Questions about hard disks' performance, issues, tips, and software.

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11
votes
4answers
1k views

Disk Speed Performance in a SAN

We are currently looking into buying a SAN, and have some concerns over the speed of disks we are going to put into the array. We would normally have gone for 15k disks over 10k every time, but one of ...
0
votes
0answers
103 views

hdparm: Hard drive spin down logs

I've been using hdparm successfully to spin down hard drives on some systems, however I'm curious, is there anyway I can make hdparm generate some kind of spin down log, so I can further optimize the ...
0
votes
1answer
482 views

High CPU load caused by slow disks?

We are running a online application on a 3-year old server (quadcore Xeon, 4GB RAM, SAN-disks). The server hosts besides the web application a SQL-, FTP-, SFTP, SMTP, and POP-services. Over the years ...
2
votes
4answers
2k views

How to make RHEL have persistent local hdd name?

I have 2 identical Dell R720 servers running identical Oracle Enterprise Linux(RHEL)6.4. Both servers (supposedly) configured in exactly the same way. However, one of the servers is behaving ...
0
votes
1answer
166 views

Connecting SATA 3 to SAS port performance analysis

SATA 3 hard disk can be connected to SAS ports. But If i connect SATA 3 drive to a SAS port then can i get same speed as SATA 3 originally offers or will it be a difference? Will it reduce the ...
1
vote
1answer
405 views

Raid Controller not recognizing hdds after removal. Poweredge 6950

I have a Dell Poweredge 6950 running server 2012 with 4 hdds. 80gb raptor (with OS), 2 500gb WD black in raid 0 and a 1tb raptor. I shut off the server, removed the 2 hdds in raid and the 1tb raptor. ...
1
vote
1answer
169 views

What hard drives does a HP Proliant BL20p G3 Blade Server take?

Full name: HP Proliant BL20p G3 Blade Server 380634-B21 I'm currently a student and got a Proliant with no hard drives for £19.99. Could anyone point me to the right hard drives to get for it, I'm ...
14
votes
6answers
9k views

Is bit rot on hard drives a real problem? What can be done about it?

A friend is talking with me about the problem of bit rot - bits on drives randomly flipping, corrupting data. Incredibly rare, but with enough time it could be a problem, and it's impossible to ...
3
votes
2answers
204 views

Age replacement policy for hard disks and SSDs at servers

I'm planing an age replacement policy for our storage and servers. Most of them are for DBs and some for images (static content) so yes, they have an huge I/O everytime. Also, we use Samsung 840 Pro ...
2
votes
2answers
137 views

Simulate database I/O behaviour [closed]

I'm investigating some performance issue and I need a tool that can mock the same I/O behavior that a typical RDBMS is usually creating. I don't want to install a full blown RDBMS and mess around with ...
1
vote
1answer
163 views

Which filesystem is this volume, I want to mount to an ubuntu server?

See those images below, it shows errors like wrong fs type, bad option, bad superblock, missing codepage or helper program, or other error.... I just tried to mount it as FAT mount /dev/sdf ...
0
votes
4answers
148 views

How do I mount a linux filesystem harddisk to a Windows server? [closed]

When I try to mount a linux filesystem harddisk to a Windows server. It will show that the harddisk is not initialized and unallocated in computer management, but it simply does not show up as A drive ...
3
votes
1answer
344 views

Using consumer grade hard drives in a server

My company needs to upgrade a couple of (very) old servers we are currently running, but we are kinda strapped for cash. We got a great offer on a pair of HP DL360 G6 servers, but the hard drive cost ...
1
vote
2answers
94 views

How can it be that mounting and unmounting takes hours to complete?

I am running an Ubuntu server 10.10 machine with 24 hard disks (and two OS drives). I am using a script to mount all the drives to their desired mountpoints. This works pretty fast, as expected, ...
0
votes
2answers
153 views

Expandable Linux filesystem w/ redundancy & support for different drive sizes?

I did a bit of research already and didn't come across any filesystems so far that have the following features: Expandability, Redundancy, and the ability to utilize the full capacity of different ...
9
votes
3answers
29k views

SAS vs. Nearline/MDL SAS - What is the difference?

As subject I guess, looking at SAN's and most vendors offer 10k or 15k "proper" SAS drives, many also offer 7.2k MDL/Nearline SAS drives. Does anyone have an authoritative explanation of the ...
0
votes
2answers
159 views

Missing hard drive on df -H command on Centos 6.4 [closed]

I have 2*1000GB hard drives + 60GB SSD. When I'm running df -H I'm getting "wrong" information about the server's hard drives. The output # df -H Filesystem Size Used Avail Use% ...
3
votes
3answers
3k views

Is it wise to use SSHDs (Solid state hybrid drives) on a server?

