RAID, an acronym for Redundant Array of Independent Disks (sometimes incorrectly referred to as Redundant Array of Inexpensive Disks), is a technology that provides increased storage functions and reliability through redundancy. -Wikipedia

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9 views

Do I need FIS-based switching for Linux software RAID when *not* using a port multiplier?

I'm planning to build a home NAS with an ASRock AM1H-ITX with four S-ATA disks. According to the manual the board features two S-ATA controllers: 2 x SATA3 6.0 Gb/s Connectors by AMD AM1 Series ...
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0answers
15 views

Get disk serial number by smartctl under raid0 of LSI

I'm trying to get the disk serial number of disks attached to the Centos server. When there was no raid0 (under LSI), I can get the serial number and model of /dev/sdb by: smartctl -i /dev/sdb and ...
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1answer
27 views

How do I prevent Windows from presenting software RAID discs as a single volume?

Here's my issue: I had a server's software RAID fail. I don't believe it's the hard drives, as they are brand new RE drives from Western Digital and the RAID software said that 2 dives had failed. ...
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0answers
12 views

Solaris drive type unknown

I have a server running Solaris 11 with a disk array. I am getting following error when trying to mount the disks indika@server:~# mount /dev/md/dsk/d14 /mnt/storage/ mount: /dev/md/dsk/d14 no such ...
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1answer
19 views

HP DL360g5 RAID controller not recognizing drive bays 5 and 6

I have an HP DL360g5 bios P58. With a Slot 0, HP Smart Array P400i Controller (256MB v2.08) The server originally was running Windows Server 2003 with 2 72GB 15k SAS drives in RAID0. One of the ...
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2answers
29 views

What is RAID 5 write logic with 8 drives running SQL 2008?

We recently had a raid array fail on a SQL 2008 server with 8 x 73GB drives. (Dell 2950). There were two drives that went bad (one had been bad for a few months it seems and was not caught...). To ...
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0answers
4 views

SSD's or HDD's in a LANcache? [migrated]

I am building a LANcache for a lanparty that I'm organizing. We have about 80 visitors (pretty small LAN), but our uplink is limited to 100mb/s due to reasons and it's constantly saturated with game ...
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0answers
16 views

Unable to install grub to software Raid array in Ubuntu

How do you ensure Grub is properly installed on a software RAID array in Ubuntu? I have a failed RAID array on an Ubuntu 14.04 server. When I first tried booting it, the Grub screen came up, but ...
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13 views

How to diagnose RAID drive showing incorrect size

I have a software RAID1 array on Ubuntu 14.04. Each drive has 1TB, for a logical size of 500GB. Suddenly, one drive started reporting it only had 4.1GB and I can no longer run any SMART self tests on ...
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1answer
24 views

How to fix destroyed software RAID after Ubuntu upgrade

I upgraded a headless server from Ubuntu 12 to 14 following the built-in do-release-upgrade script. It seemed to run fine until I rebooted, and was left with an unusable machine. After the grub ...
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3answers
49 views

Can Docker Corrupt a Software RAID Setup? [closed]

I read that software RAID should not be implemented on a machine that also has ESXi virtual machines running. Does this mean that I would want to avoid LVM and or LXC/Docker containers as well on this ...
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1answer
22 views

Data recover hardware raid vs zfs pool

How does one recover data after disk failure in zfs software raid or Synology hw raid? Is it easier , less corruption in one or other ? Is one more susceptible to write corruptions than other ? ...
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0answers
32 views

hp proliant gen8 Microserver read/write for nas and backup [closed]

Does anyone know the read write Mbps speed of network + hdd (non ssd) diskio for gen8 proliant microserver ? It has an hp raid controller , does it work with linux ? I am thinking of using it as a ...
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0answers
18 views

Setting CCTL value of hard disk when using Raid1 [on hold]

I've DIYed a server and use two Toshiba DT01ACA300 (3TB SATA) to run Raid 1 via mdadm. I heard that in order to reduce the chance of hard disk rebuild, I should set enable the CCTL of my hard disk, ...
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2answers
36 views

How do I override grsec?

