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  • gpfs: adding a new nsd server to a cluster

    - by alessandra
    I have a gpfs cluster composed by 10 linux nodes, managed by a primary server A, which also act as nsd server for a first stack of disks. I attached a new jbod to one of the nodes (call it node B), which I would like to become a nsd server for this new stack of disks, but still be included in the cluster so that the disks are available to all the nodes. Node B is connected to the cluster via ethernet. How can I make the new nsd seen by all the nodes of the cluster? I can create the new nsd but when trying to create the filesystem on node B it the command mmcrfs times out. It looks like the nodes of the cluster cannot understand the filesystem location even if I specify them attached to server B in the description file. Would it be better to remove node B from the cluster, create a cluster on its own with its attached filesystem and connect it remotely with the previous cluster? Or a clustered NFS solution would apply better? Can you please give me any suggestion?

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  • Variable size encrypted container

    - by Cray
    Is there an application similar to TrueCrypt, but the one that can make variable size containers opposed to fixed-size or only-growing-to-certain-amount containers which can be made by TrueCrypt? I want this container to be able to be mounted to a drive/folder, and the size of the outer container not be much different from the total size of all the files that I put into the mounted folder, while still providing strong encryption. If to put it in other words, I want a program like truecrypt, which not only automatically grows the container if I put in new files, but also decreases it's size if some files are deleted. I know there are some issues of course, and it would not work 100% as truecrypt, because it basically works on the sector level of the disk, giving all the filesystem-control to the OS, and so when I remove a file, it might as well be left there, or there might be some fragmentation issues that would stop just truncating the volume from working, but perhaps a program can be built in some other way? Instead of providing sector-level interface, it would provide filesystem-level interface? A filesystem inside a file which would support shrinking when files are deleted?

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  • Mac OS X 10.6.3: how does Apache config work?

    - by w-
    Just got a MacBook Pro 15" so I'm unfamiliar with how the filesystem is laid out. I noticed when in my filesystem that I've got a few paths specifying httpd.conf: /etc/apache2/httpd.conf /opt/local/apache2/conf/httpd.conf /private/etc/apache2/httpd.conf The config files are different in lots of ways (user, group, server_root, modules that are loaded, etc.) The apache2 folders themselves also greatly differ. It seems that the one getting used is either /etc/apache2/httpd.conf or /private/etc/apache2/httpd.conf I'm wondering if I might have messed up my system after installing some packages (php5, django, etc) via macports and maybe ended up with 2 apache2 instances. My questions are hence: which httpd.conf is the one being used ? what are the other files for? thanks --update-- To clarify, I didn't explicitly install apache2 via macports. I'm wondering if it was installed because it was a dependency. After more hunting around I'm learning I never should've installed php to begin with because Snow Leopard already includes php 5.3 from the get go. http://serverfault.com/questions/82410/apache-2-and-php-5-3-via-macports I'll need to open another question that asks about how the Mac filesystem works. Thanks all for replies.

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  • How to stop RAID5 array while it is shown to be busy?

