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

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1answer
120 views

Finding out which cciss disk is what /dev/sdX disk (smartmontools & cciss raid controller)

I have a HP server, which has a hardware RAID array (that mostly isn't being used for raiding, the disks are just passed through to the Linux OS). I have 6 SSD disks. 2 are riad mirrored together by ...
1
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1answer
45 views

is it possible to move hard disks in raid 5 to pc without raid controller for accessing the information Temporarily?

I want to rebuild my array (RAID 5) for expansion. In the current configuration, I have 3x320GB hard disks giving me about 600 GB usable. I want to replace these hard disks with 3x1TB hard disks ...
0
votes
1answer
85 views

Disk I/O at limit with software raid

whenever I use rm or cp on a bigger file structure the disk i/o is going up to the top, but not with the focus on cp or rm, it is the software raid sync. My knowledge in this area is limited. The ...
3
votes
5answers
9k views

Linux - How to figure out what harddrives are attached?

So I have a server that has a few harddrives in it, all formatted and mounted. However I'm told there is another drive attached to it. How do I find out what drives are attached? How do I find out the ...
0
votes
1answer
626 views

HP Server Gen9 with Gen8 Caddies/Trays

If I have an Generation 9 (Gen9) server from HP, will I be able to use the Gen8 hard disk caddies/trays? For example if I get a HP ProLiant DL180 Gen9 will the old Gen8 caddies/trays still be ...
1
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2answers
2k views

Data Recovery on faulty sata drive that is not being properly detected in Windows

My computer is configured with two sata HDDs. The primary one crashed the other day and now I am trying to recover the data that is on it. I've plugged the faulty HDD into a machine where the primary ...
-3
votes
1answer
349 views

How many hours of SMART power on hours use should a new hard drive have?

Purchased a new HGST hard drive. Using smartctl on OS X the new drive shows 71 hours of power on hours Does this make sense or is this a sign of a refurbished drive? I can't imagine why the ...
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votes
1answer
42 views

Server disk claims to be full, but appears not to be

I have no idea how this is supposed to work. I did df -h and got this result. Filesystem Size Used Avail Use% Mounted on /dev/vzfs 39G 5.8G 24M 100% / none ...
2
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2answers
166 views

HP ProLiant Server HDDs - Buy Spare Parts vs. Retail

sometimes i have to upgrade HP Servers. For example when they get a new "job" to do. So lets say i need some more HDDs for an DL360 G7 Server. If the Server has an active HP Care Pack, does it matter ...
0
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1answer
198 views

Ubuntu 14.04 Cloud Server - Disks gone Read Only

Disks on our cloud server with our web host went read-only this morning for no apparent reason. Following that a reboot to try and rectify the issue resulted in a non-bootable system. Our Web Host ...
1
vote
1answer
874 views

freenas disc problems - smart error - how to repair zfs raid?

I have troubles with my freenas 9.2.1. It crashed today. Its running a fileserver on zfs jbod raid 2. I'm not sure what exactly causes the problems. The system is booting however reacting pretty slow. ...
3
votes
2answers
4k views

Hyper-V - Creating a large fixed disk - EXTREMELY Slow

Hey everyone, after posting another question here, it seems I have to create a fixed disk in order to get one 700GB. I have shut down the machine (which basically has nothing on it), and gone to ...
4
votes
6answers
24k views

How can I convert a logical partition to a primary partition?

I had my primary partitions maxed out but I deleted some and now I want to make one of my logical partitions a primary. Can I do this with gparted or other free tools? Thanks
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votes
1answer
41 views

Are there HDDs which tolerate high ambient temperatures?

For certain reasons I won't go into, I have this small server machine which tends to overheat. I don't have exact temperature measurements, but let's say something like... ID# ATTRIBUTE_NAME ...
0
votes
1answer
276 views

BTRFS, sector alignment and Advance Format Disks

I want to set up a BTRFS RAID1 setup with two WD Red 4TB disks, which possess 4K sectors. Since I am keen to get it right the first time before copying data to it (yes it will be backed up), my ...
0
votes
1answer
644 views

Dell Poweredge 2950 Hard drive size

I recently purchased a Dell Poweredge 2950 at an auction for a very low price, couldn't pass it up. It didn't come with any hard drives so I ordered 5 SATA caddy trays and I am curious what the ...
1
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1answer
486 views

Disk Usage Analyzer on Synology

How can I get an overview of the disk usage on a Synology hard drives like this:
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votes
1answer
250 views

Are disk partition labels or UUIDS stored in the partition area itself or in some other area of the hard disk? [duplicate]

Are disk partition labels or UUIDS stored in the partition area itself or in some other area of the hard disk? e.g If the dd command is used is used to copy the raw partition image from one partition ...
3
votes
3answers
924 views

What are the differences between consumer grade SSDs and the much more expensive enterprise SSDs?

