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

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2answers
32 views

Cloning LVM partitions

I need to clone a CentOS installation from a 1TB disk partitioned with LVM, to several identical machines. The disk is mostly empty since only the operating system and some software are installed and ...
1
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1answer
34 views

Can't mount my hard drive

When I try to mount one of my hard drives, it can't locate the folder with the hard drive. This is the output for the command df: Filesystem 1K-blocks Used Available Use% ...
0
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1answer
17 views

Munin disk utilization calculation.

I have got intel ssd(series 530, 480gb). Data from intel site: Sequential Read - 540 MB/s Sequential Write - 490 MB/s Random Read - 48000 IOPS Random Write - 80000 IOPS Current load is about 5000 ...
2
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1answer
57 views

Mounting degraded RAID

I've finally managed to assemble my RAID10 array again. I'm hoping there might now be a way through this. (There is history, if anyone is interested). I'm now getting: # cat /proc/mdstat ...
1
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0answers
168 views

dd from /dev/zero to /dev/sda does not overwrite the whole disk [migrated]

I issued dd command to zero out my hard disk. The command completed successfully but only part of the hard drive was overwritten: mint@mint ~ $ sudo dd if=/dev/zero of=/dev/sda dd: writing to ...
2
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0answers
20 views

Bus error with read-only file system on 9 out of 13 machines [migrated]

Machines are just hanging. I can't reboot with sudo reboot, because it gives me bus error. I see the message about read only file system and this kind of messages in dmesg I can guess that the ...
1
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1answer
23 views

Is it ok to mkfs and mount the whole disk without partitionate

[root@VM_xxx_centos ~]# df Filesystem 1K-blocks Used Available Use% Mounted on /dev/vda1 8255928 7068948 767604 91% / /dev/vdb 516061624 5966928 483880296 2% /data2 As you ...
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2answers
68 views

Does this hard disk match with the HP ProLiant ML350 G5?

I've got an offering for the 300 GB SAS 10K 2,5" hard disk. Will this fit in my HP ProLiant ML350 G5 server. The description in the manual isn't that clear. I'm just don't want to buy something that ...
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2answers
35 views

defrag /x - consolidate free space not really working - W2K12

I am trying to shrink my 300GB partition. There is just 50GB used. So I used defrag c: /x which should consolidate free space ("Free-space consolidation is useful if you need to shrink a volume, and ...
0
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0answers
26 views

Defunct Disk Drive (DDD) in IBM ServeRAID 6i, RAID5 array

My RAID 5 array is "Critical (CRT)" Status, since one of its six 146GB 10k rpm is marked as defunct. Is it possible to replace the defective disk (FRU part number 32P0731) with a similar HP disk ...
0
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0answers
41 views

Popped in replacement harddrive in RAID 1 configuration; Seeing I/O but the drive is not recognized by OS or RAID controller

CentOS 5.11; Dell PowerEdge R410; Dell SAS 6/iR Integrated Blades RAID Controller. Have two drives, both in a RAID 1 array. First drive failed. Pulled it out and popped in a new drive (same brand ...
1
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3answers
120 views

Hard disk / SSDs - detection and handling of errors - is silent data corruption reliably prevented?

When an error occurs on a drive, is it correct to assume that it will always be detected and reported to the OS (if software RAID such as mdadm) or RAID controller (if hardware RAID) as a failed read ...
1
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2answers
33 views

Having trouble mapping solaris drive paths to physical disks

I have a supermicro box with 24 drives in front and 12 drives in back. It's running x86 solaris 10 with zfs. Here is the output of zpool status: NAME STATE READ WRITE ...
1
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3answers
125 views

Migrate SAS disks from E200i to B320i Smart Array

I have an older HP ML350 G5 series server with 4 SAS 72GB hdds in RAID 0+1. It's down and beyond repair. So I was wondering would it work if I was just to plug those in newer server with B320i RAID ...
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1answer
51 views

how to identify which physical drive(s) correspond to an entry in /etc/fstab [duplicate]

Using Centos. Situation: I have multiple drives off of two RAID controllers. I also have multiple entries in the fstab, such as /dev/sdb, /dev/sdc, etc. What I need to know is how I can identify ...
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0answers
34 views

Replacing a HDD in FreeNAS

I got a message that said one of my hard drive was degraded and im trying to figure out how to check which drive it is. I did zpool status and I got this zpool status pool: BiggyD state: ...
0
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1answer
74 views

SAS-3 vs SAS-2 HDDs

What are the main differences between SAS-3 and SAS-2 HDDs? Are there performance differences? Suppose we are talking of 10k rpm disks, ~1 TB, in both cases. Regards,
2
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1answer
33 views

Does SAS server rotate always in it's default speed (like 10K, 15K)

I have some concerns about disk throughput in order to plan my SQL Server deployment. I know from experience that consumer SATA disks sometimes go into sleep mode when not used for a longer period. Do ...
0
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0answers
31 views

Mount LVM volume as external usb drive?