    - by RCola
    I have a raid5 array and need to stop it, but while trying to stop it getting error. # cat /proc/mdstat Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md0 : active raid5 sde1[3](F) sdc1[4](F) sdf1[2] sdd1[1] 2120320 blocks level 5, 32k chunk, algorithm 2 [3/2] [_UU] unused devices: <none> # mdadm --stop mdadm: metadata format 00.90 unknown, ignored. mdadm: metadata format 00.90 unknown, ignored. mdadm: No devices given. # mdadm --stop /dev/md0 mdadm: metadata format 00.90 unknown, ignored. mdadm: metadata format 00.90 unknown, ignored. mdadm: fail to stop array /dev/md0: Device or resource busy and # lsof | grep md0 md0_raid5 965 root cwd DIR 8,1 4096 2 / md0_raid5 965 root rtd DIR 8,1 4096 2 / md0_raid5 965 root txt unknown /proc/965/exe # cat /proc/mdstat Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md0 : active raid5 sde1[3](F) sdc1[4](F) sdf1[2] sdd1[1] 2120320 blocks level 5, 32k chunk, algorithm 2 [3/2] [_UU] # grep md0 /proc/mdstat md0 : active raid5 sde1[3](F) sdc1[4](F) sdf1[2] sdd1[1] # grep md0 /proc/partitions 9 0 2120320 md0 While booting, md1 is mounted ok but md0 failed for some unknown reason # dmesg | grep md[0-9] [ 4.399658] raid5: allocated 3179kB for md1 [ 4.400432] raid5: raid level 5 set md1 active with 3 out of 3 devices, algorithm 2 [ 4.400678] md1: detected capacity change from 0 to 2121793536 [ 4.403135] md1: unknown partition table [ 38.937932] Filesystem "md1": Disabling barriers, trial barrier write failed [ 38.941969] XFS mounting filesystem md1 [ 41.058808] Ending clean XFS mount for filesystem: md1 [ 46.325684] raid5: allocated 3179kB for md0 [ 46.327103] raid5: raid level 5 set md0 active with 2 out of 3 devices, algorithm 2 [ 46.330620] md0: detected capacity change from 0 to 2171207680 [ 46.335598] md0: unknown partition table [ 46.410195] md: recovery of RAID array md0 [ 117.970104] md: md0: recovery done. # cat /proc/mdstat Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md0 : active raid5 sde1[0] sdf1[2] sdd1[1] 2120320 blocks level 5, 32k chunk, algorithm 2 [3/3] [UUU] md1 : active raid5 sdc2[0] sdf2[2] sde2[3](S) sdd2[1] 2072064 blocks level 5, 128k chunk, algorithm 2 [3/3] [UUU]

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  • copy large LVM volume(14TB) from one server to another

    - by bruce
    recently,I have to copy a very large LVM volume()rom server A to server B. Below is the filesystem of server A and server B - server A [root@AVDVD-Filer ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/vg_avdvdfiler-lv_root 16T 14T 1.5T 91% / tmpfs 3.0G 0 3.0G 0% /dev/shm /dev/cciss/c0d0p1 194M 23M 162M 13% /boot /dev/mapper/vg_avdvdfiler-test 2.3T 201M 2.1T 1% /test /dev/sr0 3.3G 3.3G 0 100% /mnt server B [root@localhost ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup-LogVol00 20G 2.5G 16G 14% / tmpfs 3.0G 0 3.0G 0% /dev/shm /dev/cciss/c0d0p1 194M 23M 162M 13% /boot /dev/mapper/VolGroup00-LogVol00 16T 133M 15T 1% /xiangao/lv1 /dev/mapper/VolGroup00-LogVol01 4.7T 190M 4.5T 1% /xiangao/lv2 I want to copy LVM volume /dev/mapper/vg_avdvdfiler-lv_root on server A to LVM volume /dev/mapper/VolGroup00-LogVol00 on server B . The server A and server B is in the same IP segment. IN the LVM volume on server A , there is all average 500M avi wmv mp4 etc. I tried mount /dev/mapper/vg_avdvdfiler-lv_root on server A to server B through NFS , then use cp command copy. It is clear I faild . Because the LVM volume is too big , I do not have good idea . I hope a good solution here. I'm a chinese, my english is very pool. sorry thanks everyone!

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  • Using UDF on a USB flash drive

    - by CesarB
    After failing to copy a file bigger than 4G to my 8G USB flash drive, I formatted it as ext3. While this is working fine for me so far, it will cause problems if I want to use it to copy files to someone which does not use Linux. I am thinking of formatting it as UDF instead, which I hope would allow it to be read (and possibly even written) on the three most popular operating systems (Windows, MacOS, and Linux), without having to install any extra drivers. However, from what I found on the web already, there seem to be several small gotchas related to which parameters are used to create the filesystem, which can reduce the compability (but most of the pages I found are about optical media, not USB flash drives). I would like to know: Which utility should I use to create the filesystem? (So far I have found mkudffs and genisoimage, and mkudffs seems the best option.) Which parameters should I use with the chosen utility for maximum compability? How compatible with the most common versions of these three operating systems UDF actually is? Is using UDF actually the best idea? Is there another filesystem which would have better compatibility, with no problematic restrictions like the FAT32 4G file size limit, and without having to install special drivers in every single computer which touches it?