I am in need of a terabyte or so of storage space for Lucene indices on a testing server. I'm having a hard time differentiating between disks like the Samsung 840 evo for about $450 vs SSDs with ...
6
votes
5answers
5k views

Postgres DISK IO very high. What can I do to reduce it immediately?

I'm aware faster disks than what I'm using will help but this will take longer to put in and I am trying to use some emergency measures to decrease disk IO. atop is reporting DSK usage on the red ...
0
votes
2answers
841 views

ESXi sees RAID1 as two hard drives

The server is Proliant ML330 G6. I've activated the embeded SATA RAID in BIOS. Created 1 logical drive in "Option Rom Configuration for Arrays" in RAID 0+1 that consists of two 1TB drives. So in other ...
19
votes
2answers
2k views

In Linux, why isn't superuser root's folder under /home?

You can create a user that has privileges like root, and it's home directory will fall under /home/username. Why does root get its own folder at the top level of the file system? Is this just ...
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votes
2answers
71 views

Why is the BOOTMGR inside of the MBR?

According to the MBR strcuture definitions I have found, the partition table data should be within the bytes ranging from 446 to 510 of the first block of the disk. However, when I run: sudo xxd -g 1 ...
2
votes
2answers
258 views

HP ProLiant ML350 G6 RAID 1 disk compatibility

We are running an HP ProLiant ML350 with a RAID 1 set up on two identical 300GB 6G SAS 10K rpm SFF (2.5-inch) Dual Port Enterprise HDDs and a third acting as a "hot spare" - HP part # HPQ-507127-S21. ...
1
vote
5answers
3k views

Robocopy silently missing files

I'm using Robocopy to sync data from our server's hard disk to an external disk as a backup. It's a pretty simple solution but pretty much the best/easiest one we could come up with - we use two ...
10
votes
4answers
14k views

dd on entire disk, but do not want empty portion

I have a disk, say /dev/sda. Here is fdisk -l: Disk /dev/sda: 64.0 GB, 64023257088 bytes 255 heads, 63 sectors/track, 7783 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size ...
1
vote
2answers
1k views

When reading SSD drive specs, what's the difference between MB/s and IOPS?

I'm trying to find a suitable SSD drive for my database server (postgres on debian 7 amd-64), and I find that for some SSD drives, while read speed is specified in MB/s, write speed is in IOPS. To ...
2
votes
1answer
97 views

“failed command: WRITE DMA” but SMART test says hard disk is OK

Recently I started receiving (in dmesg) such errors: [ 1569.944985] ata6.01: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 [ 1569.944991] ata6.01: BMDMA stat 0x44 [ 1569.944994] ata6.01: failed ...
0
votes
2answers
704 views

How is the average seek of disk estimated given a function to move head to n track

How is the average seek time of disk calculated if a function f(x) is given as an estimate of time to move head of disk to n tracks?
1
vote
3answers
87 views

How do I determine the number of changes made on a given hard disk?

In Windows how do I determine how many bytes have changed on a given Hard Disk??? I don't just mean how many files changed and the sizes of those changes. I mean given a period of time, say 1 hour, ...
3
votes
2answers
632 views

Which part of of a hard drive has the highest throughput, beginning or end of drive?

If I create a partition at the end of the drive does that create the partition on the outside of the platter where the data is passing under the drive heads fastest?
6
votes
2answers
669 views

Determine if C drive has 2 GB of free disk space

I am trying to determine if a target pc has atleast 2 GB of free space. Here is what I have so far: @echo off for /f "usebackq delims== tokens=2" %%x in (`wmic logicaldisk where "DeviceID='C:'" get ...
9
votes
5answers
84k views

Can you use a USB hard drive in ESXI?

