The disk tag has no wiki summary.
0
votes
3answers
75 views
Lost 6TB NTFS partition
I have a 6TB raid array that was formatted as NTFS but has disappeared. (note that this is hardware raid, not md)
When I created it, windows wouldn't let me create > 2tb. So I created it on a Linux ...
0
votes
0answers
33 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
50 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 ...
0
votes
0answers
10 views
MySQL tables/databases into different disks [migrated]
I am aware that there is a possibility to have a single database server with many tables/databases, and you can separate some of those tables/databases into separate disks.
Lets say you have 5 ...
4
votes
4answers
266 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
...
1
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0answers
16 views
Substantial difference between database size under MySQL and actual size on disk [migrated]
When I check the size of my databases under MySQL I get this:
MariaDB [(none)]> SELECT table_schema "Data Base Name", sum( data_length + index_length ) / 1024 / 1024 "Data Base Size in MB", ...
1
vote
0answers
24 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
62 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? ...
2
votes
0answers
28 views
How do I get my disks to spin down after one hour? [migrated]
I'm currently configuring a new home server, and I am trying to get the disks to spin down after one hour. But they do not spin down.
Setup
I have my entire system on an ssd: /dev/sda. I have three ...
1
vote
2answers
67 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
...
5
votes
1answer
46 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
119 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
107 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
96 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 ...
4
votes
5answers
271 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
30 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
173 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
31 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
129 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
100 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
98 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
32 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
66 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
55 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
54 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
69 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
67 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
115 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
79 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
120 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
190 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
75 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 ...
-1
votes
0answers
49 views
HP-UX, multiple boot disk and dynamic root disk (drd)
I have a HP-UX v3 server installed on the volume group vg00 composed by 3 boot LUN of 250 GB each one and other free LUN of 250 GB each one.
I would like use these free LUN to clone the boot volume ...
0
votes
0answers
17 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
2answers
80 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 ...
19
votes
4answers
579 views
Why would a heavily disk intensive application run faster on a SAN than on a Physical Disk?
Why would a heavily disk intensive application run faster on a SAN than on a Physical Disk? I would have expected the Physical disk to be slightly faster but in fact the process ran 100 times faster ...
1
vote
2answers
119 views
What's the best program to use for copying 12TB of data onto 4 3TB hard drives on linux?
I have a 12TB enclosure that's filled with data (ext3). I'd like to make a copy of it, spanned across individual 3TB disks, each of which is readable on its own (no RAID or bonding). Ideally, I'd like ...
2
votes
5answers
171 views
Disk full on linux server, blocks used is much less then blocks avalable
Output of df is:
[root@backup log]# df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mapper/VolGro 1889811408 1861658948 0 100% /
/dev/sda1 101086 ...
0
votes
1answer
43 views
Convert system dynamic disk w/o data-loss windows server 2003
Does anybody know how to convert dynamic system disk to basic in Windows server 2003 without data-loss and if possible without using third-party tools? Is that possible?
I was thinking of making a ...
2
votes
1answer
89 views
Is it possible to repartition running system (Debian) without loosing data
We need to resize the partition that is mounted to /var on a running machine. The only way to access it is via SSH, so live CD is not an option for us.
Can we repartition the file system without ...
1
vote
1answer
113 views
System process hogging disk, can't find why
Recenty I have noticed my hard drive activity unusually increased, to the point the system is sometimes bogged down.
Using resource monitor, it shows the system process writing constantly to a file ...
3
votes
2answers
123 views
SAS disk, red light means it's failing?
My server uses SAS 15k RPM disks. One of them has a red light. AFAIK, that means that it needs to be replaced; but it's not used intensively - actually the server was still in the configuration stage, ...
17
votes
4answers
936 views
Is a hard drive's serial number globally unique?
On Linux I can use smartctl to get a hard drive's vendor, model, firmware revision and serial number:
# smartctl -a /dev/sdb
smartctl 5.40 2010-07-12 r3124 [x86_64-unknown-linux-gnu] (local build)
...
1
vote
3answers
113 views
linux - disk space missing
# df -h /
Filesystem Size Used Avail Use% Mounted on
rootfs 9.9G 7.2G 2.2G 77% /
# du -hx --max-depth=0 /
3.2G /
As you can see, df says 7.2GB is used, but du can ...
0
votes
0answers
88 views
Slow disk i/o (especially flushing to disk) with Mac Mini running Win7 via bootcamp
I've noticed that the disk i/o performance of our mac minis (Macmini3,1: 2.26GHz C2D with 2GB ram and a 160GB 5400rpm drive) is rather slow. In particular, the FlushBuffersFile system call seems to be ...
0
votes
1answer
29 views
Within IRIX : enumerate physical drives, and their capacity
I'd like to know what physical disk drives are attached to an IRIX system, and the capacity (or at least geometry) of each disk. I can get the former through hinv, but that doesn't include ...
1
vote
2answers
104 views
How to claim unallocated space on disk
On windows 2008 R1 server, I have a 1Tb disk that has about 400Gb at the end that's not used. I have the boot partition, then a logic volume, then the free space. I want to create a new simple volume ...
1
vote
2answers
162 views
Linux RHEL how to differentiate between a local disk and a SAN disk
I have a server with several disks and partitions. For an specific disk I want to know if it is local or in the SAN.
I ran some commands:
[root@server]# ls -l /sys/block/*/device
lrwxrwxrwx 1 root ...
0
votes
1answer
54 views
IO and bus errors on Ubuntu Server
I've got an old computer running Ubuntu Server 10.04, which acts as router, file server and web server. A couple of weeks ago I inserted a PCIe video card, since the motherboard did not have any video ...
3
votes
3answers
119 views
Is visiting the memory of a remote system through network faster than local disk seek?
It seems that network connections are usually faster than local disk seek, as discussed in the question Are networks now faster than disks?
I come up with this question when I am using Berkeley DB, ...
