Hardware :: How To Read Logical Block From User Space
Feb 18, 2010I have a list of Logical Block Addresses that I need to read from the disk. Is there any way to do this from user space?
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General :: Division Of Logical Memory Space In To User Space And Kernel Space
Jan 4, 2010Logical Memory Space of 4GB is divided in to 3GB User Space and 1GB Kernel Space. Always. Correct?
1. How can we change it? (just changing value of PAGE_OFFSET is okay?)
2. If system have only 256MB of memory (embedded system) and suppose Kernel Modules eat away all the memory during boot. User space will be left will no memory. Is this case possible?
Hardware :: Buffer I/O Error Device Hdc Logical Block 15
Jul 4, 2011I am trying to debug the issue of a desktop that has for the last two weeks started having kernel panics at boot time. This machine has been running flawlessly for the last 8 years, and has had three OS upgrades. I am using memtest to try to understand the issue. The following is part of the memtest output: Reading all physical volumes Buffer I/O error device hdc logical block 0 Buffer I/O error device hdc logical block 15
Illegal node for this track or incompatible media (asc=0x64 ascq=0x00) The failed "Read 10" packet command was /dev/hdc: read failed after 0 of 4096 at 0 Input/output error and similar set of mesaages After this udev checks correctly, and hardware, storage and audio are initialized However sometime in the middle of the boot process, a kernel panic occurs with message Kernel panic -- not symcing : Fatal exception in interrupt
Fedora :: Kernel: Buffer I/O Error On Device Dm-0, Logical Block 124
Nov 28, 2009I have 2 hdds, with encrypted / and /home. Besides there are four other (encrypted ext4) partitions I use rarely. In Fedora 11 at boottime I gave the luks passphrase for / and home and the system booted as intended.
Whenever I needed those extra encrypted partitions I mounted them in Nautilus. Now, in Fedora 12 at boottime dracut tries to open all the encrypted partitions, / and /home are mounted fine, but opening all the other partitions gave the following messages in messages.log:
Quote:
dracut: luksOpen /dev/sdb6 luks-02a0e706-a26f-4019-a2a0-88a0366a994d
kernel: Buffer I/O error on device dm-0, logical block 124
kernel: device-mapper: ioctl: unable to remove open device temporary-cryptsetup-304
kernel: Buffer I/O error on device dm-0, logical block 124
kernel: Buffer I/O error on device dm-0, logical block 124
[code]....
...and these messages are repeated with the other partiitions, and the boot time takes very, very long. How can I tell dracut to ignore those extra encrypted partitions at boottime?
Ubuntu :: Buffer I/o Error On Device Loop0 Logical Block?
Jan 13, 2011i have a inspiron 1520 laptop which is starting to slow down some so i thought linux would help because all i do is internet use, so i download it from another computer and mount it to a usb flash drive like the site says, (netbook remix latest version) then i put it in my laptop and it loads all the way and i press try and after about 10 minutes of loading it lets me try. so that was ok really slow but i thought id install it to hard drive to see if it improved speed. so the next time i start my laptop i get Buffer i/o error on device loop0 logical block xxxxxx so i redo the usbflashdrive no errors switch usb ports and same thing, ive done the switch usb ports and redo the flash drive about 4 times im really getting mad at linux before i even have it installed.
View 1 Replies View RelatedCentOS 5 Hardware :: Buffer I/O Error On Device Sda, Logical Block 0?
May 20, 2009I had installed the CENT OS 5.3 it is installed when i rebooted it gives me error continuously.
Buffer I/O Error on device sda, Logical Block 0
ata4.00 : exception Emask 0x0 SAct 0x0 action 0x0 frozen ......
ata4.00 : status: { DRDY }
why it has giving the error.i have Intel based hardware Core II Duo with 1 GB ram check with sata hard drive 120 GB.
