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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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.
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.
View 1 Replies View RelatedI 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.
View 5 Replies View RelatedHow 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?
I have a wanderfulley working Kubuntu Karmic 9.10 box and love it. now I just did another install of 9.10 on a old box that dosent have eney network card. the old thing is runing prity well but I want it set up like this one that I'm on now SO I thought I'd try aptoncd the trouble is that I have done apt-get clean a few times sence seting this box up so wat's left in /var/cache/apt/archives is a varey incomplete set of packages. I'm trying to find a way to reload the /var/cache/apt/archives with all insaled packages.
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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.
I'm trying to install Kubuntu on an old Windows system. I am getting tons of errors such as:
I/O error
SQUASHFS error:unable to read page, block XXXXXX
SQUASHFS error: unable to read fragment cache block
It then reports that it's loading ACPI modules and starting the ACPI services, starting the system log daemon, doing Wacom setup, starting kernel log daemon.....and then it reads sb_bread failed reading block umptysquat.I have a feeling that this hard drive is toast. I can't get it to install Windoze or Linux. I can't even get a prompt so I can do a low-level format. Unfortunately, I'm not super savvy with Linux and don't know what to do next.
I tried to follow "Configuring GRUB 2" at /etc/default/grub (file) in the instruction at
But the file is read only? How do I make it so that it can be modifiedie GRUB_DEFAULT=0 to GRUB_DEFAULT=1
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.
I was laughing about klackenfus's post with the ancient RH install, and then work has me dig up an old server that has been out of use for some time. It has some proprietary binaries installed that intentionally tries to hide files to prevent copying (and we are no longer paying for support or have install binaries), so a clean install is not preferable.
Basically it has been out of commission for so long, that the apt-get upgrade DL is larger than the /var partition (apt caches to /var/cache/apt/archives).
I can upgrade the bigger packages manually until I get under the threshold, but then I learn nothing new. So I'm curious if I can redirect the cache of apt to a specified folder either on the command line or via a config setting?
I installed squid cache on my ubuntu server 10.10 and it is work fine but i want to know how to make it cache all files like .exe .mp3 .avi ....etc. and the other thing i want to know is how to make my client take the files from the cache in the full speed. since am using mikrotik system to use pppoe for clients and i match it with my ubuntu squid
View 1 Replies View RelatedI am reading slab allocator, it defines slab cache, i am quite confuse is it same as hardware cache?
View 2 Replies View Relatedi was looking for a way to stop my menus taking a few seconds to load my icons when i first open them and found a few guides suggesting using the gtk-upate-icon-cache command, but with the any colour you like icon theme i'm using (stored in my home folder .icons directory) i kept getting a "gtk-update-icon-cache: The generated cache was invalid." fault i used the inbuilt facility in the acyl script to copy the icons to the usr/share/icons directory and tried the command again, this time using sudo gtk-update-icon-cache --force --ignore-theme-index /usr/share/icons/ACYL_Icon_Theme_0.8.1/ but i still get the same error. i tried with several of the custom icon themes i've installed and only 1 of the first 7 or 8 i tried successfully created the cache.
View 4 Replies View RelatedI have Ubuntu 10.04 with Gnome. Whenever I put in a blank CD/DVD an icon on the desktop appears named "Blank CD/DVD" and a window appears asking me what I want to do with it. How do I disable the window and the icon from the desktop?
View 2 Replies View RelatedUbuntu main O/S windows 7 running in Virtualbox how or can i read a usb flash drive in the windows O/S i want to read my mp3 player
View 4 Replies View RelatedI want my samba to keep my windows attributes exactly what the user setted in windows I mean if it has read only file in win box and copy it to samba share ,samba keep it read only and same for other attributes but it does not do it now with my configuration:Quote:
[global]
workgroup = DOMAIN
server string = File Server
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The titles says about everything. CD's are perfectly automounted.WhenI insert a DVD however (I tried various DVDs), absolutely nothing happens, as if I would have inserted nothing or a blank DVD.I already read lots of threads and nothing o help... Here are the outputs of a few commands that might or might not be useful.A line I added myself in fstab which appears completely useless:
Code:
/dev/sr0 /media/dvd auto utf8,user,noauto,exec 0 0
Code:
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What are the possible problem when Windows access the file from Ubuntu got Read Only even though have a full permission to read, write and execute the file? Ubuntu to Ubuntu accessing the file there is no problem only Windows got a problem.
View 1 Replies View RelatedMy comp is litterly doing nothing, and 61% of my RAM is being used as cache. I don't know if I created a swap space correctly. I loaded up gparted and I see that I do have a 2gb partition labled linux-swap. Why am I completely out of RAM? I have 4gb btw
View 9 Replies View RelatedI am using Fedora 11 64-bit. The problem is, when I start to install any updates or new packages, the system return the following error:No package cache is available.The package list needs to be rebuilt.This should have been done by the backend automatically.
