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

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1answer
25 views

Amazon EBS Durability

According to this link: http://aws.amazon.com/ebs/details/#availabilityanddurability It said: Amazon EBS Snapshot can expect an annual failure rate (AFR) of between 0.1% – 0.5%, where failure ...
0
votes
0answers
28 views

Installing Windows Server 2008 R2 To A Thumb Drive [on hold]

Is it possible to install Windows Server 2008 R2 to a thumb drive? I currently run FreeNAS from my thumb drive but ran into issues with a UNIX OS not supporting Windows ACLs and found out the hard ...
0
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0answers
17 views

File copy, in series or parrallel? [migrated]

I have to copy manually several files and backup a lot of datas. It's from an HP laptop, 7200rpm harddrive sata (no raid), windows 8.1 to an external USB3.0 7200rpm harddrive. Both uses NTFS ...
3
votes
1answer
57 views

How often should I scrub my RAID?

In general I would like to know how often a RAID array needs to be scrubbed. What contributes to the need to scrub more often (reading data?, writing data?, unexpected shutdowns?, drive age?, drive ...
1
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0answers
43 views

HP Dl360e Gen8 Not Detecting Hard Drives

I have a new HP Proliant DL360e G8 and it is not detecting the hard drives. We are using both non-hp, and official hp hard drives from an older server (DL120). Hard drives are 3.5" and they are not ...
1
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1answer
89 views

LSI MegaRAID SAS 9261-8i: Disk isn't recognized after replacement

I've got a Supermicro Server with an LSI MegaRAID SAS 9261-8i Raid Controller inside. There were 3 Disks attached to the controller which were configured as RAID5 array. One of the disks failed ...
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votes
2answers
84 views

Stacking Servers on top of each other without a using a rack [closed]

I have ten 19" servers each with 4 hard drives and an average 160W usage. For a 2 month test run of a service i want to put them just on a table without purchasing a rack. Maybe in two stacks 5 each. ...
1
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0answers
9 views

Errorlevel 2 randomly on Chkdsk - Windows Server 2008 R2

On an always-on Windows Server 2008 R2, hard disks are verified weekly with Chkdsk /F command. Randomly, apparently without a real reason, every 2/3 weeks, chkdsk will return errorlevel 2. I wonder if ...
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2answers
49 views

Alternatives to SMART for Monitoring HDD Corruption

Given that SMART is unreliable for predicting HDD failure, does anyone have a reliable alternative for automating quick identification of hard drives that are beginning to fail? This is for Windows ...
1
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0answers
25 views

Unable to access disks in rhel 6.5

I work for a biology lab. We recently bought a new microscope that produces an enormous amount of data - it is simply not feasible to store it on a desktop. So, we bought a storage server - the idea ...
0
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0answers
21 views

How do I check disk performance of LVM drive?

I have a CentOS server with 2 hard drives configured to use LVM over RAID1. How do I benchmark my hard drive? As seen in this question, I have used the following commands: # check read performance ...
2
votes
1answer
51 views

Limits on Read Transfer from Hard Drives

I just found that the specs of server harddisks mention a maximum number of TB read. For example WD Black Drive 2 TB mentions a 550 TB transfer limit per year. This means that every day it should read ...
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votes
1answer
62 views

Consumer level motherboards that play nicely with large numbers of drives [closed]

I currently have a system with 25 hard drives - 24 for data and one for OS. This machine is built on a budget, featuring a cheap Gigabyte motherboard (GA-990FXA-D3), a four port LSI SAS controller, a ...
0
votes
1answer
90 views

Recover data from ubuntu encrypted drive (LUKS)

I had a Host with Ubuntu 12.10 installed, and the entire harddrive was encrypted (with LUKS it appears), I remember the passphrase, but I have trouble to "open it". I am now on a beta version of ...
4
votes
1answer
102 views

How to access SMART attributes when using RAID with a Dell Perc 4e (LSI)

I can't easily shut down this windows server, so I'd like 'online' solutions. I tried the following unsuccessfully: Seatools Enterprise: caused a BSOD smartmontools: scan only showed virtaul RAID ...
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2answers
53 views

No advantage from SSD boot drive for 24/7 server? [closed]

Since my OS and applications are loaded into memory upon boot, isn't there no advantage from having my OS on an SSD boot drive for a server that is kept up 24/7? I know there are several assumptions ...
10
votes
1answer
882 views

What is the term for this piece of hardware?

