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

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0
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0answers
13 views

The RAID array shows up as DEGRADED, but all drives are OK

The current RAID controller I am using is an AMCC 3ware 9690SA-8I SAS RAID Controller. I have just received this server unit used, and going into this blind; I have no idea how long it has been this ...
-1
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1answer
26 views

Handling the potential risk of writing random bits to storage during power loss with RAID

Is it possible for a power failure to cause some part of a machine to write one or more random bits to a storage device? Someone proposed the following idea to address such a risk: create multiple ...
0
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4answers
56 views

Can I detect hardware RAID infromation from inside Linux?

When I'm inside of Linux, I can get the following information from lsblk (irrelevant drives removed from output): NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 298G 0 disk sdb ...
2
votes
1answer
25 views

Does hard drive do read verification at the same time it writes data?

As we all know, modern hard disk drives do internal bad sector management inside their firmware, that is, when the drive detects a physically damanged or unreliable physical sector, it replaces the ...
8
votes
1answer
233 views

How can I tell if the server supports hot-swapping drives?

I recently purchased a used server (the type that fits into a rack, rather than a free-standing machine). One nice feature, is rather than having to open up the cover and unscrew the harddrives, this ...
2
votes
2answers
35 views

SAN capable of 25,000 IOPS at 75kb avg. size, where will my bottleneck be?

I just want to double check my findings here, hope someone out there is able to weight in on some of this. Let's say I have a SSD storage array capable of delivering 25,200 IOPS and it is connected ...
3
votes
1answer
263 views

recover highly degraded raid array

I have a Linux RAID6 array (mdadm) composed of 8 disks. 2 disks failed. I replaced them, now I have 2 new empty disks. I would like to rebuild the raid but when I start a raid rebuild, the rebuild ...
-1
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0answers
13 views

I am facing CRC error, How do I repair it and get the files back [on hold]

My data is the drive is inaccessible, how should i fix this error. Is there a way out for this.
0
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0answers
10 views

Overwriting OS disk with dd gives kernal panic error

I am attempting to replace the main hdd windows server OS with Ubuntu Server. However Gparted cannot create a new partition as it is corrupted. end of file while reading argument invalid the primary ...
1
vote
0answers
18 views

Can I swap out caddie tray to use hard drive with another server?

Supporting legacy (Sun Fire X4100) equipment, looking to purchase drives of higher capacity and/or get better pricing by not limiting my selection to former-Sun hard drives. I've been told that ...
3
votes
1answer
65 views

Is there an OID to retrieve specific HDD partition on SNMP?

I want to get hard disk free space of a specific partition, is there a way to retrieve this with SNMP OID? Is there any special OID for this? EDIT: the OID .1.3.6.1.4.1.2021.9.1.7.1 refers to ...
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0answers
3 views

Disappearing Windows Drive space [migrated]

According to my Windows Explorer, I'm running out of space on my C: drive, with only 22 GB left out 517 GB. However, I ran JDiskReport and WinDirStat, each of these shows that the C: drive only takes ...
3
votes
1answer
26 views

SMART self tests - worthwhile if already doing weekly RAID checks and smartctl -a output being monitored?

If a server is configured to check the RAID weekly using /usr/sbin/raid-check and the output of smartctl -a is being monitored, is it worthwhile to also have regular SMART short and long self tests be ...
0
votes
1answer
16 views

HP Blade G6 - Replace original disks with bigger ones

The 2 x 150GB harddrives in RAID1 in the actual HP Blade G6 460c are running out of space. I run MS2008R2 and RDP Sessio Host. I have nought 2 x 450GB drives to use instead. Instead of reinstalling ...
0
votes
2answers
45 views

Monitor for dead disk in linux

I have problem with backups disk that are not part of RAID or anything similar ( so no notifications from raid controller if disk dies). It happens that disk dies completely and only thing that is ...
1
vote
0answers
18 views

Best way to remove drives from MDADM raid array

I have a situation with a RAID array; I'm concerned that the drives in the array are going to fail soon, and given their age, I would rather replace them sooner than later. The problem I have, is ...
-1
votes
2answers
46 views

How to expand a NTFS partition that is in the middle?

