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

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2
votes
6answers
13k views

How many times can you format a hard-drive?

I've read mixed cases all over the place regarding the life of a typical hard drive, and if reformatting degrades the disk. If so, could you measure the life of the disk in a practical manner or ...
0
votes
2answers
541 views

smartctl reports Current Pending Sectors as 2, but a long test doesn't find any errors

The SMART attributes on the drive are: SMART Attributes Data Structure revision number: 16 Vendor Specific SMART Attributes with Thresholds: ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH ...
2
votes
5answers
12k views

Replacing a dead hard drive in RAID 5 with a different type

One of the drives failed in my server configured with RAID 5, and I can't find a exact replacement. From my understanding, RAID 5 supports drives with different sizes. Is this safe? Any ...
0
votes
0answers
45 views

Server drives gives input/output error when formatting in Fedora

I am at a total loss as to why this is happening. I have tried everything I can think of. I am trying to format a drive in Fedora to use in the server. Every time I try to format it I get a ...
0
votes
0answers
123 views

How is it possible for reallocated sector count to decrease?

The reallocated sector count of a disk in a RAID array has been increasing over the past 6 months, but now it seems as though the reallocated sector count has decreased. A month ago (according to ...
1
vote
2answers
1k views

How to diagnose failed drive on server with raid storage controller?

I have problem with one of my Dell PowerEdge R210. Machine is with Centos 6, today system logs started to inform that the hard drive is failing. Jan 6 03:20:12 centos6 kernel: LSI Debug log info ...
0
votes
0answers
226 views

Replacing failed drive on a ESXi host

I have a failing drive on my ESXi 4 host and I'm going to replace it. There is no fault tolerance (RAID), each drive on its own. I'm planning do offline dding old drive to new one but I'm not sure ...
5
votes
3answers
9k views

hdparm on OS X

On Linux, I can verify and change the low level parameters of my disk drive using hdparm. Is there an utility providing the same capabilities for OS X, or perhaps some other way of manipulating the ...
0
votes
2answers
733 views

Install Winsat on server 2012? Windows System Assesment Tool

I use winsat disk to see my disk read / write speed windows 8 and it works great: cmd : winsat disk -drive c Can this be used on windows server 2012?
0
votes
0answers
145 views

Azure disk performance

I am running on-demand, research D14 instance in Azure South Central US region, with a 4-disk RAID0. Recently the disk performance has become unusably slow, particularly the RAID performance, which is ...
3
votes
3answers
8k views

How to repair the fstab file with current configuration

I'm using Ubuntu 10.04 and i accidently removed all the entries from the fstab files while doing a backup (Yeah, I know ;)). I would like to know if there is a way to rebuild it with the current ...
0
votes
0answers
190 views

External HDD wrong size

I have an very interesting problem with a Seagate HDD (3TB): Under Windows the HDD has a size of ~3TB. When I connect it to Ubuntu 14.04 and try to format it with GParted, GParted tells me that the ...
0
votes
1answer
148 views

Windows Software RAID with Bad Sector: Which drive is broken?

We have three Seagate drives in a Windows software RAID stripe arrangement. The server began to freeze up. I was running two backups simultaneously with Acronis and BackupChain and thought I ...
0
votes
0answers
85 views

Linux quota - wrong disk usage

I'm using centos 6 and quota shows wrong disk usage for all users... Something like multiply real disk usage... # quota -v myuser Disk quotas for user myuser (uid 511): Filesystem blocks ...
1
vote
3answers
69 views

distributing tables over multiple harddrives

Is there a performance improvement when I distribute database tables over different harddrives? I need to access many different schemas at the same time and I was wondering if adding more harddrives ...
0
votes
0answers
55 views

Additional hard drive not detected in BIOS

So I'm working on a server which has a Tyan S2937 motherboard, and 2 CPUs. I have a drive bay capable of supporting 6 drives, and the motherboard has 6 SATA connectors. I want to setup the system ...
8
votes
1answer
1k views

Recover data from SCSI hard disk

We've got an old server with SCSI hard disk. The server crashed last week and it isn't exactly known what hardware component is damaged. Since the server is due to be retired anyway we don't want to ...
0
votes
1answer
85 views

Why my AWS volume size is different from the actual size?

