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0
votes
3answers
51 views

Compress and remove original directory with limited storage

On my 3 TB external hard drive, I have a 2.7 TB directory containing relatively small files. I would like to compress this 2.7 TB directory and remove it to keep only the compressed version. The issue ...
2
votes
2answers
617 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 ...
4
votes
1answer
4k views

Clear unused space with zeros (btrfs)

How to clear unused space with zeros ? (I am asking for tool for btrfs filesystem) I'm looking for something smarter than cat /dev/zero > /mnt/X/big_zero ; sync; rm /mnt/X/big_zero Like ...
2
votes
1answer
392 views

storage server all nfs users on full 666 file permissions

How can I setup a shared storage location on a storage server shared via CIFS and NFS and all files written by CIFS and all users via NFS to write files and folders with full read/write permissions ...
1
vote
1answer
64 views

To which device file is particular storage device mapped?

I noticed that I never figured this out completely. Linux maps SATA and USB (and many more kind of) storage devices to /dev/sd[a-z] device files in the order in which they were "found". Now given that ...
1
vote
1answer
188 views

Can I use fio on a mounted device?

I'm using fio to get some broad read IOPS performance data for various storage configurations like this: fio --name=readiops --filename=/dev/md1 --direct=1 --rw=randread --bs=4k --numjobs=4 ...
0
votes
1answer
38 views

How to deactivate linux page/disk cache?

I would like to turn off the disk / storage cache on Raspbian. I have done a serie of benchmarks on the microSD (http://jgp.net/microsd-card-performance-raspberry-pi/) but some people recommended I do ...
0
votes
1answer
17 views

Azure Ubuntu Partition management

I'm working on an Azure Ubuntu VM root@dalil:/# df -h Filesystem Size Used Avail Use% Mounted on udev 1.7G 8.0K 1.7G 1% /dev tmpfs 345M 392K 344M 1% /run /dev/sda1 ...
0
votes
1answer
33 views

Migrate to a new vdisk

I have to migrate some data to a new vdisk. But i have no idea how i can do this. The old Vdisk is under /dev/mapper/12345 which is a link to /dev/dm-1 The new Vdisk is under /dev/mapper/67890 which ...
0
votes
1answer
35 views

Reasons why does the os have only limited information about the layout of data on hard disks

Do someone knows some reasons why the os has only limited informations about the layout of data on hard disks(with regard to locality)?
0
votes
1answer
32 views

Restricting access to an in-use disk on Solaris

I have two identical servers (Running Solaris) connected to a Sun Storedge 3100 through SCSI. I want to make a cluster out of them. The storage will be used to store a database. The Storage works ...
3
votes
0answers
195 views

Inaccessible USB Mass Storage Device (Bricked Garmin device)

I've got a running GPS watch (Garmin Forerunner 210, fwiw) which recently got bricked during a firmware update. Let's assume for point of discussion that an rma is not possible, so I'd really like to ...
2
votes
0answers
16 views

confused about dd write speed and VFS page cache

After reading some articles on the Linux VFS page cache and the tunable parameters like dirty_ratio i was under the impression that page cache would operate as both read and write caching layer. But ...
2
votes
0answers
214 views

Reduce cache size of flash storage devices

For various benefits Linux uses a memory cache for writes to removable stogare devices like memory sticks. This cache seems to be quite large on my system, which leads to some annoying behavior. For ...
2
votes
0answers
1k views

`crontab -e` sometimes fails with “Creation of temporary crontab file failed”

From time to time crontab -e fails on me on a Ubuntu box. It is the same for all users including the root and crontab -eu <user> under the root. Goes like this on a regular basis, a success here ...
2
votes
0answers
346 views

Set PERM_WRITE_PROTECT on an SD card

From what I read here and here I gather that there is a bit on SD cards called PERM_WRITE_PROTECT that will allow me to make an SD card read only. Is it possible to set this bit from Linux? If so, ...
2
votes
0answers
79 views

