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

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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 ...
0
votes
2answers
51 views

How can 8 SAS lanes support 1024 disks? [duplicate]

According to the LSI 9207-8e specs then it supports up to 1024 disks of 6Gb/s, which I don't quite understand, when it is only an 8 lane JBOD card. In my case, I have an HP D6000 with 70 disks as ...
6
votes
1answer
170 views

Extreme ZFS slowdowns after several months

I've got a general-purpose server, providing mail, DNS, web, databases, and some other services for a number of users. It's got a Xeon E3-1275 at 3.40 GHz, 16 GB ECC RAM. Running Linux kernel 4.2.3, ...
0
votes
0answers
72 views

Is it Ok to spin down Nas4free system disk?

I decided to install Nas4free to an old 15GB HDD rather than to USB flash drive, but the HDD is noisy and draws some power unnecessarily, so I planned to spin it down after system is loaded. When ...
0
votes
0answers
28 views

iostat -En command keep showing a removed disk

I have replaced a disk on a Solaris server (probably wrongly), which have an j4400 array connected. I unplug the disk and put a new one without unconfiguring, disconnecting etc the old one. The ...
0
votes
1answer
42 views

Possible to use internal LSI controllers in HP hosts?

Right now I have a HP ProLiant DL360p Gen8 with two SATA disks in the disk bays. These are the OS disks. I choose SATA disks to bypass the internal raid controller, so ZFS could do the raid. I now ...
0
votes
1answer
45 views

df show wrong output

My df -h output: root@haier-ubuntu:/# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/haier--ubuntu-root 457G 433G 691M 100% / none ...
2
votes
1answer
328 views

Replacing a failed disk HP P2000 SAN - Invalid Metadata

On Friday I had an absolute disaster. I went to the datacenter in order to rack a new server and at the same time, took a new disk with me to replace a drive that had failed a couple of weeks back in ...
-1
votes
1answer
22 views

Are there any two-bay hardware bit/block level replication devices (perhaps RAID-1)? [closed]

Here's what I'm hoping to do: Have two drives in a hardware bay that can be pulled from the front without dissassembly Read and write to it as a single (NTFS) disk Be able to pull either drive and ...
0
votes
0answers
100 views

Mount a Synology hard drive in another Synology

I have a DS112 with a hard drive that started failing. The device cannot boot from the drive. I inserted it into my DS415+. The drive is recognized but has the status uninitialized. When I connect ...
1
vote
2answers
96 views

How to get the attached disk size on FreeBSD

When I attach a disk to FreeBSD I can list any attached disks by doing: [root@freenas] ~# sysctl kern.disks kern.disks: xbd2 xbd1 ada0 [root@freenas] ~# How can I then find out the size of each ...
1
vote
2answers
55 views

allow all users to read/write any files/folders on 2nd drive regardless of who created it in linux

I am running Ubuntu 14.04 LTS. I've got a mount point called /files that is owned by root, the group is plugdev and I've given the group write permission. I used some of the information in ...
2
votes
1answer
42 views

On a VM, do logical vs physical disks still matter?

My brother is using a hosting provider which is providing his company with a VM with Windows Server 2008 R2. They unfortunately have to run the whole stack on one server, so my brother at least ...
-2
votes
1answer
246 views

How can I get drive information for a remote Windows XP machine? [closed]

I need to get the manufacturer or at least the model of the hard disk installed on a remote Windows machine (running Windows XP; I'm on a Windows 7 machine). I know that I can use sysinfo.exe to see ...
0
votes
2answers
26 views

Wiping failed drives with sensitive business information

I have some failed drives that are about to be written off and sent for recycling. Some were members of a RAID 5 array, some I'm not too concerned about wiping information on them, but some of them ...
-2
votes
2answers
151 views

Dell poweredge 2950 and 1950 will not see hard drive [closed]

I am trying to put in a sata drive into my dell poweredge 1950 generation 2 and my dell poweredge 2950 generation 3. The drive is a sata drive which should be supported in my module. I was wondering ...
0
votes
1answer
25 views

lvconvert number of mirrors

I have a logical volume that is mirrored, it has two copies of the data and also its log is mirrored. It was created using something like: lvcreate -m 1 --mirrorlog I am planning to move this data ...
0
votes
1answer
79 views

iSCSI Volume shown as two partitions on disk manager and need to merge/extend

I've just created a LUN and Target on my NAS, the from windows server, used iSCSI initiator to mount it. Disk appears in disk manager Disabled. Using diskpart i remove readonly attrib and created ...
2
votes
2answers
149 views

Powershell script to Inventory File Types

I have been writing a script to inventory drives by specific file types. (AVI, MPG, MP3, etc....) I can get the base script to work using only a set drive and extension, but I would really like to ...
-2
votes
1answer
162 views

>11GB free space, but it says 100% disk usage?