I am running into an issue expanding my C:\ drive, which is in the middle and I have carved space before/after it for other stuff. This is a virtual environment (VMware) and the OS is Windows 2012 ...
0
votes
0answers
20 views

LINUX fio random read write Total BW and IOPS calcluation

My fio ouptut for random readwrite is as shown below. Fio was initiated with 3 numjobs fio --name=test_random_read_write --iodepth=16 --rw=readwrite --bsrange=4k-8k --direct=1 --size=2G --numjobs=3 ...
0
votes
0answers
17 views

Adding New Hard Drive to IBM server X3650 M4

This is my first time installing new HDD to a server, I have zero idea how to do this. My Server is running Raid 1 with two 1TB HDD. I am adding two more 1TB HDD into the server. Should I turn off ...
0
votes
0answers
37 views

File writes stall during heavy disk I/O on Linux box

I have two processes running on my box => A and B. Whenever there is heavy disk I/O activity caused by writing large files to the disk by process A, I see that file writes in process B are stalling ...
1
vote
0answers
37 views

HD recognized by BIOS but not Linux or GParted

I have an old (2007) Dell Precision Workstation 690 with Ubuntu 12.04. It has 2 mirrored 139G SAS drives for OS and 2 WD Black 2TB data drives that were formatted ext4 and rsynced and had my virtual ...
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votes
3answers
36 views

Difference between 2 hardisks for HP ProLiant server

I have a HP ProLiant server: HP ProLiant DL360e Gen8 Entry I have: 2 hardisk HP SAS 6 Gb/s 7.2 K 8.9cm HP 1TB HDD Now I need to buy: HP SAS 6G 7.2K SFF 6.4cm SC 1TB HDD to install ...
2
votes
1answer
115 views

how to unlock a ssd disk with hdparm?

I have a SSD disk with password protection, but the password lost long time ago... so I tried to earse the ATA security with "hdparm" command. with "hdparm -I", the disk information looks ...
6
votes
1answer
94 views

zfs checksum error in raidz1 vdev but not in disk

I am backing up data stored in a zpool consisting of a single raidz vdev with 2 hard disks. During this operation, I got checksum errors, and now the status looks as follows: pool: tmp_zpool ...
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votes
0answers
14 views

ProLiant BL460c HDD expansion

I need some help with the following issue. I have ProLiant BL460c Server Blade (G6), with two (2) HDD. (HP SAS 146GB 10K, Model:DG146ABAB4). HDD expansion is necessary, replacing the 2x146GB SAS ...
0
votes
1answer
25 views

Safe and beneficial to enable HD disk cache for disks in RAID, or not?

Dell Perc RAID cards (among others) allow you to set the disk cache policy to be either on (meaning, the individual hard disks use their built-in caches) or off (meaning, the individual disk caches ...
0
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0answers
8 views

How to convert Dynamically Sized VirtualBox Hard Drive to a Fixed size? [migrated]

I have been trying to convert the Dynamically sized hard drive to a fixed size to increase the VM box performance. I tried to follow the instruction on Convert Dynamically Sized VirtualBox VDI Hard ...
0
votes
0answers
27 views

Map USB External HD to Hyper V Server 2012

I wanted to attach a USB external HD to one of my VM. I got Hyper-V Server Core 2012 R2. So I was about to follow any guides on internet (like this one Accessing USB Drives in a Hyper-V VM ), but I ...
4
votes
2answers
126 views

Centos 7 server can't see Disk Array disks

Context I have a server freshly provisionned with CentOS 7, connected to a Disk Array with a Fibre Channel connection. I want to mount the Disk Array's disks on my server's file system, and then ...
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votes
3answers
59 views

how to detect hard disk failure in custom server

We have a custom server with following details: Motherboard Supermicro X8DTL-3 Raid Controller HP Smart array p400(512G BBWC) HDD Backplane Supermicro SAS825TQ 3 Seagate Barracuda HDD with 1TB(Raid ...
1
vote
3answers
660 views

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 ...
0
votes
1answer
34 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 ...
0
votes
2answers
66 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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votes
2answers
54 views

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 ...
0
votes
1answer
44 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 ...
26
votes
8answers
4k 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 ...
1
vote
2answers
79 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
votes
1answer
36 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 ...
-2
votes
1answer
60 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 ; ...
3
votes
2answers
161 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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votes
2answers
50 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: ...
1
vote
1answer
59 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
votes
1answer
61 views

HP Proliant DL360 G6 Maximum 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
votes
1answer
30 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
105 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
votes
3answers
368 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 ...
1
vote
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 ...
1
vote
2answers
139 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
vote
1answer
66 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
votes
1answer
65 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 ...