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• How long do uploaded files stay in the tmp folder in Linux Ubuntu?

  - by Jean-Nicolas Boulay Desjardins

  I am building a web application where my users will be able to upload files. After the files are uploaded I need to send the files to two other servers, and after they will be deleted from the server where they were just uploaded to. I am wandering is it a good I idea to keep the uploaded files in the tmp/ folder the time the uploaded files are sent to the other two servers or should I move them to another folder incase they get deleted? I am also wandering because I would like to know if I have to build a cron script to get rid of the files that have been transfered to the other servers so that I get my disk space back.

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• What are best monitoring tool customizable for cluster / distributed system?

  - by Adil

  I am working on a system having multiple servers. I am interested in monitoring some server specific data like CPU/memory usage, disk/filesystem usage, network traffic, system load etc. and some other my process specific data. What are available open source that can serve my purpose? If it provides to customize the parameter to be monitored and monitor your own data by creating plugin / agent. Any suggestions? I heard of Nagios, Zabbix and Pandora but not sure if they provide such interface.

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• Does ZFS cache Compressed or Uncompressed data in a ZFS file-system with compression turned on?

  - by George Bailey

  ZFS supports file-system compression and it also caches frequently or recently accessed data. If a system has lots of CPU but the underlying data storage system is slow. It is possible that ZFS would perform better with compression turned on. This can be easily tested when writing files by measuring CPU and disk usage and throughput. (of course latency may exist,, but this would not be an issue for large files). But what about cache? If data will have to be decompressed every time it is read then this is probably less of a good idea. Is the cached data compressed?. Does anybody have some information on this?

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• Disable RAID Controller

  - by B.Mr.W.

  I have some decent HP Proliants server that come with "HP Smart Array P410i Controller" enabled, I am using these boxes to set up a Hadoop cluster and I know, RAID is for sure a no-no for Hadoop since the application itself will take care of data redundancy and extra intelligence provided by RAID won't be helpful and might turn down the performance. I tried to disable the devices at the BIOS and the box cannot even access the disk afterwards. So I am assuming the controller is sitting between disks and mother board, and we have to turn it on and configure it to "level0" or something like that. I am wondering what should I do to "disable" the RAID functionality so it will fit into the Hadoop environment.

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• Possible to use DRBD on two ESXi virtualized servers?

  - by chen

  I have two servers (attached disks have been set up as hardware RAID1 for disk device level failure resilience). Here is the setup in my mind: 1) Install ESXi on each of the physical server, M1, M2; 2) Start one VM on each of the ESXi virtualized physical server V1, V2; 3) Install the DRDB drivers within V1 and V2. Essentially, this is a "virtualizing machine running DRBD in the VM's instead of bare metal hardware" idea. My question is whether the above setup can achieve the same "networked RAID1" goal that DRDB can achieve in the bare-metal physical machines (http://www.drbd.org/). Thanks. [EDIT] I found this (http://serverfault.com/questions/49305/drbd-experimentation-and-virtualization) is a similar question, but the answer does not seem to be firmative enough for me to follow.

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• Windows XP , HP , IntelInside Trobelshooting

  - by Jamil Hneini

  My Windows XP PC has stopped booting. On start up, before Windows boots a screen appears saying: Windows Could Not Boot: Could Not Find or Corrupted file <Windows root>\Sytem32\Hal.dll Please Reinstall the file... From that I understand that I have to reinstall the OS but my computer is so old that I have lost the backup and recovery disk. My Computer's Info: 32Bit Computer Pentium 4 Windows XP Service Pack 2 HP History: My Computer has 4 hard drives 2 internal 40 GB drives (C And D) 2 external 8GB drives (E And F) Additional Info: I need the files inside C And E The computer reads my flash drive as a hard drive (8.45GB)(I have never booted while my USB pluged in while I was troubleshooting) With some test I discovered that the C drive wasn't detected by the computer I have already configured the boot order of BiOS I have Set The SATA to IDE The Question: I have a setup for windows 8 32 bit how can I boot from my USB to run that setup? If that isn't the proper way to handle this problem please tell me the proper way.

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• linux/shell: change a file's modify timestamp relatively?

