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

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0answers
15 views

How to recover one time formated NTFS partition [closed]

I'm using GetDataBack NTFS usually but I want to hear your oppinions and ideas too. The disk is a standard WD Blue 2TB disk with one partition. By mistake it was reformated (not quick formated) and ...
0
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1answer
13 views

Expanding partition (xfs) of a virtual machine

OS: Ubuntu 14.04, partition table: Model: VMware Virtual disk (scsi) Disk /dev/sda: 37.6GB Sector size (logical/physical): 512B/512B Partition Table: msdos Number Start End Size Type ...
0
votes
1answer
21 views

HP Hard Drive ABC Slots

Ok so I have a hard drive that went out and a replacement drive was ordered per the same part # from the bad drive. On these driver there are 3 slots with tabs on these drives labeled A B C. The BAD ...
1
vote
1answer
39 views

Selecting an SSD to act as boot volume in an HP server

A question I recently asked regarding the use of enterprise 10k vs. 7.2k midline SAS disks led to some suggestions that the use of a mirrored pair of SSDs as a boot volume can make sense because: ...
3
votes
1answer
189 views

Reduce writes from a specific application?

I'm logging the output of a command with command | tee file This causes tee to actually write to the disk every second or so. I'd like to reduce the frequency of the writes, by caching the output ...
0
votes
1answer
17 views

Why my disk elevator is set to “deadline”

I have CentOS 6.x Linux server with kernel 2.6.32-573.8.1.el6.x86_64. I did some checks today and I found that disk elevator is "deadline". [root@srv ~]# cat /sys/block/sda/queue/scheduler noop ...
0
votes
1answer
28 views

How to distribute file storage to a different filesystem with Ubuntu 14.04?

First of: I just got started using CLIs to manage a whole server, sorry if this question is stupid, but I couldn't find any solution to this. I ran into a problem with apt-get -f install, because my ...
2
votes
0answers
29 views

What are the various factors that limits disk read and write speeds and on a network? [closed]

How to choose a server which: has high I/O performance of storage is highly flexible in terms of adding more storage So, basically these servers should act as storage servers for OST in lustre ...
1
vote
1answer
19 views

How to find out raid in linux: cat /sys/block/sda/device/raid_level vs dmraid -s in Redhat?

I am trying to find what raid level and what storage controllers are there in my remote HP server. I can find out the following details which storage controller, size of the disk, model etc. But ...
1
vote
3answers
53 views

How to automatically detect inserted SATA disk in Solaris if cfgadm status is disconnected?

My goal is to automate a backup routine on a small OpenSolaris NAS (running OmniOS + napp-it on a HP Microserver N54L) in combination with SATA disks. Background: I have installed one of those 5.25" ...
0
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0answers
19 views

Does the backplane on an HP server have any impact on the speed of the drives?

I have an HP Proliant DL380 Gen7. The server currently has no drives and is running on the integrated smart array controller. I was looking into replacing the controller with an LSI-9211-8i controller ...
0
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0answers
14 views

zfs Disk in pool accidentally pulled now shows pool degraded

I have a pool with 10 disks and we accidentally pulled the wrong disk and now the pool shows degraded, and suggests using zpool recover. Can we just "zpool scrub sdbe" to get the disk resilvered and ...
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0answers
19 views

Grub Rescue, always getting unknown filesystem

After launching fsck command and rebooting a Debian server, i run into grub rescue mod. So am trying to recover my system but with nothing when i execute ls i get : (hd0), (hd0, msdos5), (hd0, ...
0
votes
1answer
33 views

iSCSI opcode[89], error(-65539)

I have error iSCSI target (Synology DS1813+) used as NAS: Jan 19 12:03:55 SRV1 kernel: [23311947.266497] iSCSI: iSCSI: EPIO[/volume1/@iSCSITrg/iSCSI_3_Extent_LUN-LUN1_000], opcode[89], ...
19
votes
3answers
2k views

Can “enterprise” drives be safely replaced by near/midline in some situations?

When specifying servers, like (I would assume) many engineers who aren't experts in storage, I'll generally play it safe (and perhaps be a slave to marketing) by standardising on a minimum of 10k SAS ...
0
votes
1answer
24 views

Bit copied a disk image using the dd command to a new and bigger disk. How do expand whole LVM? [duplicate]

I just copied a 50 GB disk image using dd for bit copying to a new harddisk with 200 GB storage. On the disk is LVM including the system partition EXT4 and a swap partition (both LVs). Well the copy ...
1
vote
0answers
26 views

Is my drive good or going bad?

