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

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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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63 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
106 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
69 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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42 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
2k 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
21 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
691 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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2answers
47 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
719 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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20 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
85 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
107 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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3answers
124 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
149 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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2answers
1k 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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1answer
62 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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2answers
207 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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0answers
80 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
394 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
159 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
118 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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3answers
98 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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2answers
176 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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0answers
54 views

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
143 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
1k 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 ...
3
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1answer
156 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
204 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: ...
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2answers
3k views

CentOS thinks Disk is busy, can't mount or fsck

I'm a longtime user, and first time question submitter. I've spent a full day searching this and many other sites for a solution, but I must resort to requesting assistance to resolve my situation. ...
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2answers
46 views

How to limit disk performance?

I am load-testing a web application and studying the impact of some config tweaks (related to disk i/o) on the overall app performance, i.e. the amount of users that can be handled simultaneously. ...
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98 views

Linux not buffering block I/O when the device is not “in use” (i.e. mounted)

I am installing new server and I've found an interesting issue. The server is running Fedora 19 (3.11.7-200.fc19.x86_64 kernel) and is supposed to host a few KVM/Qemu virtual servers (mail server, ...
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2answers
533 views

Increase/refresh the size of the FreeBSD's main partition

I am using VirtualBox and have my FreeBSD mounted on a virtual drive, which recently ran out of space (10 GB) so I have increased the Virtual Drive size up to the 15 GB - started my FreeBSD and its ...
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1answer
837 views

Slow Write Speed on ESXi host

I have an ESXi 5.0 free host with an internal datastore of 7.2K 5 disk RAID 5 using a PERC 710 mini RAID controller in a Dell Poweredge R620 Server with 32GB Ram and a 12 Core Xeon. I seem to get ...
3
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1answer
6k views

what is acceptable datastore latency on VMware ESXi host?

Looking at our performance figures on our existing VMware ESXi 4.1 host at the Datastore/Real-time performance data Write Latency Avg 14 ms Max 41 ms Read Latency Avg 4.5 ms Max 12 ms People ...
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4answers
917 views

Disk performance below expectations

this is a follow-up to a previous question that I asked (Two servers with inconsistent disk speed). I have a PowerEdge R510 server with a PERC H700 integrated RAID controller (call this Server B) ...
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1answer
1k views

Upgrading a PERC h310 to a PERC H710 mini RAID controller on a Dell R620

I have an ESXi 5.0 Free license host using an internal Datastore (RAID 5, 5 Disk) that was configured with a Dell PERC h310 RAID controller. The disk performance was very poor, so I upgraded to the ...
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3answers
369 views

How to keep subtree removal (`rm -rf`) from starving other processes for Disk I/O?

We have a very large (multi-GB) Nginx cache directory for a busy site, which we occasionally need to clear all at once. I've solved this in the past by moving the cache folder to a new path, making a ...
0
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1answer
110 views

Maximixing performance for disk usage queries in linux using du -s or df while maintaining accuracy?

I'm running a script to find out the disk usage on a wide range range of VPS (size ranging from less than 1 GB of usage to over 200 GB of usage)... I'm trying to maintain performance (EG: no extra ...
2
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1answer
74 views

Understanding %DiskTime in Perfmon

I have a server that's been jumping around 100-700 %DiskTime for the past few days. I understand this indicates an I/O bottleneck -- but what do I do from here? What do I need to check or change in ...
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0answers
35 views

How to rearange disks with a new SSD

Here is the problem: I have a Debian server with only 4 disk bays. At the moment there are 4 x 1GB SATA disks in software RAID 10. I'd like to swap one of the SATAs with a 1GB SSD disk and move the OS ...
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0answers
15 views

No disk space on / (Debian Jessie) [duplicate]

I have a problem with disk space on my dedicated server. I have no disk space available on partition / root@server1:/# df -h Filesystem Size Used Avail Use% Mounted on /dev/root 96G ...
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2answers
192 views

Disk Cached IO very slow

I have two boxes with exactly same hardware configuration. Both having RAID0 (created using mdadm) over SATA disks. But I am getting different cached reads while testing using hdparm command. $ ...
0
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0answers
70 views

Two servers with inconsistent disk speed

I have two servers of identical spec (bought at the same time), except for the drive configuration: Server A: C: and D: drives are partitions on the same 2 disk RAID 1 E: is a 2 disk RAID 0 ...
0
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1answer
40 views

Are these disk errors cause for concern?

Every day I get an email from the logwatch program on our company web server. The server is running CentOS 6 and uses Apache, MySQL and PHP to serve web pages. It is a dedicated piece of hardware (not ...
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1answer
102 views

Debian 7 - Disk lag when copying files [closed]

I'm hosting multiple game servers on a machine with Debian 7 and after a game server is created, a new game folder is extracted with the game files on it, which involves copying around 2-4 GB, and ...
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0answers
22 views

WS2003 network drive gets deactivated after restart

windows server 2003 OS runs sql backups regularly and periodically i have to restart once in a while. when the restart takes place the network drive(H) becomes deactivated which i do not understand ...
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2answers
262 views

Is it safe to place write-intensive partitions on an SSD (in an SSD+HDD system)?

I'm setting up a (sort of) powerful workstation for SW development work on Linux. It's a Xeon system with multiple cores, 32GB memory, a large HDD and a 120 GB SSD (Samsung MZ7WD120HAFV a.k.a. ...
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1answer
1k views

KVM + NFS poor disk performance

Situation: We have an Ubuntu server that hosts three VMs using KVM. All guests as well as the host need to access the same files in a certain subfolder of /var . Thus, the subfolder is exported via ...
1
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1answer
127 views

Hyper-V pass-trough disks incorrectly identified as SSDs on guest

I have setup a Windows Server 2012 Essentials guest to run on a Hyper-V host (Windows Server 2012). A physical HDD (spinning rust) is setup as pass-through to the guest, but it's incorrectly ...