I know that you can install ESXi 4.0 on a thumbdrive, but I was wondering if you could plug in an external harddrive to give extra storage to one of your VMs? We run a fileserver inside of ESXi that ...
0
votes
0answers
26 views

Dell PE 830 with updated BIOS - 2 TB HDD

I was wondering if anyone had overcome the small disk limit on this server? Mine does not have a RAID controller and I wanted to install (2) 2 TB drives in it for storage and use the Ubuntu 14.04 ...
6
votes
6answers
3k views

lvremove claims LV to be open

frequently I notice that after a $ sudo lvcreate vg -L 10G immediately followed by a $ sudo lvremove vg/<created volume> I get the error message Can't remove open logical volume "..." ...
2
votes
1answer
38 views

Abstract physical drives to create a resizable raid array: is it possible?

I want to set up two hard drives with a portion of them set in raid1. I want that portion to be scalable too, as logical LVM volumes are. Is it possible to abstract physical volumes or to create an ...
0
votes
1answer
149 views

Unclaimed disk space but no actual physical disk present

I am working with Ubuntu server 12.04 and earlier this week we detected a bad disk in /dev/sdl. I was not able to query its mount point and it also had failed SMART tests. Today I brought a brand new ...
1
vote
2answers
225 views

Performance Tuning Linux [closed]

Performance Tuning/ Monitoring/Latency keeping in mind I see following 4 items & in each item they are lot of tools. CPU Memory IO Network What I see following tools we do use. vmstat mpstat ...
3
votes
4answers
729 views

How to know which block device maps to which physical drive

I have a server with software RAID 1, two hot-swap sata disks. One hard drive started showing errors, I'm thinking about removing and replacing it, only problem is that I have no idea which of the two ...
1
vote
0answers
32 views

(Unexpected?) blkio controller behavior

I'm using docker 1.4.0 with lxc-1.0.6 and cgroup-lite-1.1.5 on Ubuntu 12.04. I have 3 hard disks (/dev/[sdb-sdd]) that I write to from 3 distinct containers. They have only one XFS partition, mounted ...
0
votes
1answer
176 views

Server 2008 - Multiple Event 55 NTFS

VMware ESXi with a virtual server running Windows Server 2008 R2. Event Viewer Administrative Events logs are flooded with the following error: Event 55, Ntfs The file system structure on the disk ...
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votes
1answer
67 views

x3650t ibm hard disk error how to check logs

There is a Led indicator on the front panel of IBM x3650T series, it is blinking lights, most probably there is a Hard disk error but need to be sure... anyone knows how to check the logs on server ...
1
vote
3answers
681 views

Identifying failed hard drive in RAID

I have a server which is running customized version of Debian. It is attached a sun storage raid. It has very limited tools and installing new tools is not allowed. :( This message I see in dmesg: ...
4
votes
6answers
797 views

What are the the potential drawbacks of using non-OEM hard drives in a server?

I'm currently speccing a Hyper-V host for my company and would like to use solid state drives for local storage. The problem is, most oem drives have a hefty premium when compared to retail ...
11
votes
7answers
15k views

Linux ATA errors: Translating to a device name?

When a Linux box gets an ATA error, it syslogs it with a message identifying the disk as "ata%d.00". How do I translate that to a device name (e.g. /dev/sdb)? I feel like this should be trivial, but I ...
0
votes
2answers
105 views

Which value of HDD avgqu-sz is critical?

This is my graph of HDD avgqu-sz from different app machines: App caches data in memory and every n minutes are data flushed to filesystem + every m minutes are data (re)loaded from filesystem in ...
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votes
1answer
382 views

mdadm: add new device failed for /dev/xvdl as 2: Invalid argument

I have existing RAID0 setup with two disks. I have to add a new drive to it. But when I try to run the following command: mdadm --add /dev/md/customer_upload /dev/xvdl I get an error: mdadm: add ...
1
vote
1answer
2k views

MegaCLI causes drive “Other Error”

I am having an issue where running "megalci -PDList -aAll" will cause an Other Error to be logged for 2 of the 6 discs in a pair of servers I have. Here is that again in more detail. I have two ...
38
votes
6answers
3k views

Is my Hard Drive Failing?

I just tried to run a test on my hdd and it doesn't want to complete a self test. Here is the result: smartctl --attributes --log=selftest /dev/sda smartctl 6.2 2013-07-26 r3841 ...
0
votes
1answer
55 views

IBM Fiber Storage

I am asking this question on behalf of the company i work for, What the problem is that we have just setup a fiber storage system with an IBM Server and IBM Fiber Storage system, we brought the both ...