Questions tagged [storage]

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2answers
137 views

Preventing /dev/sda*, sdb* from being created, while leaving /dev/disk/by-uuid/* or /dev/disk/by-label/* intact

If I wanted to prevent the creation of /dev/sd{a,b,c,...}{,1,2,3,...} devices in my system, but still have /dev/disk/by-uuid/* and /dev/disk/by-label/* created for those disks, could I do so, sanely/...
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1answer
52 views

How to mount large drive

I have a computer with a 250 or so SSD and a new 10 TB drive. How should I mount the new drive? I have seen some examples on the web where the person just mounts it to a randomly named root path like /...
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1answer
10k views

df command shows 100% full, even after deleting files it shows same usage (100%)

Nand Flash storage partition shows as 100% full with df command. When manually calculated the usage it is about 7-80%(max) only. Deleted few files (say around 50~60MB), still df command output did not ...
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0answers
141 views

Use from multiple sessions of iSCSI

I have set the configuration file of iSCSI to attempt login at startup. The system creates two session with two different targets. How can I format and mount a particular node using the existing ...
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2answers
53 views

Will very large write/deletes affect performance of SSD?

Suppose I have a 512gb SSD on a Macbook Pro. I then want to temporarily (for a few days) store 300gb of content on that SSD. Then that 300gb will be deleted. If done multiple times, would this ...
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0answers
1k views

LUN larger than allowed by the host adapter

We have HP DL-360-g9 server which has HP240 Raid controller and currently we have total 4 disk installed 2 (Mirror) for OS and 2 (1TB) individual disk in LVM group. now we running out of storage and ...
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1answer
426 views

shrink /dev/sda3 and create another VG - centOS 7

I have CentOS7 with RAID0. by default the OS create three partitions so the 3rd partition is LVM. my goal is to decrease the size of the 3rd partition and create another VG. [root@localhost ~]# ...
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1answer
31 views

Rescanning of LUN process in Redhat Linux

I use the below syntax to find newly added LUN from server end. I just wanted to know the exact meaning/ process of "- - -". Can anyone explain me about that? echo "- - -" > /sys/class/scsi_host/...
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0answers
45 views

Multipath — Ignoring internal disks

I want to configure multipath such that it ignores all the internal disks and only sees SAN Luns. Any idea how can I achieve that? Basically I want to filter out all the internal disks like IDE, SAS ...
2
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0answers
180 views

How to move LVM to new server

The current setup of my server, I have a storage disk array (RAID60) which hold 110TB of data. All the data is stored in multiple volumes created by LVM. Now, I want to upgrade my server with Cent OS ...
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1answer
1k views

How to find the processes causing high write i/o on the storage

Now a days in one of the DBS, High write I/O is seen on the storage during a particular time everyday..Is it possible to find which process is doing this high write I/O..Any OS related commands to ...
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1answer
981 views

monitor iops sizes

How to monitor size of the storage iops on a modern Linux ? I'm able to monitor quantity of the storage iops using commands like iostat. However I would like to know the size of the iops which are ...
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2answers
450 views

Sharing a network drive between Linux and Windows

I am currently installing a Linux distro onto the SSD of a new desktop in my home. This PC will also have a HDD for storage which will be permanently mounted on this Linux OS, but I would also like to ...
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1answer
41 views

How to get more informations about this device?

If I only have the following information, how can I figure out what this device is ? # df -Ph /dev/cciss/c0d0p1 I know that "sd" are SCSI disk, "hd" are IDE disk etc. So what about "cciss" ? What ...
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2answers
355 views

Recommendation for usb drive pool

I have a server with a large amount of storage. I also have a bunch of large USB drives that I would like to use as a backup volume. My question is, on Linux, is there any reliable way to do a ...
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2answers
2k views

-bash: cannot create temp file for here-document: Permission denied [duplicate]

This error recently appeared on my Raspberry Pi. I get this error when I try to autocomplete folder paths. It won't autocomplete commands at all. I don't get this error when I'm logged in as root. ...
3
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1answer
793 views

why resize a PV instead of adding a new PV?

