Questions about disk drives under the UNIX and Linux systems. See also the "filesystems" tag.

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2
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0answers
20 views

how to check default cache mode for disk in kvm

KVM/qemu support various types of cache - none, writethrough, writeback. How to check which one is default and is used on system when no cache= is specified? For RHEL6 i found that it's writethrough ...
1
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1answer
21 views

Disk numbering a drive then mounting in solaris 10

I've a rescued sun v240 (2x 73Gb scsi drives). Trying my best to get onto the Solaris 10 OS. Managed to get via console lead and putty on windows machine . Managed to get cdrom-s single user (used ...
1
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1answer
425 views

Problem creating raw disk image and mounting it in rescue mode to QEMU

I am trying to create booting system from raw disk image. This is what I do: $ dd if=/dev/zero of=system2.img bs=1M count=6000 6000+0 records in 6000+0 records out 6291456000 bytes (6.3 GB) copied, ...
0
votes
1answer
573 views

“Spare” disk in a 2-disk mdadm RAID1 array?

I recently had a RAID1 volume fail. It had three primary partitions in it, all participating in separate, but similarly configured VGs. This configuration comes from the fact that the machine is ...
2
votes
2answers
34 views

How to determine whether the data is written to disk or cached?

I'm learning file operation calls under Linux. The read() and write() and many other functions use cache to increase performance, and I know fsync() can transfer data from cache to disk device. ...
24
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10answers
37k views

List partition labels from the command line

Is there a command that will list all partitions along with their labels? sudo fdisk -l and sudo parted -l don't show labels by default. EDIT: (as per comment below) I'm talking about ext2 labels - ...
0
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0answers
32 views

How do I decrypt this hard drive?

In 2011 I installed Ubuntu server edition on an old Dell that I had laying around. During the install process I was using the gui installer and opted to set disk encryption on the disk drive. During ...
1
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1answer
43 views

Recognizing GPT partition table created with different logical sector size

I have a 3TB drive which I have partitioned using GPT: $ sudo sgdisk -p /dev/sdg Disk /dev/sdg: 5860533168 sectors, 2.7 TiB Logical sector size: 512 bytes Disk identifier (GUID): ...
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3answers
2k views

Using SAR to monitor free disk space data

Is there a way to make sar (from sysstat) collect free disk space data?
0
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0answers
17 views

How to prepare for a possible unreadable disk from bios after swapping disks?

How to prepare for a possible unreadable disk from bios after swapping disks? I want to switch out my old disk with my working linux mint 16 os and plug in a new disk and install linux mint 17. I am ...
7
votes
1answer
214 views

reference whole disk (/dev/sda) using UUID

On my system (Debian), I can see the UUID identifier for all of my disks partitions (i.e. /dev/sda1, dev/sda2, ..) ls /dev/disk/by-uuid/ However, I don't see the UUID identifier for /dev/sda ...
1
vote
1answer
46 views

Very slow file operation

I recently rebuild a machine with Centos 5.8 with a brand new disk. This machine is old and has been running 5.8 for a long period with no issues so the only thing which changed recently is the new ...
1
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0answers
44 views

Flash memory and set to read only , Is it virus?

Becuase some of limitation of MS.Windows, my friends and my family gime their flash memory to solve their problem. Such as format, partitioning in Linux with the cfidsk ,parted, sfidsk(dump and ...
0
votes
0answers
45 views

Syncing an iPod classic with Rhythmbox, but it is read-only

I have an old iPod classic (2006 model, I believe) and I recently built my own computer, thus transitioning away from my old iMac and moving onto my own Fedora 21 desktop. Despite my negative opinion ...
2
votes
0answers
42 views

View syscalls/kernel activity for I/O from a running process

I'd like to be able to view syscalls or kernel activity for a process...I'm not actually sure of the terminology I need here! Specifically I'm looking for the difference between I/O going to local ...
0
votes
0answers
22 views

Separating SAS from SATA drives

I have to list all SAS drives and separately list all SATA drives, I'm working on CentOS6 and tried lots of commands which will give some specific information about bus of disks. Let me show you ...
3
votes
2answers
299 views

Replace both disks in a raid 1 mirror

I have a 3 years old server with two same disks. I'm planning to replace both before they fails. Can I add two more new disks to the raid and (after it has been rebuild) eventually remove the two old ...
4
votes
2answers
423 views

Eject / safely remove vs umount

I'm using Ubuntu 12.04, and when I rigth click on a my flash drive icon (in the Unity right bar) I get two options that have me confused: eject and safely remove. The closer I came to answer was this ...
0
votes
1answer
96 views

In smartctl output, what does LifeTime(hours) mean?