I just ran SMART on my server's drives but I'm not too sure how to interpret it. My results seem like the drive is doing fine, but I would like a second (or third) opinion, just to be safe. Here are ...
0
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2answers
29 views

Ran smartctl on my drive, not sure if this is good or bad

I've been having problems with a drive in my Synology diskstation. I saw the following errors pop up on my /var/log/messages: ata6.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen ...
0
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0answers
13 views

Best practices for sizing RAID 6 arrays? [duplicate]

I'm wondering what the best practices are for sizing raid 6 arrays. For example: At what point is it better to use multiple arrays or RAID 60? is spindle count the only factor? If reliability is ...
1
vote
2answers
45 views

ESXI 5.5 Doesn't see full hard drive

I have an ESXI 5.5 host which I've had up for a while (whitebox build) and I've recently replaced one of the internal hard drives due to failure (not raid, directly connected to the SATA controller). ...
0
votes
2answers
79 views

Is it documented anywhere that adding a disk to a Azure VM causes an unconditional reboot?

I've noticed that adding a new disk to an Ubuntu 14.04 VM running on Azure, caused an unconditional reboot of the Azure VM. When I added a second disk, the VM wasn't rebooted, but the first disk was ...
1
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2answers
162 views

Does any SATA drive work in any SATA port?

I was under the assumption (apart from restrictions due to old operating systems not being able to read large drives) that as long as a hard drive was of the same type as what is available for the ...
2
votes
1answer
31 views

Reliability of S.M.A.R.T. Selftest

I let smartd check my hard drives regularly. Recently I have been notified about a failed short selftest on one of my hard-drivers. smartctl 6.4 2014-10-07 r4002 [x86_64-linux-3.16.0-0.bpo.4-amd64] ...
3
votes
0answers
61 views

What causes SCSI command timeout over 30 seconds?

System description: CentOS 7. SuperMicro X9DRW-iF board. Latest BIOS (and SCU option ROM), using SCU option ROM. Four 300GB WD HDDs connected to the board's SCU. Six HDDs connected to the six ...
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votes
1answer
22 views

External Drives on RAID/LVM configuration

I had 2 drives corrupted and now replaced with new ones sitting on RAID 0. After installing the new drives I have attached the 2 old corrupted drives via usb to retrieve data from them. These 2 drives ...
0
votes
1answer
24 views

Backup old disk to external disk (new)

One of the 2 x 500GB drives on server is crashed can read but not write the data, which both are on Hardware RAID 0. So I connected an external 1TB new drive to backup the data and replace those 2 x ...
0
votes
1answer
39 views

Interpreting /var/log/messages output after server freezed

My server freezed. I restarted, and after running fsck manually, services restarted normally. I'm analyzing /var/log/messages around the time of the fault, and I found these entries: Nov 29 22:24:27 ...
16
votes
1answer
643 views

Why does `df` indicate no available space when used is much less than total size, on my VPS? [duplicate]

My VPS display this with df -h Filesystem Size Used Avail Use% Mounted on /dev/simfs 100G 46G 0 100% / Does anyone have a idea to fix this ?
0
votes
1answer
142 views

S.M.A.R.T. error , 190 Airflow_Temperature_Cel , Is it a risk?

Please, I received this report by S.M.A.R.T Checking /dev/sdb.... Errors: Please note the following marginal Attributes: ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED ...
0
votes
1answer
39 views

mdadm: can I reconnect a USB disk as SATA without needing a rebuild?

In my server there's an mdadm RAID-1 array consisting of two SATA disks, named sdb and sdc. The sdb disk might fail soon (according to SMART data), and I want to replace it with a newly bought disk. ...
0
votes
1answer
39 views

DegradedArray event on /dev/md2

I am getting the following error on my Proxmox server. It has happened multiple times over the last few days now. How am I able to test if the RAID hard drive is faulty? This is an automatically ...
2
votes
1answer
87 views

How to see disk usage graph on Windows Server 2012

I experience a huge slow-down on server. And the more I inspect, the less I find out what's going on wrong there. I think it might be related to I/O. On local PC, I can open Task Manager, and see the ...
0
votes
2answers
37 views

80 pin SCSI Raid Controller to SATA SSD's on IBM e336

I have an Old IBM e336 1U Sever. Currently the only Hard drive in the system is a Ultra160 SCSI drive. This drive is old and making some noises indicating that its life is going to end soon. Though ...
2
votes
1answer
204 views

HP Code 341 “Physical Drive State: Predictive failure. This physical drive is predicted to fail soon.”

this is my first post so bear with me here :-) Background: I have a RAID5 setup with 4 disks that have been working perfect for years. After one drive failed, I installed new drives which where ...
0
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0answers
19 views

Hot Swap Disk With One Disk Failed and One Predictive Fail in Same Array

I have a RAID 10 Array sitting on a HP Smart Array P410i controller. One disk has an error status and one has a predictive failure status. Is it safe to replace the predictive failure disk and then ...
1
vote
1answer
31 views

Our app lags “randomly” due to Disk I/O issues?

