Disk generally refers to disk storage (a general category of data storage mechanisms) which may include: Magnetic disk Floppy disk, a magnetic data storage device using a flexible disc. Hard disk drive, a non-volatile magnetic data storage device. Optical disc, commonly a polycarbonate disc ...
3
votes
1answer
35 views
Mixing dual and single port SAS disks
I have a HP DL380 G5 with 8x146GB single port SAS SSF disks (DG146ABAB4).
A couple of them have failed and I can't find any new single port disks anymore. They all seem to be dual port. I'm wondering ...
3
votes
0answers
21 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 ...
2
votes
4answers
104 views
What does “random seek time” really means in HDD benchmarks?
I am currently benchmarking a hard drive. I am using HW32 for the measurement.
The result has two parts:
random seek time: 20 ms
random read throughput: 30 Mbytes/s
I am not sure the methods HW32 ...
0
votes
2answers
49 views
How create ghost images and copy to many drives [closed]
I am looking for the cleanest and most reliable solution to create ghost images of a windows 7 based machine and copy these images to multiple hard drives.
I am looking for the software needed to ...
1
vote
2answers
44 views
Can I mount another drive to “/”, act like adding additional disk to “/”
System:
Ubuntu
Currently, the server has 50G disk, df output as below.
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/hda1 49448752 1445164 45491668 4% /
...
1
vote
1answer
32 views
Switch disks to another identical HP ML360 G6 with P410i array controller
In case of hardware failure, for example motherboard/processor, is it possible to put the disks of a raid 1 into a spare server to be back online asap.
If a disk failes and i want to use a disk of ...
2
votes
1answer
56 views
Freshly formatted ext4 drive appears to have several gigabytes already used
I have setup several drives in an Ubuntu 12.04 x64 machine by deleting all the partitions and formatting them as ext4 with fdisk, but when I ran df -h, it showed me that a substantial amount of the ...
0
votes
0answers
46 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 ...
0
votes
2answers
357 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 ...
1
vote
1answer
86 views
HP P410i Array Controller and lost logical Drive
Today earlier we lost the logical drive information for a 4 drive raid array that was array B!
The system had two arrays A and B A being the single system drive and B the Data drive of 4 x 136Gb ...
1
vote
3answers
30 views
Adding a new drive on a Linux database server
This is a general question to optimize performance, reliability, and consistency. I know that both of these methods work, I'm just wondering if there are (dis)advantages to one over the other.
...
2
votes
1answer
257 views
How can I connect a SAS drive to USB? [closed]
I have a Dell T710 with Seagate Cheetah 15k.7 SAS disks. If the T710 motherboard dies, I'll need to resort to one of my nightly off-site backups and salvage the journal/logfile from the SAS disk to ...
2
votes
4answers
85 views
Missing drive space in Server 2003
I have two drives used for SQL backups which for the last week have been acting strange - the free space indicated by windows is far off from what windirstat, etc indicates. There should only be about ...
0
votes
1answer
96 views
Short write and read speed disk benchmarking
We're using cloud hosting for some of our backend servers and we noticed that performance on the disks (which as confirmed by the provider are shared with other customers) vary depending on the ...
-2
votes
1answer
35 views
Disks online through power pull, replace? [closed]
Suppose you had a server cabinet and the power was pulled on the whole thing (this just happened to us).
Now suppose you had a hard drive (3.5" SATA WD Enterprise) that was not previously in use. It ...
0
votes
2answers
71 views
Meaning of LED signals in SATDOCK22RE disk duplicator by StarTech
We've just received a disk duplicator from StarTech - the SATDOCK22RE.
It looks like a nice system, but the manual is not clear about the various signals that the LEDs show.
Specifically, after we ...
0
votes
2answers
211 views
vmware esxi losing datastore
My vmware esxi server suddenly freezed this friday. When I looked up, what happend. I figured out lot of these messages in log
Device t10.ATA_____WDC_WD10EARS2D00Y5B1
...
1
vote
1answer
64 views
XP vm disk benchmark on xenserver 5.6
While benchmarking the disk on a Windows XP VM under XenServer 5.6 I get a peak for a couple of seconds to ~200 MB/s before it drops back to an average of 30 MB/s. Is this normal?