I'm trying to mount my old 2x500GB drives to the new server which has the same drive volume. Both have LVM structure but it's not working. root@server [/mnt/usb]# ls /dev/sd* /dev/sda /dev/sda2 ...
0
votes
1answer
42 views

Can I recreate a unit from a single drive RAID1 in a 3ware Raid controller?

I have a broken server and a broken disk on that same server on a RAID1 setup. I need to setup this same RAID unit, now on a new server, and from only 1 drive (since the other is broken). I moved ...
5
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2answers
199 views

raid controller data transfer rate

I'm going to buy an 8-port raid controller for which the declared data trasfer rate is "Up to 6Gb/s per port". The declared connectors are "Two mini-SAS SFF8088". The maximum number of supported ...
0
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0answers
18 views

SAR returns 0 await, 0 util for mdraid volume

Trying to get a picture on what is going on with the disks in our environment, I'm gathering statistics using SAR. Why does "sar -d" return "0" for the await and util for an mdraid volume? I can see ...
0
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1answer
87 views

FreeNAS is getting Uncorrectable parity/CRC errors

In my FreeNAS 9.3 installation I am getting more and more Uncorrectable parity/CRC errors (like these here: May 15 13:39:41 freenas (ada1:ahcich1:0:0:0): READ_FPDMA_QUEUED. ACB: 60 00 b8 0e 18 40 91 ...
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3answers
163 views

Windows Server 2012 R2, having unexpectedly low disk performance or fault [closed]

We're a student association which have purchased an dedicated server to host game servers and similar. The server seems to experience occasional Disk-I/O bottlenecks. This is especially true when ...
2
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1answer
81 views

Are RAID 5 systems suitable for larger disk sizes?

Why is it generally considered that RAID 5 systems are not suitable for larger disk sizes? Is the same true for RAID 6?
1
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2answers
50 views

Error: Filesystem is read only

I've been having trouble with a debian system's file system going into read-only mode. The short solution was to turn it off and back on again, but it keeps switching over to read only mode. The ...
0
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0answers
46 views

MySQL slow file I/O

I got a little issue with MySQL having slow file IO. When benchmarking 1k blocks (I did them on purpose that small for worst-case) I get an hdd speed of about 2MB/s. When looking at iotop while ...
3
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1answer
45 views

Bitlocker device name change

When imaging our PCs we generally create a temp name for our facilities to change the device name to whatever particular department fits their needs. The issue is we can't send out any devices without ...
5
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1answer
95 views

Getting Error: “No space left on device” for a particular filename

I have a ext4 volume with lot of files inside a particular directory. Whenever I am trying to create a file inside it of a particular name, I am getting "No space left on device" error. $ touch ...
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votes
1answer
50 views

Storage displayed discrepancy from actual hard drive

In our ubuntu 14.04 server we have a 1TB Hard drive. The hard drive is displays as 998GB with 1% usage, however, with PHP software such as owncloud, it is only displaying 19GB of storage available. Is ...
1
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1answer
36 views

What is the purpose of a ramdisk when fadvise exists?

My understanding is that fadvise will tell the system that the indicated files should be stored in the file system cache (RAM). What is the purpose of mounting a directory in a ramdisk when you can ...
4
votes
2answers
134 views

99% disk IO spikes with Percona

So we have a server that has seemingly random spikes in disk I/O, going up to 99.x% at random times and for no obvious reason, staying high for a while, and then going back down. This didn't use to be ...
2
votes
2answers
123 views

Why does a ZFS resilver scan the entire pool?

I have a zpool where I have just replaced a failed disk, and started a resilvering to the new disk. What I don't understand is, why zpool status says it want to scan 129TB, when the size of the vdev ...
1
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0answers
55 views

How do I interpret a very high Avg. Disk sec/Write perfmon value?

Short version: Is the perfmon screenshot shown below enough evidence to say "something is wrong with your storage system"? Long version: I am debugging a performance problem: Some SQL Server query ...
0
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0answers
13 views

IAAS hard disk storage transfers: Moving a GCE persistent disk to an AWS EBS disk?

