Questions tagged [raid5]
RAID (redundant array of independent disks, originally redundant array of inexpensive disks[1][2]) is a storage technology that combines multiple disk drive components into a logical unit. Data is distributed across the drives in one of several ways called "RAID levels", depending on what level of redundancy and performance (via parallel communication) is required. RAID 5 is a specific implementation.
535
questions
1
vote
1
answer
539
views
RAID 6 >80% Highest Active Time with small I/O
I have a RAID 6 with 18 disks. It is used as a storage for small images(5-500Kb). It is about 6TB full of data. I have an utility that reads that images to the ram and then send it over network. I ...
- 13
2
votes
4
answers
17k
views
Slow write Performance with HP H240 HBA using internal Storage with Raid 5 SSD's
I am having a HP Proliant DL 160 Gen9 Server with a HP H240 Host Bus Adapter.
6x 1 TB Samsung SSD's configured in a raid 5 directly using the internal storage of the machine.
After installing a VM on ...
- 1,451
0
votes
0
answers
100
views
RAID 5 keeps failing after recovery
I have configured a raid 5 with 6x2TB devices with mdadm (I shrinked it from 9 devices to 6):
/dev/md0:
Version : 1.2
Creation Time : Mon Sep 23 17:54:25 2013
Raid Level : raid5
Array ...
- 131
1
vote
1
answer
46
views
RAID 5 failure Ubutnu 12.04 not rebooting
I have Ubuntu 12.04 setup with software RAID 5. Dmesg started to show I/O errors continuously. I thought to reboot the system and lo and behold, it got stuck on
GRUB ERROR Loading 21
I then used an ...
- 111
4
votes
5
answers
16k
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 ...
- 699
1
vote
0
answers
404
views
Dell PowerEdge T410 - How do I build additional 3 drive Raid 5 and keep SBS 2011 running?
Dell PowerEdge T410 / Dell PERC 6/i
3 x 1TB SATA in Raid 5 array split as 2 drives
(Drive 0 C: 128GB E:1847GB)
(Drive 1 D: 20GB)
Currently running SBS 2011 Standard.
I would just ...
- 11
-2
votes
3
answers
1k
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 5)...
- 99
1
vote
2
answers
1k
views
Replace Raid 5 HDD with a non empty HDD
Is it safe to replace a corrupt HDD (HDD-A) inside a Raid 5 array (enterprise class hardware) with an almost full disk which contains almost the same data as the corrupt disk (HDD-B)?
Will the new ...
- 113
1
vote
3
answers
3k
views
HP Proliant - RAID 5 array recovery
I searched but found no solution to this question.
I have a HP ProLiant DL385-G5p server with RAID 5, having 4 hard drives: 3*75GB + 1*75GB spare.
One of the 3 hard disks in RAID5 has failed (the ...
- 11
0
votes
1
answer
179
views
Best RAID level for NAS [closed]
I just bought my first computer that I'm going to run as a NAS with OpenMediaVault as OS. I bought two HDD (WD red 5400 rpm) with the capacity of 3TB each (and one 120GB SSD that I'm going to run the ...
0
votes
0
answers
68
views
software 4x4tb raid 5 win 2008 r2 to 2012, server down
I have a server fujitsu econel 100 with 4x4tb in raid 5 configuration (software based with windows server 2008 r2)
now the server is down (PSU and motherboard KO) and I will buy a new machine to ...
- 1
-1
votes
1
answer
101
views
Is it possible to recover a RAID 5 in this case?
Is it possible to recover a RAID 5? After losing the "/proc/mdstat" and run by mistake "mdadm --create --verbose /dev/md0 --level=5 --raid-devices=4 /dev/sdb1 /dev/sdc1 /dev/sdd1 /dev/sde1" instead of ...
- 41
1
vote
2
answers
1k
views
Strange data corruption in Windows Server 2012 R2
I've got a server running Windows Server 2012 R2, OS is in RAID 0 (2x WD Black 500 GB), Data is in RAID 5 (4x WD Red 1 TB) and primarily holds thousands of documents. Since the past week or so we've ...
- 11
1
vote
1
answer
601
views
zfsonlinux, raidz1: two disk corruptions: How I can use dd/dd_rescue and deceive zpool?
I have zfsonlinux (Centos 7), and raidz1. And I have trouble: two disks are dying.
The first disk have Raw_Read_Error_Rate failure in SMART and Reallocated_Sector_Ct error (the disk has run out of ...
0
votes
2
answers
315
views
HD crashed in Synology DS411+ (RAID5)
Today I got notified by email as one HD (out of 4 identical 2TB HDs) in my Synology NAS was "disconnected".
I don't have any physical access to the NAS at the moment, but tomorrow someone will replace ...