After a reboot recently, I have a pair of servers that are now unable to monitor their disk status. Nagios reports: HP RAID Array UNKNOWN Error: No controllers detected. -/-/- (LD : []) I get the ...
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0answers
15 views

Windows: serveraid m5000 raid status

I have 4 ibm x3650 m3 servers with ServeRAID-M5000 and windows 2012 r2 onboard. I'm using check_mk plugin to monitor controller, which runs megacli.exe -LDInfo -Lall -aALL -NoLog which returns No ...
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2answers
44 views

Raid Information Through ESXi

I have created a few virtual disks using Raid controller from a Dell server. And then I installed ESXi on the server. But when I view the virtualdisk on the esxi under storage, I see all of them, but ...
1
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1answer
24 views

Rescue mdadm RAID 6 array after three disk events

mdadm 3.2.5, 14 disk RAID 6 Had a drive failure Friday. Two more today in rapid succession. All drives seem fully operational. This is roughly 40TB array, I could use your help please to rescue ...
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3answers
70 views
+50

mdadm 3-way RAID 1 - good solution for guaranteed 2-drive failure tolerance?

Is a 3-way RAID1 using mdadm a good solution to be able to sustain any two drives failing without the RAID failing? I know this costs extra in the sense of only being able to use 1/3 of the disk ...
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0answers
32 views

How do you figure out why a drive is dropping out on a Marvell Raid Controller?

I just got a Marvell SATA Raid controller for my Dell T-410 (the existing Raid card was full 0+1); trying to use it with 2 drives in Raid-1, but one of the drives keeps falling out. The log shows ...
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1answer
104 views

How to load hpvsa.ko (RAID controller B120i) module in Centos 7.1, (seems no longer supported)?

First when RHEL 7.0 and Centos 7.0 was released - I was able to install OS on B120i raid controller by following official RHEL 7.0 and HP docs: First you need to download from HP B120i controller ...
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1answer
95 views

Install Centos 7 or Ubuntu 14.04 on HP DL160 G6

I have recently bought a couple of 2nd hand HP DL160 G6. I have configured the internal B110i in RAID 1+0 (using four SATA disks). When I tried to install either Centos 7 or Ubuntu 14.04 LTS on the ...
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0answers
13 views

An ext4 filesystem spanning multiple RAID arrays and calculating alignment parameters [closed]

So I have the following setup: 3x4TB RAID-5 (Hardware RAID) (two data disks) 5x2TB RAID-5 (Hardware RAID) (four data disks) = six data disks in total? These will be encrypted using LUKS and then ...
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1answer
66 views

Ubuntu Server 14.04 TLS plus Hardware RAID

I have just completed hadrware installation of my new RAID server which will run with Ubuntu Server OS. I have installed Ubuntu Server OS and everything run seemingly without problems. However, I ...
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2answers
60 views

Can you change raid type on an active server?

I was just dabbling with a few different raid types recently for some performance testing and I was hoping someone could answer this question for the sake of knowledge. Is it possible to change the ...
0
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1answer
51 views

RAID1 very slow with LSI card and 2x Samsung EVO 850 drives

not sure if I'm checking it correctly, but here is what I have. Desktop, LSI 9260-8i card, see config below. 2x 500Gb Samsung 850 EVO drives. I also have Samsung 830 drive attached to motherboard ...
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1answer
25 views

Removing RAID-Treating drives independently

I have a server with a 3ware Inc 9750 SAS2/SATA-II RAID PCIe controller. The server has a non-RAID disk for the OS and 4x1TB disks in RAID-5 to store data. For reasons that have more to do with ...
0
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1answer
64 views

What are the Pros & Cons of Software RAID vs Hardware RAID of 4xSSD(512Gig) in RAID10?

I'm getting this server: Supermicro SuperServer 6018R-TDW It comes with this motherboard: Supermicro X10DDW-i I've decided going with 4xSSD(512Gb) in a RAID10. My server is busy with a demanding ...
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3answers
902 views

What are the pros & cons of 4xSSD(512Gig) in a RAID10 vs. 2xSSD(1Tb) no RAID?

Lots of read and write operations that my current setup of 4xSAS15k drives in RAID10 is having made me think of a new fast storage. My server is busy with a demanding database, lots of pages, php ...
0
votes
1answer
60 views

Unable to access QNAP NAS

I have a QNAP TS-879U-RP that is 2.5 years old (Firmware 3.7.1 Build 20120614), installed with 8 HDD (Seagate ST3000DM001-9YN1CC4H). I am having trouble accessing it after an unscheduled shutdown due ...
58
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3answers
6k views

Is it possible to reboot a Linux OS without rebooting the hardware?

Is there a way to reboot a Linux system (Debian in particular) without rebooting the hardware? I have a RAID controller that takes a bit to get itself running before the OS starts up, and I would ...
2
votes
1answer
35 views

HP Server Gen8 Mixed RAID and/or Pass Through

Hello All and thank you in advance for your assistance, I'm considering several HP Gen8 Server models (e.g. DL*e series) for use with WS12R2E. For us, cost savings using a mix of SSD/HDD will likely ...
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2answers
71 views

Is it possible to use Dell PERC H710 on a Dell R710/R610 server?