Specifically, in smartctl output, how is LifeTime(hours) calculated? I'm assuming it's one of the following: The difference (in hours) between the time of the test and the manufacture date of the ...
0
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0answers
37 views

Any tool or command can detect flash disk or SSD memory type?

Here I mean "SLC" or "MLC", basically, how many bits per cell for the NAND memory. Is there anything we can get? Thanks.
2
votes
1answer
132 views

how to read any process' /proc/pid/io

I'm trying to monitor disk activity of each process. One way that I found how to do this is to read /proc/pid/io file and compare fields with previous read. That works fine except my monitoring ...
0
votes
0answers
29 views

Why does reading from a symlink to network location cause local disk activity?

I am running RHEL 6.4 and have a symbolic link in my home directory to a large file stored elsewhere on a network. My home directory is a network location as well. I've noticed that when I run a ...
4
votes
1answer
280 views

How to find out which file is affected by a bad sector?

Consider you've been informed about a bad sector like this: [48792.329933] Add. Sense: Unrecovered read error - auto reallocate failed [48792.329936] sd 0:0:0:0: [sda] CDB: [48792.329938] Read(10): ...
0
votes
4answers
731 views

Deleted files from home, deleted them from .local/share/Trash/files, System doesn't report back free space

I am running Crunchbang, a Debian variant with OpenBox WM. I have deleted a large number of files via browsing in thunar file manager and pressing del key. They disappear from view. I then go to ...
1
vote
0answers
45 views

Shared NTFS partition conflict, files written under Debian gone

I have a dual-boot W7-Debian Jessie on my laptop, and a NTFS partition initially left for sharing data between OS and keeping big files. With myself getting used to Linux, rebooting to windows became ...
7
votes
4answers
7k views

Is there a good drive torture test tool?

I have been having odd and rare filesystem corruption lately that I suspect is the fault of my SSD. I am looking for a good drive torture test tool. Something that can write to the whole disk, then ...
1
vote
2answers
6k views

UUID Of A drive that won't show up in /dev/disk/by-uuid or blkid

I have a USB drive that is not receiving a UUID. When I look at the contents of the /dev/disk/by-uuid it doesn't exist there. The dev point that the partition lives in is on /dev/sdb. I am able to ...
1
vote
1answer
33 views

1kb partition: is it a problem, can it be removed?

I have a 1KB partition on my drive, sda4. Here is the output of lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 698.7G 0 disk ├─sda1 8:1 0 500M 0 part /boot ├─sda2 8:2 ...
2
votes
0answers
197 views

How do I get ata-style IDs in /dev/disk/by-id to work for USB disks?

I have USB drive dock that I'm plugging SATA drives into. The way they show up in /dev/disk/by-id seems to be dependent on whether the drive has a partition table (usb if not, ata if yes). This makes ...
1
vote
1answer
53 views

Disk is a bottleneck. Background processes make things worse. How to improve responsiveness?

Often, the bottleneck of my laptop is the disk. When doing some disk-intensive computations, automatically-started background processes like updatedb, find /something etc. kick in, making things even ...
0
votes
1answer
337 views

getting system level error in solaris system

I am getting below errors, what does it means? Oct 19 01:02:25 amra02 scsi: [ID 107833 kern.warning] WARNING: /pci@7c,0/pci10de,377@f/pci1077,142@0/fp@0,0/disk@w5006016841e00513,0 (sd6): Oct 19 ...
5
votes
3answers
415 views

Why is dd not protected against writing on the active disk ?