  - by index

  My Canon camera produces files like IMG_1234.JPG and MVI_1234.AVI. It also timestamps those files. Unfortunately during a trip to another timezone several cameras were used, one of which did not have the correct time zone set - meta data mess.. Now I would like to correct this (not EXIF, the file's "modify" timestamp on disk). Proposed algorithm: 1 read file's modify date 2 add delta, i.e. hhmmss (preferred: change timezone) 3 write new timestamp Unless someone knows a tool or a combination of tools that do the trick directly, maybe one could simplify the calculation using epoch time (seconds since ..) and whip up a shell script. Any help appreciated!

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• Raid on ICH9R chip set

  - by user500982

  Hi Im looking at buyign this MB: http://www.supermicro.com/products/motherboard/ATOM/ICH9/X7SPE-HF-D525.cfm Im wondering though if the chipset will support the raid configuration I need. Im looking to configure the following arrays: raid array 1: 2 2TB Disks in Raid 0 raid array 2: 2 2TB Disks in Raid 0 raid array 3 (not actualy an array): 1 300GB Disk not in raid, to be used for OS and boot. So in total there would be 5 drives and the board supports 6. so im good when it comes to connections. However I have herd some chip sets only support one raid array (volume). so either all drives are individual, or are in the array. I must have 2 sperate raid arrays independent of each other, and a 5th drive not in any array. Anybody know if this setup will work? Thanks, -Stewart

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• How to determine non-movable files in Windows 7?

  - by David

  Is there a way to determine which unmovable files are preventing Shrink Volume from releasing the full potential free space? Background: I have a 90 GB partition with Windows 7 on it, and 60 GB free space. I want to shrink it down to about 40 GB, and use the reclaimed 50 GB for a separate data partition. The Shrink Volume tool in Disk Management is only willing to give me 8 GB back. My understanding is that this is because of immovable files. I've followed the instructions found here, which involved disabling hibernation, pagefile, system restore, kernal dump, making sure all related files were deleted, and defrag'ing. I have successfully followed those same instructions before on this same drive, and partitoned the original 150 GB space into 90 GB and 60 GB, but I'm not so lucky this time.

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• One hard drive missing after converting from ide to ahci

  - by user700859

  I have two 500GB SATA HDD in my desktop running XP. After converting from IDE to AHCI, the HDD I use to store data can no longer be accessed from XP. It shows only the first partition as 150GB, and data type is listed as RAW. However, if I boot into a live linux environment or if I pull that HDD out and connect it using USB, I can still get to all my files again. So I completely formatted the HDD into one single partition. But XP still does not recognize it. It still shows the disk as the 150GB partition and data type is still RAW. What's going on and how do I fix this? Thanks in advance.

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• Can't mount home after trying to resize (bad geometry: block count exceeds size of device).

  - by Lynn

  This is on a fresh computer (super computer actually). It got to me with 15T on the home mount and 50G on the root. I tried allocating 7T to root and resizing (since I'm putting a local yum repo on this machine as it has no internet access nor will it ever). I tried following the instructions here: Centos 6.3 disk space allocation but something went wrong and the home won't mount again. Instead I get from dmesg | tail: EXT4-fs (dm-2): bad geometry: block count 4294967295 exceeds size of device (1342177280 blocks) df -h nets this output: Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup-lv_root 7.0T 3.6G 6.6T 1% / tmpfs 190G 216K 190G 1% /dev/shm /dev/sda1 485M 38M 422M 9% /boot I didn't have any files on /dev/mapper/VolGroup-lv_home. Will simply running mke2fs fix it to be mountable? What sort of options should I run it with. I've never resized volumes before or used mke2fs. I don't want to make this mess worse.

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• Dummy SMTP server as a service

  - by levidos

  I have a Windows Server 2008 machine with IIS installed which is hosting a webapp that is sending some notification mails once-in-a-while. What I'd like to do is to monitor the email sent by the application. For this I need a dummy SMTP server which intercepts messages but won't send them further but save them locally on the hard disk. I've already found some of them like Papercut, SMTP4Dev. The problem with these that I have to be logged on the server all the time which is not suitable because the server has only 2+1 TS connections. I like to run a program like these as a windows service and check the mails when I need them.

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• Search Files (Preferably with index) on Windows 2000 Server

  - by ThinkBohemian

  I have many files on a windows server 2000 machine that is setup to act as a networked disk drive, is there anyway I can index the files and make that index available as a search to more people than just me? Bonus if the index can look inside of documents such as readme.txt? If there is no easy way to do this globaly (for all users) Is there a way I could generate and store an index locally on my computer? If this is the wrong place to ask this question, any advice on community more suited?

