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

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12k views

Performance differences between 2.5“ vs. 3.5” SAS

What real performance gains/losses are there on 2.5" vs. 3.5" 15k SAS drives. Are folks really seeing seek differences, &c?
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5answers
990 views

Linux: how many disk I/O does it take to read a file? How to minimize it?

According to this paper on Facebook's Haystack: "Because of how the NAS appliances manage directory metadata, placing thousands of files in a directory was extremely inefficient as the directory’...
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5answers
721 views

WipeDrive Utility?

What is the best and fastest wipe drive (zero fill) utility that can be burned to a CD?
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4answers
5k views

Maximum safe hard drive temperature?

I have two new-ish 1TB hard drives in my server, both running at 38 degrees C at the moment. Should I be worried?
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5answers
24k views

Replacing a dead hard drive in RAID 5 with a different type

One of the drives failed in my server configured with RAID 5, and I can't find a exact replacement. From my understanding, RAID 5 supports drives with different sizes. Is this safe? Any ...
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2answers
6k views

RAID 5 with big SATA disks. Do or don't?

Is it sane to build a machine with RAID 5 expecting to hold around 5 Tb (and able to grow) with 1.5 or 2 Tb SATA II disks? It will be used as audio and documents storage. I already have chosen a ...
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8answers
11k views

Can you use your own drives on Dell PowerVault MD3000i?

I would like to use my own drives in the Dell PowerVault MD3000i. Does anyone know if you are able to? We are looking at different SANs for our VM farm and would rather be able to replace a drive in ...
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8answers
8k views

Hard Drive Speed: RPM vs. Cache

When trying to choose a SATA magnetic hard drive (not SSD) for high performance for both random and linear access, which should be the primary factor? For example: would a 10k RPM drive with 16MB ...
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3answers
2k views

Problem with slow hard disk

We bought some new PCs in my company with the new iCore 7 and 8GB memory and the following hard disk: WESTERN DIGITAL WD8000AARS 800GB CAVIAR GREEN SATA2 The problem we have is that after installing ...
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4answers
4k views

Is it normal for a SAS drive to have a few bad blocks, or should I replace my drive ASAP?

I have a drive—part of a RAID 1 mirror—that has two bad blocks. Adaptec Storage Manger e-mailed me when it detected the blocks. It shows 4 medium errors for that drive, but state is still “optimal”. ...
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6answers
642 views

Is there a Linux utility that can distribute files to an array of hard disks, like a load balancer, but for storage?

I have 2 1TB disks not in any RAID configuration. I'd like files I need to store to be placed on one of the disks depending on the capacity of the disks, and when accessing the file I suppose I'd need ...
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6answers
18k 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.
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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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2answers
28k views

How do you repair a damaged or corrupt partition? [closed]

I have a user with an external hard drive that is no longer recognised: the drive letter does not appear in My Computer. The drive is a Western Digital My Book Essential Edition (WD2500C032) With ...
5
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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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6answers
13k views

Does this SMART selftest indicate a failing drive?

I'm wondering if the results of this SMART selftest indicate a failing drive, this is the only drive that comes up with 'completed: read failure' in the results. # smartctl -l selftest /dev/sde ...
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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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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
1answer
11k 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
7k 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
6k 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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2answers
13k 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 ...
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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
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2answers
396 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 ...
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1answer
362 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 see,...
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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 ...
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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 ...
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5answers
659 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. ...
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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
12k 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 ...
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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 ...
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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
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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
293 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 ...
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1answer
515 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: [...
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6answers
23k 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 filesystem(s)...
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1answer
958 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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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
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3answers
280 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
222 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 ...
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1answer
313 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 doing....
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1answer
512 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
241 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 ...
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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 ...
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1answer
114 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
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1answer
267 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
660 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 drives ...