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

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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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2answers
239 views

Confirm disk is broken when it passes all diagnostics

I have a system with a potentially broken disk, but the disk passes all manner of diagnostics. I have been unable to confirm that the disk is broken. What are my options? I could just replace the ...
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1answer
199 views

Does a 3ware “ECC-ERROR” matter on a JBOD when I have ZFS?

I have a FreeBSD 8.x machine running ZFS and with a 3ware 9690SA controller. The 3ware controller shows an ECC-ERROR with one of the disks: //host> /c0 show VPort Status Unit Size ...
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2answers
113 views

How can I detect hard drive failures? [closed]

I am in charge of a large number of Windows servers. Recently, many have been reporting hard drive errors with event codes 11 and 55. CHKDSK indicates that the drives are fine most of the time. What ...
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1answer
41 views

Monitoring Windows Hard Drives

When you run several 100 windows servers and even business systems, what is a good option for monitoring hard disks and checking for bad sectors? Are there applications out there that can send e-mail ...
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3answers
228 views

Dramatic disk I/O performance difference for two disks on same machine

A small machine (1 core, 1 GB RAM, CentOs 6.3) virtualized via Citrix Xen has 3 virtual disks with very different sizes. > cat /etc/fstab (snippet) ... /dev/mapper/vg_stagingnfs-lv_root / ext4 ...
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4answers
1k views

how to find a not formatted hard disk on linux

My server has 2 hard disks. One very limited of around 500 GB and another NOT FORMATTED of more than 1 TB. I need to find this second disk to format it (and eventually mount it to my Red Hat 6 ...
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1answer
491 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 ...
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2answers
203 views

How to repair a disk on Ubuntu when fsck fails?

I was able to start a broken raid 1 system with one available and one broken disk by issuing the following command. mdadm --assemble --force /dev/md9 /dev/sda1 /dev/sda2 I was able to copy the ...
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1answer
178 views

Will configuring a server with RAID 5 and (2*500gb) + (2*1TB) work?

I'm currently setting up a DELL server, which came with 2*500gb disk drives but is configured in RAID 1. I want to increase the total capacity of the disk storage to at least 1TB. Now with it being ...
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1answer
36 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 ...
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1answer
138 views

Which directory hierarchy will be the best/fastest?

I have a pretty big directory with many cache files which I want to reorganise for max performance (access times). 2x 2TB SATA III drives, software RAID 1 (mirroring) OS: Ubuntu 12.04 LTS ...
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123 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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3answers
1k views

Disk 0 Failed in RAID-1 on Dell PE2950

I'm sure I probably know the answer to this question, and am just looking for some reassurance! We have a Dell PE2950 with a RAID-1 (2 x 300GB) for the OS and a RAID-5 (4 x 300GB) housing some SQL ...
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1answer
203 views

Data syncing behavior for filesystems in Windows

In Linux mounting supports commit option, which is described in mount(8) man page as: commit=nrsec Sync all data and metadata every nrsec seconds. The default value is 5 seconds. Zero ...
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1answer
83 views

boot a non-raid disk on a server

I have a HP ML310e that I am trying to recover data off. It has a RAID 10 array and I am wanting to boot a non-raid hard drive on the server. I can't see this disk in the bios, so I can't boot from ...
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2answers
365 views

RAID 1 hard disks errors, file system is not mounting

I have a Server with 2 HDDs in soft RAID 1, the OS is Debian Wheezy. After some database testing, the file system has gone to read-only mode, after which I have rebooted the machine. The server is not ...
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51 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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1answer
372 views

Resize/extend partition size CentOS

Im tasked to resize a partition on a remote server. I've read up on it and understand that i'll need unmount and use resize2fs /dev/sdato expand the partition size. Can someone please help me unmount ...
2
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1answer
226 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 ...
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1answer
121 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 ...
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1answer
95 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 ...
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2answers
6k 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 ...
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2answers
907 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. ...
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1answer
112 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 ...
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3answers
540 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 ...
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2answers
543 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: ...
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2answers
167 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 ...
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1answer
941 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 ...
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1answer
88 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 ...
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1answer
124 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 ...
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0answers
244 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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2answers
182 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 ...
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1answer
66 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
126 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
1k 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
48 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
207 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
967 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
465 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
609 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
990 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
352 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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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
43 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
291 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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3answers
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
518 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
722 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 ...