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• What's the best encoding for videos on the Zune?

  - by Will

  I've got videos I want to encode to put on the zune. Have the encoding software (using Expression Encoder), but I'm not sure about what I should transcode to. I used the settings built into EE for the Zune, but the sync software still shows these videos are being converted before sync. I already have to get these videos into an acceptable format, so encoding twice is a waste of time and space. What I'm looking for is a video codec, audio codec, bitrate, WxH, and anything else I need to encode a video so it goes straight from my disk onto my Zune without re-encoding.

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• Deleted entire harddisk. Now my laptop won't boot anything and stuck at grub rescue

  - by Jahan

  My laptop is Dell Inspiron N4030. I used to use Ubuntu 12.04 and it was on the entire hard drive. I tried to install windows 7 but my laptop couldn't install it. So, I decided to delete the entire hard drive and do a fresh install of Windows 7. But after deletion I immediately removed the gparted live usb which I was using to delete the partitions of my hard drive. And then tried booting from windows 7 cd, didn't work, tried ubuntu live cd, didn't work, tried hiren's boot cd, didn't work, tried super grub disk, didn't work. Probably I'm not doing it right. Help needed badly.

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• VPS hosting for a social network

  - by Jana

  Hi, I've developed a social network and I've been using shared hosting for that since it was launched. With that I wasn't able to send emails in bulk in cases like "newsletters" and "invitations to join my site". Plus most importantly most of the mails I send ended up in user's SPAM list.I'm planning to move into VPS as it may not have limits added. I'm wondering what's the cheapest VPS host available. I'm not pretty much familiar with Linux commands and seeking cPanel to do the work for me. Will the following configuration suit for a "new" social network like mine which has a less load? 1000Mhz Guaranteed 512MB Guaranteed RAM 20GB (RAID) Disk Space 1000GB/month Bandwidth 2 IP(s) & 5 Backups Semi Managed Thanks in advance

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• How do I make the Windows low memory warning less sensitive?

  - by Stephen

  I keep getting this annoying low memory warning/prompt to close games I play. It happens very often and I still have ~6 gigs of ram free. I disabled virtual memory because it was putting stuff on the pagefile when I had 10 gigs free ram so that spiked my disk usage. Is there any way to disable this warning? I have 16GB ram so it shouldn't be an issue. I would prefer to keep pagefiles off because my HD is very loud so it's nice to keep it spun down as much as possible. I don't want to disable it completely. Ideally, I would like it to go off when I have ~2GB left rather than 6, but if this isn't viable, I may just disable it completely.

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• df command show no output

  - by user119720

  I'm running the linux distro on my server.When i want to verify the size of the disk, i'm issuing this commnand to get the output. df -h But it does not produce ANY output.Strangely enough when i'm issuing other command such as fdisk -l or du -h it can show output normally. Does anyone now why is this happening?Thanks. edit: here is the output of cat /etc/fstab none /dev/pts devpts rw 0 0 and this is for mount command none on /dev/pts type devpts (rw) none on /proc/sys/fs/binfmt_misc tpe binfmt_misc (rw) edit(2): here is the output of cat /proc/mounts /dev/vzfs / vzfs rw,relatime,usrquota,grpquota 0 0 proc /proc proc rw,relatime 0 0 sysfs /sys sysfs rw,relatime 0 0 none /dev/tmpfs rw,relatime 0 0 none /dev/pts devpts rw,relatime 0 0 none /proc/sys/fs/binfmt_misc binfmt_msc rw,relatime 0 0

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• Text template or tool for documentation of computer configurations

  - by mjustin

  I regularly write and update technical documentation which will be used to set up a new virtual machine, or to have a lookup for system dependencies in networks with around 20-50 (server-side) computers. At the moment I use OpenOffice Writer with text tables, and create one document per intranet domain. To improve this documentation, I would like to collect some examples to identify areas where my documents can be improved, regarding general structure and content, to make it easy to read and use not only for me but also for technical staff, helpdesk etc. Are there simple text templates (for example for OpenOffice Writer) or tools (maybe database-driven) for structured documentation of a computer configuration? Such a template / tool should provide required and optional configuration sections, like 'operating system', 'installed services', 'mapped network drives', 'scheduled tasks', 'remote servers', 'logon user account', 'firewall settings', 'hard disk size' ... It is not so much low-level hardware docs but more infrastructure / integration information in these documents (no BIOS settings, MAC addresses).

