server needs to ping outgoing before allowing connection

  - by QuintenVK

  Okay, first our setup: I'm currently working over VPN to a mac mini OSX 10.6 server. We have a testsetup VM running on that, using ubuntu 12.04. Earlier today, there was an outage because of which our mac mini server was reset. Since then, i was unable to initiate a connection to the VM (which i did boot) -- no ssh, no web, ... . I couldn't ssh or web from the mac mini to the vm either. I could do so from within the VM itself, though. Ping did work on all machines. Lastly, I tried pinging from the VM to my laptop. It took a moment, but then it finally started to ping (no timeouts or so). After that, web and ssh magically worked. I then didn't use the machine for about 5 minutes, after which i had to ping from the server to my laptop again before i could setup a connection. I'm in the dark on what this could be, though I think this is something to do with lookups.

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