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

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9 views

how to filter sar -d disk output tidily

sar -D output-I would like a suitable command to run alongside stress -hdd but this is the output which sar -D 1 10 gives. I have filtered it using both awk |'NR > 1 {printf ...
0
votes
1answer
26 views

Unable to get SMART metrics from Seagate Disks on Debian OS

Referring to the question here, I too am trying to get all attributes out, as explained in this blog here. I am using Debian 6 as OS, and installed smartmontools version 6.3 using apt-get. My 6 disks ...
0
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0answers
21 views

Apache slow page load - cache / RAM drive / SSD issue? [on hold]

I've migrated recently from CentOS 6.4 to CentOS 7 on our server and I've got small problem (however probably not system related), this is my configuration for both systems: System 1: CentOS 6.4 ...
0
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0answers
21 views

Hyper-V Machine harddisk full, but not so

My virtual machine is having harddisk issues, at least that is what Hyper-V says. The VM has 20 gb available and is running ubuntu 14.x server. Its current usage is 4.7 GB and hyper-v pauses it time ...
1
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1answer
36 views

Convert RAID from Mechanical Disks to SSD?

Any issues with converting a Mechanical Disk RAID to SSD by replacing the drives one-by-one? I couldn't find anyone online who has done this, so let's make this the place to post about it. If you ...
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1answer
36 views

How can I resume a dd operation after a “error writing in file” status?

This command produced the error mentioned above after 9 h (preparing a 2 TB hdd for encryption): time openssl enc -aes-256-ctr -pass pass:"$(dd if=/dev/urandom \ bs=128 count=1 2>/dev/null | ...
0
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2answers
56 views

Dell RAID controller and 36TB storage [closed]

I've been back and forth with Dell about their RAID cards for a PowerEdge R710 server. So far half the customer service people who I spoke too said it would work, the other half said no. My question ...
0
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1answer
19 views

Recover data from OpenBSD softraid down to a single disk

I'm currently very desperate: I have a 3TB WD Red disk that I need to extract data from. This was part of a softraid on an OpenBSD 5.6 machine. I was in the process of migrating to a zfs on linux ...
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0answers
14 views

Common causes of overheating cpu & hard drive? [migrated]

Wife's laptop is constantly registering higher than normal temperatures for the hard drive and cpu. The fan is working, and is constantly running. The temperatures for the hard drive and each core ...
0
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0answers
13 views

Rebuilding FakeRAID RAID 5 with new disk, no partitions show up, invalid PMBR

I have a RAID 5 array with 4 2TB disks on a HP Z800. One disk failed and was swapped out for a new one. I went into BIOS Intel Storage Matrix Utility and set the Array to rebuild with the new disk. ...
1
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2answers
35 views

Resizing Azure Primary SSD OS disk on Linux

The 29GB of primary disk coming up with Ubuntu 14.04 are not enough for our needs. Also (from what I understood), the attachable disks are not SSD. Is there an updated method of resizing the primary ...
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0answers
13 views

How to boot Windows from new hard drive [migrated]

I just bought a new, bigger hard drive. Currently I'm running Windows 8.1 with a 1TB hard drive. I just bought a new 3TB hard drive and installed it in my computer. Everything seems OK and Windows ...
1
vote
1answer
17 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
35 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
35 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 ...
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votes
0answers
23 views

Ubuntu 14.04: add physical space drive to folder with existing content [migrated]

system: a VPS running Ubuntu 14.04, apache 2.4.7 I added a virtual disk drive to my VPS server. I would like that the OS (Ubuntu 14.04) resides on its own "system" drive, and my clients files reside ...
0
votes
1answer
92 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 ...
0
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0answers
7 views

Share a hard drive for backing up using Mac TimeMachine and Ubuntu System Backups [migrated]

I have a Macbook Pro using Time Machine for whole system backup and a Ubuntu installed on another Macbook Pro (not dual boot) using default system backup. I have a 4TB SATA hard drive partitioned ...
3
votes
0answers
39 views

Why is my HDD partition a character special device?

I have a bunch of old 1T disks with an mdadm array on them. They had been out of commission for awhile, but yesterday I slotted them into a server running an up to date Debian Jessie. Eventually I ...
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votes
1answer
35 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 ...
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votes
1answer
81 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 ...
8
votes
2answers
99 views

Are there any notable advantages (or disadvantages) to using EFI firmware and GPT boot disks in an ESXi environment?

My basic question is, as the title asks: are there any notable advantages (or disadvantages) to using EFI firmware and GPT boot disks in an ESXi environment? By "notable," I mean anything other than ...
0
votes
1answer
74 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
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1answer
61 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
195 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. ...
0
votes
1answer
51 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 ...
0
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1answer
99 views

Disk Usage Analyzer on Synology

How can I get an overview of the disk usage on a Synology hard drives like this:
2
votes
3answers
140 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 ...
0
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0answers
49 views

IBM x3950M2 server, no drives detected during windows install

I have an IBM x3950M2 (72236MU) server that was running Server 2012. I decided to swap some drives around and reinstall from scratch with Server 2012r2. However I am unable to get the windows ...
0
votes
2answers
104 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 ...
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votes
2answers
42 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 ...
1
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1answer
32 views

Windows Server 2012 hide external HDD for non-admins

I am setting up a server where people connect to via Remote Desktop. It uses AD DS and uses an external HDD with a share on it for people's data. However when these people log on, aside from the ...
2
votes
2answers
104 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
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2answers
959 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
45 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 ...
1
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1answer
93 views

Determining if there are free slots in a drive bay remotely

I have a server in a rack at a data center I don't have access to, and I want to confirm that there are drive bays open before I order new hardware. There are two specific machines I need to know the ...
0
votes
0answers
20 views

A tool to get disk activity statistics from strace? [duplicate]

So, with strace we can monitor the "file" activity, like the "open", "read" and "write" operations, but is there a tool which will calculate a sum of read and write operations grouping it by the file, ...
6
votes
2answers
440 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 ...
0
votes
0answers
22 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 ...
2
votes
1answer
30 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 ...
1
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2answers
107 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 ...
1
vote
1answer
118 views

IBM X3850 M2 (7233) server hard drives - Novice help needed

We have just bought a used IBM X3850 M2 (7233) server. The plan being to use it for CFD analysis calculations, taking the workload off our workstations. Not being an expert on these matters... Can I ...
1
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0answers
28 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
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1answer
67 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
27 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 ...
4
votes
6answers
562 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 ...
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votes
1answer
150 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 ...
0
votes
2answers
47 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 ...
0
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1answer
40 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 ...
1
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2answers
114 views

Create an MBR on secondary plex

I have a HP Proliant ML350 g6 server running windows 2008 std R2. This server had two hardware arrays in it. One array was a raid 0 with 1 physical drive running raid 0. The other array is 5 physical ...