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  • Synchronization between user space process and interupt context code

    - by user1748950
    Recently I attended couple of interviews. Out of all kernel questions which were asked, thr is one specific question which I couldnt find convincing answer of. How will you use different synchronization techniques while sharing data between user space process and interrupt context function? My convincing answer was: In interrupt context code: 1. do *spin_lock_irqsave* 2. access data buffer which is shared between user space app and kernel 3. do *spin_lock_irqrestore* Then this was not convincing answer. Do I have to do irqsave and irqrestore in all the instances of data access? Regards, Yogi

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  • AsteriskNow Migration / Shared Extension Space

    - by Aaron C. de Bruyn
    I am testing the possibility of migrating from an old Avaya phone system to AsteriskNow. The migration would cover several hundred phones--but spread out over several years. (Management wants to move buildings to the new phone system one by one as cables get cut or time permits.) Two other directive is that extensions must not change and they want a GUI that other admins (non-Linux geeks) can manage. They currently use 9XXX for all extensions. We linked the Avaya and Asterisk box via PRI card and they both are communicating. From the Avaya side, if we move (for example) extension 9001 to Asterisk, we forward the call over the PRI to the AsteriskNow box and the SIP phone rings. In AsteriskNow we have an outgoing rule '_9XXX' that routes all 4-digit extensions starting with 9 back to Avaya. Here's the trouble. Dialing 9001 (the extension moved over to AsteriskNow) causes the call to be routed out the PRI to the Avaya box, then the Avaya box routes the call back to Asterisk, and Asterisk routes it to the SIP phone. As we get more and more users switched over, it will use up more and more channels over the PRI card. Is there a way I can ask Asterisk to check it's local extensions first--then forward off to the Avaya system if it starts with '_9XXX'? (I know how I can do it when editing the raw config files, I'm just looking for a way to do it in the GUI so other admins can manage it if necessary.) As a last-ditch plan, I know I can specifically add '_9001' as an outgoing call rule and sent it directly to extension 9001--but I'd really hate to do that for several hundred phones

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  • AWS Large Instance: /mnt does not show all the space that should be available

    - by Emile Baizel
    I just created a Large (m1.large) 64 bit instance which comes with 850 GB instance storage. Look at the Large Instance http://aws.amazon.com/ec2/instance-types/ A 'df -h' from the root folder gives me the output below. The /mnt is where I'm thinking the instance storage is but here it is only showing me 414G. I have set up two servers and both are showing the same numbers. root@ip-11-11-11-11:/# df -h Filesystem Size Used Avail Use% Mounted on /dev/sda1 7.9G 1.1G 6.5G 14% / none 3.7G 112K 3.7G 1% /dev none 3.7G 0 3.7G 0% /dev/shm none 3.7G 48K 3.7G 1% /var/run none 3.7G 0 3.7G 0% /var/lock /dev/sdb 414G 199M 393G 1% /mnt

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  • What and why is my swap space used under linux

    - by Fabian
    on my linux system I get these stats from top: Tasks: 155 total, 1 running, 153 sleeping, 0 stopped, 1 zombie Cpu(s): 1.5%us, 0.3%sy, 0.0%ni, 97.4%id, 0.7%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 8177180k total, 2025504k used, 6151676k free, 44176k buffers Swap: 7999996k total, 495300k used, 7504696k free, 637612k cached There it shows me that my system is using 495Mb of swap. Why is this so? 6Gigs of ram are free. And if I would disable swap entirely the system would also work. Any explanation what the number really shows or who is swapping?

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  • Microsoft equation editor space problem

    - by Keshav Prasad
    Hello all, When I use the Microsoft equation editor, if I have a word that is greater than 10 characters in length, the equation editor automatically breaks the word and puts spaces in between them when the object is embedded in a powerpoint slide. For example- If I have the word "automatically" in the equation editor, it shows up just fine when I am editing the text in the equation editor. But when I update this object to the powerpoint slide, it shows up as "automatica lly". There is a tab or 5 spaces between "automcatica" and "lly". Is there any way to solve this problem? Thanks! -Keshav

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  • Microsoft equation editor space problem