This is a silly question but what is the "official" term for what is carrying this hard drive? I need to know if I can purchase it separately from the hard drive.
1
vote
0answers
29 views

Hardware configuration for head nodes (HDDs, memory, processor, redundancy)

I'm designing a head node whose primary function is to submit jobs to the Torque/Maui scheduler and secondary function is to run test jobs. Unfortunately, most hardware selection guides for clusters ...
0
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0answers
34 views

SMART: Raw Read Error Rate Errors on Mirrored Drives

Thanks for reading. I have a pair of 150GB WD Velociraptors that have failed SMART status. The only fail they have is the Raw Read Error Rate, which is as follows. ...
0
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0answers
36 views

UDMA_CRC_Error_Count = 1 after a smart test

I have a server with an Hardware RAID, with one of two hard disks the smart test show this: http://pastebin.com/H86xgcHk The questions are: - What does UDMA_CRC_Error_Count = 1 mean? - It says "ATA ...
0
votes
2answers
60 views

Upgrade Hard Drive - Keep domain membership?

If I upgrade my laptop hard disk by cloning it to an SSD with PartedMagic will my computer fall out of the domain to which it is a currently a member? Doing some Google searching and it doesn't look ...
0
votes
1answer
38 views

Error at partitioning disk

I am struggling to install debian squeeze (64 bit) OS in the system which is having RAID 1. While partitioning the drive, It says an error Operation not permitted during write on /dev/md126 . I am ...
1
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1answer
45 views

SMART “power on hours” attribute for different HDD manufacturers

Is there a table of how to interpret the SMART attribute "power on hours" depending on the HDD manufacturer? Some of them use hours, some minutes or even seconds...
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votes
2answers
215 views

how to fix hard drive errors? [closed]

Suddenly, My hard disk is not working. While booting, It gives failed command: READ DMA and status: { DRDY } error. So, I booted the system with live CD and tried to mount the hard disk. It gives the ...
1
vote
3answers
76 views

Is there a point where harddrive age (Power On Hours) necessitates replacement? [duplicate]

I have several storage arrays where a significant number of the drives have been powered on between 25,000 - 30,000 hours (2.8 - 3.4 years). These drives have no other issues or errors. What I want ...
2
votes
2answers
85 views

SAS disk and intel motherboard

What kind of Cable shall I use to connect [ http://www.amazon.com/SAS-Enterprise-Hard-Drive-WD1001FYYG/dp/B0090UELTW ] and server board: http://ark.intel.com/products/56334/intel-server-board-s2600cp4 ...
0
votes
1answer
110 views

Disk access slow

I have a process running in a CentOS 6.3 server. When logging is turned on, the process slows down drastically. The logs are being written to /tmp [root@localhost src]# hdparm -I /dev/sda /dev/sda: ...
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2answers
197 views

Why does a failed ZFS disk still seem to work fine?

Two disks just failed in my zpool with read/write errors, so I took them out and inserted them in another host, created a zpool just with them, and filled the file system with dd if=/dev/zero ...
2
votes
1answer
121 views

Disk IO cutting out on Windows Server 2008 R2 running in VMWare

We've been trying to fix a problem with our server for about a week now. Only in the past few days have we really found out what the issue is. Just some information up front: We run a VM with a 3rd ...
11
votes
4answers
512 views

Disk Speed Performance in a SAN

We are currently looking into buying a SAN, and have some concerns over the speed of disks we are going to put into the array. We would normally have gone for 15k disks over 10k every time, but one of ...
0
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0answers
35 views

hdparm: Hard drive spin down logs

I've been using hdparm successfully to spin down hard drives on some systems, however I'm curious, is there anyway I can make hdparm generate some kind of spin down log, so I can further optimize the ...
0
votes
1answer
105 views

High CPU load caused by slow disks?

We are running a online application on a 3-year old server (quadcore Xeon, 4GB RAM, SAN-disks). The server hosts besides the web application a SQL-, FTP-, SFTP, SMTP, and POP-services. Over the years ...
0
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1answer
183 views

How to diagnose failed drive on server with raid storage controller?

