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

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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
13k 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
89 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
vote
1answer
205 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
2answers
692 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
611 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
604 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
25 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
36 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
137 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
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2answers
205 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
721 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
159 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 ...
-1
votes
1answer
61 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
642 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
750 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 ...
10
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
89 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 ...
-1
votes
1answer
346 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
52 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 ...
2
votes
4answers
352 views

Data Recovery Software (Formatted Hard Drive) [closed]

Well... I'd really appreciate your help on this one. It's like this: someone decided to reinstall Windows on his PC, but did not make any backups, and there are a lot of things (well... photos, ...
5
votes
1answer
292 views

Is it possible to calculate where is, physically, a bad block located on a hard disk?

I dd_rescue'd a hard drive, and I know where the bad blocks are. I still have the drive with me, so I can get any information needed from SMART or fdisk. I would like to know if it is possible to ...
-3
votes
3answers
2k views

Configuring RAID in HP Proliant ML350e Gen8 [duplicate]

We have purchased two stock HP ML350e Gen8 servers. Ubuntu 12.04 is to be installed in those. The stock, base unit have provision for 6 hard disks for creating RAID in which, one is filled with 500GB ...
1
vote
2answers
232 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 ...
0
votes
0answers
119 views

External USB drive on xen windows guest

I have an external USB 2Tb drive I'm trying to use with a xen guest. Xen Center 6.1 sees the drive in the removable storage repository and I can assign it to a guest. But the guest (tested ...
1
vote
2answers
53 views

What is the difference between truss -D and truss -E?

I am currently analyzing a command on Solaris that reads from a file and has very low performance. The truss -D commands shows me read system calls taking up to 0.03 seconds, but when I use truss -E, ...
1
vote
1answer
873 views

Does a 3ware “ECC-ERROR” matter on a JBOD when I have ZFS?

I have a FreeBSD 8.x machine running ZFS and with a 3ware 9690SA controller. The 3ware controller shows an ECC-ERROR with one of the disks: //host> /c0 show VPort Status Unit Size ...
2
votes
0answers
799 views

Windows Server Backup [2012 R2] - Went from 100+ copies available to 1 copy available overnight

I'm using Windows Server Backup on a Windows Server 2012 R2 system that has been in production for half a year or so. The server has around 60GB used, and the backup drive is a 160GB external drive ...
0
votes
1answer
200 views

What is the counter type for Linux's /sys/block/$DEVICE/stat

What are the counter types for /sys/block/$DEVICE/stat? $ cat /sys/block/sda/stat 8323741 42381356 464031898 19207478 1940738 49062039 408122282 79935459 0 22315734 99172579 Specifically, ...
8
votes
7answers
11k views

Multiple USB backup targets with Windows Server Backup

I'm trying to add multiple USB external disk targets to a Windows Server 2012 Backup schedule. Having gone through the steps in the GUI to add an additional target, the process fails with the error ...
0
votes
1answer
142 views

PostgreSQL queries slower than before?

I am using PostgreSQL 9.3 server on my production server. Everything had been working fine for the past couple of months. But since the past week or so, PostgreSQL seems to have becomes very slow with ...
12
votes
4answers
19k views

Would SSD drives benefit from a non-default allocation unit size?

The default allocation unit size recommended when formatting a drive in our current set-up is 4096 bytes. I understand the basics of the pros and cons of larger and smaller sizes (performance boost ...
10
votes
6answers
20k views

Linux - Help, I'm running out of inodes!

I have a filesystem that has lots of small files. Currently about 80% of inodes are used (I checked with df -i), however only 60% of disk space is used. How can I 'increase' the number of inodes? If ...
0
votes
2answers
2k views

Increase/refresh the size of the FreeBSD's main partition

I am using VirtualBox and have my FreeBSD mounted on a virtual drive, which recently ran out of space (10 GB) so I have increased the Virtual Drive size up to the 15 GB - started my FreeBSD and its ...
7
votes
6answers
4k views

What causes hard disk failures?

What causes hard disk failures in general. I would like to know the common causes and how to prevent such incidence.
6
votes
3answers
561 views

Is disk serial readable from supermicro chassis?

We are working with a hosting company for managing our dedicated servers. We asked for a replacement disk on one of the servers by providing the serial number. They took out 2 other disks instead and ...
2
votes
1answer
293 views

Is my hard disk failing?

I've just had the hard disk on my server replaced. It was part of a RAID 1 array. The sdb1 partition keeps failing every few hours now. # cat /proc/mdstat Personalities : [linear] [raid0] [raid1] ...
2
votes
6answers
13k views

How many times can you format a hard-drive?

I've read mixed cases all over the place regarding the life of a typical hard drive, and if reformatting degrades the disk. If so, could you measure the life of the disk in a practical manner or ...
0
votes
2answers
588 views

smartctl reports Current Pending Sectors as 2, but a long test doesn't find any errors

The SMART attributes on the drive are: SMART Attributes Data Structure revision number: 16 Vendor Specific SMART Attributes with Thresholds: ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH ...
2
votes
5answers
14k views

Replacing a dead hard drive in RAID 5 with a different type

One of the drives failed in my server configured with RAID 5, and I can't find a exact replacement. From my understanding, RAID 5 supports drives with different sizes. Is this safe? Any ...
0
votes
0answers
54 views

Server drives gives input/output error when formatting in Fedora

I am at a total loss as to why this is happening. I have tried everything I can think of. I am trying to format a drive in Fedora to use in the server. Every time I try to format it I get a ...
0
votes
0answers
166 views

How is it possible for reallocated sector count to decrease?

The reallocated sector count of a disk in a RAID array has been increasing over the past 6 months, but now it seems as though the reallocated sector count has decreased. A month ago (according to ...
1
vote
2answers
2k views

How to diagnose failed drive on server with raid storage controller?

I have problem with one of my Dell PowerEdge R210. Machine is with Centos 6, today system logs started to inform that the hard drive is failing. Jan 6 03:20:12 centos6 kernel: LSI Debug log info ...