    - by Keshav Prasad
    When I use the Microsoft equation editor, if I have a word that is greater than 10 characters in length, the equation editor automatically breaks the word and puts spaces in between them when the object is embedded in a powerpoint slide. For example- If I have the word "automatically" in the equation editor, it shows up just fine when I am editing the text in the equation editor. But when I update this object to the powerpoint slide, it shows up as "automatica lly". There is a tab or 5 spaces between "automcatica" and "lly". Is there any way to solve this problem? Thanks! -Keshav

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  • HP MediaSmart server system disk full

    - by Blanthor
    I have a HP MediaSmart Server (EX 490) with Windows Home Server out of the box. It comes with a single 1.0 TB drive partioned 20 GB for the System disk. The system disk keeps filling up. I haven't installed anything but McAfee. Without getting into the philosophical discussions of why they would partition it thus, what is the likely culprit of this debacle? My D: Partition has plenty of space. I can get into the server only through Remote Desktop.

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  • ESX 4.0 space: DASD, NAS, or ?

    - by thormj
    I put together an ESX box for better management, but its performance is a WTF item; I'm a noob at dealing with ESX, so I'm looking for a laundry-list of reading material to help me straighten this out so I can go back to .NET programming. Current storage system: We're running Raid5+Hotspare (8x500 GB spindles) on a PERC6i on a Dell 2910. Due to ESX limitatios, the PERC is showing the storage as 1x2TB + 1x800GB "partitions." I'm not sure of the setup's configuration (stride / stripe / ???) at all. Our Applications We have a SBS server as well as a minor (2x50 GB, but growing at 10GB/month) database server... Our application that lives on the database VM is CPU and I/O insense; it's a database churning excercise mixed in with a lot of computation on the data (fixing that performance is what I'm supposed to be working on)... Perfomance Issue When I do a backup, restore, or worse (copy a backup from 1 vm to another to move it to the QA VM), the entire system slows to a crawl (even "unrelated" VMs). I originally thought a DASD situation would be quite good since you had PCI-x bandwidth, but the systemwide slowdown is killing productivity. Questions What should I do to make an intelligent decision about NAS vs RAID vs SAN vs DASD? Are there sweet spots/ugly spots in the storage setup? Can you use a SSD PCI-X card in ESX for the tempdb? Good/Bad idea? Is there any way to "share" some image in a copy-on-write fashion? Most of the "Backup-Copy-Restore" is to "put a clean image on the dev boxes"; if I could have them "share" the master image, the "big copy" (2x50 GB) would only need to be done once per week instead of once per dev per week...[runtime performance isn't a concern with the dev boxes, but the backup/copy/restore kills production, SBS, and everything else on the box]

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  • Conflicting answers from du with different units

    - by dpitch40
    My question is quite simple. I get this output when checking the total amount of space I'm using on my Walkman. david@Milton:/media$ du -b --max-depth=0 WALKMAN/ 14823290693 WALKMAN/ david@Milton:/media$ du -k --max-depth=0 WALKMAN/ 14523776 WALKMAN/ Last I checked, 14,523,776 KB * 1024 = 14,872,646,624 B, not 14,823,290,693. Dividing the two, their "K" unit seems to be equal to about 1020.62 rather than 1024 as advertised. This is causing some errors in the program I wrote to sync my Walkman, so it fills up faster than it claims to. Can anyone explain this discrepency?

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  • Drive Shows No Files But Half Space Gone

    - by Chance Robertson
    I have a 500 GB USB drive. When I go to Windows Explorer or Finder, the drive shows that about half the drive is free. However, when I open either drive in Windows 7 or OS X, no files how up. I have tried to look at the files through the command line and nothing shows. A while back, I hooked it up to my MacBookPro and there was a quick message that said the drive was not ejected properly, blah, blah. And of course I did not read the message and hit OK. It there any way to get back my files from the drive?

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  • setting upload/space limit for FTP client

    - by tombull89
    As part of my web hosting plan i've also got a few domain hosted for family and friends. I have my own FTP account with full access and I would like to give FTP to a web designer and a user. Is there a way for restricing uploads larger than a certian size, or setting a size limit on the folder that the FTP access has access to? I'd rather not let them upload files ridiciously big. Thanks.