When you increase the size of a an existing block device (eg /dev/sdc was given 20 gigs from vmware, now it has been increased to 40 gigs), you need to do some work for LVM to use the space. All the ...
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2answers
119 views

Why don't LVM and RAID require a clustered filesystem

So, LVM and RAID can create virtual storage devices that can span multiple physical HDDs. After creating logical volumes or a RAID device, the usual thing to do is format the device with a filesystem. ...
1
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1answer
226 views

Why do I need to read from a tape 3 times to read 2 archives?

After writing two tar archives to a tape: $ mt -f /dev/st0 rewind $ tar cvf /dev/nst0 first $ tar cvf /dev/nst0 second Why do I need to read from the tape three times to read the two archives? $ mt ...
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1answer
451 views

Why is there no lost+found directory in storage pool?

I am studying this Red Hat documentation, which states that a validated storage pool should have a lost+found directory to indicate that it is properly mounted. I have followed the instructions ...
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1answer
356 views

How to format a 16GB pendrive to store only 2GB

I need to produce a custom live Lubuntu version on a 2GB pendrive. But don't have the pen right now, so I need to test it with the 16GB that I have at hand. The system won't start the live version if ...
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3answers
8k views

Moving space from one partition to another?

I am really uncertain if this is possible or how I would go about fixing this problem. Filesystem Size Used Avail Use% Mounted on udev 14G 12K 14G 1% /dev tmpfs 2.8G ...
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1answer
2k views

In which file does Chromium store session storage data of the HTML5 webstorage

I am trying to find the file where Chromium stores the session storage. In ~/.config/chromium/Default/Session Storage there are a few files which seem promising: user@desktop-04:~/.config/chromium/...
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0answers
308 views

KVM/QEMU hot-replace raw disk

One of VM disks got damaged and I'm trying to replace it online, without rebooting VM. However when I use: drive_add virtio1 file=/dev/sdb,format=raw,if=virtio,cache=none,aio=native in VM monitor ...
1
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1answer
271 views

Separate /home partition on arch-based distros take more space than used [duplicate]

/dev/dm-1 861G 325M 817G 1% /home I have a separate luks encrypted /home partition with 861G allocated out of a 931G HDD. The usage is around 1%, but the availabe space is only 817G. I am having ...
4
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1answer
3k views

Convert a single-drive LVM volume to a striped volume across 3 drives

On my server using LVM, I have a simple linear LV on a single drive (PV). Now, I added 2 more (same size) drives (PVs) to the server. I want to convert my existing linear LV to a striped LV (RAID0 ...
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3answers
4k views

How do I increase the size of my active partition after resizing virtual disk?

I'm running a web server that has run out of space. It's running as a virtual machine on VMware ESX and I have doubled the size of its hard drive. Disk /dev/sda: 96 GiB, 103079215104 bytes, 201326592 ...
2
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1answer
3k views

Why VMs terribly struggle with i/o when host is under heavy load i/o wise?

I noticed plenty of times already that when host OS is under heavy i/o load all VMs start to incredibly struggle with i/o up to point where they fail to even boot with systemd giving CPU stuck ...
2
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2answers
289 views

Read only file system, which allows also temporary write to other destination

Is there any file system which allows reading from an existing network share, but also writing to the "mount", but those writes are only temporary? To let you know the background: We have around 4TB ...
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2answers
98 views

How is reliability achieved with SCSI and SAN?

I am pretty new to SCSI and actually not even sure if this is the correct forum to ask. (I did because I found some SCSI questions :) So please feel free to improve/migrate this question. I am ...
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0answers
2k views

How to logout from multiple iscsi targets

I want to logout/delete from multiple iscsi targets iscsiadm --mode node --logoutall=all this will delete all the connections present in the system. How do I delete multiple nodes in just one ...
2
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1answer
825 views

cloned drive won't boot. (It was a LUKS encrypted drive)

I have an SSD I removed from a system. It had full disk encryption via LUKS (without using LVM). I want to reuse this drive for a different purpose (in a different system). I cloned (using dd) a non-...
2
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0answers
522 views

How can I check if sata controller supports hotswap?

