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

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What is recommended size of hard disk for a Server?

I have heard that large hardisk >= 1TB are not recommended on the server because they can cause synching issues if one fails + their chances of failure is greater over a longer period of time as the ...
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0answers
5 views

Xenserver has no local storage in raid

I'm using and LSI megaraid 8708em2 controller and trying to install xenserver 6.5. Installing without the raid vdisks worked perfectly but as soon as I setup raid 60 there is no local storage. ...
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1answer
20 views

How/When to physically remove a failing harddrive after replacing it in a Linux RAID?

I have a Linux software RAID-1 with mdadm. Similar to this question ("How to safely replace a not-yet-failed disk in a Linux RAID5 array?"), I want to replace a disk in a the raid. My question might ...
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0answers
44 views

Why is giga bit network fast than disk? [on hold]

Why is fast giga bit network than disk? According to below URL for slide of Dr Jeff Dean, giga bit network is fast than disk. ...
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2answers
50 views

What is the maximum ProLiant DL580 G3 SCSI or SAS drive capacity, and are only HP drives permitted?

I was recently given a free HP ProLiant DL580 G3 configured for SCSI drives from out of a datacenter. I understand that this is an older unit, and reliability may be questionable at best, but in my ...
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2answers
44 views

Hypothetically how many SSDs are needed to assure redundancy? [closed]

If we consider, hypothetically, that a server farm is being designed to have 100TB of storage using solid state drives (SSD), each with 250GB each. My question is how many SSD are needed to ensure ...
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0answers
19 views

mod_fcgid: ap_pass_brigade failed in handle_request_ipc function Fcgid Warning

I have noticed this error cropping up in my error logs, what could be the cause of this: [Tue Jul 21 13:16:06.626541 2015] [fcgid:warn] [pid 24069] (32)Broken pipe: [client 192.0.99.245:31613] ...
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1answer
28 views

Sata Disk very poor performance

I have a HP MicroServer NL54, stock BIOS, with 4 HDs Seagate Barracuda ST2000DM001 2TB 7200 RPM 64MB Cache. If I run a dd benchmark I get: $ dd if=/dev/zero of=/dev/sdb bs=4K count=4096 4096+0 ...
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0answers
21 views

What is the expected AFR and how many SHD are expected to fail per year? [closed]

If we consider that a server farm is being designed to have 100 TBytes of non-volatile memory, using solid state hard drives (SHD) with 250 GBytes each. The technical data of the SHD states that it ...
25
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8answers
3k views

Consumer (or prosumer) SSD's vs. fast HDD in a server environment

What are the pro's and con's of consumer SSDs vs. fast 10-15k spinning drives in a server environment? We cannot use enterprise SSDs in our case as they are prohibitively expensive. Here's some notes ...
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2answers
45 views

KVM Virtual Server Disk Resize on Ubuntu with GParted

We have Ubuntu 14.04 server on KVM with MySQL database which is just close to fill its disk space, which is 80 GB. We have upgraded the server to 160 GB disk, but the problem is that the new disk ...
0
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1answer
26 views

HDD LEDs stopped working after exchanged raid controller in HP DL380 G5

I recently went ahead and exchanged the p400 RAID controller in my HP DL380 G5 server with an LSI HBA card (SAS 9207-8i). I did this to get better disk compatibility, and I didn't need RAID ...
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0answers
20 views

Hard Disk Drive Missing On Windows Server [closed]

Until Yesterday All Was Fine but then suddenly today my One Of My Drives ("E: Drive") is Missing in my computer I Checked Disk Management also not Present there But can view certain files from other ...
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0answers
4 views

Are there risks to encryption of Windows 7 external hard drive? [migrated]

For greater security, I want to encrypt my USB 3.0 external hard drives, to make it harder for Internet or LAN hacker to get at it; or if external hard disk physically stolen. Encryption method would ...
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1answer
42 views

rescan SCSI Disk Without Reboot

I installed/added 2 new disks on VMware. I executed this command and didn't detect any new disks'> ls /sys/class/scsi_host/ | while read host ; do echo "- - -" > /sys/class/scsi_host/$host/scan ; ...
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2answers
109 views

NGINX Serving Large mp4 Files extremely inefficiently

I am currently running nginx/1.0.15 on a Centos 6.6 OS. The server has the following specs: Intel(R) Atom(TM) CPU C2750 @ 2.40GHz (8 cores) 32GB Ram 5 x 6000 GB 7200 RPM (Raid 10) The Problem The ...
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2answers
49 views

Minimum requirements seem to much for a 32 bit application

I am a developer using high level languages like C++ and .NET. One of the external applications I support will be upgraded soon. I have received the following minimum requirements for the upgrade: ...
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1answer
49 views

Why are all drives dropping out of RAID when 1 fails? LSI9260-8i/IBM M5014

I've got an interesting problem I'm hoping you all can help me with. I have an IBM 5014 (the LSI 9260-8i equivalent) running two RAID10 virtual drives. The first is 4 WD RE4's, each 2TB, for a 4TB ...
3
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1answer
40 views

HP Proliant DL360 G6 Logical Drives

I have an HP Proliant DL360 G6 server with 8 HD bays. Currently I have the first two bays working with ESXi and I'm just running RAID 0 on a single drive. This is not a production machine. It has a ...
0
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1answer
27 views

Is a partition necessary when using RAID?

I have configured raid1 on two of my disks. I am not using a partition, because I want to use the entire disk. Is this correct? The command lsblk produces the following output for my disks: sdc ...
3
votes
2answers
66 views

Performance azure disks, high average queue length

I'm having a classic developer-system admin battle where I am stating that there is an IO problem on the disk of the shared sql server while the system admin tells me that the capacity hasn't been ...
3
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3answers
282 views

Infrequent input/output error - Linux server

Once in a while, we encounter input/output errors on one of our disks. Our server (DELL PowerEdge R720, Ubuntu 14.04) uses the Perc H710 Raid controller, and the disk that is producing the error is a ...
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0answers
20 views

Discrepancy between total sectors and calculated total sectors using fdisk

I use ubuntu on vmware. With fdisk command I got this output: Disk /dev/sda: 42.9 GB, 42949672960 bytes 255 heads, 56 sectors/track, 5874 cylinders, total 83886080 sectors Units = sectors of 1 * 512 ...
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2answers
59 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
49 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
33 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
65 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 ...
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1answer
31 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
87 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
52 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 ...
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0answers
48 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 ...
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0answers
66 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 ...
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3answers
158 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 ...
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2answers
41 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 ...
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3answers
145 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
53 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
42 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: ...
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1answer
137 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,
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1answer
34 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 ...
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0answers
41 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 ...
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1answer
44 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 ...
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2answers
208 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 ...
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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 ...
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1answer
122 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
207 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
88 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?
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2answers
61 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 ...
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0answers
51 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 ...
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1answer
54 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 ...
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1answer
112 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 ...