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

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2
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1answer
292 views

How to deal with bad sectors?

Bad sectors will eventually occur, but how should I deal with them? If a bad sector occurs, does that mean that the data in that sector is irrecoverably lost, and I should restore it from backup? Is ...
-1
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1answer
149 views

Are disk partition labels or UUIDS stored in the partition area itself or in some other area of the hard disk? [duplicate]

Are disk partition labels or UUIDS stored in the partition area itself or in some other area of the hard disk? e.g If the dd command is used is used to copy the raw partition image from one partition ...
2
votes
1answer
114 views

Recover data after lvreduce on “/”

I accidentally ran lvreduce on / instead of "/home" on a RHEL 5.9 system that unfortunately had a lot of code that was not backed up, and the system will not boot now obviously. What is the best way ...
2
votes
2answers
7k views

How to get more I/O performance from Citrix XenServer?

I have a Citrix XenServer 6.1 installed on a HP Server (1x Intel Xeon E5630 @ 2.53GHz (4 cores, 8 threads, RAM: 752MB for dom0 and 55286MB for the guests). The server has 2 scsi mirrored disks and is ...
5
votes
2answers
1k views

HP 4TB SATA Midline in D2600 - what disk make is HP using & why WD RE4 don't work?

Does anyone know what make of disk HP are using in their 4TB SATA Midline & why WD RE4 don't work? So we use D2600 crates with HP 2TB disks, and just buy WD2003FYYS - pop them in old HP caddies. ...
0
votes
1answer
125 views

Huge disk write speed difference between two different servers

I have two servers, with similar disks. The first server has 4x300GB Seagate Cheetah 15K.5 model nº ST3300655SS 3.5'' RAID 10. The second 4x300GB Seagate Savvio 15K.3 model nº ST9300653SS 2.5'' RAID ...
1
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3answers
828 views

mkdir: cannot create directory `b': Disk quota exceeded

When i try to create a file or dir on my Ubuntu 12.04.2 LTS vserver i get a mkdir: cannot create directory b: Disk quota exceeded. But: Filesystem Size Used Avail Use% Mounted on /dev/simfs ...
1
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3answers
654 views

SSD read errors; should I be worried?

An SSD just over a month old is producing read errors in my syslog whenever rsync backs it up: [276877.360221] ata1.00: exception Emask 0x0 SAct 0x1 SErr 0x0 action 0x0 [276877.360226] ata1.00: ...
0
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2answers
236 views

Accessing the disk under Task Scheduler

I'm running a couple of console applications using task scheduler. These are applications that perform little backoffice tasks and run as C# console applications. The applications themselves run ...
2
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1answer
2k views

Why does a mysql query, that requires copying to tmp table, randomly sometimes consume 100% CPU during several seconds?

I have some crazy SQL queries in my PHP scripts which badly need some optimization. However the question is NOT about how to optimize them. These queries have a lot of "join"s and some bizarre "order ...
-1
votes
1answer
106 views

Why disk manufacturers use 1000 instead of 1024 as base unit measure? [closed]

Today is considered normal to use powers of 1000 instead of 1024(SI x base2) on disks capacity(hd, ssh, usb...), even with our operating systems using base2 measures(except Snow Leopard). This makes ...
0
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1answer
161 views

ram disk mirroring part of physical disk

What I would like to do/have is: Some kind of application/driver that creates a RAM drive/partition that is actually assigned a drive letter (eg. D:). This drive letter should be based on/mirroring a ...
1
vote
0answers
290 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 ...
1
vote
2answers
262 views

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 ...
1
vote
1answer
70 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 ...
1
vote
2answers
188 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 ...
5
votes
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 ...
0
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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?
4
votes
1answer
233 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 ...
1
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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 ...
12
votes
2answers
505 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% / ...
9
votes
4answers
812 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 ...
11
votes
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. ...
0
votes
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 ...
2
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2answers
471 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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votes
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 ...
0
votes
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 ...
1
vote
6answers
364 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 ...
1
vote
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 ...
-3
votes
1answer
761 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 ...
0
votes
2answers
881 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 ...
2
votes
1answer
55 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
votes
1answer
324 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
votes
1answer
2k 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 ...
1
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2answers
71 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 ...
0
votes
1answer
69 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. ...
1
vote
1answer
397 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 ...
1
vote
1answer
2k 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 ...
1
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2answers
1k views

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 ...
41
votes
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 ...
1
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3answers
111 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
votes
3answers
191 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 ...
1
vote
1answer
454 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 ...
0
votes
2answers
77 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
votes
2answers
6k 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
493 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 ...
5
votes
1answer
383 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 ...
3
votes
3answers
606 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
votes
0answers
213 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
votes
2answers
6k 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 ...