Disk storage is generally the permanent data storage of a server.

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143 views

How to identify EBS volumes vs local volumes on running EC2 instance

On a running EC2 instance, how do I identify EBS volumes and local disks ? I would like to identify them from shell. fdisk, lsblk is not helping to pinpoint the EBS volumes only. Lets say I have ...
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25 views

Any ideas out there as to why a Dynamic Disk in Windows shows “failed redundancy” every time the machine is rebooted?

The unit in question has a software RAID handled by Windows. I'm not a big fan of software RAIDs, but the owner of the unit insists it is setup that way. Every time the unit is powered off, either ...
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283 views

Install Winsat on server 2012? Windows System Assesment Tool

I use winsat disk to see my disk read / write speed windows 8 and it works great: cmd : winsat disk -drive c Can this be used on windows server 2012?
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2answers
121 views

When to use hot-spare?

On my newly purchased HP MDS600 with 70x 4TB Nearline SAS disks, I now need to configure the disks, and I want raidz2, so the raid sizes follows 2^n+2. The options I therefore have are 7 raid sets ...
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2answers
41 views

Migrate unix-system to hardware RAID-5 possible?

At the moment, I have a Intel SR2500 with 5 disks running at home. 4 of the disks aren't used at the moment due to maintenance-reasons. Because it's an expeiment-laboratory-machine where I can try ...
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1answer
37 views

Getting ssd, should i keep the ssd cache drive

We are going to install sdd's as main hdd in all of our pc's. However, some of them already have an ssd drive that is beeing used as a cache drive. Should be keep this chace ssd? It was my though ...
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3answers
162 views

How reliable are current 2 TByte consumer grade disk drives?

Most cheap SATA disk drives are rated with "1 non-recoverable read error per 10^14 bits read". What does this mean? 10^14 bits is just 12.5 TByte. If I have a full 2 TByte disk and I copy it to a ...
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1answer
152 views

How to correctly move application data to an attached disk on an Azure Linux VM

I have a Linux VM on Azure that originally came with a 30G OS disk. As I had an application that had accumulated a lot of data, I attached a new disk through the Azure Dashboard and here is how it ...
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2answers
199 views

Selecting a boot drive for Hyper-V 2012 server - is a boot drive performance important?

I'm setting up a new Hyper-V 2012 server dedicated to virtualization and I'm trying to determine the best choice for the boot drive. I have 2x250gb SSD drives i'm considering for storage pools for ...
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1answer
81 views

Windows 2012 server wrong iscsi disk size

I have Windows Server 2012 and iSCSI storage. On the storage, I created a RAID1 array out of two 2TB disks and connected it over iSCSI to the server. But the server sees the connected device as ...
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1answer
194 views

upgrade/reinstall vmware vsan from beta

Being a VSAN beta tester I decided to upgrade to GA version as VMWare suggests for production sites. They say, it is not possible/supported to upgrade from beta to GA version, and I did not upgrade, ...
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69 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 ...
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1answer
267 views

Abnormal CPU usage during Disk Write Operations

I have a decent CentOS 6.5 dedicated host (CentOS 6.5/E3-1230 3.2Ghz Quad Core + HT/16GB/Software Raid 1 SATA II/WD2503ABYX/ext4) with the default CentOS kernel and "elevator=deadline" in grub. I/O ...
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111 views

Debian mail server's Maildir folder with too many files causing disk I/O to go on high load

I have a Debian mail server running Postfix, Courier and Maildir, with disks on EXT3 filesystem. I have noticed that when I use my webmail application (Squirrelmail, in this case). It gets some kind ...
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1answer
623 views

Extend a striped volume in Windows Server 2008 R2

Can striped volumes in Windows Server 2008 R2 be extended? I have searched here on ServerFault and also on Google for an answer to this, and I can't seem to find an answer. Even the commercial tools ...
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1answer
184 views

how to merge 2 controller (6 Bays each) in HP DL370 G6

I am having a server DL370 G6 as seen in the image below, and I want to install Windows Server 2008 E. we are using it for camera recording. Each slot has 6 2 TB hard disks. I want to merge both as ...
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2answers
37 views

CentOS remount a used disk [closed]

I have a used disk full of video files which is 1TB in size and is mounted on /usr/local/nginx/html. I want to remount it on /disk1 for naming purposes. If I remount it would the files still be ...
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1answer
43 views

Windows 2008R2 reporting low disk space - 500mb [closed]

I have a server reporting very critically low diskspace. I have three 1TB drives with installed and I would appreciate some advice on remedying this issue. I am considering using a Spanned Disk as ...
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1answer
2k views

XenServer 6.2: how to use a partition on install disk as SR?

