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

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26 views

sg_format 512e to 4096

We have Hitachi 8TB Helium drives, which come in Advanced Format or otherwise known as 512e (4096 native sector to 512 emulated). I want to see if our systems can fully cope with 4096 native sector ...
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1answer
56 views

Error while Expanding Disk Space of virtual machine in Hyper-V server

I have one Virtual machine running on my hyper-v server which has allotted the disk space of 100GB, i have only created C drive in this machine and C drive of this machine is fully consumed due to ...
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1answer
45 views

Full /usr directory, but can only account for 1/8th of space

Having trouble finding the files causing space issues on my server. Running the "df -h" command results in: /dev/xvda1 ext3 4.0G 693M 3.3G 18% / /dev/mapper/vg00-usr ext4 8.9G 8.9G ...
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0answers
53 views

Can't mount SATA drives when moved from USB enclosure to internal

I have had 4 external drives connected over USB to my Dell Precision 490 workstation. They are in /etc/fstab by uuid and formated as UUID. UUID=04c37bff-b93e-440e-acd0-3d984ddb2ec3 /mnt/drive0 ext4 ...
2
votes
1answer
30 views

What happens to GPT Partition after OS Reinstallation

I plan to reinstall a server 2008 OS, but i have other 4TB hard disks (G:,H:,I:)with GPT. Would i loose the GPT config and all the data on other drives after reinstalling the OS on C:?
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1answer
64 views

Which RAID configuration is better for hypervised Virtual Machines with three 300GB SAS drives [duplicate]

Probably a noob question, but I'd like some guidance on which RAID configuration is best in this server scenario. I am aware of and understand the different RAID configurations, but am after guidance ...
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0answers
70 views

Server 2008 R2 does not boot and won't restore

A Server 2008R2 machine was found restarted, asking to insert a bootable disk. I booted from a DVD and tried to restore from a backup image made a day before to a separate HDD (with repartitioning and ...
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1answer
217 views

CentOS 6: SATA link down when scanning for unused drives

I recently inherited a CentOS 6 server with 8 installed hard drives. 6 of these drives were going to be configured as an LVM, but never got that far. The drives are installed and, from what I can tell,...
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1answer
40 views

SMART vs badblocks, who is right?

I have and semi-old hdd (magnetic one, not ssd) and I intended to use it as system drive for my new NAS. So I've run SMART selftest on it and it ended with status "Completed: read failure". However, ...
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1answer
31 views

RAID 10 (2+2) and (4+4) - terminology or physical setup?

I understand what RAID10 (2+2) is (stripped mirror) whereby there are data are striped across 2 groups and each group have a pair of mirror devices (2 disks). This is how i have understand "2+2" For ...
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62 views

Mongodb, we can't go over 100 insert/sec on 200iops HDD

Thanks in advance for your help, we get a strange behaviour in mongodb. So we have a cluster of 20 shards, each composed of 1 master and 2 slaves. This database has a heavy load of write only. However ...
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1answer
27 views

why all hard drives in a HPC cluster must be of the same size and part number? [closed]

One of the hard drives of my HPCC is broken and I have to buy another one. I've heard it must be of the exactly same size and part number. Could anyone explain me why? Thanks
2
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2answers
163 views

How to list basic information about disks (cylinders, heads, sectors, sector size) on Windows 7 and 10

On Linux, fdisk supplies this information without any problems. I can't seem to do the same anywhere in Windows, nor (at a glance) in diskpart which is intended to succeed/replace fdisk. I need to ...
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0answers
28 views

Error on one of four drives, cannot format or read

I'm having weird problems with a small SSD drive, F: (120GB). C:\Users\Administrator>chkdsk f: The type of the file system is RAW. CHKDSK is not available for RAW drives. Server management ...
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1answer
64 views

Incorrect Disk space usage in Linux server [duplicate]

I can see the used disk quota on server is 81G for partition /dev/sda3 mounted to '/' as follows. Filesystem Size Used Avail Use% Mounted on /dev/sda3 106G 81G 20G 81% / tmpfs ...
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0answers
18 views

External drive not recognised and internal disk fills up.

I haven't been able to find anything on this in the interwebs - just guides to repair/fix external drives... In my case, when Mac OS tries to mount the external drive in question the internal disk ...
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0answers
35 views

linux block size - different in different places

When I'm checking block size via: blockdev --getbsz /dev/sda I'm getting: 4096 But when I use cat /sys/block/sda/queue/physical_block_size or cat /sys/block/sda/queue/logical_block_size I'm getting ...
2
votes
1answer
74 views

Storage Space Write cache, and write speed

Hey guys i have been working on my NAS that is using server 2012r2 with storage spaces. the drives are off the shelf 7200 rpm drives the drives are bitlocker encrypted the drives are in a 8 disk ...
0
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1answer
66 views

Is it possible to reset S.M.A.R.T. Spin_Retry_Count?

I have a 20-bay nas that uses Norco 5 in 2 hard drive cages. It's been at about half capacity most of it's life, but I recently added 5 new drives too it and ever since I've just been having sporadic ...
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0answers
25 views

Understanding EC2 disk usage metric

I am running a large machine with 60G RAM and 120G swp on EC2. The performance is not as expected. CPU seems not the bottleneck. I suspect the (ephemeral not EBS) disk IO is the problem. I checked ...
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0answers
65 views

Read only file system after every reboot - centos

Some time ago I got disk full problem and after that everytime I reboot my centos server, the system loads with read only system files. Running mount -o remount,rw / will solve my problem. But ...
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1answer
191 views

HP ProLiant DL180 Gen9 modding/cabling [closed]

I bought a HP ProLiant DL180 Gen9 server in 12LFF drives configuration. Now I'd like to put two additional 2.5" SATA drives inside the case to serve as system drives. As there isn't a default spot ...
0
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1answer
43 views

HP MICROSERVER GEN8 819185-421hard drives not recognized in the front bay

I bought that server and a SEAGATE ST1000DM003 1TB Hard drive. I've installed ubuntu 14.04 LTS on a SD card on the server. It seems that the server doesn't recognise the 1TB hard drive in the front ...
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1answer
47 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 ...
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1answer
29 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
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1answer
87 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
199 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
43 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
29 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
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0answers
49 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
63 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 ...
2
votes
3answers
265 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
votes
2answers
83 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
26 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 ...
0
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1answer
80 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], error(-...
19
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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
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1answer
35 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
31 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
41 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 ata6....
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0answers
14 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
110 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
152 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 ...
2
votes
2answers
176 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
85 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
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0answers
143 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
36 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
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1answer
29 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
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1answer
266 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
691 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
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1answer
926 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 ...