It's very wried to see my actual disk size is much less than the actual size. From the information, looks this disk is not be partitioned. I have no idea why the actual size is 20G but disk size is ...
2
votes
3answers
65 views

Accessing multiple disks under single virtual partition?

I have disks as below on my Debian server: /dev/sda1 276M 29M 233M 11% /boot /dev/sdb1 917G 793G 79G 92% /home /dev/sdc1 1.8T 1.7T 79G 96% /home2 /dev/sdd1 1.8T 1.7T 79G 96% ...
1
vote
3answers
314 views

How could I recover data from a physically damaged hard drive?

What hardware do I use to recover data from a physically damaged hard drive?
1
vote
0answers
108 views

Are /dev/disk/by-id symlinks unreliable?

I am provisioning a Nova server and Cinder volumes using a Heat template. In order to identify the Cinder volumes attached to my OpenStack server I would like to use the /dev/disk/by-id/... symlinks ...
5
votes
6answers
14k views

How can I tell what filesystems are on a disk in AIX?

I use the tool "topas" to get a quick peek at CPU, memory, and disk statistics on an AIX machine. I understand the numbers on the disk section, but what I don't know is how to tell which ...
0
votes
1answer
66 views

How to generate random files and directories that are scattering across the whole partition? [closed]

I want to perform a heavy test of using "resize2fs" to shrink the file system. Currently, I have script that creates a few hundred thousand files taking several hundred GB. But it doesn't take very ...
0
votes
0answers
85 views

mdadm: can't remove broken drive from raid1

I have a ubuntu server Ubuntu 12.04.5 LTS (GNU/Linux 3.2.0-34-generic x86_64) that uses a software raid with 2 physical drives. Apparently, one drive is unresponsive, and I try to remove it from ...
0
votes
1answer
68 views

Max Size of Disks Supported by Controller

I am interested in purchasing (second hand) a Dell Poweredge 2950 2nd Gen server. However, the specs say it has a max storage size of 4.5tb. I am wondering if this means just what is available to ...
10
votes
2answers
10k views

High disk I/O - jbd2/sda2-8 process

I have run a file server on a CentOS 5.8 final server. My only concern at the moment is what appears to be intermittent but continuous high disk I/O activity causing a general slowdown because of ...
2
votes
1answer
215 views

Why can't a GPT partitioned disk on SATA be read on USB?

If I GPT partition a 4TB disk when it is connected to SATA, then it works fine. If I take the disk and put in the an USB3 enclosure, then I get [root@localhost liveuser]# sfdisk /dev/sdb sfdisk: ...
2
votes
1answer
301 views

How to reacreate the EFI partiton and mirror and existing system partition of an GPT disk?

I have the following setup (very well possible that this is no good practice but it is the given situation): There were 2 x 3TB dynamic GPT disks in a Windows server, Disk0 with EFI (~200 MB), System ...
2
votes
2answers
10k 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 ...
4
votes
3answers
2k views

Convert full hard drive to LVM without external storage

Recently, my 2TB hard drive ran out of space, so I purchased another one to supplement it. My old drive is mounted in a specific folder (does not have system files or anything). Technically, I could ...
4
votes
3answers
4k views

How to stop a linux server from beeping when a RAID HDD has failed

A HDD has just failed on a linux server (Red Hat Linux release 9) we support. Not a big problem since it's on a RAID (MegaRAID SCSI). We're now in the process of getting a new one to replace it. In ...
15
votes
2answers
13k views

How to determine the best byte size for the dd command

I know that doing a dd if=/dev/hda of=/dev/hdb does a deep hard drive copy. I've heard that people have been able to speed up the process by increasing the number of bytes that are read and written at ...
0
votes
0answers
26 views

Hard Drive Recovery; Owned by 1001 and operations block

I'm trying to recover data from a crashed hard drive. I have a SATA to USB cable and I'm trying to pull the data onto a temporary machine. The drive mounts just fine. However, the drive is owned by ...
1
vote
2answers
468 views

Keeping USB backup drive from sleeping while mounted?