CentOS 5 :: Buffer I / O Error On Device HDD - Logical Block 176935
Sep 4, 2009I just downloaded an iso of the latest CentOS dist (5.3) and burned it to disk. I booted from the CD and received the following error:
Memory for crash kernel (0x0 to 0x0) not within permissible range
Illegal mode for this track or incompatible medium -- (asc=0x64, ascq-0x00)
The failed "read 10" packet command was:
Buffer I/O error on device hdd, logical block 176935
(This error message repeats for another 9 or 10 times then it says the following)
Red Hat nash version 5.1.19.6 starting
Setting up new root fs
(Then there are some unmounts which are old /dev, /proc, /sys. At this point a series of steps begin).
Setting Clock
Starting udev
Loading default keymap (us)
Setting hostname local host.localdomain
Setting up logical volume management
Checking file systems
These are just some of the steps that appear after the above error is displayed, all of the steps that load have an ok status. After those are completed I get to a text prompt - localhost login: At this point my keyboard does not seem to respond, pressing enter or any of the other keys seems to have no effect. I noticed that during the load process I could toggle the light for caps and num lock, but at the login screen it does'nt work. So at this point I'm not sure if I'm having a technical issue or if its just another case of an user error.
Fedora Installation :: F10 Live CD Buffer I/O Error On Device Sr0 Logical Block?
Jan 29, 2009Create symlink /dev/root and then exit this to continue the boot sequence.
Buffer I/O error on device sr0, logical block *******
sr 4:0:0:0 [sr0] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE,SUGGEST_OK
sr 4:0:0:0 [sr0] Sense Key : Medium Error [current]
sr 4:0:0:0 [sr0] ASC=0x10 <<vendor>> ASCQ=0x90
end_request: I/O error, dev sr0, sector 1395920
Clocksource tsc unstable (delta = -499902943 ns)
loops that during install. new hard drive fresh out of box. WD 320GB 7200 Toshiba Qosmio intell core duo i've installed with this same disk before previous hard drive died. installed over windows vista. this time im trying to install solo no windows disk to reinstall with, F10 only. I've tried other distros as well, Mandriva one 2009, Dreamlinux, and this one. i've suspected hard drive controller went out but i can format and partition the drive. also the cd/dvd drive is bad but im booting from cd fine. tried removing the cd drive and booting from an external usb cd rom, same errors.
im about to deploy and need my computer up and running ASAP. 7 months no entertainment is not good. when i use a linux boot disk from Ultimate Boot Disk (UBD) i get an error of - hda status no response and something about invalid heads dreamlinux pushes past the error till i get the error about cant start x server. about my graphics
Ubuntu Installation :: [35.877869] Buffer I/O Error On Device Fd0, Logical Block 0
Nov 10, 2010I created a start up USB and I try to install it on a computer I have, however, everytime I try I get the following error repeated...
[35.877830] end_request: I/O error, dev fd0, sector 0
[35.877869] Buffer I/O error on device fd0, logical block 0
emulate the USB using the force FDD option. I tried emulating a hard drive instead but then it doesn't boot up into ubuntu.
Fedora :: Root Logical Volume Ran Out Of Space?
Nov 13, 2009 My computer: (Lenovo T61 Thinkpad, running fc11 for about 2 and half months). Apparently I when I made my partitions I didn't leave quite enough room in my root directory, because I just completely ran out. Here is how my hard drive is partitioned:
1 physical volume group (sda)
4 logical volumes (home, root, swap, var)
The root had about 15 gigs on it, which just filled up. When I restarted to see if that would help, when it rebooted it went fine up to the log-in screen. Instead of the usual fedora blue background, it was black except for the log-in window, which looked very low-res. A little pop-up kept coming up saying the GNOME power configuration settings failed to load or something. When I logged in, the whole screen was black except for the mouse, and I could get no response. I have plenty of space left in home, so I rebooted to rescue mode using the first fedora installation disk, and tried the following command:
Code:
lvreduce -L90G /dev/mapper/DRIVE
which only returned:
Code:
lvreduce: relocation error: lvreduce: symbol dm_tree_node_size_changed, version Base not defined in file libdevmapper.so.1.02
So I couldn't reduce the size of home, and thus couldn't increase the size of root.
IN SUMMARY:
a) the lack of memory in root the probable cause for my computer not working
b) there a good way to reduce home and increase root while running this live disk
Note: When I am looking at it now in the logical volume manager, it says that on the whole physical volume there is only 400MB free. However, when I last looked (about 30 mins before I started having problems) it said there were about 100 Gb free.