Too large cache causes disks to grind, I/O to drop

This is a followup question to my earlier problem. In short I was experiencing massive I/O drops together with not-so-violent disk grinding, and with help I found out that the big caches were the ...
2
votes
0answers
289 views

Move boot disk on SAN storage on Solaris 10

I'm looking for some infos/official docs/howto for migrating boot disks in a production enviroment server from internal disks to SAN on Solaris 10. It's possible for every kind of hw? It's also ...
2
votes
0answers
63 views

Limiting write rate of a device

How does one go about limiting the write/read rate of a device, E.G., USB drive, SD card? Motivation behind this question is covered here (superuser.com).
2
votes
0answers
325 views

How do create an encrypted system with multiple Linux distributions?

A few weeks ago I created a completely encrypted system on a notebook and must say I like the idea. It's a little bit annoying to enter the password on every boot, but it's nice to know even if I lose ...
1
vote
0answers
16 views

Difference between multipath -ll command and multipath -l command

From the multipath man page http://linux.die.net/man/8/multipath multipath -l shows the current multipath topology from information fetched in sysfs and the device mapper while multipath -ll shows ...
1
vote
0answers
48 views

bcache not working as expected with ramdisk as cache device

I was trying out bcache but i don't have an SSD so wanted to use free memory as a substitute. As ramdisk is listed in /proc/devices as block device i assumed this would work OK but with below simple ...
1
vote
0answers
16 views

How much control do concrete file systems have over the VFS inode cache and the buffer cache?

I want to make sure I'm understanding how VFS inodes and file system inodes working together. A file system's inodes are stored on the block device and that is where they live. When an operation is ...
1
vote
0answers
39 views

FreeBSD 10.2 - Is three-way HAST replication possible?

I have a pair of FreeBSD 10.2 servers using HAST to keep a volume replicated between them. I'm introducing two new storage nodes that have much newer hardware and will eventually replace the existing ...
1
vote
0answers
44 views

Are partition and volume the same concept?

From Silberschatz's Operating System Concepts A storage device can be used in its entirety for a file system. It can also be subdivided for finer-grained control. For example, a disk can be ...
1
vote
0answers
33 views

Strange: Read Only FS

I am using LFS-based OS onto a 4GB storage device. Everything was working fine for more than 6 months. But suddenly, the storage device itself became Read-Only. No matter, what I do with this storage ...
1
vote
0answers
82 views

Can't install EncFS

I have a 32GB SSD in my laptop and PCManFM 1.2.0 is showing 14.5GB free at the bottom right corner of the screen in the status bar. However, when I try to install an application such as encfs, I ...
1
vote
0answers
77 views

Unix (NFS Error)- 7320 Storage

I get the following errors on one of my servers: NFS op OP_OPEN got error NFS4ERR_DELAY causing recovery action NR_DELAY NFS op OP_WRITE got error NFS4ERR_STALE causing recovery action NR_STALE NFS4 ...
1
vote
0answers
883 views

extend the storage of a beaglebone black

I've got a beaglebone black rev B (2gb storage) and I want to use it to run owncloud as a self-hosted cloud. The beaglebone comes with 2gb of storage, which means that it has just enough room for the ...
1
vote
0answers
1k views

I can't find tape device file inside /dev directory

I'm using tape storage drive HP LTO3 1x8 auto-loader which is connected to my server running CentOS. it is detected in CentOS correctly. cat /proc/scsi/scsi Host: scsi2 Channel: 00 Id: 01 Lun: 00 ...
1
vote
0answers
157 views

Mount an SD card over USB?