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  • Using UDF on a USB flash drive

    - by CesarB
    After failing to copy a file bigger than 4G to my 8G USB flash drive, I formatted it as ext3. While this is working fine for me so far, it will cause problems if I want to use it to copy files to someone which does not use Linux. I am thinking of formatting it as UDF instead, which I hope would allow it to be read (and possibly even written) on the three most popular operating systems (Windows, MacOS, and Linux), without having to install any extra drivers. However, from what I found on the web already, there seem to be several small gotchas related to which parameters are used to create the filesystem, which can reduce the compability (but most of the pages I found are about optical media, not USB flash drives). I would like to know: Which utility should I use to create the filesystem? (So far I have found mkudffs and genisoimage, and mkudffs seems the best option.) Which parameters should I use with the chosen utility for maximum compability? How compatible with the most common versions of these three operating systems UDF actually is? Is using UDF actually the best idea? Is there another filesystem which would have better compatibility, with no problematic restrictions like the FAT32 4G file size limit, and without having to install special drivers in every single computer which touches it?

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  • Best practices for thin-provisioning Linux servers (on VMware)

    - by nbr
    I have a setup of about 20 Linux machines, each with about 30-150 gigabytes of customer data. Probably the size of data will grow significantly faster on some machines than others. These are virtual machines on a VMware vSphere cluster. The disk images are stored on a SAN system. I'm trying to find a solution that would use disk space sparingly, while still allowing for easy growing of individual machines. In theory, I would just create big disks for each machine and use thin provisioning. Each disk would grow as needed. However, it seems that a 500 GB ext3 filesystem with only 50 GB of data and quite a low number of writes still easily grows the disk image to eg. 250 GB over time. Or maybe I'm doing something wrong here? (I was surprised how little I found on the subject with Google. BTW, there's even no thin-provisioning tag on serverfault.com.) Currently I'm planning to create big, thin-provisioned disks - but with a small LVM volume on them. For example: a 100 GB volume on a 500 GB disk. That way I could more easily grow the LVM volume and the filesystem size as needed, even online. Now for the actual question: Are there better ways to do this? (that is, to grow data size as needed without downtime.) Possible solutions include: Using a thin-provisioning friendly filesystem that tries to occupy the same spots over and over again, thus not growing the image size. Finding an easy method of reclaiming free space on the partition (re-thinning?) Something else? A bonus question: If I go with my current plan, would you recommend creating partitions on the disks (pvcreate /dev/sdX1 vs pvcreate /dev/sdX)? I think it's against conventions to use raw disks without partitions, but it would make it a bit easier to grow the disks, if that is ever needed. This is all just a matter of taste, right?

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  • copy large LVM volume(14TB) from one server to another

    - by bruce
    recently,I have to copy a very large LVM volume()rom server A to server B. Below is the filesystem of server A and server B - server A [root@AVDVD-Filer ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/vg_avdvdfiler-lv_root 16T 14T 1.5T 91% / tmpfs 3.0G 0 3.0G 0% /dev/shm /dev/cciss/c0d0p1 194M 23M 162M 13% /boot /dev/mapper/vg_avdvdfiler-test 2.3T 201M 2.1T 1% /test /dev/sr0 3.3G 3.3G 0 100% /mnt server B [root@localhost ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup-LogVol00 20G 2.5G 16G 14% / tmpfs 3.0G 0 3.0G 0% /dev/shm /dev/cciss/c0d0p1 194M 23M 162M 13% /boot /dev/mapper/VolGroup00-LogVol00 16T 133M 15T 1% /xiangao/lv1 /dev/mapper/VolGroup00-LogVol01 4.7T 190M 4.5T 1% /xiangao/lv2 I want to copy LVM volume /dev/mapper/vg_avdvdfiler-lv_root on server A to LVM volume /dev/mapper/VolGroup00-LogVol00 on server B . The server A and server B is in the same IP segment. IN the LVM volume on server A , there is all average 500M avi wmv mp4 etc. I tried mount /dev/mapper/vg_avdvdfiler-lv_root on server A to server B through NFS , then use cp command copy. It is clear I faild . Because the LVM volume is too big , I do not have good idea . I hope a good solution here. I'm a chinese, my english is very pool. sorry thanks everyone!

