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

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How do I interpret GNOME Disks' benchmark results?

Having ordered a new USB drive for my parents, I decided to use the Benchmark option in GNOME Disks. The results were interesting: A third run with a sample size (odd phrasing!) of 100 MB gave ...
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1answer
11 views

Are there any caveats when restoring a backup to a larger disk than the original disk with Clonezilla?

I have a Clonezilla image of a 250 GB disk. Are there any caveats or downsides if I would restore this to a 500 GB disk? (I will of course not be able to use more than the 250 GB on the new disk, but ...
0
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1answer
103 views

How can I zero the unused blocks on my filesystem in order to minimize the compressed disk image size? [duplicate]

If I dd my disk and compress the image with lzma or lzo the image is still big. The partition is 10GB used, 90GB available. But the image still around 20GB. I believe that is because I have copied ...
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3answers
69 views

How to check disks at startup (alternative to chkdsk c: /f on Windows)

How to check my 2 disks at startup (they're in BIOS RAID1)? I am on Mint 17.2. computer user # blkid /dev/sda1: UUID="6042-870C" TYPE="vfat" /dev/sda2: UUID="2ef42e6f-4987-46e5-aca9-872fd70a9f9e" ...
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2answers
173 views

Debian Linux root disk getting full, need to transfer /var folder to another disk

One of the disks got out of space, however other disk is nearly empty. Need suggestions how to transfer biggest folder(/var) to the other disk and mount at /var. For now /var folder was in / ...
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0answers
21 views

corrupted sd card [closed]

I found out that my micro sdhc card (Kingston 32 GB micro sdhc class 10) stopped working properly. The SD card should have 32 GB but it reports 2TB. The issue seams to be in messed up number of ...
2
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0answers
99 views

LVM partition not mounting

There was a drive failure on a disk in a RAID1 configuration. I removed the bad disk and reconfigured the RAID1 to only use the good disk. When I reboot the machine there are missing LVM partitions. ...
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0answers
54 views

sysv and unknown partition table?

We have disk about 1985, It has a Unix.But we didn't know type of Unix.I did the following step : dd if=/dev/sdc of./all_of_disk.iso #sdc is the given disk Then : hexdump -C all_of_disk.iso > ...
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2answers
137 views

How to get disk name that contains a specific partition

If I know that a partition is for example /dev/sda1 how can I get the disk name (/dev/sda in this case) that contains the partition ? The output should be only a path to disk (like /dev/sda). It ...
3
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1answer
5k views

How to get total Read and write IOPS in linux

How do i get Read and write IOPS separately in Linux? using command line or in a programmatic way. i am installed sysstat package. Please tel me how do i calculate separately using sysstat package ...
2
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0answers
271 views

Disk I/O latency using /proc/vmstat file

How do I calculate disk read and write latency in Linux? Is it possible to do the calculation using /proc file system? I am using iostat and vmstat command. But I do not understand how the ...
2
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1answer
43 views

Wipe a Solaris Disk

Looking for something similar to Eraser for Solaris 9-10-11 Anything?
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1answer
40 views

Broken disk size after incomplete dd operation

Once I was writing an ISO image into my USB disk using dd, I mistakenly pulled it out, and now it has only 10 MB of size. The correct size is 32 GB. Note that this smaller size is for the whole USB ...
2
votes
1answer
82 views

EXT filesystem family: Why does the first superblock start at offset 1024?

I was brushing up and diving deeper into filesystem anatomy and in numerous resources it is said to be a requirement that the very first superblock start at an offset of 1024 bytes. I started looking ...
1
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0answers
32 views

Specific question about “/mnt”: /mnt is not showing the disk space [duplicate]

The disk space showing from "df -h" and "du -sch ./*" seems different for "/mnt". Can somebody help me in finding the probable reason? =============================== #df -h Filesystem ...
0
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1answer
215 views

How do I pass options to forcefsck?

I am trying to run a one time disk check at bootup by using /forcefsck but I would like to pass some of the FSCK options such as y, c, f, and v. I have tried inserting these in the file but I seems to ...
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2answers
67 views

The Deny the permission of mounting any drives to a user

I'm using Linux Mint 17.2 Cinnamon. There are multiple partitions on /dev/sda. /dev/sda1 is where the system resides, /dev/sda2, ..., /dev/sdaX are NTFS partitions. There are two users admin and ...
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2answers
553 views

Parallel vs Distributed vs Traditional File system

I am trying to understand the differences between these three file system at a very basic level. Distributed FS: HDFS Parallel FS : Lustre Traditional FS : ext4/ext3/ NTFS/FAT etc. I want to ...
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1answer
31 views

Official resources about disc management on linux / distributions [closed]

My question is about official linux and common distributions (e.g. fedora/debian) on learning disk management in practice on linux / linux distributions. The layout, may be including the file system, ...
1
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1answer
79 views

Deleted boot partition accidentally with gpart

I just typed gpart delete -i 1 ada0 when I was supposed to write gpart delete -i 1 ada1 and unfortunately typed reboot before I noticed my mistake. The disk ada0 had the default GPT layout that ...
4
votes
2answers
190 views

how can I sync a specific device? [duplicate]

Is there a way to sync a specific device in Linux? This would be used to ensure that, e.g., writes to a USB thumb drive have taken place without waiting for queued writes from a video processing job ...
2
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2answers
339 views

How to construct a GPT-only partition table on Linux?

