Questions about hard disks' performance, issues, tips, and software.

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6answers
17k views

What is the recommended temperature range for a hard drive?

What is the best temp to keep harddrives running in? I have harddrives that keep failing due to the temp being to high.
5
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6answers
244 views

In a managed environment, should user PCs have local external HD backups?

Our environment manages thousands of user PCs, provides high-end secure file servers. Users (from new staff to executive-level) are urged to store data to the file servers and generally do so. PCs ...
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1answer
3k views

Can I get the model information for my hard drives with a command in Linux?

Is there a Linux command that would allow me to get model information for hard drives? I'm running CentOS. I want to compare the hard drives on two VPS providers that I use.
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votes
8answers
1k views

Hard drive partitioning software for Windows

I'm looking for a good disk partitioning/management software suite. I've been using Acronis Disk Director but I've had a few data corruption issues which I think might be related to it (especially ...
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votes
3answers
5k views

How to stop a linux server from beeping when a RAID HDD has failed

A HDD has just failed on a linux server (Red Hat Linux release 9) we support. Not a big problem since it's on a RAID (MegaRAID SCSI). We're now in the process of getting a new one to replace it. In ...
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7answers
4k views

What is faster? A local mechical hard drive or a solid state drive over gigabit ethernet?

SSDs are rather new, so I couldn't find this information on the Internet. Would the performance of a local hard drive connected using SATA2 get out performed by a SSD over gigabit ethernet? In terms ...
5
votes
2answers
6k views

How to know which disk has failed on a Mirrored Raid? marked as DR0

Our 2ndry DC, which is on a W2K8R2 Mirrored software raid has lost it's sync, and disk management displays the failed redundancy error How do I know which of the disks has failed? (beside to try ...
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4answers
5k views

How reliable is HDD SMART data?

Based on SMART data, you can judge the health of a disk, at least that is the idea. If I, for instance, run sudo smartctl -H /dev/sda on my ArchLinux laptop, it says that the hard drive passed the ...
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1answer
10k views

Server 2012 Core (no GUI) - How to manage disks?

I am working on Server 2012 which doesn't have a GUI. For now, I have two hard disks. My first one is already formatted and I see it as C: Now, I'd like to format my second hard drive and create a D: ...
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2answers
12k views

Mixing dual and single port SAS disks

I have a HP DL380 G5 with 8x146GB single port SAS SSF disks (DG146ABAB4). A couple of them have failed and I can't find any new single port disks anymore. They all seem to be dual port. I'm wondering ...
5
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1answer
2k views

iotop and iostat disagree

I'm trying to understand what's going on with my server's disks. It's running Ubuntu 12.04LTS and I'm used to using iostat to know when the disk is the bottleneck. But iostat -xd looks to me like ...
5
votes
2answers
374 views

raid controller data transfer rate

I'm going to buy an 8-port raid controller for which the declared data trasfer rate is "Up to 6Gb/s per port". The declared connectors are "Two mini-SAS SFF8088". The maximum number of supported ...
5
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1answer
356 views

Is it possible to calculate where is, physically, a bad block located on a hard disk?

I dd_rescue'd a hard drive, and I know where the bad blocks are. I still have the drive with me, so I can get any information needed from SMART or fdisk. I would like to know if it is possible to ...
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votes
3answers
3k views

When to use Truecrypt, and when not to?

I have about 30 (this number will most likely grow over the next few years to 50 or more) unencrypted laptops that I have been tasked to encrypt (entire drive). These machines will be used off site ...
5
votes
3answers
17k views

How to create a RAM Drive (RAM Disk) in Windows 2008 R2?

There are lots of tools for creating RAM drives. None of them seem to work for windows 2008 R2. Does anyone know if this is possible and if so how. Does anyone know of a tool that does work? I've ...
5
votes
5answers
656 views

Unix command to suspend a job while there is console activity?

I want to do a large disk transfer, which slows down responsiveness of my system. What I want is a Unix command that will only run the command after I have been idle at the console for a few minutes. ...
5
votes
3answers
4k views

How do I discover which process is making my hard drive go crazy? (need disk io equivalent of task manager's cpu % column)

When I notice my system getting sluggish, the first thing I do is open up Task Manager to see if some process or another is using up 100% of the cpu. What do I do when I hear my hard drive churning ...
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2answers
11k views

What is QSignoff?

