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 ...

learn more… | top users | synonyms

0
votes
0answers
48 views

LVM fault tolerance and recovery over 2 mdraid RAID5 arrays PVs

I have an Ubuntu 14.04 LTS server with an mdraid RAID5 array and LVM on top, meaning one PV and one VG using it. The LVM is configured to allocate all the space to one LV. The LV is formatted with an ...
2
votes
7answers
23k views

RAID5 2-disk failure - what steps to take?

I've got a 6-disk RAID5 array on a gentoo server. mdadm is reporting that two of the disks have failed. In the event that the disks are actually gone, I'm prepared to send the drives to professionals ...
0
votes
2answers
45 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 ...
7
votes
1answer
181 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 ...
1
vote
1answer
65 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 ...
5
votes
2answers
147 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 ...
18
votes
8answers
11k views

RAID-5: Two disks failed simultaneously?

We have a Dell PowerEdge T410 server running CentOS, with a RAID-5 array containing 5 Seagate Barracuda 3 TB SATA disks. Yesterday the system crashed (I don't know how exactly and I don't have any ...
1
vote
1answer
35 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 ...
1
vote
1answer
18 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 ...
1
vote
1answer
63 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 ...
2
votes
2answers
62 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 ...
-2
votes
1answer
22 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 ...
1
vote
1answer
167 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 ...
-3
votes
1answer
222 views

RAID 5 Data Loss?

Here is what happend. on a ML 350 with a perc 200i controller, raid 5 with 5 disks. 1 Disk got corrupted , and was was on predictive failure flag. On the replacement of the corrupted disk and after ...
0
votes
1answer
52 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
vote
1answer
125 views

Recovering Linux soft raid 5, disk stays as spare

I got disk failure on my Centos Linux soft raid 5 array (mdadm). I replaced one of the disk and started to rebuild the array. Next time I checked the status, the rebuild was failed. This is the ...
-6
votes
2answers
183 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 ...
3
votes
2answers
176 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 ...
0
votes
1answer
74 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 ...
12
votes
3answers
3k views

mdadm raid5 recover double disk failure - with a twist (drive order)

Let me acknowledge first off that I have made mistakes, and that I have a backup for most but not all of the data on this RAID. I still have hope of recovering the rest of the data. I don't have the ...
0
votes
1answer
358 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
0answers
102 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
1answer
49 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
5answers
11k views

Replacing a dead hard drive in RAID 5 with a different type

One of the drives failed in my server configured with RAID 5, and I can't find a exact replacement. From my understanding, RAID 5 supports drives with different sizes. Is this safe? Any ...
2
votes
1answer
343 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 ...
-2
votes
1answer
46 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 ...
0
votes
0answers
120 views

Low disk I/O causing high disk busy and CPU wait

I have an Ubuntu 10.04 server on VMware that is experiencing 99% disk busy with only 1 MB of disk I/O according to nmon. 300 KB of disk I/O causes 25% to 30% disk busy. iostat reports the same: ...
0
votes
3answers
1k views

RAID 5 Recovery software help - Test Disk

on the test disk website: http://www.cgsecurity.org/wiki/TestDisk it states that it can be used to recover data off raid 5 has anyone found any guides on how to do this? or if someone knows how ...
1
vote
3answers
1k views

Server 2008 RAID 5 Write Speeds

I recently configured a RAID 5 partition in Server 2008 with 4 RAID 5 disks. These disks are connected through a SATA expansion card that uses PCIe. This morning, I checked and they had finally ...
0
votes
1answer
153 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 ...
10
votes
2answers
1k views

What counts as a 'large' raid 5 array?

A recent issue with a Buffalo TeraStation NAS here in my office has got me investigating Raid 5. I've found a few different articles talking about the unsuitability of using raid 5 in large arrays, ...
1
vote
2answers
240 views

How can you force linux software raid not to disable a disk for recovery?

