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

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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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148 views

Is WinSAT reliable to test the speed of my iSCSI, Fibre SAN, under bare metal or Virtualized?

I discovered the following command in this whitepaper: WinSat disk -read -ran -ransize 4096 -drive c Is it reliable to use against a SAN, or iSCSI drive? I would like to compare the output of ...
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1answer
2k 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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1answer
52 views

Why the I/O rate difference between an LV and PV?

I have been doing some benchmarks reading with dd from both the LVM device and the PV device and I got some unexpected results: $ sync ; echo 3 > /proc/sys/vm/drop_caches; dd bs=1M count=1024 ...
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1answer
56 views

mount hardware raid disk 1 with one disk and no hardware raid controler

I have one of two raid disk (from LSI raid card) There is a way to mount it in a PC and access to the disk without the raid card? Maybe mounting or skipping the first bytes!? Thanks in advance. ...
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1answer
128 views

Linux RAID: Replacing Failed Drive…permanantly

Okay, odd question here. I have a server with RAID 5. A drive failed, in a really physically in a really odd way. On the machine it boots and is seen by the BIOS but...no partition can be seen on the ...
1
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1answer
332 views

How do I measure and compare disk performance of my Hyper-V Windows VM?

I'm not sure whether this sounds stupid or lazy, but I'm really not sure. I have a problem with the performance of a VM setup (2008R2-64bit Hyper-V running a 2003R2-32bit Windows server) and I'd like ...
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1answer
2k views

How to mount encrypted volume at login (Ubuntu 12.04, pam_mount)

I'm trying to get pam_mount working on Ubuntu 12.04. I have /dev/sda1 (encrypted partition) with /dev/dm-1 (ext4 formatted) inside it. Should ~/.pam_mount.conf.xml be trying to mount /dev/sda1 or ...
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1answer
99 views

Verify server performance

I'm looking for a quick and SIMPLE way to verify that new servers are performing as expected. The most important metric is disk performance, second is network performance. I’m trying to prevent ...
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1answer
102 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). ...
0
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1answer
41 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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1answer
813 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 ...
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 ...
0
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1answer
349 views

How to change disk space quota on Plesk 11

I have recently migrated a few domains on a Plesk 9 server to a new Plesk 11 server. The old Plesk 9 server had just 5GB of disk space, so I put disk space quotas on the domains hosted on it. The ...
0
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1answer
35 views

RAID1 Disk blocks don't match but no errors

So I have couple of disks configured with RAID1. The device is: md2 : active raid1 sda5[0] sdb3[1] 274324348 blocks super 1.1 [2/2] [UU] bitmap: 1/1 pages [64KB], 65536KB chunk Though when I ...
0
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1answer
113 views

Why can't i recover a RAID1 disk which apparently has no errors

For several years now we run a software RAID1 on a old Gentoo box with a custom Linux 2.6.31. The RAID consists of 2 harddisk with 4 partitions each. In the last years it happend about 3-4 times that ...
0
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1answer
843 views

MegaCLI causes drive “Other Error”

I am having an issue where running "megalci -PDList -aAll" will cause an Other Error to be logged for 2 of the 6 discs in a pair of servers I have. Here is that again in more detail. I have two ...
0
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1answer
173 views

MySQL Corrupt Table - No Space left - Index File too big

I noticed that one of my servers was running out of disk space, due to heavy MySQL usage. I stopped everything using the database, freed up some space and restarted mysqld. Now, I checked my table ...
0
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1answer
223 views

MySQL Extremely High Disk Activity (Read Operations)

I have 1GB Linode VPS with a standard LAMP stack. Apache is tuned fine but for some reason MySQL's disk usage is high. This is causing really slow site load times. RAM and CPU usage are fine. Can ...
0
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1answer
43 views

Does soft link affects xml parsing and database process

I have a php code that does an xml parsing and inserts data into the mysql database. The code can process one xml file in an average of 18 minutes. Since I will be having lots of xml files and ...
2
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0answers
38 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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137 views