I have a bunch of servers with very heavy I/O that currently use SATA3/SAS drives, but do suffer from I/O wait on the SATA drives, and I have just been alerted to the existence of SSHDs which cost the ...
2
votes
0answers
99 views

Shrinking a volume and extending another in dynamic disk

I have a test environment where I converted a disk to dynamic, shrunk a volume, and then expanded another all on the same disk. The result is that disk management in Windows Server 2008 R2 shows two ...
1
vote
1answer
3k views

Creating Persistent Drive Labels With UDEV Using /dev/disk/by-path

I have a new BackBlaze Pod (BackBlaze Pod 2.0). It has 45 3TB drives and they when I first set it up they were labeled /dev/sda through /dev/sdz and /dev/sdaa through /dev/sdas. I used mdadm to ...
2
votes
1answer
284 views

Why does my ReadyNas 4200 have a constant beep post disk failure

Went to check on a high pitched constant beep coming from the server room and discovered that all the LED lights on the disks were black except one which had a constant green. Post a Re-boot nothing ...
1
vote
0answers
143 views

best setup for fast sustained streaming (sequential?) disk writes

i am setting up a high speed/high resolution scientific image acquisition system. i need data write rates of ~1 GB/sec sustained for ~1 hour. i don't have experience with raid, but my plan is to ...
0
votes
0answers
1k views

KVM LVM-based guest… kernel: Buffer I/O error on device. Failing drive?

Currently setting up a small KVM host to run a few VMs for a small business. The server has 2 drives in software md RAID 1, then I have it set as a PV in an LVM setup. Guests and hosts are all CentOS ...
-1
votes
1answer
569 views

Linux “/dev/SDA” goes read only file system on SDB device failure [closed]

i have a very peculiar issue that is running in my system. Using debian linux : My system boots up very normally with a primary and secondary hard disk. suddenly my secondary hard disk fails with ...
0
votes
1answer
3k views

Dell PowerEdge 1950 physical disk has foreign status error

Dell PowerEdge 1950 has an issue with a raid. I have 2 disks on the raid, and it fails. When looking at Dell Open Manage it is because both disks show as state = foreign. Name State ...
0
votes
1answer
112 views

HDD operations slow server down, hangs completely

When running a tar cvzf command or copying large folders on the production server, the CPU load goes up to 8.5 (running on 8 cores) and the whole system hangs, neither apache is responding to any ...
0
votes
1answer
437 views

Hard drives indication with controller MegaRAID SAS 9261-8i on HP Proliant DL320e Gen8. Is it possible?

Give me advice, please. My situation: There're the server HP ProLiant DL320e Gen8 and MegaRAID SAS 9261-8i RAID Controller. I installed Controller into server and I reconnected Mini-SAS cord from ...
1
vote
2answers
172 views

Calculating IOPS for a single HDD - what am I doing wrong?

So I know there is no standardized way of calculating IOPS for a HDD, but from everything I have read it appears one of the most accurate formulas is the following: IOP/ms = + {rotational latency} ...
3
votes
1answer
3k views

Mounting an old LVM hard drive in Fedora 17 gives error message

On Fedora 17, I am trying to mount a hard drive as slave using the following command: mount /dev/sda5 /mnt/fedora8 And I get this error: mount: unknown filesystem type 'LVM2_member' How do I ...
48
votes
8answers
2k views

What are the advantages of tape drives?

IBM still develop and sell tape drives today. The capacity of them seems to be on a par with today's hard drives, but the search time and transfer rate are both significantly lower than that of hard ...
2
votes
3answers
13k views

Reinserted a RAID disk. Defined as foreign. Is import or clear the correct choice?

I have re-inserted a RAID disk, on a DELL server with Windows Server 2008. The drive-status indicator was changing between a green and amber light, and the monitor gave the following message: ...
0
votes
2answers
156 views

Replacement Alternative for Dell FY606 in a Poweredge T105

I have recently upgraded my Poweredge T105 server to use a SAS 6/ir RAID controller. Unfortunately, I did not realize at the time that adding the card would cause the BIOS to complain about a missing ...
0
votes
1answer
202 views

mhddfs not support single file to split multiple hard drives.. if file size exceed limit of single storage device