I use dd a lot. I live in a contant fear of making a mistake one day, for example writing on sda (computer disk) instead of sdb (USB disk) and then erasing everything I have on my computer. I know dd ...
2
votes
2answers
2k views

Can't format external drive

I am trying to format an external drive, but getting the error /dev/sdb1 is apparently in use by the system; will not make a filesystem here! Based on the internet, I have to run cat ...
3
votes
1answer
496 views

libata patch to allow disable sata port

My question is related to the patch introduced in this post How to tell Linux Kernel > 3.0 to completely ignore a failing disk? If the kernel is patched with this code what is the kernel parameter ...
1
vote
0answers
22 views

Granting access permission to normal user to a logical volume of a volume group [duplicate]

When I need to run a program with direct disk access, like read/write from /dev/sdb, I simply add the user to 'disk' group. In this way we don't need to disclose the root account the the user. However ...
1
vote
4answers
925 views

full rootfs on big hardisk, installation or update software not possible

Has anyone seen this issue that can help me solve it? I have got a preinstalled server (Debian GNU/Linux 7.6 (wheezy)), where the disk space was partitioned very badly... :-( The Hardisk is very big ...
6
votes
1answer
102 views

???? files in ls -l output

I see ghost files in red colour inside some of my directories: [drey@cyan|23:54|~/downloads]ls -la ls: cannot access teamviewer9_linux.deb: No such file or directory total 1318096 drwxrwx--- 1 root ...
1
vote
2answers
88 views

Ubuntu 12.04 constantly out of space [duplicate]

I am having this strange problem of my system running out of space constantly. Just yesterday I cleaned up near 15GB of space and today I see it is out of space. I really don't get it. I know some ...
4
votes
1answer
67 views

dd, seek with one block size, write with another block size

Background Info: Copying some .bin files to an SD card (to be read by an embedded device, no filesystem) Commissioning the card requires some segments to be wiped (i.e. zero'd), and others to have ...
1
vote
2answers
260 views

How to acquire image of disk on Linux computer?

Pertaining to computer forensics, if the suspect's computer (which cannot be removed from the scene), is Linux, can you directly use tools such as dd or dcfldd on his computer to acquire the disk ...
0
votes
0answers
140 views

Journal commit I/O error for Seagate Expansion external USB hard drive

I am using Debian 7.6 (amd64) and for some reason when I am trying to read or write to my Seagate Expansion 1TB external USB drive, I am getting input/output errors ... Here is what the output of ...
9
votes
5answers
7k views

Given a kernel ATA exception, how to determine which physical disk is affected?

I woke up this morning to a notification email with some rather disturbing system log entries. Dec 2 04:27:01 yeono kernel: [459438.816058] ata2.00: exception Emask 0x0 SAct 0xf SErr 0x0 action 0x6 ...
1
vote
1answer
530 views

harddisk not recognized / filesystem too large to mount safely on this system / hdparm shows garbage

I have a 4 TB Verbatim external hard disk with ext4. It can be successfully mounted at my Raspberry Pi. I am trying to plug it at my WD Mybook Live Duo device where I have SSH root access. When I ...
0
votes
0answers
76 views

AIX equivalent of Solaris' iostat -E

On Solaris you can use the command iostat -En to view "disk error statistics" as counted by the kernel since the last reboot, where the -n option causes iostat to show "nice" device names. I'm ...
0
votes
0answers
32 views

Calculate Total disk i/o by a single process [duplicate]

I am looking for some tool that will dump total disk I/O by a single process after it ends. So far my finding is :- iotop= It shows i/o per process in real time but does not give total after process ...
0
votes
1answer
365 views

What do these errors mean in sysbench disk test?

I have been running a continuous test of sysbench disk tests on my Linux system that uses compact flash. I am seeing some errors in the output, as shown below. What do these errors mean exactly? Do ...
2
votes
0answers
240 views

The proper way to turn off an external sata encolsure?

I have an e-sata external enclosure with a port expander and 4 sata disks in it that I use for periodic backups. I have what I think is a sound method for powering it off, but not sure if it is the ...
6
votes
2answers
373 views

FreeBSD 10 trace disk activity

Is there any way to find some process which is periodically writing to disk (according to hdd led) on FreeBSD 10 with ZFS (maybe turn ZFS into verbose logging mode)? lsof and other instantly ...
0
votes
1answer
3k views

How to mount the `D:\` disk of Windows in linux mint? [closed]

I am unable to mount the D:\ disk of windows in linux mint. What to do?
1
vote
0answers
65 views

SMART extended offline test validity

Is it possible for the smartctl -t long /dev/sda to complete without error and still the drive fail? How detrimental to the disk's life expectancy is running the test daily/weekly? Thanks!