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  • Flash drive suddenly died. Why? Can I recover it?

    - by mg
    Hi, I have a flash drive that I used not too much but, after few month of inactivity, it died. I know that flash drives have a limited write cycles but I am sure that this is not the problem. I tried to create a new partition table and format the drive nothing worked. This is the output of mkfs.ext2. marco@pinguina:~$ sudo LANG=en.UTF-8 mkfs.ext2 -v -c /dev/sdc1 [sudo] password for marco: mke2fs 1.41.11 (14-Mar-2010) fs_types for mke2fs.conf resolution: 'ext2', 'default' Calling BLKDISCARD from 0 to 4001431552 failed. Filesystem label= OS type: Linux Block size=4096 (log=2) Fragment size=4096 (log=2) Stride=0 blocks, Stripe width=0 blocks 244320 inodes, 976912 blocks 48845 blocks (5.00%) reserved for the super user First data block=0 Maximum filesystem blocks=1002438656 30 block groups 32768 blocks per group, 32768 fragments per group 8144 inodes per group Superblock backups stored on blocks: 32768, 98304, 163840, 229376, 294912, 819200, 884736 Running command: badblocks -b 4096 -X -s /dev/sdc1 976911 badblocks: Input/output error during ext2fs_sync_device Checking for bad blocks (read-only test): done Block 0 in primary superblock/group descriptor area bad. Blocks 0 through 2 must be good in order to build a filesystem. Aborting.... Is there something I can do to recover it?

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  • Join multiple filesystems (on multiple computers) into one big volume

    - by jm666
    Scenario: Have 10 computers, each have 12x2TB HDDs (currently) in raidZ2 (10+2) configuration, so, in the each computer i have one approx. 20TB volume. Now, need those 10 separate computers (separate raid groups) join into one big volume. What is the recommended solution? I'm thinking about the FCoE (10GB ethernet). So, buying into each computer FCoE (10GB ethernet card) and - what need more on the hardware side? (probably another computer, FCoE switch? like Cisco Nexus?) The main question is: what need to install and configure on each computer? Currently they have freebsd/raidz2, but it is possible change it into Linux/Solaris if needed. Any helpful resource what talking about how to build a big volumes from smaller raid-groups (on the software side) is very welcomed. So, what OS, what filesystem, what software - etc. In short: want get one approx. 200TB storage (in one filesystem) from already existing computers/storage. Don't need fast writes, but need good performance on reading data. (as a big fileserver), what will works transparently, so when storing data don't want care about onto what computer the data goes. (e.g. not 10 mountpoints - but one big logical filesystem). Thanks.

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  • Ubuntu 12.04 partioning an external drive without lossing data