The QSignoff folder uses a lot of disk space, can is be pared down without issue?
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4answers
4k views

Does virtual hard disk fragmentation reported by a guest machine matter?

We have a VM Ware ESXi virtual machine, where the guest is reporting high fragmentation. The host virtual machine file is not fragmented. The datastore is on a RAID 5 array. Does the fragmentation of ...
5
votes
4answers
5k views

Which FileSystem is best for CentOS 5 on SSD?

Background: We have gigs of data, which require to process large files simultaneously and in parallel with similar processes. We are going to get SSD just because of fastest latency. We will install ...
5
votes
4answers
5k views

How much impact does hard drive cache have on IO performance

How much impact does hard drive cache have on IO performance Are there any statistics or performance tests available that can tell me if there is a difference is 16MB vs 32MB Cache? If it matters, I ...
5
votes
2answers
11k views

How can I set the disk partition alignment using linux tools?

After reading Disk Partition Alignment Best Practices for SQL Server, I just want to give those advices a try, but on my linux test server. What are the required parameters in order to set the ...
5
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3answers
286 views

Shared Disk in modern data center (SAN, virtualization, etc)

I'm a developer...treading here on foreign terrain. Please pardon any naivete. I work on an application that stores data both in a database and the filesystem. Context: Clustering and Network ...
5
votes
1answer
514 views

Corrupt files' contents, while FS is OK

Looks like my USB HDD is old and corrupted: rsync: read errors mapping "path/to/file.jpg": Input/output error (5) Syslog: kernel: [58927.940676] sd 6:0:0:0: [sdb] Unhandled sense code kernel: ...
5
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6answers
22k views

How can I tell what filesystems are on a disk in AIX?

I use the tool "topas" to get a quick peek at CPU, memory, and disk statistics on an AIX machine. I understand the numbers on the disk section, but what I don't know is how to tell which ...
5
votes
1answer
907 views

Identify which process is responsible for heavy disk i/o under FreeBSD

I wonder how I can monitor which process takes out all my IO bandwith. The only command i know is gstat but it shows cumulative info. Is there any tools i can use to inspect the running processes for ...
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votes
2answers
1k views

Managing consistent mounting of external USB hard drives in Linux (CentOS 5)

I have configured a server with CentOS 5.2 and am now working out a backup strategy. I plan on using Amanda as the backup application. Additionally, I am leaning towards using some USB hard drives for ...
5
votes
3answers
277 views

Is visiting the memory of a remote system through network faster than local disk seek?

It seems that network connections are usually faster than local disk seek, as discussed in the question Are networks now faster than disks? I come up with this question when I am using Berkeley DB, ...
5
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3answers
221 views

Portable, Direct Attached Storage: does such a device exist?

I'm still a fan of tape. I know it's "dying" but for capacity, longevity, and portability, it's pretty tough to beat. However, I have some clients and prospects that have a "hate-on" for tape and ...
5
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1answer
300 views

HDD is acting up, but S.M.A.R.T says everything is fine

Before I begin, a quick disclaimer. I'm basically a developer forced into a sysadmin role by circumstances, so I apologize in advance if I say something stupid or seem like I don't know what I'm ...
5
votes
1answer
473 views

Why are cgroups (blkio serviced bytes) and iotop producing diverging results

I work with lxc user space tools on ubuntu 14.04 and I want to perform some stress tests and benchmarking within a container. I know that free and htop are not working properly in a container. I am ...
5
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1answer
238 views

26 hard drive limit on x86 servers, IBM x3650, Dell PE 2950, Dell PE 2850, where is my limitation?

This is in regard to mass HDD wiping/testing. The software I use, WipeDrive Pro 5 and 7, both fall victim. I originally thought it was a limitation of the software, but after speaking with the ...
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1answer
5k views

Mounting an old LVM hard drive in Fedora 17 gives error message

On Fedora 17, I am trying to mount a hard drive as slave using the following command: mount /dev/sda5 /mnt/fedora8 And I get this error: mount: unknown filesystem type 'LVM2_member' How do I ...
5
votes
2answers
111 views

Is it true that is better to differentiate manufacturers when buying Hard drives for a server?