I'm setting up an old spare server with XenServer 6.2 to run some test VMs and to get some experience on XenServer itself (we're used to our own linux+xen setup and to the usual VMware suspects). ...
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0answers
545 views

ext4 root filesystem corruption under XenServer 6.2 DomU

We're with a problem with filesystem corruption in guest machines in a XenServer 6.2 It only happens in Linux Machines. Randomly the filesystem remounts as read-only and them corruption starts on the ...
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1answer
128 views

Format and partition device-mapper in LVM

I have a disk on a server: /dev/VolGroup00/LogVol02 that is about 5TB. I would like to format and partition it to make 2 500GB mount points. It doesn't even have to be in LVM. How can I take this ...
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61 views

SATA III HDDs not working on SATA II RAID HBA

I would appreciate any help with this. We have Sunfire x4275 disk server with Sun StorageTek SAS RAID HBA and trying to get working these disks: WD RE 4TB Enterprise SATA III (WD4000FYYZ) Sun RAID ...
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102 views

Virtual Allocation Unreasonably High

Just upgraded our pool to Xenserver 6.2 and installed a brand new host, also with Xenserver 6.2. Was excited about the new features since Xenserver was fully open-sources (over-allocate ram, ha live ...
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1answer
118 views

Disk size addressable by the OS

I have a 3ware 9550SXU-12 storage controller and 750G disks connected to it. The disks are configured as single units (not JBOD). I've been running some performance tests, mainly to see the impact of ...
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1answer
143 views

High disk overloads slows the server

My server get very slow as soon at my gstat output shows high amount of busy%. Look at the gstat results: Here is the top -m io -o total and the gstat commands running at the same time: How ...
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58 views

Rotating external disks while keeping the same drive letter in Windows 2003

On a Windows 2003 R2 server, two external USB disks are being used for backup purposes, one at time. The units are identical (same manufacturer and model) and retain the same volume name (although I ...
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2answers
3k views

How to check the current queue depth value?

I have an OEL server connected via fibre to a NetApp SAN. How can I view the queue depth as the OS sees it? Output from lspci: 05:00.0 Fibre Channel: QLogic Corp. ISP2532-based 8Gb Fibre Channel ...
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1answer
28 views

Editing fstab for a new drive that will contain subdirectories on other disks

Currently the disks on my box look like this: Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup00-LogVol00 30G 28G 174M 100% / ...
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4answers
931 views

Process running slow with logging in Dell R720 server

We bought a Dell R720 server and installed CentOS 6.3 on it. We have another older Dell server which also has CentOS 6.3 installed in it. When we ran a simple benchmark for disk performance the older ...
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55 views

Windows 2008 Performance Monitor - Disk Performance

We have a Windows 2008 R2 server with SQL installed. We are trying to measure if the disk performance is causing any bottle necks. I've found many suggestions regarding which monitors to use, but am ...
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1answer
2k views

CentOS6 and long Wait IO time on jbd2/dm-0-8

Linux box running CentOS 6.5 and 2.6.32-431.3.1.el6.i686 kernel recently got CPU spikes up to 99% causing by Wait IO. Executing while true; do date; ps auxf | awk '{if($8=="D") print $0;}'; sleep 1; ...
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26 views

fsutil does not give me any output

I have an exchange 2007 server (win2003) over a vmware cluster. I want see the blocksize of some disks. But looks that fsutil does not work properly because it does not give me any output. ...
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1answer
93 views

How to fix geometry of two identical disks?