We have made an app that requires hundreds of images downloaded for each user every day. Our basic server setup is as follows: Loadbalancer -> Nginx -> Databaseserver However, our app "randomly" ...
1
vote
1answer
53 views

ZFS on a single external HDD drive: setup / tutorial and workflow [closed]

There are many tutorials on ZFS but I couldn't find a single one which covers the changes in commands when one uses only a single drive. I know by now that the parameter copies=2 is used but what ...
1
vote
0answers
19 views

What steps to follow new disk space is added to linux platform? [closed]

I am trying to learn linux environment. I have a VM based on RHEL 6.6 64-bit. One of system engineers told me he added 20GB disk space to the VM. If I want to use that disk space properly what steps I ...
0
votes
1answer
26 views

Change partitions of disk with RAID and LVM

TL;DR: How to combine RAID + LVM partitions online (not touching rootfs)? I have a server which was used for something else before and had a certain partition structure create. df -h shows ...
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votes
1answer
55 views

I launch stress-ng -d 9 and my server crashes

I'm trying to understand why my server crashes. It reboots itself after some minutes when launching stress-ng -d 9 The last logs I received are these ones: [pid 1547] write(3, ...
2
votes
1answer
165 views

Can I effectively clone my hard drive by using mirrored partitions in Win Server 2008?

I have a server running Win Server 2k8 R2 Foundation, functioning as a basic file server and CAD software licensing server, with the following situation: Originally installed with 2x 250GB physical ...
0
votes
0answers
29 views

ZFS and controller level mirroring

If there are more than one SCSI controllers on your machine - there are disks from each controller - is there an option within ZFS to create a mirror of an existing pool so that sub mirror is picked ...
2
votes
4answers
160 views

Erasing Server RAID Hard disks (SAS and SATA) for decomissioning

We are in a process of decomissioning a handfull of Fujitsu Primergy Servers. Before of course, we want to make sure that the hard disks are completely wiped out. But it seems there is no way to ...
1
vote
0answers
16 views

M5015 Disk controller - Replace failed disk used working disk

I have an IBM X3200 M3 machine with a M5015 SATA Disk controller (RAID 5). One of the disks has failed ie orange light flashing on the disk. I intend to replace the damaged disk with a used disk of ...
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votes
3answers
50 views

CentOS 7 server rebooted itself into rescue mode - how can I find out why?

I've switched it back to regular boot and it seems to boot up fine. So why did it reboot? Running "last" doesn't even show a log OF a reboot. What does that suggest? When I try "smartctl -a ...
2
votes
1answer
52 views

How to disable automatic garbage collection on an SSD?

Solid State Drives (SSD) have a garbage collection functionality which makes space from deleted files available. It is triggered automatically by the drive via a TRIM command sent by the OS Is ...
0
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1answer
111 views

How do I clone a single drive onto a new RAID 1 array?

Here's a little background on the situation at hand. I have a DELL Precision T7600 at work that I'm responsible for maintaining, which just lost a hard-drive, thankfully just the /home directory was ...
3
votes
3answers
172 views

What's the top normal S.M.A.R.T. temperature for HGST Helium Ultrastar 8TB 7200 RPM SAS 12Gb/s enterprise drives?

I've just received new Dell R730xd 2U server with faceplate 12 * 3.5" drive bays + 4 * 3.5" mid-body tray, located above RAM modules & CPUs. I've plugged 16 * HGST Helium 8Tb 7200 RPM SAS 12Gb/s ...
24
votes
2answers
2k views

What does SMART testing do and how does it work?

man smartctl states (SNIPPED for brevity): The first category, called "online" testing. The second category of testing is called "offline" testing. Normally, the disk will suspend offline ...
35
votes
2answers
2k views

Unable to write to disk but disk isn't full

I am using Ubuntu 12.04 and can't write to any file, even as root, or do any other operation that requires writing. Neither can any process that needs to write, so they're all failing. df says I've ...