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

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Physical disks comprising a Volume in RHEL

How do I list the physical disks and associated information (disk model, size, etc.) for all disks that are members of a physical volume in RHEL? For example, if I do I "pvscan", I get the following ...
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1answer
68 views

3Ware 9500S - Do spare disks spin when not used

Does anybody knows if spare disks connected to a 3Ware 9500s controller will be spinning although not being used? This will wear unnecessarily the disk, possibly spinning for years before a unit gets ...
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1answer
147 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 ...
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3answers
2k views

PostgreSQL slow commit performance

We are having some problems with a PostgreSQL configuration. After some benchmarks I found out that very simple queries are taking a relatively long time, upon furter inspection it appears that the ...
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2answers
50 views

Are RAID 1 disks usable transparently?

I was wondering if RAID 1 disks are usable straight away, without the RAID controller. Possible?
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1answer
221 views

Strange IO issue with Ubuntu 12.04

I have a very strange IO issue with Ubuntu 12.04 and MySQL. Currently the machine is only a replicated slave with an occasional read query hitting it. The disk utilization spikes randomly and ...
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3answers
1k views

Clear the fault LED on an IBM x3650 M4 after accidental disk insertion and removal?

The server had a disk added, and then the operator realized they put the disk in the wrong server, so they pulled it out again. No harm done, the server is running and the disk was never actually ...
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2answers
480 views

df vs du. Is my disk really full?

Strange problem... Why i have full / partition used, but it's not really used? Fast info: xwing ~ # df -h Filesystem Size Used Avail Use% Mounted on rootfs 16G 15G 75M 100% / ...
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4answers
670 views

root full Linux. No free blocks

df -h reports the '/' partition to be 100% full. While running du -hs * on each directory of this partition shows there is still lot of space. tune2efs which reports just one block to be free. Ran ...
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1answer
2k views

Why is this SSD drive failing with bad sectors, and was it predictable?

Note: this question was previously closed as off-topic. You can read the discussion. My reasons for asking it here are: This drive is in an offline content cache server for schools in rural Zambia. ...
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1answer
1k 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 ...
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2answers
402 views

understanding disk space on ec2 freebsd instance

So I probably lack some basic fundamental understanding when it comes to unix drives. On amazon-ec2, I just created an instance where I specified the root device to be 30 GB. If I goto volumes I see ...
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2answers
43 views

Which is more reliable? Writing an unchanged configuration to disk or leaving existing configuration alone? [closed]

I noticed that our code is writing our configuration files to disk every time the program exits, even if the configuration has not been altered. It takes less than 0.25 seconds to write out all the ...
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1answer
46 views

Should getfacl be running constantly and is it normal for it to be using greater than 90% of available disk I/O?

I've recently been getting alerts from our server monitoring software about greater than 90% disk I/O utilisation. I installed iotop and there are three instances of the following process showing up ...
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6answers
315 views

Failure of virtual SCSI device, Server 2012 Hyper-V - EventId 129 - Reset to device, \DeviceRaidPort0, was issued

Been running Server 2012 Hyper-V for a few months now quite reliably. That was until the following event started: EventId 129 - Reset to device, \DeviceRaidPort0, was issued When this occurs all ...
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4answers
1k views

Re-sizing disk partition linux/vm

I VM Player running a linux guest and I was wanting to know how do I expand the disk? In the VM player I gave more disk space but I am not sure how to mount/expand/connect the new disk space to the ...
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1answer
627 views

SMART and exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0 [closed]

looking at the logs I see several errors. The smart status is PASSED, but even if It is verbose It isn't clear what is going on. Should the disk be replaced? Attached dmesg and smart logs # dmesg ...
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2answers
797 views

Output of /proc/diskstats in ubuntu

can anybody tell me about 11th field in /proc/diskstats? The documentation says that it is weighted # of milliseconds spent doing I/Os. Is it like # of milliseconds spent for DiskIO in a second? I ...
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1answer
52 views

How to dump data written to disk

Question : How to dump data (byte-stream) written from an application to the filesystem ? (something like tcpdump but for IO/file). Ideally it should be able to "attach" and dump the stream while it ...
0
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1answer
279 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 ...
3
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1answer
1k views

Find current IOPS usage of EBS volume from my application on AWS EC2

I am relatively new to AWS and disk performance. I am trying to figure out how much provisioned IOPS does my application need to perform well. Currently My PHP and MySQL application is hosted on EC2 ...
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2answers
68 views

Formatting a new disk partition

I just added a new raid1 volume to my Windows 2008 server. The raid sync has just completed so I want to format it. I got this message: That disk will be used just for storage, no need to boot ...
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1answer
65 views

Does regularly running smartctl negatively affect disks?

I have many servers in different data centers. Lately I had some disk failures that I probably could've detected beforehand, so I started automatically running smartctl -t periodically on each disk. ...
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1answer
336 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 ...
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1answer
1k views

HP Proliant ML350 G5 E200i Hard Disk get amber light after firmware Update

I have an HP ProLiant ML 350 G5 with E200i Controler running Windows Server 2008 R2 x64 It have four disks drives models DG072A9BB7 firmware HPD0, with two logical drives C: and D: booth with raid ...
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2answers
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Why do I get “No space left on device” when running mail

First of all I've checked these two solutions on serverfault but I'm still having issues. Here's my problem: root@myserver:/# mail /tmp: No space left on device Firstly I checked the filesystem ...
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6answers
18k views

How can I successfully mount an 8-bit SCSI drive on a modern computer?