Edit: Nevermind. I did some more research and it turned out to be more of a gnome power manager thing rather than a memory space thing, although I'm certainly going to increase my root memory now.
Server :: Identifying What Is Using Up Space In Logical Volume?
Jun 14, 2010I just read and learned about logical volume management today. I have a server running RHEL5.4, LVM2. I have 1 physical volume, with one volume group, and 3 logical volumes. I have no free extents, nor do I have any in my volume group (not sure if it's possible to have free in one and not the other anyway), and I am running out of space on one of my logical volumes. Doing a df -h shows 96% of 9.7GB used on /dev/mapper/MainVG-root, mounted at /. So here's the stupid question: how can I find out what directories/files are taking up what space within this logical volume? As I said I have 3 all together, and the other 2 are mapped to /var and a /var pgsql sub-directory. I figured I could get the sizes of the other directories under / and drill down accordingly, but I seem to be missing some basic rule because the commands I am using and the values I am getting don't add up.
For example, it seemed logical to me to do an ls -lsh on / to try and identify the largest directories. Each directory is listed as being ~4-8K in size. That doesn't make sense to me. So I decided to do a du -sh on each directory. Having done this on all of the / sub-directories and added up those values, there is not enough reported usage here to equal 8.9GB of used space (as df -h / reports).how they would find out how the 9.7GB here is being allocated? Preferably without scripts as I am not ready to add a layer of complexity to this yet without understanding some fundamentals.
Fedora Installation :: Livecd Cant Burn Correctly / Buffer I/O Error On Device Sr0 Logical Block 352328?
Oct 3, 2009i've just burned a livecd (fedora 11), but it doesn't work correctly.it says after i hit boot:
BUFFER I/O error on device sr0 logical block 352328
and then something else, which is similar so i didn't write it down.i read on bugzilla, that is should try to append the boot command with pci=nomsi, but it doesn't work for me
Ubuntu :: Possible After OS Is Installed To Configure Space As One Logical Volume?
Jun 2, 2010HPDL385 with dual raid controllers (8 disks each). During the install of the ISO, it sees the raid controllers individually. I tried "One Generic Drive" but it still only partitions one of the raid controllers.Is it possible after the OS is installed to configure the space as one logical volume?
View 3 Replies View RelatedCentOS 5 :: Df Not Showing Disk Space After Logical Volume Expansion / Fix It?
Jun 5, 2009I've added a new LUN to my Centos 5.2 server using Powerpath and have added it to an ext3 logical volume. I extended the logical volume using lvextend and the new space shows up correctly in lvdisplay. What I'm having problems with is getting Centos to see the new disk space (df -h shows 500GB, not 600GB as expected). I've tried running a resize2fs on the new volume but it tells me that "the filesystem is already n blocks long. Nothing to do". Does any one know where I'm going wrong? If possible I'd like to sort this without a reboot.
View 3 Replies View RelatedGeneral :: External Hard Drive Is No Longer Recognized - Buffer I/O Error On Device Sdb1, Logical Block 6160408
Feb 28, 2010The external hard drive which contains all my photos and where I backed-up all my important documents is no longer recognized. It is a three month old 500GB Iomage Prestige Desktop Hard Drive.When I plug it in, it is recognised as a USB device, because it shows up when I type lsusb, but dmesg gives this error message.
[19712.013250] usb 2-2: new high speed USB device using ehci_hcd and address 21
[19712.145347] usb 2-2: configuration #1 chosen from 1 choice
[19712.147214] scsi25 : SCSI emulation for USB Mass Storage devices
[code]....
I popped the disk out of the casing put it on a SATA connect internally and then tried the file recovery programs testdisk/photorec and SpinRite, but both failed because they couldn't recognize the external hard disk.