    - by Menelaos Perdikeas
    I have an Ubuntu 12.04 with an external 1.5T disk (just for data). It is /dev/sdc1 seen below: $ df -T Filesystem Type 1K-blocks Used Available Use% Mounted on /dev/sda1 ext4 1451144932 27722584 1350794536 3% / udev devtmpfs 6199460 4 6199456 1% /dev tmpfs tmpfs 2482692 988 2481704 1% /run none tmpfs 5120 0 5120 0% /run/lock none tmpfs 6206724 284 6206440 1% /run/shm /dev/sdc1 fuseblk 1465135100 172507664 1292627436 12% /media/Elements The thing is I would like to implement this rsync-based backup strategy and I want to use my /dev/sdc1 external drive for that. Since the guide mentioned above recommends placing the backup directory in a separate partition I want to repartition the /dev/sdc1 external hard disk but retain existing data in a separate partition. E.g. split /dev/sdc1 into two partitions: (i) one to be used exclusively for the rsync-based backup and (ii) the other for the existing miscellaneous data. How should I go about partitioning with minimal risk to my existing data and what kind of filesystem do you recommend? I would prefer a console-based guide but unfortunately all the material I found on the web is oriented towards partitioning the main (bootable) disk and not an external fuseblk filesystem used only for passive data.

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  • Can't mount hard drive. Ubuntu 12.04

    - by Sam
    I am trying to recover some pictures on my 320 GB Hard Disk, so I put in a Live Ubuntu CD and am in that right now. In the devices list, it shows my USB drive, but not my 320 GB Hard Disk. I can see the disk in Disk Utility (it says it's on /dev/sda), but it's not mounted, and it says it has a few bad sectors but it is OK. In Disk Usage Analyzer, it says my maximum capacity is 13.4 GB, so it's definitely not using the 320 GB Hard Disk. I tried the following: sudo mkdir /media/newhd (worked) sudo mount /dev/sda /media/newhd (didn't work. it says I must specify the filesystem type) I then tried: fsck.ext4 -f /dev/sda (didn't work. Said: Superblock invalid, trying to backup blocks. then: Bad magic number in super-block while trying to open /dev/sda. The superblock could not be read or does not describe a correct ext2 filesystem. If the device is valid and it contains an ext2 filesystem (and not swap or ufs or something else), then the superblock is corrupt, and you might try running e2fsck with an alternate superblock) Does anyone have any ideas? The whole problem started when my Windows Vista said "Can't find operating system". Any ideas on how I can get on to my hard drive at /dev/sda?

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  • NFS on top of GFS2 - does it work?

    - by Matthew
    We're currently using a NoSQL derivative called Splunk to receive our data. The software supports something called "search head pooling" in which the job-dispatching engine is housed on several servers which share a common storage point. Originally our intention was to use a clustered filesystem like GFS2 because of low latency, stability, and ease of setup. We set up GFS2, and it's working with no issues. However when trying to run the software, it's trying to create lock files, and a bunch of other things that their support team can't quite explain. Ultimate feedback from them was that they only support NFS. Our network administration team heavily frowns on NFS (lack of stability, file lock issues, etc). So, I was thinking about the possibility of setting up NFS on each server in the cluster to act as a wedge layer between the GFS2 filesystem and the software. Basically configure each server to export the GFS2 filesystem's mountpoint via NFS, and then tell each server to connect to that NFS share. That way we aren't introducing any single-points-of-failure should a dedicated NFS server go down, but the vendor gets their "required" NFS share. I'm just brainstorming ways around, so please tear this apart :)

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  • What are the typical methods used to scale up/out email storage servers?

    - by nareshov
    Hi, What I've tried: I have two email storage architectures. Old and new. Old: courier-imapds on several (18+) 1TB-storage servers. If one of them show signs of running out of disk space, we migrate a few email accounts to another server. the servers don't have replicas. no backups either. New: dovecot2 on a single huge server with 16TB (SATA) storage and a few SSDs we store fresh mails on the SSDs and run a doveadm purge to move mails older than a day to the SATA disks there is an identical server which has a max-15min-old rsync backup from the primary server higher-ups/management wanted to pack in as much storage as possible per server in order to minimise the cost of SSDs per server the rsync'ing is done because GlusterFS wasn't replicating well under that high small/random-IO. scaling out was expected to be done with provisioning another pair of such huge servers on facing disk-crunch issues like in the old architecture, manual moving of email accounts would be done. Concerns/doubts: I'm not convinced with the synchronously-replicated filesystem idea works well for heavy random/small-IO. GlusterFS isn't working for us yet, I'm not sure if there's another filesystem out there for this use case. The idea was to keep identical pairs and use DNS round-robin for email delivery and IMAP/POP3 access. And if one the servers went down for whatever reasons (planned/unplanned), we'd move the IP to the other server in the pair. In filesystems like Lustre, I get the advantage of a single namespace whereby I do not have to worry about manually migrating accounts around and updating MAILHOME paths and other metadata/data. Questions: What are the typical methods used to scale up/out with the traditional software (courier-imapd / dovecot)? Do traditional software that store on a locally mounted filesystem pose a roadblock to scale out with minimal "problems"? Does one have to re-write (parts of) these to work with an object-storage of some sort - such as OpenStack object storage?