Convert single O/S disk to RAID 1 - Ubuntu 12.04 LTS

I have a server running Ubuntu 12.04 LTS with only a single drive. There are 2 more empty hot swap bays in the chassis. I want to add a little redundancy by adding a RAID 1 to the system. The ...
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212 views

iscsi disk over 2 TB cant initialized

I have a windows server 2012 x64. I'm free to connect and initialize the disks smaller than 2 TB. I can connect more than 2 TB disk but I can't initialize it? Windows can not determine its size, the ...
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36 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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24 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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49 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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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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33 views

partitioning a 2x larger disk to house zfs migration

so there are numerous sites taking about using vdevs made from disk partitions like this in order to reorder vdevs of different sizes. however, i have the following physical disks: Disk /dev/sda: ...
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112 views

Resize a RAID 5 Partition

I'm moving my VG to a RAID, i have 3 disk 600GB, the VG is in the partition /dev/sdc2 /dev/sdc1 1G type linux <-- Boot partition /dev/sdc2 599G type Linux LVM One disk have the VG and with the ...
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43 views

Rebalance pooled disks

Using mhddfs multiple drives were pooled to form a big virtual mountpoint. Now using the mlimit option unbalancing is prevented, but the drives are already in an unbalanced state. Is there a script ...
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203 views

Cannot initialize disk in PowerShell : Initialize-Disk throws “The disk has already been initialized”

I'm trying to change the flash drive's partition style to GPT using PowerShell, but the cmdlet throws "The disk has already been initialized" (even though I've cleaned the drive): PS ...
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378 views

udisks-daemon eating up all my memory

I'm operating a little storage server on debian, over the past months I've noticed the process udisks-daemon eating up almost all available memory. Is this just really aggressive caching or a memory ...
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773 views

mdadm raid1, [1/2] disks failed, safe to reboot?

I am seeing the following under /proc/mdstat Personalities : [raid1] md1 : active raid1 sda2[0](F) sdb2[1] 976554876 blocks super 1.1 [2/1] [_U] bitmap: 4/8 pages [16KB], 65536KB chunk md0 : active ...
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19 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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23 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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93 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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23 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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23 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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12 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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80 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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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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64 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 ...
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0answers
88 views

Why Wmi info for disk size is wrong?

i am expecting a very curious problem. In a script collecting disk infos on a list of W2008 servers, i realize that, for some servers, the Wmi info for the disk size is wrong. My Powershell command: ...
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33 views

data writing mechanism in SSD and impact of file change

I wanted to ask this question basically because of write endurance of SSDs. How is data written in SSDs (in MLC type). Say a file of 2 Kb is there and if a block size is 1 Kb, then first 1 Kb of file ...
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51 views

High Write I/O “Pulsing” with dtrace errors

We are experiencing "pulsing" writes to disk (from 1 writes out/sec pulsing up to 142+ writes out/sec) around every 10 seconds. See this example image: ...
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75 views

What causes Citrix server system-disk write-queue extension

We have 7x 4-core quad-cpu (i.e. 16 vCPU's); 7x 2-core quad-cpu (i.e. 8 vCPU's); 4x dual-core (i.e. 2 CPU's) All running Citrix Presentation Server for Windows v4.5 on Windows Server 2003 Citrix ...
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130 views

Xymon monitoring Filesystem of ESXi fails

I have a Xymon server which monitors my ESXi servers. Now if i try to check the disk of my ESXi, it fails in the xymoncmd: root@xymontest3:/usr/lib/xymon/server/bin# ./xymoncmd ../ext/vmtest_esxi.sh ...
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122 views

CentOS Volume Group remount after reboot

Using centos 6.2x86_64 /dev/sda is primary disk /dev/sdb is secondary disk. The volume group size of /dev/sda was not enough so i increased the size of volume group using vgextend command. It was ...
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204 views

File-level SSD cache

My windows development environment gets pretty slow sometimes, it's a huge code base. I was thinking of speeding this up by using an SSD, but I want a way to do it while not requiring myself to carry ...
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stop late fetch newly written files

The question also posted here I m running a server which is serving some image files. Now these image files are checked if available on disk and if they are not they are processed from the original ...