I'm trying to recover data from a RAID5 array. 2 of my 4 disks unexpectedly failed at the same time. I am able to start the array by forcing it. mdadm --assemble --scan --force The array starts up ...
-6
votes
2answers
76 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. ...
-1
votes
1answer
55 views

Can I pull raid 5 disk from IBM X365 to put into another X365

I have an IBM X365 that is sitting in a corner. It has the same size drives as the IBM X365 that has a failed drive. Both have Raid 5. Can I pull drive from the one sitting in the corner and ...
2
votes
1answer
57 views

Raid 5 URE rate [duplicate]

I've recently read this post: http://www.standalone-sysadmin.com/blog/2012/08/i-come-not-to-praise-raid-5/ tldr; It basically says that the error rate of a RAID system is tied to the hardware, and ...
1
vote
1answer
46 views

Optimize unused space in RAID5 due to bigger HDD in spare parts change

I have started with 3x250 GB SATA array, but the old HDDs failed one by one and when the spare parts came they where bigger disk inside and I recently ended up with 3 HDDs of 500 GB. I see ...
2
votes
2answers
217 views

How to identify which hdd to be replaced in RAID

Our RAID5 (using Adaptec 3085) stopped working because one of the hdd is broken. How can I identify which one it is?
-1
votes
1answer
1k views

Repair HP SmartArray p410i

i have an HP proliant server and in the last 4 years i never had a single problem with it. but yesterday i found out that i cant remotely login to my server so i went over and found that one of three ...
0
votes
1answer
84 views

When exactly does a RAID5 reconstruction happen?

Let's assume the following scenario: A RAID5 array consisting of 3 disks is happy and running One of the disks crashes We replace the broken disk with a spare one The system is up and running again ...
1
vote
1answer
2k views

Cannot reactivate RAID-5 volume: The size of the plex member is invalid

We had a 3-drive Windows Server 2008 R2 RAID-5 fail (operating in redundancy mode): WDC 1 TB WDC 1 TB WDC 1 TB We removed the failed hard drive, and put a WDC 1 TB drive (that we had standing by) ...
3
votes
1answer
66 views

Reading /proc/mdstat

I just built my first raid5 yesterday (with 4 hds) and was reading about monitoring with /proc/mdstat. My understanding is an ideal dispaly with 4 drives should be [UUUU] however mine reads [UUU_]. ...
5
votes
4answers
5k views

How do I configure RAID 5, especially stripe size, with 24 x 1.2 TB drives for CentOS 6?

For a Dell R920 with 24 x 1.2TB disks (and 1TB RAM), I'm looking to set up a RAID 5 configuration for fast IO. The server will be used to host KVM VMs that will be reading/writing files of all sizes, ...
0
votes
2answers
951 views

3Ware 9500s Raid array not visible in Windows 7 x64 disk management - latest firmware and drivers

I bought a used 3Ware 9500s-4LP raid controller from Ebay (the old 3ware 8506-4lp didn't support RAID arrays over 2TB, but it was working), installed it in my server and attached it to the SATA ...
4
votes
2answers
423 views

What steps should I take to best attempt to recover a failed software raid5 setup?

My raid has failed, and I'm not sure what the best steps to take are in order to best attempt to recover it. I've got 4 drives in a raid5 configuration. It seems as if one has failed (sde1), but md ...
0
votes
0answers
97 views

Server 2012: Should I use Cached Exchange Mode with Terminal Server?

The setup is a (all brand new) single physical Dell server, with 32GB RAM, running Server 2012. This has a single 3-disk RAID 5 array (DELL PERC) mapped to 3 volumes in Windows. They are SAS disks. ...
1
vote
1answer
413 views

DELL PowerEdge 2950 stuck on BIOS

My DELL PowerEdge 2950 is Stuck on BIOS 2.7 screen and does not advance at all, keyboard is not responding either. How should I troubleshoot this issue? Here is the screen
0
votes
1answer
43 views

Is it possible to install OS during RAID scrubbing?

One of our servers crashed a few days ago. I had to recreate the RAID container with the remaining disks. Currently the system is running the scrubbing process (screenshot below). I would like to know ...
0
votes
1answer
947 views

Dell PowerEdge R720 - Corrupted RAID

Apologies in advance for the lengthy question. We have a Dell PowerEdge R720 server with: 2 x 136GB SAS drives in RAID 1 for the OS (Ubuntu Server 12.04) 6 x 3TB SATA drives in RAID 5 for data A ...
2
votes
1answer
315 views

Large write with dd fail on RAID-5

I have a server with a RAID controller which connects to a JBOD over SAS. JBOD is populated with 16 SAS-HDDs of 3TB (8 of one make and 8 of other, same rpm). I have configured 3 logical drives with ...
10
votes
3answers
2k views

Recover from a Punctured RAID array

here is my situation. I have a Dell Server with a Dell Perc 7i controller, (LSI Controller). I had a drive give me an Failure Predicted warning so I called their support and they came out and ...