I have two identical HDD. First has geometry 3876021/16/63 and second has geometry 3876018/16/63. First disk's capacity is 50% already. I want to add second disk to mirror (first disk is master). How ...
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1answer
155 views

mdadm constant disk i/o

I have an mdadm array which has constant disk i/o. I know it's the array bc my server shows which specific drives have activity. According to iotop there's a constant disk write of 3-6 Mbps, however, ...
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433 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 ...
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2answers
171 views

Can a 7200RPM drive transfer speed at a full 6 Gbit/s?

Many vendors sell 4GB SATA and Nearline SAS drives which spin at 7200RPM. The vendors will advertise a 6 Gbit/s interface with no mention of actual data transfer speed. I've had conversations with ...
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2k views

Why are “sectors per track” still relevant on a modern OS with modern drives?

I am building out a new machine and the raid controller is asking me for sectors per track. I haven't had to deal with disk math in a long time (1998?), and I can't find anything that pertains to ...
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73 views

Why is file rewrite slower?

on Linux, using various benchmark tools (bonnie++, iozone, etc) on ext4 (but i guess it's the same on other FS), rewrite is always slower than write to new files. For example, using bonnie++, with ...
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387 views

Why does dd show slow disk speed first time?

I'm checking the disk speed of a hdd on CentOS 6 using dd command. The setup is a DRBD setup - with this server being primary. To ensure that I get correct values, I execute the dd command 3 times ...
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99 views

VDA Disk Fail / Virtual machine corrupt

I am hoping I can get some help here. I have a server that is hosted with a very large server hosting company and today the server became unavailable. On contacting the company they said that the ...
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2answers
730 views

Importance of disk alignment for Windows Server 2012

I saw article about Disk alignment here and also here.Also there where some references that windows server 2003 has some problem with disk alignment. After reading article I am confused whether we ...
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1answer
241 views

Finding root cause of 99.99% iowait with 0% SWAPON

Users and DBAs are complaining that "Oracle is slow" on our OEL servers. The only thing I have found from the OS standpoint is that there are some strange IOWAIT stats from iotop. Output from iotop: ...
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1answer
161 views

SSD life span depends on rewrite [closed]

I want to know the life span of a SSD. Some where i read that If there is more write on the SSD then it will have less life. Is it true? What are the factors mainly effecting SSD life span. Please ...
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108 views

Moving partitions to the root partition

I am currently stuck with a restrictive partitioning scheme that makes my partitions fill up. It looks like this: /dev/sda7 870G 315G 511G 39% / /dev/sda6 2.0G 271M 1.6G ...
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256 views

High Disk I/O on server reboot

A CentOS 5.8 machine has high Disk I/O upon starting up. The processes taking up disk IO are kmirrord, kjournald and pdflush. I have done the performed the following: 1) Mounted the filesystem with ...
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vmware thin disk usage powercli

I want to ask a question about thin provisioning. get-vm commandlet can easly give us real space used by a vm totally. Assume that you have a virtual machine which has more than one thin disk. If ...
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1answer
195 views

vmware Converter issue with 'System Reserved'

Working on converting a Windows Server 2008 R2 machine from physical to virtual. Each time I run the converter it fails at 98%. I'm pretty sure the issue is occurring because vmware doesn't know what ...
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2answers
3k views

Relation between disk IOPS and sar tps

I'm trying to estimate IOPS requirements of my application running on 32-bit CentOS 6.2. I started to take some measurement on a machine with SATA disks and I'm quite confused of difference between ...
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1answer
191 views

FreeBSD 9.2 shows SATA3 drives as SATA2

I'm running FreeBSD 9.2 on an Intel S2600GZ server board with 4 Intel SSDs. Both the server board as well as the disks are SATA3 capable. However, FreeBSD seems to think they are SATA2. Nowhere in ...
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2answers
300 views

How do I figure out which drive is failing?

How do I relate this information with which physical drive is failing? It's a debian kernel. Nov 21 18:06:00 IHPAC kernel: [594026.608042] ata5.00: status: { DRDY } Nov 21 18:06:00 IHPAC kernel: ...