I have a number of internal 8-bit SCSI-1 drives that I'd like to archive for historical purposes. These are all the old NeXT Cubes and NeXTStations (monochrome and color) that were used by id ...
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3answers
100 views

Simple way to extend server disk capacities

What's the least cumbersome way to extend existing server's storage capabilities? I have a SuperMicro custom server and a Dell PowerEdge 2950 and I would like to extend their storage with budget hard ...
2
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3answers
170 views

How do I determine the number of seeks performed on Linux?

I have two programs that write to my servers disk. One I wrote, it does linear writes, it's writing data quickly. Another I'm benchmarking, it's writing data at a 3rd of the speed. It doesn't do much ...
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1answer
410 views

IOPS write increased, Disk write latency decreased, Avg req size decreased - Page load speed decreased

I have noticed decrease in server performance (page load speed become lower), then I went to investigate and have found in munin graphs (which tracks server's resources) that there was big changes on ...
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2answers
75 views

Historical data / logs on what RAM and disk storage used to be in Linux? [closed]

Is there any historical data / logs in my VPS that can show what the RAM and disk storage used to be? My hosting provider reduced my RAM and disk storage from 1.5GB and 150GB to 1GB and 100GB ...
27
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2answers
5k views

Why are enterprise SAS disk enclosures seemingly so expensive?

I will begin by stating that I do not believe this is a duplicate of Why is business-class storage so expensive?. My question is specifically about SAS drive enclosures, and justifying their expense. ...
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0answers
460 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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1answer
324 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 ...
2
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3answers
531 views

Disk write speed much slower than read speed

I have a VPS server (WiredTree), running CentOS. After experiencing some performance issues I created a simple benchmark for disk read/write speed using the following script: echo Write to disk dd ...
2
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0answers
202 views

Is retriving data on SAN is fast versus storage on local disk? [closed]

I work in a company, where I was lately having discussion with folks from system engineering and the security team on topic of fast data access in terms of (IOs) performed over the network (SAN) ...
3
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2answers
5k views

Windows Server 2008 R2 reports full disk, but files do not add up

I have a web server running Windows Server 2008 R2 Enterprise. It's C:\ drive is 100 GB in size. We started getting errors from IIS and discovered that the C:\ drive, surprisingly so, was reported to ...
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1answer
151 views

Merge Unallocated Space BEFORE partition (W2K8R2)

My Windows Server 2008 R2 Disk Management looks as follows: 100 GB 100GB [Unallocated][(C:\)] X Y I accidentally installed Windows into the second partition (Y) ...
3
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1answer
4k views

Proliant server will not accept new hard disks in RAID 1+0?

I have a HP ProLiant DL380 G5, I have two logical drives configured with RAID. I have one logical drive RAID 1+0 with two 72 gb 10k sas 1 port spare no 376597-001. I had one hard disk fail and ...
3
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2answers
2k views

Issues with Server 2012 using DFSR running on Hyper-V 2012

We have a number of Server 2012 systems, all of which run virtualised on Hyper-V 2012 server. We are having problems with two such virtual instances, both of which are used as file servers, whereby ...
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2answers
255 views

SSD suddenly full

Today the hard drive of our server was suddenly full. The disk usage always stayed around 50 % in the weeks and months before (old data is regularly expunged from the server). I deleted 10 GB of ...
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2answers
637 views

disk space keeps filling up on EC2 instance with no apperent files/directories

How come os shows 6.5G used but I see only 3.6G in files/directories? Running as root on an Amazon Linux AMI (seems like Centos), lots of free memory available, no swapping going on, no apparent file ...
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2answers
504 views

Safely resizing partitions in CentOS 6

I have deployed two VMs on VMware with CentOS 6.3 Net Install. It has automatically created some partitions. It has created two major partition for root and home. root partition has size of 50GB and ...
0
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1answer
132 views

Using second eSATA port for second DAS

I have a server with a HP M60 12TB disk array attached. The server and disk array both have 2 eSATA ports in order to connect 2 cables to double the throughput, but I am wondering if it is possible to ...
2
votes
2answers
105 views

Is it reasonable that a random disk seek & read costs ~16ms?

I am frustrated about the latency of random reading from a non-ssd disk. Based on results from following test program, it speeds ~16 ms for a random read of just 512 bytes without help of os cache. I ...
0
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1answer
46 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 ...
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3answers
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Ubuntu webserver is out of space

Apparently, I was using xvda1 disk which is out of space. How do I change the /etc/fstab so that I can make my xvda2 for top level, and xvda1 as additional resource? It's an EC2 instance: root@~# ...
2
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1answer
417 views

Mount a partition to two mount points

I have a partition called sda4. And I want to store the mysql data and xml files on that partition because the partition which mysql and domain are installed has little space. So I'm planning to ...
0
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1answer
1k views

resize root partition without using live cd and lvm [duplicate]

Possible Duplicate: Do partitions needed to be unmounted when resizing a partition? I want to know if it is possible to resize an existing root partition without using live cd. The server ...
0
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2answers
481 views

Disk Activity Alert Windows SBS 2003 on Dell PowerEdge 830 with Raid

Background: I have a Dell PowerEdge 830 Server running Windows SB Server 2003. It has 4gbs of RAM and a ATA CERC SATA 6CH controller with 3 160gb drives in a Raid 5 configuration. The Problem I am ...