I'm currently using: insmod g_file_storage.ko file=/dev/mmcblk0p1 stall=0 removable=1 This works as I can see the device in Windows. However when it comes to changing a file, the changes are not ...
1
vote
0answers
199 views

iSCSI on startup

I've configure iSCSI but CentOS 6.3 is unable to recognize if on startup. Here is fstab config: /dev/sdb1 /home ext4 _netdev 0 0 Here is iscsi.conf ...
0
votes
0answers
30 views

Linux Mint installation showing entire Windows disk unallocated

I'm trying to install Linux Mint next to my install of Windows 10, but there's a problem. Mint is saying that the entire hard drive is unallocated "free space", though in the file explorer you can ...
0
votes
0answers
25 views

monitoring block access to disk

I am looking for a way to monitor access to disk blocks, and to monitor the access as a bitmap of blocks. I also need the capability to freeze (and queue) the device block access (and also to ...
0
votes
0answers
8 views

How to make Live CD store data in hard drive?

How can I configure a Live CD operating system (Specifically Lubuntu) to use the hard drive as its main storage, not storage simulated in the RAM?
0
votes
0answers
65 views

FreeNAS zpool not found

Consider me as new in FreeNAS storage. Disk failure on our FreeNAS 8.3 After rebuilding and replacing one disk on the RAID we are unable to access or mount the data. There are 8 X 3TB HDDs on the ...
0
votes
0answers
26 views

install redhat 6 without formating multipath disks

I've server RHEL 5 with multipath storage attached to it the OS is installed on local disks now I need to remove rhel 5 and install rhel 6 I perform fresh installation when i do this it shows me all ...
0
votes
0answers
118 views

how can I see the uuid of a disk in my system WHEN IS NOT LISTED IN /dev/disk/by-uuid

I have a problem in my system, that I don't understand: there are no disks UUIDs, only partitions UUIDs: ls -al /dev/disk/by-uuid/ total 0 drwxrwxrwx 2 root root 140 Nov 21 20:36 ./ drwxrwxrwx 5 root ...
0
votes
0answers
21 views

3 TB ext4 partition performance issue

I have deployed Centos 6.6 VM based on vSphere ESXi 5.5, it consists of 2 VMDK (virtual disks): 1st vmdk is for System / with 25 GB second vmdk /var is a 3TB / ext4 underlying storage is RAID 5 ...
0
votes
0answers
84 views

How to automate HP 3PAR in CentOS using Python?

I have worked out in Windows to start 3PAR using python but I am not able to login into 3PAR in CentOS. Additionally I need to know how to view system, hosts, provisioning Tab(list Volumes, Virtual ...
0
votes
0answers
67 views

Find drive for SCSI device

This is the first time that I am working with storage devices. When I run cat /proc/scsi/scsi on my server, I have the following result: Attached devices: Host: scsi0 Channel: 00 Id: ...
0
votes
0answers
25 views

Partitions going offline and coming back online

We have Linux server that has 5 LVM partitions. In that two partitions are going offline and coming back online again and again. It is a critical server. Please help, how to resolve the issue.
0
votes
0answers
97 views

Linux (RHEL) installed on Windows Hyper-V supporting Virtual HBA

I have installed RHEL 6 on Hyper-V as a Guest machine. I have added Virtual Fibre Channel. But I cannot detect in the RHEL. I also don't know how to find it is working or not. Can anyone help me ...
0
votes
0answers
95 views

Redundant and Load Balanced storage on FreeBSD?

Back from: Load balanced & Redundant Storage on FreeBSD How do I create a (Redundant and Load Balanced) Storage based on FreeBSD? Storage should be located on (2 or more servers) providing ...
0
votes
0answers
185 views

Custom Bluetooth Configuration through terminal

I am running a Bluetooth module on my circuit for transmitting data. I want to connect this module to my Linux OS (openSUSE) and read data from it. I want to do custom configs and also custom read ...
0
votes
0answers
266 views

Can't format SSD during installation

Last night I tried to install Mandriva Linux on PC, where I have already Windows 7. In PC I've got 2 128GB SSD and 1 2TB HDD. On one SSD I installed Win7, and when I select the other empty SSD for ...