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  • Input/output error reading USB backup drive on CentOS 6.4

    - by Kev
    I'm suddenly seeing some strange behaviour on our USB backup drive that doesn't make sense to me: (2013-10-21 14:58:23 [root@newdc /]$ cd /mnt/backup/ (2013-10-21 14:59:03 [root@newdc backup]$ ls -la ls: reading directory .: Input/output error total 0 (2013-10-21 14:59:05 [root@newdc backup]$ df -h /mnt/backup Filesystem Size Used Avail Use% Mounted on /dev/sda1 917G 843G 28G 97% /mnt/backup How is it possible for the OS to know how much is in use, but I can't ls any of it as root? Or more to the point, what problem does this indicate? /var/log/messages said this: Oct 21 14:57:54 g5 kernel: EXT4-fs error (device sda1): ext4_journal_start_sb: Detected aborted journal Oct 21 14:57:54 g5 kernel: EXT4-fs (sda1): Remounting filesystem read-only But...read-only is something different than 'throw an io error'... After unmounting to try fsck on it, I had someone on-site look at it, and the drive was not spun up, and had a slow-flashing light, which I believe means it was in a power-suspend mode. So I had them unplug and replug the USB cable, and now (before remounting) it says: fsck from util-linux-ng 2.17.2 e2fsck 1.41.12 (17-May-2010) /dev/sda1: clean, 2805106/61046784 files, 181934167/244182016 blocks I then mount it and now ls works and df reports: Filesystem Size Used Avail Use% Mounted on /dev/sda1 917G 680G 191G 79% /mnt/backup What would cause it to go into such a state without being asked to? Why all the weird behaviour, and now it appears to not be corrupt?

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  • USB Diskdrive cannot be formatted nor accessed

    - by Dmolish
    So I have just recently bought and 8GB USB stick(Kingston DT 100 G2) on which I had installed Linux. However I needed to reinstall said Linux so I formatted the stick to "default" settings which includes FAT32 filesystem. Later when the install process kept getting errors, I got advice that the problem might be with the FAT filesystem. I decided to try and format the stick to NTSF (format G:/fs:ntsf) but the formatting failed and the drive broke down. And with breaking down I mean you cannot access the drive anymore and when you plug it in Windows asks if I want to format the drive but despite my will the format always fails. To fix this I tried changing it back to FAT32 (format G:/fs:fat32), but i get "Error in IOCTL-call". Second thing I tried was trying to reset the filesystem with some 3rd party application like HP USB Disk Storage Format Tool. But the programs didn´t regocnize any media on the drive. So now I´m in the situation that I haven´t got any idea on what to do next. Is the drive recoverable or did I just create a piece of waste metal.

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  • How to copy a large LVM volume (14TB) from one server to another?

