Fedora :: Disable Write Cache To Usb Flash Drives?
Aug 27, 2011
I have problem with umounting usb flash drives. When I insert usb flash and copy big files to it ( 400MB ) copy process is quick ( system use cache to store files ). After this when I umount this drive, after 1 minute I got error that this drive cannot be unmounted ( because cache is not stored in drive, umount time limit I think ). How to disable write cache to usb flash drives, change its size or change umount timeout.
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Jul 16, 2010
I'm testing OpenSUSE 11.3 on a server and I'd like to disable the write cache on all of my drives. In Ubuntu Server I was able to accomplish this with hdparm by adding the appropriate settings to /etc/hdparm.conf
As far as I can find the only thing that OpenSUSE offers is /etc/sysconfig/ide which allows you to force particular DMA modes. I could just put the hdparm commands in /etc/init.d/boot.local but I'd prefer to do it the right way if there is a right way to do this in OpenSUSE.
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Feb 8, 2011
How do i disable the linux file cache on a xfs partition (both read an write).
We have a xfs partition over a hardware RAID that stores our RAW HD Video. Most of the shoots are 50-300gb each so the linux cache has a hit-rate of 0.001%.
I have tryed the sync option but it still fills up the cache when copinging the files. ( about 30x over per shoot :P )
/etc/fstab:
/dev/sdb1 /video xfs sync,noatime,nodiratime,logbufs=8 0 1
Im running debian lenny if it helps.
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Dec 19, 2010
How to disable the NTFS drives root password authentication?When I try to access the NTFS drives for the first time after logging in, the system is asking for root password authentication.How can I disable this?
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May 9, 2010
upgraded from karmic through update managerANDnone of of my external drives cd drive or flash drives are picked upad to go back to karmic and will remain there for a whil
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Jun 21, 2010
I recently had issues with the latest version of the Linux Kernels and I got that fixed but ever since that has happened none of my Drives will mount and they aren't even recognized.
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Jul 13, 2010
I have Intel X25-V SSD connected to linux machine and its status is shown as "[sdb] Write cache: enabled, read cache: enabled" in dmesg. I knew we can disable write cache using hdparm. Is there any way to disable read cache and is this read cache present on SSD ?
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Feb 14, 2011
I want to disable processor cache or in other words, want to read write data directly from RAM... Is there any way to make it possible? I am talking about on chip cache memory not any disk cache stuff.
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Sep 24, 2009
I don't understand this error nor do I know how to solve the issue that is causing the error. Anyone care to comment?
Quote:
Error: Caching enabled but no local cache of //var/cache/yum/updates-newkey/filelists.sqlite.bz2 from updates-newkey
I know JohnVV. "Install a supported version of Fedora, like Fedora 11". This is on a box that has all 11 releases of Fedora installed. It's a toy and I like to play around with it.
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Jan 21, 2010
I used to be able to write to my SD memory card but just recently it is being automatically mounted as read-only. I checked the read-only tab and tried to set it to the lock position, and to the unlock position. Neither position makes a difference. It was working normally a few days ago. I also tried changing the permission using su
ls -lt gives the following result
drwxr-xr-x 4 col root 16384 1970-01-01 01:00 CANON_DC
chmod chgrp and chown in su mode don't change anything either.
I tried mounting a different 1GB SD card and it works perfectly. I noticed that when I mount this card I get a window asking me what I want to do, but I don't get this on the other card. It must some kind of setting related to the unwriteable card.
I am using F10 2.6.27.41-170.2.117.fc10.i686
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Nov 16, 2010
60 gigabyte SSDs are down around US$100.
It seems like the optimal use would be as a cache for the regular hard drives in my computer. Eliminating the need for a fast hard drive, so I can just use a slow 2TB (~US$100) drive with a SSD cache.
Is there a good way to do this yet?
It seems like it would be nice to be able to exclude some files from caching, for things like bittorrent.
Reviews of some SSDs: [URL]
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Jun 11, 2011
How I can disable the driver cache or adjust it better?
I have
/ ext 2
everything else ext4 and my storage drive has xfs.
Anytime I need to do a reset, whatever is in the cache is unreadable afterward. I like to avoid this. The best would be not to have a reset, but sometimes it just happens. Can I do that?
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Mar 19, 2010
In my F12 box,whenever I open ..... in firefox, it says either Java is disable OR install latest version of Adobe flash player. I checked in firefox prefrences menu and and there I see already Java / java-script checkbox in checked for enable and along with it I have the latest flash player installed as per the manual install suggested by the missing plugin notifier.
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Jun 18, 2010
I was able to read and write to my USB thumb drives until I mounted a USB thumb drive with an autoinstaller, and every since then all of my flash drives show up with the owner as "root". I've tried changing the owner, and I'm not allowed- even with using sudo chown.
I don't get an error with that, but the owner isn't changed. I can read from the drives but not write to them. (I found that I can copy to the flash drive by using sudo cp, but I want to get away from command line stuff. I have too much to do to be constantly dropping into terminal mode!)I had no problems until the very minute I mounted that flash drive.I've read a few threads, and found other people with symptoms similar to mine, but when I try the fixes suggested, they didn't work.I've also not been able to locate anything that the flash drive autoinstaller changed or put in, but I must admit that I still am a relative newbie to Linux (been around computers since the early 70's, around Windows since 92-93, around OS/2 94-96, and Linux for only a year or so- and haven't learned that much command line stuff yet!).