I have problem with one of my Dell PowerEdge R210. Machine is with Centos 6, today system logs started to inform that the hard drive is failing. Jan 6 03:20:12 centos6 kernel: LSI Debug log info ...
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votes
1answer
45 views

Connecting SATA 3 to SAS port performance analysis

SATA 3 hard disk can be connected to SAS ports. But If i connect SATA 3 drive to a SAS port then can i get same speed as SATA 3 originally offers or will it be a difference? Will it reduce the ...
1
vote
1answer
77 views

Raid Controller not recognizing hdds after removal. Poweredge 6950

I have a Dell Poweredge 6950 running server 2012 with 4 hdds. 80gb raptor (with OS), 2 500gb WD black in raid 0 and a 1tb raptor. I shut off the server, removed the 2 hdds in raid and the 1tb raptor. ...
3
votes
1answer
50 views

Why does fdisk have a discrepancy in translating units between cylinder and sectors?

We were re-partitioning a virtual disk to increase the size of an LVM's physical volume. This is how we initially performed this: $ fdisk /dev/sdb # delete partition fdisk> d ? 1 # create new ...
2
votes
2answers
72 views

Simulate database I/O behaviour [closed]

I'm investigating some performance issue and I need a tool that can mock the same I/O behavior that a typical RDBMS is usually creating. I don't want to install a full blown RDBMS and mess around with ...
1
vote
1answer
85 views

Which filesystem is this volume, I want to mount to an ubuntu server?

See those images below, it shows errors like wrong fs type, bad option, bad superblock, missing codepage or helper program, or other error.... I just tried to mount it as FAT mount /dev/sdf ...
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votes
4answers
67 views

How do I mount a linux filesystem harddisk to a Windows server? [closed]

When I try to mount a linux filesystem harddisk to a Windows server. It will show that the harddisk is not initialized and unallocated in computer management, but it simply does not show up as A drive ...
3
votes
1answer
155 views

Using consumer grade hard drives in a server

My company needs to upgrade a couple of (very) old servers we are currently running, but we are kinda strapped for cash. We got a great offer on a pair of HP DL360 G6 servers, but the hard drive cost ...
1
vote
2answers
78 views

How can it be that mounting and unmounting takes hours to complete?

I am running an Ubuntu server 10.10 machine with 24 hard disks (and two OS drives). I am using a script to mount all the drives to their desired mountpoints. This works pretty fast, as expected, ...
0
votes
2answers
58 views

Missing hard drive on df -H command on Centos 6.4 [closed]

I have 2*1000GB hard drives + 60GB SSD. When I'm running df -H I'm getting "wrong" information about the server's hard drives. The output # df -H Filesystem Size Used Avail Use% ...
0
votes
2answers
100 views

Expandable Linux filesystem w/ redundancy & support for different drive sizes?

I did a bit of research already and didn't come across any filesystems so far that have the following features: Expandability, Redundancy, and the ability to utilize the full capacity of different ...
2
votes
0answers
44 views

Shrinking a volume and extending another in dynamic disk

I have a test environment where I converted a disk to dynamic, shrunk a volume, and then expanded another all on the same disk. The result is that disk management in Windows Server 2008 R2 shows two ...
3
votes
2answers
132 views

Age replacement policy for hard disks and SSDs at servers

I'm planing an age replacement policy for our storage and servers. Most of them are for DBs and some for images (static content) so yes, they have an huge I/O everytime. Also, we use Samsung 840 Pro ...
1
vote
0answers
102 views

best setup for fast sustained streaming (sequential?) disk writes

i am setting up a high speed/high resolution scientific image acquisition system. i need data write rates of ~1 GB/sec sustained for ~1 hour. i don't have experience with raid, but my plan is to ...
0
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0answers
315 views

KVM LVM-based guest… kernel: Buffer I/O error on device. Failing drive?

Currently setting up a small KVM host to run a few VMs for a small business. The server has 2 drives in software md RAID 1, then I have it set as a PV in an LVM setup. Guests and hosts are all CentOS ...
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votes
1answer
315 views

Linux “/dev/SDA” goes read only file system on SDB device failure [closed]

i have a very peculiar issue that is running in my system. Using debian linux : My system boots up very normally with a primary and secondary hard disk. suddenly my secondary hard disk fails with ...
0
votes
1answer
464 views

Dell PowerEdge 1950 physical disk has foreign status error

Dell PowerEdge 1950 has an issue with a raid. I have 2 disks on the raid, and it fails. When looking at Dell Open Manage it is because both disks show as state = foreign. Name State ...
0
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1answer
76 views

HDD operations slow server down, hangs completely

When running a tar cvzf command or copying large folders on the production server, the CPU load goes up to 8.5 (running on 8 cores) and the whole system hangs, neither apache is responding to any ...