$ df -i /mnt/large_linux/ Filesystem Inodes IUsed IFree IUse% Mounted on /dev/sda1 29376512 1035086 28341426 4% /mnt/large_linux $ df /mnt/large_linux/ Filesystem 1K-blocks ...
0
votes
1answer
86 views

Moving /usr on ArchLinux

my root partition is full, and, by a mistake during installation, my /usr was not splited on different partition. Now, when I move this, configure fstab like following: ...
0
votes
1answer
31 views

Disconnecting a drive during a secure erase

If I issue the secure erase command to a hard drive can I disconnect the drive as long as it remains powered? I am thinking that since the erase is controlled by the HDD's internal controller it does ...
1
vote
1answer
55 views

In centos6.x kvm guest, What is the difference On the following two disk format?

I add a new virtual hard drive vdb to the KVM guest(centos6.5),like this [root@centos ~]# fdisk -l | grep vdb Disk /dev/vdb: 8589 MB, 8589934592 bytes Then,there are two ways to format the disk a. ...
0
votes
0answers
84 views

Replace failed disk in RAID 1

two days ago one of my two drives in my software RAID 1 (that was setup using gnome-disks) configuration failed. I could not access the files in the meantime. After short research it seems that I have ...
0
votes
0answers
14 views

Unable to build RAID on BladeServer HS20 8843-2RG

i have a bit of a problem. We had this Blade Server come in a few days ago, with a seemingly failing disk (the OS cried out IO Error all over the place and only booted into emgergency mode). A quick ...
2
votes
2answers
75 views

mdadm fault injection testing with bad blocks or other unrecoverable errors

I recently lost a drive in my RAID array (and got an email from the system warning me of this, which was awfully nice) and after some drive shuffling and swapping in a new drive I'm all safe and ...
0
votes
0answers
73 views

The RAID array shows up as DEGRADED, but all drives are OK

The current RAID controller I am using is an AMCC 3ware 9690SA-8I SAS RAID Controller. I have just received this server unit used, and going into this blind; I have no idea how long it has been this ...
-1
votes
1answer
47 views

Handling the potential risk of writing random bits to storage during power loss with RAID [closed]

Is it possible for a power failure to cause some part of a machine to write one or more random bits to a storage device? Someone proposed the following idea to address such a risk: create multiple ...
0
votes
4answers
151 views

Can I detect hardware RAID infromation from inside Linux?

When I'm inside of Linux, I can get the following information from lsblk (irrelevant drives removed from output): NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 298G 0 disk sdb ...
3
votes
1answer
91 views

Does hard drive do read verification at the same time it writes data?

As we all know, modern hard disk drives do internal bad sector management inside their firmware, that is, when the drive detects a physically damanged or unreliable physical sector, it replaces the ...
10
votes
1answer
481 views

How can I tell if the server supports hot-swapping drives?

I recently purchased a used server (the type that fits into a rack, rather than a free-standing machine). One nice feature, is rather than having to open up the cover and unscrew the harddrives, this ...
2
votes
2answers
54 views

SAN capable of 25,000 IOPS at 75kb avg. size, where will my bottleneck be?

I just want to double check my findings here, hope someone out there is able to weight in on some of this. Let's say I have a SSD storage array capable of delivering 25,200 IOPS and it is connected ...
3
votes
1answer
284 views

recover highly degraded raid array

I have a Linux RAID6 array (mdadm) composed of 8 disks. 2 disks failed. I replaced them, now I have 2 new empty disks. I would like to rebuild the raid but when I start a raid rebuild, the rebuild ...
1
vote
0answers
38 views

Can I swap out caddie tray to use hard drive with another server?