Is there a programmatic/generic way to check if sata controller supports howswap? I'd love this question to be generic, so people can apply answer regardless of controller they have. However, in ...
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0answers
38 views

How to safely discharge UPS using workstation (prevent filesystem damage)

I'm using quite big UPS comparing to hardware attached to it in order to achieve longer uptime on UPS (up to 1h). However as maintenance practice it's advised to discharge it at least every 3 months. ...
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1answer
219 views

Zip file has different size after copied to flash drive

I created a zip archive named tmp.zip. It has a size $ du -h tmp.zip 1.7G tmp.zip I copied it to flash drive $ du -h /media/tb/tmp.zip 1.5G /media/tb/tmp.zip What's wrong here? How can I ...
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1answer
149 views

What is the safe fill limit of XFS partition?

Recently i purchased couple of 4TB drives with the intent of archiving camera footage on them. Naturally, I'd like to jam as much data on the two drives as i can. Once the partition is full, it should ...
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1answer
57 views

Script to write terabytes of data on a memory card [closed]

I was surfing SuperUser while I got to see an answer where a person told that it is possible to write Terabytes of data to a memory card using a script? Can anyone tell about that script? and how it ...
0
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1answer
558 views

Can't make hba connection work on centos 7

I am currently using an old server with an old storage connected by fiberchannel. On the storage side I left everything configured but on the server side I do not see the disk that was created for it....
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1answer
160 views

Linux mint doesn't show all the free space available

I installed Linux mint on my 64gb flashdrive using Rufus, with the default settings according to this guide (ubuntu.com/download/desktop/create-a-usb-stick-on-windows). When I boot into mint, the file ...
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0answers
53 views

software-level error detection and correction for raw storage

If I understand data storage correctly, all storage devices are unreliable to some extent, which is why most have hardware-level abstraction layers. Hard drives use error correction. If a sector is ...
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1answer
209 views

Removing a Drive from a RAID

I set up a RAID 1 of 2 drives using mdadm on a Linux machine. What would happen if I – while the device is busy – disconnected one of the drives and then some time later reconnected it? Assume that ...
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2answers
15k views

Why is sync so important when making a bootable linux usb stick?

From the Arch Linux Wiki: https://wiki.archlinux.org/index.php/USB_flash_installation_media # dd bs=4M if=/path/to/archlinux.iso of=/dev/sdx status=progress && sync [...] Do not miss ...
2
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1answer
3k views

GlusterFS replicated volume - mounting issue

I'm running GlusterFS using 2 servers (ST0 & ST1) and 1 client (STC), and the volname is rep-volume. I surfed the net, and read all articles explaining how to fix mounting issues but ...
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4answers
634 views

Does UNIX search for directories using binary search?

I am currently reading the book Advance UNIX Programming by W. Richard Stevens and I read there that all the files on UNIX have a number, and that the file names are created just for user convenience. ...
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0answers
154 views

Arch Linux: not able to get to Nokia phone storage

I have a Nokia 230 mobile (basic model). I am using Arch Linux. I was able to connect mobile to my laptop using USB and was able to see the storage files using pcmanfn (file manager). I used to get ...
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2answers
10k views

How do I check TRIM?

I have Linux installed on a Dell XPS 9343 with an Samsung PM851 SSD. I recently read that many SSDs don't support TRIM operations. So I'd like to check if discard option effectively works on my system....
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1answer
904 views

More space needed on /opt filesystem even after storage extension

Trying to install an rpm with yum localinstall and I get: Transaction Check Error: installing package streamsets-datacollector-1.5.1.2-1.noarch needs 542MB on the /opt filesystem Error Summary -----...
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1answer
243 views

What is the proper path to expand /root LVM

I have recently added a 562 GB to a virtual machine in Vsphere. I expanded the /dev/sda2. I performed the 8e LVM... and now executed pvresize /dev/sda2 My goal is to expand the LVM for root partition....
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1answer
128 views

Can I reclaim “unrecoverable partition” on storage device (RAID set) - no data recovery required

I would like to know if I can reclaim all of my storage. I do not need to recover data, I am free to be as invasive as I need to be. Situation: two controllers, each with eight disks, two RAID sets (...
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1answer
394 views

Fedora 24 Boots to read only

Ok so I have been researching this problem all day but I have a clean install of fedora 24 server and after installing some virtualization packages and rebooting from the console it boots up with the ...