Is there a way to export a Google Compute Engine persistent disk to an AWS Elastic Block Storage? Basically, they are both hard drives, so I wonder if there is a way to export one to the other. If ...
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votes
3answers
121 views

SSD hard drive compatibility with Dell 1U and Supermicro 1U [closed]

I have a Dell Poweredge 1850 1U and also a custom 1U Supermicro, both hot swappable drive bays. For some reason, it seems the hdd to ssd drive tray is not working with snapping in. I've used this ...
1
vote
1answer
74 views

Disk errors Event ID 51 on LSI MegaRAID 9240-8i in RAID 1

I am working on a case of recurrent disk errors. Server is running Windows Server 2012 R2 Standard. There are two main disks on a mirrored RAID. There is also an additional drive that is used for ...
1
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2answers
62 views

Measuring external hdd's rough handling

An external USB hard drive periodically travels to and from my facility to update its files (it's for offsite backup). HDD, not SSD. How can I measure if it's being handled too roughly? I'd rather ...
0
votes
1answer
66 views

S.M.A.R.T long self test. Does the test continue after finding bad blocks?

I've been watching a SMART enabled HDD closely recently (connected to an OSX Server, which is not very helpful with SMART output out of the box). The drive is definitely failing- the heads click, ...
1
vote
1answer
116 views

copy LVM partition to new disk

I have a question about making copy of LVM partition to new disk. I want co copy not to move data. My operating system is Debian. On LVM partition I have running Xen virtual systems. Information ...
9
votes
3answers
860 views

Why are Large Form Factor (LFF) disks still fairly prevelant?

Small Form Factor (SFF) / 2.5" disks seem to have become more popular than LFF disks now due to them being preferable over LFF disks in many scenarios (lower power consumption, higher density, etc). ...
0
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0answers
11 views

How Do I Securely Delete External Hard Drives Such as Western Digital MyBook? [duplicate]

I have server external drives in Windows, mounted as a drive letters, and I would like to securely wipe it for the purposes of reselling. Normally, I'd hook it up to this ...
0
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2answers
39 views

Is disk's UUID a good identifier for disk?

My tool working among 100 disks, some of them may attach or detach from the server during the tool running. I want to use disk's UUID as disk's id, and I got the question: If some disk disk_1 got a ...
0
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2answers
211 views

Server 2012 R2 System Disk Filling

This is a bit of a strange issue - the usual troubleshooting steps don't seem to apply. On a XenServer 6.2 host (with SP1), I have a guest VM that is running Windows Server 2012 R2 that functions as ...
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0answers
111 views

hp proliant microserver not detecting hard drive

So, I've hit a bit of a wall with the HP Proliant Microserver N40L. I'm trying to install a new hard drive, 4 TB, but it's not being detected by the BIOS and thus, not the OS either. It just spins up, ...
0
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2answers
77 views

Grow individual drive size in RAID5 array

My array is built of 3 hard drive of 2TB, I have 2 more free space and I would love to start to grow my array with 4TB hard drives, if I start to put 2 4TB hard drives and eventualy replace the 2TB ...
0
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1answer
204 views

Ubuntu remount a root mount that's changed to ro as rw without rebooting

Because of errors=remount-ro an underlying NFS blip caused my root mount to be remounted as read-only. I know there is nothing wrong I need to worry about. How can I remount this as rw without ...
1
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1answer
105 views

Prevent HDDs from spinning up before shutdown in Ubuntu/ZoL/SAS2008 environment

I am running Ubuntu 14.04.2 with ZFS on Linux. As I ran out of SATA ports on my Asus M5A78L-M/USB3, I bought a Dell PERC H200 card and crossflashed it to LSI 9211-8i P19 IT mode firmware to ...
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1answer
34 views

Reuse hard-drive from ESXi 4.0 server in ESXi 5.5?

I have a server, which I would like to use in a new ESXi 5.5 server. It was used as a data store and contains VMs we would like to use on the new server. The hard-drive is SATA 3Gb which I believe ...
3
votes
2answers
122 views

Should I be concerned by frequent RAID warning message (unexpected sense - command aborted)?

I have a Fujitsu host (PRIMERGY RX300 S6) running Windows Server 2008 R2 and Hyper-V (Version 6.1) with two virtual servers (one Windows Server 2008 R2 and one Windows Server 2012). Our 25 employees ...