Once every few days, seemingly at random, our backup to an external USB hard disk fails on our hp DL380 G5 server running CentOS 6.4 64-bit. If I cd /mnt/backup and run ls it complains ls: reading ...
0
votes
0answers
48 views

IBM XSeries 346 Ultra 320 hdd upgrade options

I recently acquired a IBM XSeries 364 server that I purchased to play around with(still in school), I figured at worst I can use it as a file server or TFS box. Now I realize that this machine was ...
5
votes
3answers
149 views

Shared Disk in modern data center (SAN, virtualization, etc)

I'm a developer...treading here on foreign terrain. Please pardon any naivete. I work on an application that stores data both in a database and the filesystem. Context: Clustering and Network ...
4
votes
6answers
12k views

What is the recommended temperature range for a hard drive?

What is the best temp to keep harddrives running in? I have harddrives that keep failing due to the temp being to high.
6
votes
3answers
4k views

Which is better, Split or Monolithic VMware disk in a production enviroment?

Ok, so I have read a bunch of material on-line and curious as to your thoughts on split vs monolithic disk in a production environment. We are going to be building the VM server on a server that has ...
2
votes
2answers
644 views

SATA 7.2K HD Suitable for File Server

Just discussing a new Server with a client and they are insisting on using two 3Tb 7.2K SATA Driver in RAID 1. I wanted to get them 5 15K SAS Drives in RAID 5. Can anyone tell me what the true speed ...
3
votes
2answers
5k views

Can I increase my Dell RAID 1 from 250GB to 500GB just by plugging in larger drives?

I have a Dell PowerEdge R300 with a Dell SAS 6/iR Internal Controller RAID PCIe and two 250GB SATA HDDs in RAID1 configuration. One of the HDDs has died so I want to swap it out for another. At the ...
6
votes
5answers
3k views

SW SSD Raid 1 over HW RAID 10

A provider(data center) recommended I go with 1TB SSDs in a software RAID 1 over HW RAID 10 with mechanical drives. Their quote: Typically SSDs are most reliable than RAID cards and since you ...
0
votes
2answers
215 views

LSI MegaRaid - Image Drive from Failed RAID

I had a power failure and my LSI MegaRaid 3 disk SAS RAID 0 failed. My attempts to recover the RAID have also failed. I plan to rebuild the array and go with RAID 5 and add another SAS disk. ...
1
vote
1answer
134 views

Touching ZFS volume causing OS to freeze, drives reportedly OK

Having massive issues with 4 brand new 3TB WD Red drives I just got. Trying to setup raidz2 using "native zfs" with all 4 on ubuntu 14.04.1, which works initially until I start trying to copy data ...
1
vote
3answers
14k views

How long does it take to fsck a volume?

We are running a website which is currently serving 3-5 million page views. Our site is a file sharing site and so it contains 250,000 files and few thousand symbolic links. The hard disk is a 1500GB ...
0
votes
1answer
825 views

is it possible to restore a deleted raw partition after a new partition & volume was created

a a raw partition was deleted from a disk, a new partition & volume was created. a bit of data has been written to the volume already. Given the above scenario: 1 - is it possible to restore the ...
0
votes
1answer
214 views

Sql Server 2012 Disk I/O Too high

I am running SQL Server 2012 on windows azure VM Windows server 2012. This is a live Database, about 250GB, with high usage. I applied some best practice articles for the temp-db long ago, and also ...
8
votes
5answers
5k views

Partial-stroking / Short-stroking / Half-stroking Hard Drives?

Could anyone here explain to me what is implied by this term? (I've seen the same thing mentioned with the 3 terms). At first when I read about it, for some reason I understood that it was some way ...
1
vote
2answers
152 views

Install HP drive in Dell PowerEdge 2950?

First, I do agree that what I'm asking here is certainly unsupported by either HP or Dell. I'm just exploring some options here. The scenario: We have a server, a Dell PowerEdge 2950, running SQL ...
5
votes
1answer
184 views

HDD is acting up, but S.M.A.R.T says everything is fine

Before I begin, a quick disclaimer. I'm basically a developer forced into a sysadmin role by circumstances, so I apologize in advance if I say something stupid or seem like I don't know what I'm ...
1
vote
2answers
161 views

ncq not supported on an SATA3.0 HDD in an usb 3.0 casing

is there a well known reason why a SATA3.0 HDD supporting NCQ does not have NCQ queue depth configured when mounted from an usb 3.0 case ? output for hdparm -iI /dev/sda shows NCQ is supported output ...