My configuration ...
1
vote
0answers
125 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 ...
1
vote
1answer
49 views
Frequent Disk Write
I am making a dataminer which needs to write to around 50 different files every 30 seconds. Each file is around 50kb. This process will run 24/7, 365 days a year. The dataminer is build on Node.js and ...
0
votes
1answer
94 views
NVRAM for journals on Linux?
I've been thinking about ways of speeding up disk I/O, and one of the bottlenecks I keep coming back to is the journal. There's an obvious benefit to using an SSD for the journal - over and above just ...
2
votes
3answers
96 views
What's the relation between “HP Diagnostics” the “Array Config Utility” and “Windows Disk Manager”
I have a failed drive that is reported in HP Diagnostics
https://localhost:2381/hpdiags/frontend2/frontend.php?
It tells me that Logical Drive 5 has a drive that is about to fail. The name of ...
4
votes
4answers
348 views
Linux: how many disk I/O does it take to read a file? How to minimize it?
According to this paper on Facebook's Haystack:
"Because of how the NAS appliances manage directory metadata, placing
thousands of files in a directory was extremely inefficient as the
...
2
votes
2answers
54 views
questions on replacing failing disk on solaris 10
I have replaced failed drives on Solaris 10 that are mirrored with SVM before. I am wondering if I have been doing it incorrectly... or taking a huge risk. I follow the usual metadetach, metaclear, ...
3
votes
2answers
86 views
How to view a full disk data (more than one partition) cloned with dd
I've a disk image done with dd:
dd if=/dev/sda of=/mnt/fulldisk.img
/dev/sda have some partitions (Windows+Linux)
My problem is: I need to know if the image is done well, how can I access data? ...
1
vote
2answers
79 views
Does this df -h output mean i have a ~ 140G area available?
I'm creating a AWS server from a ubuntu AMI - it didn't say how much disk space was allocated so I ran df -h and got the following result:
Filesystem Size Used Avail Use% Mounted on
...
6
votes
1answer
82 views
Backup process flushes disk cache
I've got a backup process which reads quite a lot of data from disk, and therefore uses up all memory for disk cache, swapping off apps and other cached data in the process. There is no benefit to ...
3
votes
2answers
151 views
Why does a CP command on linux consume CPU?
I just run a copy command for two large directories with a small number of huge files and I see my cp process is consuming around half a core in top:
51116 root 20 0 110m 876 688 D 43.9 ...
0
votes
2answers
208 views
decipher acronyms for Netapp disk shelf configuration options
I want to know what is the meaning of -C and QS to understand the difference between these two disk shelf configurations:
DSK SHLF,24x450GB,15K,3Gb SAS,IOM3,-C,R5
DSK SHLF,24x450GB,15K,3Gb ...
-6
votes
1answer
129 views
Enterprise class storage costs: $10k/TB. Are we paying too much? [closed]
Possible Duplicate:
Why is business-class storage so expensive?
The infrastructure team at my company charges $10,000 per TB for storage costs. They charge this to us (internal) when we ...
3
votes
5answers
305 views
If you don't need to cram more disks in the same space, do 2.5“ hdd have any advantage over 3.5”?
Nowadays many server systems use 2.5" hard disks, afaik because they can put more spindles in the same chassis and maybe they use less power. When I don't need / cannot put more disks, is there any ...
0
votes
1answer
33 views
how can i merge two partitions in two different servers in to one
I am using centos. I have having two servers with disk space 300 GB in each server. Is it possible to merge it and can be used as a single diskspace of 600gb
0
votes
1answer
334 views
Xen Disk Performence Issues
I'm currently using Xen PV on CentOS 5 with my domU's as flat files running on a hardware RAID controlled (write cache enabled) formatted with XFS. On the dom0 I can get about 500MB/s in a 2GB dd ...
0
votes
1answer
58 views
Can i remapped bad block on Live RHEL5 system using following command
I am getting following disk error on one of my server
smartd[4235]: Device: /dev/sda, 1 Currently unreadable (pending) sectors
Can i apply following command to repair bad block on live RHEL5 system ...
