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

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41
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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 ...
1
vote
3answers
124 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
217 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
468 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. ...
2
votes
0answers
526 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
423 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
702 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
223 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) ...
4
votes
2answers
8k 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 ...
0
votes
1answer
177 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
votes
1answer
5k 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 ...
4
votes
2answers
3k 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 ...
0
votes
2answers
268 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 ...
2
votes
2answers
924 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 ...
0
votes
2answers
669 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
votes
1answer
150 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
119 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
votes
1answer
49 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 ...
-1
votes
3answers
191 views

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
votes
1answer
611 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
votes
1answer
2k 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
votes
2answers
557 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 ...
3
votes
1answer
4k views

Server 2012 Core (no GUI) - How to manage disks?

I am working on Server 2012 which doesn't have a GUI. For now, I have two hard disks. My first one is already formatted and I see it as C: Now, I'd like to format my second hard drive and create a D: ...
1
vote
1answer
488 views

How to Mount remote disc as local in Windows 7 and Windows 2003?

Is it possible to mount remote file system (on Windows 2003 server) as local disk in Windows 7? I have Windows 2003 server with software RAID and some shares. On another computer with Windows 7 I have ...
0
votes
1answer
141 views

Disk speed test linux

Is there any simple command (or tool) to test the speed (MB/sec) of disk access? I've found hdparm but It look it only works for local disk. I need to evaluate the speed of remote NFS-mounted disk. ...
0
votes
1answer
317 views

Proxmox VE Logical Volume in RAW format?

I added a Volume group in Proxmox VE as Storage for KVM VMs. A new Logical Volume will be created for each VM, but in Proxmox VE under The Defined Storage which shows list of created Logical Volumes I ...
-3
votes
1answer
50 views

number of disks for RAID config vs. effect on performance? [closed]

I was wondering how the number of disks used for RAID configuration affects performance? I know that it takes longer to rebuild data, but are there any other performance areas affected??
11
votes
4answers
3k views

Available disk space on Unix/Linux OS

How to get available disk space on Unix/Linux OS, including unallocated space (which wasn't assigned to any partitions)?
2
votes
2answers
149 views

Do we need to perform disk checking periodically on Linux

Do we need to perform periodic disk checking,for bad blocks and bad sectors?. Our servers havent been restarted for last 4 months,also no disk checking have been performed on any disks. Can that can ...
-3
votes
2answers
618 views

I have a HD with bad sectors, can I configure windows to only retry a failed read once? [closed]

I have a bad HD (numerous bad sectors) I'm attempting to get some of the data off, however Windows keeps trying to reread the bad sectors - resulting in a really really long wait time can I ...
1
vote
3answers
2k views

RAID10 without write-back cache = horrible write performance?

I have just provisioned a dedicated server on singlehop. I'm running it through some tests to know what to expect performance-wise. On the I/O side (with 4 1TB disks in RAID 10) I get: write-cache ...
2
votes
1answer
74 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. ...
-1
votes
2answers
1k views

Shrink a Windows VM in XenServer

I faced a problem. I deployed a VM by size of 500GB on Citrix XenServer and now I want to shrink it, because I don't have enough space for snapshots. Now I want to perform an export/import to do this. ...
2
votes
2answers
1k views

How iostat figures out to take CPU idle time to consider as %idle or %iowait?

I was going through iostat man page. According to it, %iowait Show the percentage of time that the CPU or CPUs were idle during which the system had an outstanding disk I/O request. %idle ...
1
vote
2answers
641 views

Refresh /dev/sdx list

I've been messing around with my storage array (in that case 2xMD3000 SAS) and between the scans/rescans/delete/add my /dev/sdx block devices are all messed up. Some of them are non existent and using ...
5
votes
2answers
1k views

Disk (EXT4) suddenly empty without any sign of why

I have a Ubuntu 10.04 server with several disks in it. The disks are setup with a union filesystem, which presents them all as one logical /home. A few days ago, one of the disks appears to have ...
1
vote
1answer
80 views

I need to mount directory from one hdd to public_html folder [duplicate]

Possible Duplicate: Hard drive on server which hosts public_html folder is full. What to do? i have a hard drive (1TB) which has a folder named "flvideo2" i need to mount into ...
1
vote
1answer
612 views

Controlling mdadm faulty disk rebuild order in RAID 10 array

I have a Linux mdadm RAID 10 array comprising of 6 (SATA) disks configured with n2 copies. While pulling out one disk, another one in another mirror pair failed. Leaving me with: $ cat /proc/mdstat ...
2
votes
2answers
141 views

Disk space profiling in Unix

I'm looking for a tool to summarize how disk space is being used on very large partitions. Our file system is around 950TB, mostly broken up into 20TB partitions. There are some really nice graphical ...
3
votes
0answers
44 views

How can I measure disk cache churn on Linux? [duplicate]

Possible Duplicate: Is there a way to get Cache Hit/Miss ratios for block devices in Linux? I have a file server which serves out large (25GB-1TB+) files over the network from local ...
0
votes
1answer
72 views

Find out who is using what disk group [closed]

I would like to find out which databases/processes are using which disk group. I was notified that our Disk I/O was starting to get pretty high. I'm on a Solaris box (Sun - Fire 15000) running Solaris ...
0
votes
2answers
3k views

Is there any way to shrink qcow2 image without converting it raw?

Is there any way to shrink qcow2 image without converting it raw? I cannot convert it to raw because I don't have disk space enough for raw image.
1
vote
1answer
2k views

how to enlarge disk space on /dev/xvde1 for AWS ec2 instance?

I created an EC2 instance with type of m1.small and later found it's lack of space. I then stop the instance and change the type to m1.xlarge. However, I have no luck on getting more space. df -a ...
2
votes
3answers
810 views

ZPOOL Mirror setup

What is the best setup for an zpool intended for database big inserts or TCP/IP dumps (i mean sustained high write throughput using 4 disks ? I want buy 4 Wd RE4 2TB drives and get the more power i ...
2
votes
3answers
541 views

Exchange 2010 VMDK disk design

I am deploying Exchange 2010 on a single server on my VMware/SAN. We have about 100 mailboxes. I will be using normal VMDK disks, so my question is about the disk design. Should I put everything on ...
1
vote
1answer
139 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 ...
4
votes
1answer
282 views

Can I generate I/O activity with a max (throttled) throughput?

For example, is there a tool or method where I can say (for example) "generate up to 50 MB/s of read activity to this file, but no greater"? Or configure a tiny delay between read operations, which ...
6
votes
1answer
978 views

No space left on device — but there is space

I'm running an Ubuntu 12.04.1 server in a VMware virtualized environment that has a strange issue. Twice now, at seemingly random times, the machine has suddenly been unable to write to the root ...