This morning, listening to Stack Overflow podcast #35 *, talking about Server, RAID controllers and Hard Drives, I heard this thing: if you are going to buy Hard drives for your server, you would ...
5
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1answer
101 views

Root-causing vastly different performance on iozone O_SYNC benchmark for two HDD manufacturers

I have two servers A and B with the following configuration: A: 4TB HDDs, with RAID 1 (MegaRAID SAS 2008), 128MB cache, no BBU, write-through mode, 7.2k RPM, manufacturer A. B: 1.5TB HDDs, with RAID ...
5
votes
1answer
245 views

Getting Error: “No space left on device” for a particular filename

I have a ext4 volume with lot of files inside a particular directory. Whenever I am trying to create a file inside it of a particular name, I am getting "No space left on device" error. $ touch ...
5
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1answer
652 views

RAID-5 or RAID-6 - is RAID-5 really that bad? [duplicate]

Possible Duplicate: Which is better: RAID5 + 1 Hotspare / RAID6? I need to decide myself between RAID5 and RAID6. The servers have a hardware-RAID controller and 6 drives each. The ...
5
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4answers
26k views

Is there a reliability difference between 2.5“ and 3.5” HDDs?

I know there are a couple of key characteristics that determine the reliability of HDDs, but is there a difference between 2.5" and 3.5" drives? In the past I've always assumed that 3.5" drives ...
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5answers
5k views

Which hard drive corresponds to ata1.00 and ata12.00?

I have an Ubuntu installation which has a lot of hard drives. Two of these drives have hiccups and SMART is reporting errors. However, I cannot figure out how to determine which drive is ata1.00 and ...
5
votes
3answers
272 views

Can a VM's virtual disk span over multiple nodes in Ubuntu Enterprise Cloud?

How does storage works with the ubuntu enterprise cloud? If I have two disks (on separate machines) with free space 10gb and 20gb, can I have a VM running with 30gb of disk space?
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2answers
3k views

Mount an ext3 partition with a 16k blocksize?

We are attempting to recover data from a drive which was formated by Netgear ReadyNas Duo. We have dropped it in a linux box and discovered that it is formated as ext3 with a 16k block size. Mounting ...
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3answers
2k views

How do I calculate the disk subsystem i/o capacity

I am trying to figure out the number of 8K page i/o capacity for a disk subsystem. The drives are SATA 7200 RPM - 4 drives in a RAID-5 configuration. I am not sure about the SCSI controller but the ...
5
votes
1answer
4k views

Change owner of LVM LV's device node in RHEL5

First time using serverfault, please excuse any breaches of etiquette. I've created several LVM2 logical volumes in local storage on a server, and would like one of the device nodes - not the ...
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2answers
1k views

NGINX Serving Large mp4 Files extremely inefficiently

I am currently running nginx/1.0.15 on a Centos 6.6 OS. The server has the following specs: Intel(R) Atom(TM) CPU C2750 @ 2.40GHz (8 cores) 32GB Ram 5 x 6000 GB 7200 RPM (Raid 10) The Problem The ...
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2answers
5k views

Issues with Server 2012 using DFSR running on Hyper-V 2012

We have a number of Server 2012 systems, all of which run virtualised on Hyper-V 2012 server. We are having problems with two such virtual instances, both of which are used as file servers, whereby ...
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2answers
2k views

e2fsck extremely slow, although enough memory exists

I've got this external USB-Disk: kaefert@blechmobil:~$ lsusb -s 2:3 Bus 002 Device 003: ID 0bc2:3320 Seagate RSS LLC As can be seen in this dmesg output, there is some problem that prevents that ...
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2answers
1k views

Disk (EXT4) suddenly empty without any sign of why

I have a Ubuntu 10.04 server with several disks in it. The disks are setup with a union filesystem, which presents them all as one logical /home. A few days ago, one of the disks appears to have ...
5
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1answer
265 views

Possible to migrate RAID 10 system from 2TB Seagate to 2TB WD?

A couple of our servers have ST32000641AS (2TB Seagate desktop drives) in RAID 10 using an Adaptec 2405 controller. I've been told by Adaptec that this is a bad idea and we have, in fact, already ...
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2answers
2k views

HP 4TB SATA Midline in D2600 - what disk make is HP using & why WD RE4 don't work?

Does anyone know what make of disk HP are using in their 4TB SATA Midline & why WD RE4 don't work? So we use D2600 crates with HP 2TB disks, and just buy WD2003FYYS - pop them in old HP caddies. ...
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5answers
2k views

What options are available to perform whole disk encryption with Snow Leopard

We would like to encrypt the entire disk of a Snow Leopard workstation running some sensitive file, database and web services. PGP does not yet work for 10.6, and we cannot use FileVault as it is not ...