I'm using mhddfs to combine multiple drives that are mounted over network using NFS. e.g. There are three machines Server Name Dir Space Server 1 /home 10 GB Space Server 2 /home 10 GB ...
1
vote
1answer
577 views

kernel warning disk error for command write - solaris svm

Recently this warning came up on my message logs, scsi: [ID 107833 kern.warning] WARNING: /pci@1c,600000/scsi@2/sd@0,0 (sd0): Oct 27 00:14:44 Error for Command: write(10) Error Level:Retryable ...
0
votes
1answer
1k views

FreeNAS not detecting hard drive

I have a FreeNAS box (OS install onto USB), with 2 hard drives in it. In the GUI its only showing 1 (ada0). How do I make it detect the other one? They are both showing in dmesg: ada0 at ahcich1 ...
0
votes
1answer
276 views

Windows server's HDD Spin down daily/nightly - Does it makes sense?

A Windows Server 2003 R2 has the following hard disk configuration: - 3 internal hard disks attached to a 3Ware unit, configured in Raid 1 + spare unit - 3 external USB backup disks: 2 Verbatim 1TB ...
0
votes
2answers
183 views

A faulty Caviar Blue hard drive?

We have a small "homemade" server running fully updated Debian Wheezy (amd64). One hard drive installed: WDC WD6400AAKS. The motherboard is ASUS M4N68T V2. The usual load: CPU: an average of 20% ...
-1
votes
1answer
293 views

Display Power on hours of hard disk from shell

Is there a program which can display the power on hours of a hard disk from a *nix shell? I'm rewriting a server benchmark program, and this would be a useful value to compare.
1
vote
4answers
7k views

How can I recover files from a disk with crc errors?

Details: Windows 7 32-bit 2.5" laptop disk with two partitions (A & B). When mounted via USB, files on partition B can be accessed fine. Partition A was working intermittently, but is no longer ...
1
vote
3answers
785 views

How to identify faulty drive on a HP DL160 G6 - P410 Smart Array

I have a HP DL160 G6 Server with 4 HP SAS drive, firmware have been updated to the latest on the HD and the Smart Array... The issue im having is that one of the disk have a steady amber light turned ...
0
votes
2answers
236 views

Create logical volumes from partitions in linux

I have a server running RHEL with below hard disks configuration. [root@localhost indika]# fdisk -l Disk /dev/sda: 150.3 GB, 150323855360 bytes 255 heads, 63 sectors/track, 18275 cylinders Units = ...
-1
votes
1answer
45 views

Formatting Hard Drive in windows

What is the differences between quick format and normal format in windows? I Just formatted my external Hard Drive by quick format and it took a minute to complete and then I just started formatting ...
-1
votes
1answer
138 views

Can I improve speed in Hyper-V?

I use Windows Server 2008 R2 (it is host) with Hyper-V and a guest running Ubuntu 12.04 LTC. It is my settings: RAM 32768 Cores (virtual processes) 4. (I need 12) I also use virtual hard drive ...
2
votes
1answer
45 views

Ubuntu Windows Azure mass storage

I just started using Windows Azure service. I created an XL machine, and I got 28GB on the primary partition and a whopping 600GB on the temporary partition. My application needs a lot more space ...
2
votes
6answers
10k views

NTFS hard disk repair utility in linux

Is there a hard disk utility which can format(NTFS) &repair a HDD which has lots of bad sectors like Norton Disk Doctor from Linux ?
0
votes
1answer
172 views

Raid0 assemble disk again?

Our server recently suffered a disk failure, so our hosting provider put a new Disk in with CentOS so we can login and see if we can recover the data. We had 2 x 120 GB SSD drives in software RAID0 ...
37
votes
7answers
50k views

How can I monitor hard disk load on linux

Is there a good command line utility to monitor hard disk load on linux? Something like top but then monitoring disk activity i.s.o. cpu usage. More specifically, I suspect that for some (heavy load) ...
10
votes
2answers
411 views

What are 19mm high 3.5" hard disks called?

According to Wikipedia a normal 3.5" harddisk is 25.4mm high, but then there exist also a 19mm version, which I need for a HP ProLiant MicroServer. Looking at our resellers webshop I see the ...
3
votes
3answers
807 views

Ubuntu Device-mapper seems to be invincible!

I'm working on a hopefully unrelated question question and I've got to a strange situation. First: I know very little about the very low level hardware kernel storage driver magix, so I'm hoping a) ...
2
votes
2answers
1k views

How to find a compatible disk for HP server?

How to find a compatible disk for HP server? I own HP ML350 G6 server. I have found a spare parts list, but since there is no disk of size 300 GB 2.5 10K 6G (originally installed on server) I am ...