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• NTFS write speed really slow (<15MB/s)

  - by Zulakis

  I got a new Seagate 4TB harddrive formatted with ntfs using parted /dev/sda > mklabel gpt > mkpart pri 1 -1 mkfs.ntfs /dev/sda1 When copying files or testing writespeed with dd, the max writespeed I can get is about 12MB/s. The harddrive should be capable of atleast 100MB/s. top shows high cpu usage for the mount.ntfs process. The system has a AMD dualcore. This is the output of parted /dev/sda unit s print: Model: ATA ST4000DM000-1F21 (scsi) Disk /dev/sda: 7814037168s Sector size (logical/physical): 512B/4096B Partition Table: gpt Number Start End Size File system Name Flags 1 2048s 7814035455s 7814033408s pri The used kernel is 3.5.0-23-generic. The ntfs-3g versions I tried are ntfs-3g 2012.1.15AR.1 (ubuntu 12.04 default) and the newest version ntfs-3g 2013.1.13AR.2. When formatted with ext4 I get good write speeds with about 140MB/s. How can I fix the writespeed?

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• misaligned raid partition in Ubuntu 10.04

  - by Linux Jedi

  I attached two identical hard drives to my linux machine. Then using gparted I formated the first 1024 mb at the beginning of each drive as linux swap space. Then I went into system-administration-disk utility. In there I went to file-create-RAID array. I selected the remaining space in each of the two identical hard drives and created a striped raid array. After the array was created, a warning message appeared. It said "The partition is misaligned by 522240 bytes. This may result in very poor performance. Repartitioning is suggested." What do I do now? As far as I can tell, the partitions are identical.

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• Proper way to connect SATA and IDE Hard drives together?

  - by Bartek

  I have an old IDE hard drive that has a broken Windows install on it. It just won't boot up, and I've tried a variety of solutions. That's fine, I really just need a few files on the hard drive. I have a computer that uses a SATA connected hard drive. It's a working PC. I would like to connect the old IDE hard drive to that compute and basically browse through the file system, grab the files, and copy them to my existing computer. My problem is with my few attempts to connect the IDE drive I would get Boot Disk Failures and so forth. I guess it's trying to boot from the IDE but I'm not really sure. Any help would be appreciated, Thanks!

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• Taking an image backup of an entire server?

  - by WarDoGG

  I am currently using a dedicated server for my hosting needs. However, the costs are too high and I would like to suspend everything until I work out my business strategy again. Is there a way I can take a complete backup of the filesystem and run it in VMWare ? I cannot just copy the entire filesystem because there are lots of tools installed and tight changes to the server configuration files I myself dont know about (by the developers), but I need a snapshot of the entire disk image along with processes installed and everything is as is because for development needs, I need to work on this copy in VMWare or VirtualBox etc. Is it possible for me to take a full image copy ? How do I do it ?

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• Why has my Mac been running fsck_hfs for two days now?

  - by Nate

  I first noticed that fsck_hfs was running, taking up 50-75% of a CPU, yesterday. It continues to run today. ps shows that it is doing /sbin/fsck_hfs -f -n -x -E /dev/disk3. Only problem: I don’t think I have a /dev/disk3. Why is it running? Will it ever finish? Can I kill it? What is /dev/disk3? Could it be my Time Machine volume, which is not mounted at the moment? System Info: MacBook Pro (2008). It has two disks installed—the internal disk (/dev/disk1) and a PC Card SSD (/dev/disk0, surprisingly). It connects to a remote Time Machine volume attached to an Airport Extreme base station.

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• How to efficiently dump a huge MySQL innodb database?

  - by Jagbir

  I got an Ubuntu 10.04 production MySQL database server where total size of database is 260 GB while size of root partition is itself 300 GB where DB is stored, essentially means around 96% of / is full and there's no space left for storing dump/backup etc. No other disk is attached to server as of now. My task is to migrate this database to other server sitting in different datacenter. Question is how to do that efficiently with minimum downtime? I'm thinking in line of: Request to attach an extra drive to server and take a dump in that drive. Transfer dump to new server, restore it and make new server slave of existing one to keep data in sync When migration is needed, break replication, update slave config to accept read/write requests and make old server read-only so it won't entertain any write requests and tell app developers to update there config with new IP address for db. What's your suggestions to improve this or any alternate better approach for this task?

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