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  • replace a 'space' char in filename with an underscore

    - by user38730
    I have a bunch of files in a directory with 'spaces' in the filename. How do I perform a bulk rename of all filenames with 'spaces' and replace them with an '_' char. Looking at the other solutions, I've tried the following command w/o success: find . -name '* *' -exec rename ' ' '_' {} + find: rename: No such file or directory

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  • VMWare guest OS is not using full hard drive space

    - by syuusuke
    Hey everyone, I'm wondering if you can give me some insight on how to figure this out. I've recently virtualized a w2k3 server that had 10GB C:\ drive size. Once I finished virtualizing it, I expanded the disk to 20GB for C:\ and within guest OS (W2K3) computer management settings, you can see it recognizes as 20GB partition C:. But for some reason, if I opened windows explorer and see the properties of C:\, it will only show total size of 10GB. Does anyone know how to solve this or even had this problem before?

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  • reducing Windows 7 size

    - by Sejanus
    My Windows 7 uses around 16 GB while Windows XP only around 4 GB hard disk space. Seems weird. I use Windows only for gaming so I dont need a lot of stuff they have to offer. What is the best way to reduce Windows 7 size? What can I delete / uninstall and how? Also I'd like reduce RAM and processor usage as much as possible (as long as it doesnt hurt game performance)... turn off all that fancy stuff and so on. What can I turn off and how? Thanks in advance!

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  • HP Power Manager SMTP setup doesn't have space for username & password

    - by Martha
    Is there some way to configure HP Power Manager to not assume that there's an email server running locally? We recently acquired an HP T1500 G3 UPS, which we're trying to control using HP Power Manager 4.2. The main reason we wanted to get this particular UPS is because it says it's capable of sending notifications (of the "Yo, the power's out, you may want to look into it" type) via email, as opposed to SNMP. Turns out, that's not entirely true. The server is running Windows Server 2003. It is not running an email server of any sort - we do that via two different providers. Outlook email is provided by Verizon, and our SMTP email service is provided by a small local company. When we use CDO to send auto-generated notification emails, we have to provide the SMTP server name, port, username, and password. The HP Power Manager interface only allows us to enter the server name and the username. Thus, not surprisingly, the emails never go anywhere. Help?

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  • GParted tells me my partition has 1.30 GiB used space but I cannot access its contents

    - by reprogrammer
    I've a ext4 partition (/dev/sda7) for my Linux. And, another (/dev/sda5) for keeping my data. When I installing Ubuntu 10.04 LTS, I set the mount point of /dev/sda5 to "/" and that of /dev/sda5 to "/data". GParted tells me that 1.30 GiB out of 70.12 GiB of /dev/sda5 has been used up. But, the mounted directory "/data" is empty. So, it looks like that my data is there but I cannot access it. Besides, when I set the mount point, I didn't check the "format" box. So, it shouldn't have been formatted. How can I check whether the partition has been formatted? How can I recover my files?

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  • How do I negotiate for colo space?

    - by randy melder
    I guess this isn't a technical question, but it definitely is something IT teams deal with, so here goes: I'm looking at getting a rack at a local colocation facility. I'm weighing the options versus building out in a cloud platform. We are REALLY low bandwidth and power. There's a total of six hosts for the total operation. You can assume we use <= 10 amps of power and <= 2Mbps 95th percentile. Do you have any advice for getting the best deal?

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  • What about IPv4 class E?

    - by Luc
    IPv4's class E network (240.0.0.0/4) contains 268 million addresses. Despite the advertisements for IPv6, claiming we have ran out of address space, this block ironically still claims to be "Reserved for future use". Why hasn't this block been freed up yet? Of course, IPv6 should be promoted instead of freeing up more IPv4 addresses, but we've seen the address shortage coming for years. There has even been a time they weren't sure there was enough time to develop IPv6 before we would run out of addresses. Why didn't they free up this block already? And is there any chance these addresses will be used in the future, like when IPv6 is fairly widely implemented but we still need IPv4 for backwards compatibility? It will be phased out regardless, but then ISPs don't have to employ NAT for IPv4 compatibility.

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  • dynamically allocating space for variable in ksh

    - by Govind Rajan
    I am new to ksh unix shell scripting.I need my ksh script to get inputs from the user. and the number of inputs is unkown. I need to get the inputs and process again further .The sample run could be : Enter the input values : Hello how are you Select two values from the above : how you Here the italized text are the inputs from the user.The inputs number given by the user is unknown .I down know how to handle the values given by user. Thanks in advance

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