0
votes
1answer
211 views
Disk is spinning down each minute, unable to disable it
I played with spindown and APM settings of my Samsung discs and now they spin down every minute. I want to disable it, but it seems it does not accept any of the spindown time or APM values. Nothing ...
3
votes
1answer
166 views
Poor NFS performance when sequentially reading large files
I have an NFS3 server with multiple clients. Each client is sequentially reading a different large file, and performance is very poor.
Here is what I am observing in iostat on the server for the disk ...
2
votes
1answer
168 views
monitoring disk i/o via wmi
I'm using WMI to monitor Windows Server 2003 and Windows Server 2008 hosts. I got all the info I wanted but the disk I/O performance.
I've tried quering the ...
1
vote
1answer
37 views
A simple device to quickly erase the MBR on a sata drive
Is there a device that I can plug SATA disks into to erase the MBR? I know this could be done with a computer, but I'd rather have something compact, not unlike a disk duplicator. In fact I've even ...
0
votes
2answers
142 views
RAID 1 disk is marked as Spare after replacement
one of two disks in my RAID 1 died so I replaced it.
When new disk has been added to array the sync process started and few minutes later it has become a Spare.
How can I "force" the disk to be a ...
0
votes
1answer
62 views
Cloning server disk image creates networking issues
We have a bunch of Apple xservers but only one of them has VGA output and CD Drive. We've decided to replace OSX with Debian Linux (Squeeze for ppc). Meanwhile, my efforts to get the machines send ...
1
vote
1answer
64 views
What is the fastest delete method for many directory on Linux
I have to remove many directory.
but
rm -r /data
is so slow ( about some days)
/data has
/data/a/b/c/d/e/f/g/h ....
many dirs
Does anyone know?
-2
votes
1answer
81 views
Disk buffer: why does it even exist in many disk controllers?
When you request disk for data, it usually first gets transferred to the disk buffer in the disk controller, and then it gets sent up to RAM (and thus stored in memory). I was just wondering what the ...
1
vote
2answers
72 views
Why do some filesystems out there have imaps to imaps to imaps (multiple imaps)?
It seems that the point of an imap is to hold points to individual inodes so that writes can be done in a really fast manner (can someone explain how this works as well?) but I was wondering what the ...
3
votes
2answers
202 views
Linux disable disk cache for a single command
Our server is performing decently, but when backups or other scan processes run it will tank the entire server. Something like clamd will run and scan many files. While we expect slow performance, ...
1
vote
1answer
159 views
Solaris 10 new disk discovering
I'm having issues with a Solaris 10 SPARC host... It seems not able to discover newly provisioned disks. The disks are fed through a QLogic 2300 FC HBA.
I've tried cfgadm -al/cfgadm -f -c configure ...
5
votes
2answers
207 views
How long should rebuilding 250GB take?
In a PowerEdge 1900 have I a hardware RAID 5 of 5x250GB disks + 1 hot spare 250GB.
Disk 2 have errors, so I forced it offline in the raid bios to replace it.
Now it have been rebuilding to the hot ...
2
votes
4answers
311 views
how can I perform a disk performance test like hdparm -t in nagios?
The usual plugins are all about known stats of a system but we are seeing really odd results on some of our vmware instances with hdparm -t.
Anyone know of a test actually does a write/read on a disk ...
0
votes
2answers
91 views
Possible disk IO problem. Help to be sure.
Since some time days ago, one of my servers started crashing. Currently it is crashing almost every day. Sometimes, over once a day. Only a restart can solve.
The last time the problem happend, the ...
0
votes
0answers
31 views
why the Spanned volume in win2003 no longer work?
I have a Spanned volume of 2 disc in win2003, and moved the 2 disc to another win2003 to export data, it just can't recognize, i just assigned a volume to disc, no effect , then i moved the disc back, ...
1
vote
3answers
102 views
Odd variance in disk performance testing results
I started out trying to do some simple performance tests. "Which of these disks is faster, and by how much" kind of things. I didn't need much precision, I just wanted a rough idea. It's turned ...