    - by bruce
    I have to copy a very large LVM volume from server A to server B. Below is the filesystem of server A and server B Server A [root@AVDVD-Filer ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/vg_avdvdfiler-lv_root 16T 14T 1.5T 91% / tmpfs 3.0G 0 3.0G 0% /dev/shm /dev/cciss/c0d0p1 194M 23M 162M 13% /boot /dev/mapper/vg_avdvdfiler-test 2.3T 201M 2.1T 1% /test /dev/sr0 3.3G 3.3G 0 100% /mnt server B [root@localhost ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup-LogVol00 20G 2.5G 16G 14% / tmpfs 3.0G 0 3.0G 0% /dev/shm /dev/cciss/c0d0p1 194M 23M 162M 13% /boot /dev/mapper/VolGroup00-LogVol00 16T 133M 15T 1% /xiangao/lv1 /dev/mapper/VolGroup00-LogVol01 4.7T 190M 4.5T 1% /xiangao/lv2 I want to copy the LVM volume /dev/mapper/vg_avdvdfiler-lv_root on server A to LVM volume /dev/mapper/VolGroup00-LogVol00 on server B. Server A and server B are in the same IP segment. In the LVM volume on server A, there is all average 500M avi wmv mp4 etc. I tried mounting /dev/mapper/vg_avdvdfiler-lv_root on server A to server B through NFS, then use cp to copy. It is clear I failed. Because the LVM volume is too big, I do not have good idea why. I hope a good solution here.

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  • Copy past speed very slow for a large number of files on Windows [closed]

    - by Arno2501
    I've run the following test I've created a folder containing 15'000 files of 400 bytes using this batch : @ECHO off SET times=15000 FOR /L %%i IN (1,1,%times%) DO ( fsutil file createnew filename%%i.txt 400 ) then I copy past it on my Windows Computer using this command : robocopy LargeNumberOfFiles\ LargeNumberOfFiles2\ After it has completed I can see that the transfer rate was 915810 Bytes/sec this is less than 1 MB/s. It took me several seconds to copy 7 MBytes Please note that this is very slow. I've tried the same with a folder with a single file of 50 Mbytes and the transfer rate is 1219512195 Bytes/sec. (yeah GB/s) instantaneous. Why copying large number of files take so much time - ressources on a windows filesystem ? Please note that I've tried to do the same on a linux system which runs on the same computer in a virtual machine (vmware player) with ext3 filesystem. I use the cp command and the copy is instantaneous ! Please also note the following : no antivirus I've tested that behaviour on multiple windows computers (always ntfs) i always get comparable results (transfer rate under 1MB/s avg 7-8 seconds to copy 7 MBytes) I've tested on multiple linux ext3 system the copy is always instantaneous for that amount (15000 files of 400 bytes) The question is about understanding what makes windows filesystem so slow to copy large number of files compared to a linux one for instance.

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  • AMFPHP Database Sessions

    - by Rick
    I am using AMFPHP w/ a Flex application and am needing to start storing the user sessions in the database instead of the filesystem. I've tried utilizing the session save handler function but no matter what I do it still ends up storing the files on the filesystem. Any ideas?

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  • programmatically updating iTunes track location

    - by Ben Clifford
    I would like to modify the filesystem path for tracks on itunes programmatically, so that I can apply a string transformation to some of the tracks locations (which are now stored in a different places on the filesystem). I've tried using AppleScript to update the location property of the relevant tracks but I get an end-of-file error when calling "set mytrack's location to ..." I've seen various other hacks online that involve exporting the entire track db, modifying it in XML, and then reimporting it - but that seems to lose too much metadata (such as playlists).

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  • Is it possible to turn a string with base64 encoded image data into a displayable image in flash lit

    - by ezicus
    I have tried using a data URI to load the image data into a movie clip, but flash lite does not appear to support the data URI scheme. I also thought it might be possible to base64 decode the image data and write it out to a file and load the file back into the movie clip using the file URI scheme. However, I do not see a way to write to the filesystem in the documentation. Am I missing something in the flash lite docs that would allow me to write to the filesystem?

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  • Implemenation of a pass through file system

    - by user3491505
    Can anyone give me inputs on how to implement a pass through filesystem using fuse?? What I mean by this is that you mount your FUSE file system somewhere (say in /mnt) such that the FUSE file system passes all filesystem calls to some other place (say /home/user). For example, when you go into the /mnt directory and run "ls", this would pass the file system calls to execute ls through and run them on /home/user, such that the directory contents of /home/userwould be listed

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