Hardware :: Mem - 'input Output Error On Sr0 Logical Block (a Large Number) After A Long Time The Booting Proceeds To A Point
Aug 29, 2010I have been having a lot of trouble lately with installing from CD/DVD. The DVD reader/writer on this laptop is new. Nevertheless, trying to install Ubuntu onto an exernal HD, I get 'input output error on sr0 logical block (a large number) After a long time the booting proceeds to a point, but I never get the actual installation started, and have to shut down manually.
The CD is fine, says the Ubuntu-checker. I just installed using my sons laptop, and there was no trouble. Question: does this indicate a motherboard failure? A memory block damaged? Do you know of a diagnostic tool I can use to check the reading of a CD/DVD?
General :: Read The Contents Of A Physical Disk That Was Part Of A Larger Logical Volume?
Mar 17, 2010how easy it would be to read the contents of a physical disk that was part of a larger logical volume. The disk contains a "Linux LVM" partition that spans its entire size. My problem is that one of my disks died, and I have to send it back for a warranty replacement. However, the disk is dead, and I can't zero it out. I'm just trying to assess how difficult it would be (or at least how likely it would be) for a tech that's checking out the disk to get at the data.
View 4 Replies View RelatedProgramming :: Passing Data Between Kernel Space To User Space In Asynchronous Way
Dec 13, 2010I am developing a I2C CDROM client driver. The CDROM firmware supports TOC information read through a I2C command. It sends the TOC information in burst ( Interrupts a GPIO pin when it is ready ) and my CPU does a I2C read to read the TOC. When the CDROM firmware finishes sending the last data burst , it informs my CPU that it is done with the TOC, by a flag in the last data burst. I would like to know, which is the most efficinet way I can send these TOC information to userspace?
View 4 Replies View RelatedGeneral :: Calling User Space Callback Function From Kernel Space?
Sep 22, 2009I am writing device driver in which i have to call callback function from kernel space, which are saving my data. But the callback functions are in userspace. While accessing them i am getting segmentation fault.
View 1 Replies View RelatedProgramming :: Function In Kernel Space Called Form User Space
Jul 7, 2009I wanna write a file in kernel space but from my searching I can to know that instead of writeing file in kernel space ,I can write data to user space by copy_to_user space.
But link is missing ...I dont know how will my user space will access kernel space means my function in kernel space which will do copy_to_user /....How my user space function will call my kernel level function ..
Can any one of you provide me with some example file which are doing this .I know every char driver is using it ...but i could not trace back how user level function is accessing it ...i m confused between user space and kernel space.
Kernel :: Buffer I/O Error Logical Block "2.6.31.6"
Nov 20, 2009I compiled a new kernel for slackware 13 yesterday and all is going well, except for the fact that during boot I get errors regarding a second hard drive. They are of the form
PHP Code:
[code]....
I wasn't getting this error with the previous 2.6.29.6 kernel. As far as I can tell everything is working fine, but the errors make me nervous as this is where all my data is stored. The partition was previously formatted ntfs-3g and I thought maybe I'd done something with ntfs support while configuring the kernel so I backed up the data, reformatted to ext4 which matches all other linux partitions except for swap of course, and I get the exact same errors.
1. Is there something different in this kernel in reporting errors or maybe something I set in configuration?
2. recommend a good (simple and ubiquitous) cli program to check the disk for errors so that I can run it in both the old and new slack kernels as well as mandriva on the same machine?
Programming :: Call Socket Prog Code Written In User Space From Kernel Space?
Jul 14, 2009How to use execv from kernel space to call a user space program writtenfor socket prog.
I tried to write code for socket in kernel but its not working.
Socket code in kernel is also needed.
General :: Virtual Space Seen By Each New Process In User Space?
Jun 21, 2010In a 32-bit system, max memory addressable is 4GB. Now Linux kernel does memory mapping division of 1GB for kernel address space and 3GB for user address space. That means 4GB of virtual address space is divided between kernel (1GB) and user (3GB).
Q1. All virtual mapping utilizes the available physical RAM without any division? I mean to say that if RAM is 512MB then a page in kernel space can lie any where RAM (leave aside old PCI dma accesses)? (How this fits to fact that kernel memory is non-pageble)
Q2. If a process is created in user space, it has visibility 4GB address space or 3GB address space?
Programming :: Signal From Kernel Space To User Space?