- 3
2
votes
1
answer
416
views
Replacing a Self encrypting Hard Drive in an IBM xseries server raid
I have a failed drive in a RAID 5 array in an IBM x3650, Machine Type 7945.
The RAID is composed entirely of original IBM SED SAS drives, 300GB ea.
Unfortunately I am the purchasing Tech, not the ...
0
votes
1
answer
333
views
Recover data from 1 disk after broken raid 5
in a bit of an emergency. I am taking control of some servers that someone else had setup. One of them has crashed and it was critical. Here is what I found:
The server (Dell r710) was operating with ...
2
votes
2
answers
7k
views
mdadm, RAID5 all disks marked as spare, won't start
RAID5 config with mdadm and 4 disks
After some incidents, eg one of the drives was lost, had to reboot the server and rebuild the array, my raid is in a funny situation
cat /proc/mdstat
...
- 231
2
votes
1
answer
239
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?
- 31
4
votes
2
answers
689
views
Extended raid 5 is not expanding
I have a D2700 with 25 1Tb disks with a P421 raid card in a dl360p gen8 HP server.
It was raided as two raid 5 with 2 spare each. I decided to make one raid 5 out of them, deleted one raid and added ...
- 63
1
vote
1
answer
158
views
Remove a drive from a 2-drive RAID 5 array using version 1.2 metadata?
My situation is nearly identical to "How to remove a drive from a non-standard 2-drive RAID 5 array?", except my 2 TB RAID5 is using mdadm super block version 1.2. According to the best answer, "...
- 39
-1
votes
2
answers
1k
views
NAS RAID5 & Crash Scenarios
I need to validate my understanding on RAID.
I'm planning to buy a Synology (or QNAP) NAS and plan to mount 4 HDD (4To each) in a RAID5 group.
I’m considering several crash scenarios :
one hard ...
- 161
0
votes
2
answers
515
views
RAID5 rescue with LVM2 running on it
I have a RAID5-array consisting out of 6 1TB drives. Recently with hardware changes i needed to recreate the raid to rewrite the bootloader on each drive.
Now the problem starts. Starting the Debian ...
- 3
3
votes
2
answers
3k
views
Can mdadm convert a RAID5 to a RAID1?
I have a RAID5 consisting of 3 disks, one of which is broken. I was wondering if it is possible to convert those two disks to a RAID1 without data loss and without having to back-up the data elsewhere....
- 302
1
vote
2
answers
280
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 ...
- 259
1
vote
2
answers
10k
views
QNAP TS-859U+ RAID5 volume unmounted, e2fsck_64 hangs
We got this QNAP TS-859U+ with firmware version 3.8.1 Build 20121205 at our datacenter. It has Intel(R) Atom(TM) CPU D525 @ 1.80GHz processor and 1GB RAM, 8 of 3TB (Seagate ST33000651AS CC44) drives ...
- 11
0
votes
2
answers
203
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 ...
- 11
2
votes
3
answers
22k
views
How to monitor and rebuild hardware RAID in ESXi?
I'm currently putting together some ideas for a new VMHost using ESXi with RAID 5 to replace 3 aging ESXi hosts that have no RAID. However I can't seem to find any good info explaining how to monitor ...
- 139
1
vote
0
answers
99
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 ...
- 1,722
10
votes
2
answers
4k
views
Windows Server Backup Error - Volumes Larger than 16.7TB cannot be protected?
I'm trying to use Windows Server Backup to backup a RAID array on my new server. But, when I do, I run into this error:
The server is running Windows Server 2012 R2 and the array in question is 20TB ...
- 300
1
vote
1
answer
126
views
RAID-5 how can I guess how many disks was member?
We have a server which we inherited from previous sysadmin. Now the RAID-5 (H/W based on IBM ServeRAID) now unusable, saying not enough disks to operate.
On ServeRAID Manager I can see three physical ...
- 269
0
votes
3
answers
1k
views
PERC H310 Raid 5 - Fault - Turn array into RAID 0
Yesterday one of the three Raid 5 disks I have configured into my DELL Server PERC H310 controller cannot be found anymore.
I cannot replace the faulty driver now, so the thing I actually would like ...
6
votes
2
answers
358
views
How to get Newly Expanded RAID to show correct size in Debian
I recently expanded my RAID 5 Storage Virtual Drive from 6TB to 9TB. The Dell OMSA and the bios for the RAID controller both show I'm at 8382GB. Which is fine.
But when get into Debian and poke ...
- 217
1
vote
1
answer
98
views
is it possible to move hard disks in raid 5 to pc without raid controller for accessing the information Temporarily?
I want to rebuild my array (RAID 5) for expansion. In the current configuration, I have 3x320GB hard disks giving me about 600 GB usable. I want to replace these hard disks with 3x1TB hard disks ...