Cannot retrieve repository metadata (repomd.xml) for repository: fedora. Please verify its path and try again.I am completely new to linux, meaning I have never, ever, used a linux based system. I have recently accustomed to myself with only the basic commands (ls, yum, help, g++ etc.)
I have a small older HP OB6000 laptop with F14 on it and only 10GB of disk.
I've been weeding out a lot of packages I don't need on it to carve more user disk space.
One of the biggest disk consumers is /var/cache/yum. My problem is that even after a yum clean all it still consumes over 450MB.code...
I've been troubled by the high amount of RAM that is used by my Ubuntu desktop. Before I installed Ubuntu 10.04 (desktop, 64-bit) my system used around 500MB of RAM when no applications were open (just cold boot into the GNOME under 9.10). But when I installed Lucid, I've noticed that my used memory is now reported as 1GB or more as soon as I log into the system.
I want to figure out what is using all the extra RAM but I can't seems to find the culprit. I looked at all of the processes and numbers just don't add up. I exported the list of processes into a file and summed up the memory used by every process in a spreadsheet. The total came to around 700MB. Yet, both System Monitor and "free" reported the time that system was using over 1GB of memory. This means that at least 300MB of RAM are used but not by any process, at least as reported by "ps".
I was wondering if there is a way to know which files are in the linux page cache. I've searched but the only thing I've found is meminfo.Is there anything out there that can give more details regarding what is being cached?
View 2 Replies View RelatedI believe Ubuntu 10.10 has a DNS cache, how can I disable this?
View 1 Replies View Relatedwhen i type arp -n it shows nothingif i type arp -vit showsskipped :0 found :0I want to look at my ip and mac addresses in arp cacheif i change my ethernet ip address it is not reflected or stored in the cache.
View 4 Replies View RelatedI found that one of my computers was issuing a DNS request to a domain on my local network every time I send a query. I've look around and saw several programs you could install for DNS local cache, but does it not come with some application by default? If it matters, I'm running Ubuntu 11.04 with DHCPD and Bind9.Also, I did add nameserver 127.0.0.1 to /etc/resolv.conf, and it's listed before my other nameservers.
View 5 Replies View RelatedSlackware64 13.0 I have a website that has been migrated to a new server. After a few days I'm still pointing at the old server and the hosting company have recommended that I flush my dns cache. A quick google for this in linux seemed to recommend restarting the nscd daemon but nscd -g tells me it's not running anyway. I connect to Virginmedia via wired ethernet to a Belkin N1 router so is there a way I can do this I wonder, either via Virginmedia or Slackware?
View 2 Replies View RelatedI use two ramdisks one mounted in /tmp the other mounted as /ramdisk /tmp is used as a temp store for apps which need temp space /ramdisk is used to store copies of read only databases for processing. Files in here can be 10-500Mb in size.
I suspect that the O/S may be caching the files stored in /tmp and /ramdisk and thus is not efficient. How can I check if the O/S is caching ramdisk files and if this is the case how can I prevent it? Is there an option to say 'dont cache /tmp' ?
I have a home storage of many drives which are seldom accessed, and extremely seldom written to. So, I made several RAID1 arrays with "write-mostly" drives in each one, so that all the drives spin down after a while, and if they are accessed, only one drive in each array has to spin up. This way, I hope to minimize the risk of losing anything due to mechanical shock or wear.
But it was not so easy. First, the write-mostly drives did spin up on every read request due to a bug in the kernel, so I managed to get the fix accepted into the newer kernels (which is my largest contribution to the Linux development so far. See [URL] .....) Now, if I read directly from the array, it works as expected (only the first drive spins up); but if I create a filesystem there (ext4) and read from it, the second drive still spins up anyway. (Does ext4 write something when it reads a file?.. I have it mounted with relatime, so AFAIK it shouldn't...)
Well, I thought, I'll just mount the filesystems read-only and remount them if I need to modify the data there, which is not very often, to say the least. Also, this way the drives don't have to spin up every system shutdown to unmount the filesystems; during a power outage, it used to take a lot of time for them to spin up one by one just to unmount, while my UPS had to survive long enough for them to finish. That's one more problem solved.
But I decided to improve even further. Sometimes I just want to see the contents of those arrays without even accessing some files (for example, when I accidentally click the wrong network drive button in Windows, or when I just want to see if I have something there or not). If I read the directory trees during startup and keep them cached, then those drives won't even have to spin up at those moments! The question is, is there a way to do it? I remember Linus boasting about our kernel being the best at caching the filesystem trees, and I know there is vmtouch [URL] .... which allows us to keep some files cached, but what about the directory tree itself?.. If I simply "find" all the files there, it seems to work, but they get evicted from cache sooner or later...