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May 19, 2009
I just installed firefox and flash-plugin.The version of firefox is 3.0.10, package is firefox-3.0.10-1.el5.centos.The version of flash-plugin is 10.0.22.87, package is flash-plugin-10.0.22.87-1.el5.rf.But firefox crashes when there is flash in web page, unless disable flash plugin in firefox.
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Oct 27, 2010
So I have been doing some RAID 5 performance testing and am getting some bad write performance when configuring the RAID with an even number of drives. I'm running kernel 2.6.30 with software based RAID 5. This seems rather odd and doesn't make much since to me. For RAID 0 my performance consistently increases as I add more drives, but this is not the case for RAID 5. Does anyone know why I might be seeing lower performance when constructing my RAID 5 with 4 or 6 drives rather than 3 or 5?
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Jan 30, 2009
i am using SUSE 11.0 KDE 4.0 i had root account installed in 8.0 Gb drive, and a normal account installed in 4.0 Gb drive .And i was using rest of space for windows (NTFS). Now i want to use a drive (NTFS) to linux for additional requirements. i want get write permissions to that drive .. am i able to get ??r else ..i need to format with EXT3?
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Jan 9, 2011
Update: Solution posted below. Distro: Kubuntu 10.04 AMD 64. My system automatically mounts USB devices when attached to the system. I have explicitly disabled this function in (KDE) System Settings --> Advanced --> Removable devices. It doesn't matter - as soon as a USB device is plugged in the system mounts it as root.
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Dec 22, 2010
How can I Enable/Disable USB port(USB Drives)?
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Apr 20, 2010
I have the same problem with my Ubuntu 9.10. I am using 64-bit computer and 64-bit Ubuntu.When I tried to install Flashplayer I got the message"E:/var/cache/apt/archives/flashplugin-installer_10.0.45.2ubuntu0.9.10.1_amd64.deb: conflicting packages - not installing flashplugin-installer "I tried to un-install all flash-player by "Synaptic Package Manager" and even un-install firefox. Then re-install them back. But still got this problem.I have tried many way I could. But now I am stuck.
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Aug 16, 2010
I just bought a USB hard disk and when I plug it in it gets mounted as owner root and group root. I tried writing a udev rule for it based on the following guide:Nothing seems to work, it always mounts as root. Slackware 13.1, KDE, Dell Optiplex GX280, Western Digital Passport USB 320 gig drive.I am a member of the plugdev group, so it seems to me a rule should not even be necessary.
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May 11, 2010
Is if an existing option for me to disable the copy-on-write features of the MMU? I'm doing this for a project. I do not see this on the config menus (or I did not find the correct place). If it's not an existing option, do anyone know how can I change the kernel so that it can do non-copy-on-write fork?
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May 8, 2010
I have one desktop and two laptops. It is strange to find that none of the three systems play VCD, when I use Totem, Totem-xine, Gxine or VLC media player, even with the codecs updated. Worse, each of the three DVD players then act in a loop, seeking the LG DVD-RAM drive endlessly. But the drives otherwise work very well and I also write DVDs and CDs often.I have tested the VCDs in Windows machines with VLC media player, and the VCDs work wonderfully. This is kind of strange. So I thought may be I should report this.
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Apr 13, 2010
How do I access a flash drive? I am using Ubuntu 9.10. I would think plugging it in would auto detect but that does not happen. I have tried several different flash drives. I stick them into a USB slot and nothing. I went into Places.Computer and Places.Home Folder. It's not showing there either. I tried several different USB ports. It appears Ubuntu can't detect USB flash drives.
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Jun 12, 2010
The problem of slow usb transfer speeds has been half solved in Lucid. I'm getting 25 mbps plus speeds when it comes to transferring data to portable hard drive. But with my Kingston flash drive the speeds are still as low as 2 mbps. Is this because some flash drives are not meant to be compatible with Ubuntu?
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Jul 4, 2010
I'm buying a new memory stick online, but on the page I'm buying it from, it says "OS Required: Microsoft Windows XP, Apple MacOS X 10.1.2, Microsoft Windows Vista / 7" so I'm wondering does this mean it won't work in Linux (Ubuntu)? Because i thought that flash drives were independent of OS.
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Dec 28, 2010
I have 64bit Maverick installed and am using VirtualBox 3.2.12 to run 32bit XP Home. In the devices menu, nearly all the USB devices are grayed out. The printer is the only exception. It is working fine. If I plug in a flash drive (memory stick or whatever one wants to call it), Ubuntu sees it and it appears in the menu but is grayed out. When I remove the device, it disappears from the menu. This tells me that VirtualBox sees them. How do I get to access these USB devices? What have I omitted to do?
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Sep 25, 2010
I have Mandriva 08 with Gnome and Nautilus. My O.S won't open a desktop icon but it does show up in "Computer" and HardDrake. If I go to "Places" "Computer" and open up the "Preferences" there is "Settings" which I will include as an attachment. What is the GUI way to use a Flash drive or a MP3 device on Linux. I would rather not use the terminal if it is not necessary.
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Jul 28, 2010
utility to wake up USB flash drives. I have two that do not get recognised under puppy and xp will see them but not format them Fat16 originally but puppy has used them for save files.
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Feb 9, 2010
how to make removable media (e.g. USB sticks) not have any write caching. I want to prevent data loss when they are removed after file copying appears done but before write caches are written. I'm using Gnome on Squeeze.
I've found suggestions of adding the 'sync' mount option to /system/storage/default_options/vfat/mount_options in the Gnome configuration. However this doesn't seem to completely eliminate write buffering, as the drive activity light continues for several seconds after file copying appears done, and unmounting drives produces a dialog box which says to wait whilst data is written to disk.
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