All of the tools I've tried until now were only capable to create a dual (GPT & MBR) partition table, where the first 4 of the GPT partitions were mirrored to a compatible MBR partition. This is ...
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0answers
58 views

CloneZilla, does exist a simpler method?

While browsing the web for backing up my disk, I often see CloneZilla in the results. As a beginner with Linux, the process seems tricky to me (Live USB, etc). Note: I plan to back up my whole disk ...
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0answers
56 views

How do I identify which disk(s) make up a vxfs disk group?

In case it matters, system in question is Solaris installed on SPARC. System contains two HDDs, same make/model/capacity. On one HDD are the root and var partitions/slices. /etc/mnttab shows me that ...
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0answers
69 views

List partition type GUID's for all disks from command line?

I need to list the partition type GUID's from the command line. Note: This is not the same as the partition UUID. Basically I'm needing to search for all disks that have the Ceph OSD type GUID: ...
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0answers
135 views

Disk configuration options, what can affect performance

I have 2 disks, the same model and vendor, first one , probably performs faster. We do write into multiple files. Can you compare 2 configurations and tell what can affect performance? 1. (faster) ...
1
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1answer
446 views

Access Macintosh HD from Ubuntu - Permission denied

I've followed this instructions and now I'm able to access my Machintosh HD from Ubuntu, the problem is that I can't access the folder I need (example Desktop), it say that I haven't enough ...
0
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1answer
142 views

LinuxMint “File System” shows no space when many GB exist

I have a VM running LinuxMint 17.1. I just resized the virtual disk, then used a live CD to resize the system partitions. I now have 18GB+ free. However, when I look in Files, "File System" shows as ...
0
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1answer
120 views

how to fetch SMART attributes in SSD?

I have a SAS SSD and I want to know few things like "Perc_Lifetime_Remain", etc. In the exisiting SATA SSD drive, we are fetching these info by using smartctl tool ("smartctl -A diskname"). But the ...
0
votes
1answer
2k views

“fdisk -l” output: what are Disk label type“ and ”Disk identifier"

fdisk -l output: . . Disk label type: dos Disk identifier: 0x0006a8bd . . what are Disk label type" and "Disk identifier" Also, apart from the manuals, where else can I find more information ...
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2answers
558 views

Unable to copy large file onto ext2 usb stick [closed]

I have an 8G usb stick (I'm on linux Mint), and I'm trying to copy a 5.4G file into it, but getting No space left on device The filesize of the copied file before failing is always 3.6G An output ...
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0answers
195 views

/proc/diskstats and iostat are right? strange values on my test

My question is quite simple.. I am doing some tests to confirm the perfect work of both (diskstats and iostat) disk meters and something is wrong here. I write this command on cmd and I get the ...
0
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1answer
42 views

What are the commands to discover lun disks [closed]

What are the commands to discover LUN disks in linux and esxi?
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1answer
934 views

Remove all traces of GPT disk label

I've got an USB pen drive and I'd like to turn it into a bootable MBR device. However, at some point in its history, that device had a GPT on it, and I can't seem to get rid of that. Even after I ran ...
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2answers
63 views

3tb external hard disk on 32 bit system

i have a 3tb hard disk with an external docking station that i can not use on my (old 265 mb) windows xp pc, because the pc is only 32 bit. I plan to use a usb2 flash drive to boot into linux (e.g. ...
0
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2answers
618 views

Debian : Mounting a raid array

I have a Debian system on which we migrated to a SSD for faster execution. Before that we had a 2.0Tb hard disks in RAID. Now we want to use the RAID drives to perform storage generated by the ...
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0answers
169 views

How can I get read/write instant speed of a Hard Drive using /proc/diskstats data?

I know that the proc/diskstats file presents these data columns: 1 - major number 2 - minor mumber 3 - device name 4 - reads completed successfully 5 - reads merged 6 - sectors read 7 - time spent ...
0
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1answer
60 views

Increase disk space without losing any data

I have a server running webmin/virtualmin in debian 7 with one 80GB hard drive. I want to increase disk space adding a second 1TB disk, but without losing any data as I'm hosting a few websites. Any ...
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2answers
108 views

Where are all the disks used?

This is almost a little embarrassing to ask, but I just can not figure this one out myself really. I'm trying to find out where the disks of my machine are used and if they are actually used at all. ...
2
votes
1answer
653 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 ...
4
votes
2answers
174 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. ...
1
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1answer
156 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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1answer
88 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 ...
8
votes
1answer
2k 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
209 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 ...
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0answers
159 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 ...
2
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0answers
123 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 ...
1
vote
0answers
161 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
665 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 ...
7
votes
2answers
7k 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 left bar) I get two options that have me confused: eject and safely remove. The closer I came to answer was this ...