Supporting legacy (Sun Fire X4100) equipment, looking to purchase drives of higher capacity and/or get better pricing by not limiting my selection to former-Sun hard drives. I've been told that ...
3
votes
1answer
218 views

Is there an OID to retrieve specific HDD partition on SNMP?

I want to get hard disk free space of a specific partition, is there a way to retrieve this with SNMP OID? Is there any special OID for this? EDIT: the OID .1.3.6.1.4.1.2021.9.1.7.1 refers to ...
3
votes
1answer
46 views

SMART self tests - worthwhile if already doing weekly RAID checks and smartctl -a output being monitored?

If a server is configured to check the RAID weekly using /usr/sbin/raid-check and the output of smartctl -a is being monitored, is it worthwhile to also have regular SMART short and long self tests be ...
0
votes
1answer
40 views

HP Blade G6 - Replace original disks with bigger ones

The 2 x 150GB harddrives in RAID1 in the actual HP Blade G6 460c are running out of space. I run MS2008R2 and RDP Sessio Host. I have nought 2 x 450GB drives to use instead. Instead of reinstalling ...
0
votes
2answers
66 views

Monitor for dead disk in linux

I have problem with backups disk that are not part of RAID or anything similar ( so no notifications from raid controller if disk dies). It happens that disk dies completely and only thing that is ...
1
vote
0answers
41 views

Best way to remove drives from MDADM raid array

I have a situation with a RAID array; I'm concerned that the drives in the array are going to fail soon, and given their age, I would rather replace them sooner than later. The problem I have, is ...
-1
votes
2answers
133 views

How to expand a NTFS partition that is in the middle?

I am running into an issue expanding my C:\ drive, which is in the middle and I have carved space before/after it for other stuff. This is a virtual environment (VMware) and the OS is Windows 2012 ...
0
votes
0answers
153 views

LINUX fio random read write Total BW and IOPS calcluation

My fio ouptut for random readwrite is as shown below. Fio was initiated with 3 numjobs fio --name=test_random_read_write --iodepth=16 --rw=readwrite --bsrange=4k-8k --direct=1 --size=2G --numjobs=3 ...
0
votes
0answers
68 views

File writes stall during heavy disk I/O on Linux box

I have two processes running on my box => A and B. Whenever there is heavy disk I/O activity caused by writing large files to the disk by process A, I see that file writes in process B are stalling ...
1
vote
0answers
91 views

HD recognized by BIOS but not Linux or GParted

I have an old (2007) Dell Precision Workstation 690 with Ubuntu 12.04. It has 2 mirrored 139G SAS drives for OS and 2 WD Black 2TB data drives that were formatted ext4 and rsynced and had my virtual ...
-2
votes
3answers
67 views

Difference between 2 hardisks for HP ProLiant server

I have a HP ProLiant server: HP ProLiant DL360e Gen8 Entry I have: 2 hardisk HP SAS 6 Gb/s 7.2 K 8.9cm HP 1TB HDD Now I need to buy: HP SAS 6G 7.2K SFF 6.4cm SC 1TB HDD to install ...
3
votes
2answers
2k views

how to unlock a ssd disk with hdparm?

I have a SSD disk with password protection, but the password lost long time ago... so I tried to earse the ATA security with "hdparm" command. with "hdparm -I", the disk information looks ...
6
votes
1answer
244 views

zfs checksum error in raidz1 vdev but not in disk

I am backing up data stored in a zpool consisting of a single raidz vdev with 2 hard disks. During this operation, I got checksum errors, and now the status looks as follows: pool: tmp_zpool ...
0
votes
1answer
52 views

Safe and beneficial to enable HD disk cache for disks in RAID, or not?

Dell Perc RAID cards (among others) allow you to set the disk cache policy to be either on (meaning, the individual hard disks use their built-in caches) or off (meaning, the individual disk caches ...
0
votes
0answers
118 views

Map USB External HD to Hyper V Server 2012

I wanted to attach a USB external HD to one of my VM. I got Hyper-V Server Core 2012 R2. So I was about to follow any guides on internet (like this one Accessing USB Drives in a Hyper-V VM ), but I ...
4
votes
2answers
574 views

Centos 7 server can't see Disk Array disks

Context I have a server freshly provisionned with CentOS 7, connected to a Disk Array with a Fibre Channel connection. I want to mount the Disk Array's disks on my server's file system, and then ...