Dell ships R710 with older RAID card H700 which has LSI 2108 chip and ships R720 with H710 card which has LSI 2208 chip. LSI 2208 is much better with SSDs in terms of performance. I was wondering if ...
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0answers
17 views

Repairing a RAID5 array [migrated]

For a friend I'm trying to repair a RAID5 array, consisting of 3 2TB disks. After working perfectly for quite some time, the computer (running Debian) suddenly wouldn't boot anymore and got stuck at a ...
0
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1answer
14 views

Issue accessing drive from RAID array via USB caddy

I'm having a problem accessing the data from a drive that was in my NAS but is now plugged in via a USB caddy. This drive was not in a RAID array as it was a volume with a single disk. Although it ...
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1answer
91 views

Restore lost RAID1 volume on Synology with mdam

Several days ago I found my DS412+ in fatal state. Volume1 crashed, system volume too. Moreover, Volume2 disappeared from the system! It looks like Volume1 had no free space and cannot transfer data ...
2
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2answers
88 views

RAID 10 Stripe Size for XenServer

Below is our current server configuration. In a few weeks I will be simulating a disaster recovery by installing 5 new disks (1 hot spare) and restoring all VMs from the backups. Will I gain anything ...
1
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1answer
30 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 ...
18
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6answers
1k views

Should I 'run in' one disk of a new RAID 1 pair to decrease the chance of a similar failure time?

I'm setting up a RAID1 array of two new 4TB hard drives. I heard somewhere previously, that making a RAID1 array of new identical hard drives bought at the same time, increased the chance that they ...
1
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1answer
27 views

mdadm: drive replacement shows up as spare and refuses to sync

Prelude I had the following devices in my /dev/md0 RAID 6: /dev/sd[abcdef] The following drives were also present, unrelated to the RAID: /dev/sd[gh] The following drives were part of a card reader ...
5
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1answer
257 views

Expand RAID array on HP Dynamic Smart Array B320i controller

I have a few HP ProLiant DL360e Gen8 servers that are equipped with the Dynamic Smart Array B320i RAID controller. One particular system was shipped with a single disk installed instead of a pair of ...
1
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1answer
19 views

How to rebuild Raid arrays after booting to a live cd?

Problem: Botched kernel upgrade left me with an unbootable system (don't ask me how it also made my backup kernel unbootable) where boot and root are on mdadm raid 1 arrays (with metadata 1.0/1.2 ...
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2answers
41 views

Does ZFS in mirror mode double vdev read performance?

I'm not able to find a clear yes/no answer to this simple question: does using ZFS in mirror mode double the read performance of the underlying vdevs? This applies to either individual requests or ...
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1answer
154 views

synology “disk groups” vs “volumes” clarification

Synology has introduced some interesting terminology with their products that is confusing (to someone used to traditional storage terminology). It appears that "volumes" on Synology is equivalent ...
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0answers
19 views

Partitions not recognized when installing Kubuntu 14.04 over complex RAID setup

I have three identical HDDs. Using a ROM utility, I configured the use of 90% of each of them as a RAID 5 array, and the other 10% as a RAID 0 array. That is, each array uses some area on all three ...
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0answers
38 views

Raid 1 Hard disk failure - Windows 2012 on HP proliant N54L

We have a domain controller setup on Windows 2012 Standard (not R2). We had two raided hard disks. One has failed. This is on a proliant N54L server. Windows 2012 refuses to boot on Raid 1, ...
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1answer
72 views

Can RAID 6 support 3 or more parities? [closed]

It doesn't seem right to me that people are using RAID 1+0, RAID 5+0, or RAID 6+0 instead of using a RAID with 3 or more parities (akin to RAID 6) because the latter has a better reliability given the ...
16
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6answers
3k views

Why is RAID 1+6 not a more common layout?

Why are the nested RAID levels 1+5 or 1+6 almost unheard of? The nested RAID levels Wikipedia article is currently missing their sections. I don't understand why they are not more common than RAID ...
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0answers
19 views

megacli: Failed to alloc kernel SGL buffer for IOCTL

Today one of my servers started sending me alerts about non-optimal RAID state. These were triggered by a very simple script run by cron -- if it detects that not all of the disks report 'Optimal' ...
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2answers
118 views

Monitoring PERC 6/i in vMware ESXi 5.5

I currently have a Dell Poweredge 2950 running ESXi 5.5. My datastore is four drives in RAID 5 configured in the PERC 6/i config utility on bootup. My question is, what do I do if/when one of these ...