Jul 21, 2011I have the following requirement in my module. The driver gets some data from the external device. After getting 1MB of data it has to send it to the user space application. What is the best thing to implement for this in driver.? Is it ok to implement like, after getting data, the driver will send a signal to the user space application. Then the user space application sends an ioctl to read the data. Is there any alternate, that the driver directly sends the data without the user space application asks for it.?
View 4 Replies View RelatedServer :: How To Block Animated GIFs From Taking Up Space
Nov 29, 2010My company recently started bouncing all .Gifs back to our linux server. Is there a way on my end that i can block this from happening so it stops taking up space?
View 3 Replies View RelatedUbuntu :: Access User Account 1 Home Directory From User 2 Work Space?
Jun 16, 2011Do you think there is a way of accessing different user data from another account which I have set up.
Ie. user 1 = account has messed up
user 2 = account works fine
access user account 1 home directory from user 2 work space?
Hardware :: Ext2_get_inode: Unable To Read Inode Block
Jul 21, 2011[code]...
server2 kernel: EXT2-fs error (device sdc1): ext2_get_inode: unable to read inode block - inode=44998281, block=89981174
[code]...
Server :: Mount - Block Device Giving Read Only
Mar 15, 2011I want to keet some data on windows dir. I have tried the below command and giving the below error.
[root@xyz0044 ~]# mount -t cifs //10.48.64.52/jata -o username=domainv.kumar3,password=xxxx /mnt/backup
mount: block device //10.48.64.52/jata is write-protected, mounting read-only
mount: cannot mount block device //10.48.64.52/jata read-only
Fedora Hardware :: F12 Boot Fails - Short Block Read
Jun 11, 2010My F12 installation, which was installed on an HP tx2500z laptop and has been operating relatively well since January, now fails to boot after a frozen screen precipitated a forced shutdown. On reboot, I was dropped into a shell with the error message "Error reading block 1546 (Attempt to read block from file system resulted in a short read) while getting next inode from scan." recommending to run fsck manually. During the fsck run, after a substantial number of Pass 1 inode count corrections, the "Error reading block" message reappeared, with the question "Ignore error<y>" to which I answered "y".
fsck responded with "Force rewrite<y>". Since I did not know what would be written here, I said "no". I then forced shutdown, rebooted into Windows, and searched for further guidance. One suggestion was to run fsck -y on the affected partition. My laptop drive has four partitions, the first two being allocated to Windows and an HP supplied repair partition. sda3 is a tiny boot partition (100 MB), and sda4/5 is the LVM remainder.
fsck -y /dev/sda3 told me the boot partition was fine.
fsck -y /dev/sda4 stopped immediately and asked "Could this be a zero-length file partition?". Given the ext3 structure, I suppose the correct answer is yes.
fsck -y /dev/sda5 told me fsck.LVM2_Member: not found.
Following this, I then attempted again to reboot, and ran fsck without options. Once again, during Pass 1, Block 1546 exhibited the short read error, again asking about a rewrite - which I once again answered no. Pass 1 completed with another substantial number of inode count corrections, and Pass 2 started - immediately generating the message:
'passwd' in /etc/pam.d (65556) has deleted/unused node 7831. Clear<y>
After some hesitancy, I said "yes", and of course a second similar message appeared. I was brave enough to answer "yes" six more times, with the first two referring to /etc/pam.d inodes, and the next four referring to /etc/security/console.apps inodes. The eighth message, also similar, referred to inodes elsewhere - but by now I did not dare to continue and forced shutdown. Is this repairable, and if so, how?
General :: EXT3 FS Error - Unable To Read Inode Block
Feb 8, 2011I am using Wind River Linux- 2.6.27.18-WR3.0bg_standard. The problem is whenever I execute "reboot, ls, cd" and many other commands the OS prompts me an error-
"end request: i/o error, dev sda, sector "(different sector each time)" and
EXT3-fs error (device sda1):ext3_get_inode_loc:unable to read inode block- inode-4088001, block-4097027
I also executed "dmesg", it also showed similar errors. Has the disk gone bad or the kernel is corrupted?