- 15
3
votes
2
answers
4k
views
Is it possible to update stripe-width on an existing, and used, ext4 fs?
I have a RAID 5 with 5 3TB drives (8 in few weeks), on a Debian. There is only one ext4 partition on it, using all the space available.
Actually, due to origins of the RAID (4 drives), the ext4 fs ...
- 33
2
votes
2
answers
3k
views
Missing VirtualDisk on bootup (RAID)
I have a Dell PowerEdge 2950 with DAS storage attached (MD1000)
I rebooted the server to apply window updates (win2008), on restart BIOS detected a VirtualDisk was missing and wanted me to continue or ...
- 455
-2
votes
1
answer
80
views
Raid-5 Linux Software array, 3 drives "removed"
I have a raid array with several drives marked as removed. I want to add them back in, but am not sure how to do so.
[root@tera2 ~]# mdadm --detail /dev/md3
/dev/md3:
Version : 1.2
...
- 67
1
vote
1
answer
2k
views
Recovering a RAID5 with 2 disks out of the array
I don't want to approach this in a trial-and-error manner as I know this is the best thing to do if I want to loose my data.
I have a server with 4*2TB disks in RAID5 (yes I know it's not wise) on a ...
- 825
0
votes
1
answer
96
views
Would this RAID 5 solution work?
I have a question about RAID 5 rebuilding.
Let's assume the following: A RAID 5, 3 disk (5TB each) array (i.e. 10TB useable).
If a disk fails, the data remains accessible (e.g. employees could ...
- 1
1
vote
1
answer
720
views
Raid fault - Dell PowerEdge T11 II
The server is Dell PowerEdge T11 II
PERC S100 Virtual Disk Management (Build: 2.0.0-0162)
Disk 0 is set too Offline and gives message
NOT SELECTABLE: Read error:
There is small sound coming from ...
- 323
-7
votes
2
answers
268
views
replacing 3 drives out of 8 in a server [closed]
We have a Dell R510 server running SQL 2008 R2 with 8 x 300GB drives running Raid 5.
We (just noticed) we had three bad drives with blinking lights so we powered down the server and replaced them ...
- 1
0
votes
1
answer
1k
views
Why is Win Server 2012 slow to read data with RAID 5?
We have new HP 350p server with 4x 900GB 10k SAS disks with RAID 5 (win server 2012). But disks performance to read data is to slow - it's to slow to read big directory structure on disk. Where can be ...
- 111
3
votes
2
answers
1k
views
Software RAID 10 not any faster than s/w RAID 5 on Ubuntu 14.04 box, why?
We are doing some tests on a new database server with 4 x 240 GB SSD disks. From what I have read RAID 10 should be faster than RAID 5 with the same "one-disk loss ok" redundancy.
However when ...
- 609
0
votes
1
answer
3k
views
How to solve performance problems with VMware ESXi 5.5 on old Dell PowerEdge 2900 hardware [closed]
I have a couple of old Dell PowerEdge 2900 servers that have come free and I would like to use them to host a mail server cluster.
They are a bit old, but have been running workhorses for a while, ...
0
votes
0
answers
769
views
Sata RAID5 Orphan Drive
so today, one of our hadware RAID5-controllers (Sil3124 (r5), 4x 2TB) went into degraded / legacy mode without any notifications. Additionally, automatically rebuilding the raid-group failed:
Event ...
0
votes
1
answer
115
views
Analyze SMART self-test for broken disks [closed]
I recently came home from vacation only to wake up the following morgon with two disks in my RAID5 array marked as faulty. I was able to start the RAID by forcing it to use the faulty disks and run, ...
-2
votes
1
answer
135
views
Removing HDD from RAID 5 to pull data from
I have a relatively (I think) simple question...
I have a file server with RAID 5 that is old and pretty much dead and I need to grab the data from it. I was thinking I could pull one of the HDD's ...
- 121
3
votes
2
answers
8k
views
RAID5 array Ready for Rebuild
I've inherited administration of a server with a RAID 5 array. We have a damaged database on the array that is just over half the allocated size, so makes recovery impossible.
I recently changed the ...
- 41
0
votes
1
answer
422
views
Windows 2008 R2 server software RAID-5
After one of the reboots (normal one after windows update) Windows 2008 R2 marks software RAID-5 disks (OS-Based) as "Invalid". RAID structure is intact - I can see it via R-STUDIO. All data are OK ...
- 1
-5
votes
2
answers
124
views
Can a RAID5 be corrupted if Drive 0 has been failed and how could this be fixed? [closed]
I have configured RAID5 on an ASUS server and installed VMware ESXi 4.1 on it.
The attached photo indicates that Drive 0 resides in a Failed state. All Hard Disk Drives (HDDs) are running Normal.
...
- 11