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

-3
votes
1answer
2k views

Extend RAID 5 to use unused space and add additional disks?

I am new to RAID. I want to extend an existing RAID 5. The current setup is as follows: Array A unused space : 349956 MB logical drive :1 total size 273GB raid5 disk : /dev/cciss/c0d0 physical ...
2
votes
4answers
163 views

Data consistency with RAID 5 and BBWC

I have a few questions about RAID 5, BBWC (Battery Backed Write Cache), filesystem (ext3) and optionally mysql. I have a hypothesis and I ask Server Fault community to validate or not this one: -The ...
1
vote
1answer
356 views

RAID 5 has no READ speed advantage over single drive?

I have recently acquired an Intel SASMF8I raid card for my office. I have 5 x 1TB disks and have created two arrays, 3 x 1TB RAID-5 and 2 x 1TB RAID-1. The second drive is for sensitive/vital data and ...
2
votes
1answer
274 views

Partitioning and configuring a RAID array for a dedicated MySQL server

I'll be running ubuntu server on a 3 disks server (450 GB each) and 16 GBs of RAM. My target at the moment isn't configuting MySQL itself, but what could be the best RAID configuration for my case ...
1
vote
1answer
920 views

Ubuntu RAID5 Software Raid inactive - unable to boot into Ubuntu from non-raid drive

I have a server with 6 disks in it, 5 of which are in a RAID5 array. I came home from work today to find that the landlord had been through the house with a sparky, and the power had been reset. Now, ...
2
votes
3answers
247 views

/boot on separate disk or on the raid array

I have 3 ssd disks (59 GB) each. I want to use them as sofware raid5 with fedora 15. I read that it is recommended to have /boot on a separate disk. 2 questions: 1) is it possible and advisable to ...
2
votes
3answers
3k views

“Parity Initialization Status: In Progress” for long time

Two weeks ago I installed 6 new hard disks (HP 500GB 6G 7.2K SFF 2.5-inch 2-ports SAS DualPort Midline, 507610-B21) in a "HP DL 380 G5" with a "Smart Array P400" (RAM Firmware Revision 2.08, ROM ...
2
votes
1answer
561 views

What was the default chunk size in previous versions of mdadm? Is there a way to set data/super offset? Trying to recreate a raid 5 md with all spares

I have a 6 device raid 5 array which had 1 disk go bad and then due to a power outage, the machine shutdown and when it started all the disks were showing up as spares with the following mdadm -E ...
-1
votes
2answers
329 views

Restoring raid 5 array after bios flash

I have just flashed my BIOS and now my machine does not detect my raid5 array! It has three 2TB drives in it so that is a LOT of data that will be lost! I have NOT deleted the array and it does not ...
1
vote
2answers
147 views

Adaptec 2020SA RAID controller Set up in RAID5, one drive went down, can I still get data?

I have 6 1tb drives in a RAID5. 1 drive went down. On the RAID was 2 virtual machines that I really need back up and running. The spare drive I have to put in the server is a 1.5tb drive, which ...
0
votes
1answer
324 views

How does RHEL alert a user about the failure of a hard drive in a RAID configuration?

I have, for better or worse, been put in charge of a big-ass server running RHEL6. It has six 1.5 TB drives in a RAID5 configuration. I understand the theoretical concepts behind RAID, and I access ...
0
votes
1answer
585 views

Removing or Adding a disk to a HP MSA60 array crashes everything

I am really new to RAIDs and all that goes along with them. I simply added a disk (same 500mb size and part number) into the MSA60 raid enclosure and basically everything started going wrong. The ...
3
votes
2answers
1k views

Raid 5 with 4 disks on Debian automatically creates a spare drive

I'm trying to to create a RAID 5 with 4x 2TB disks on Debian 6. I followed the instructions from: http://zackreed.me/articles/38-software-raid-5-in-debian-with-mdadm I created the raid with following ...
1
vote
2answers
836 views

MSA20 RAID5 recovery failure due to URE on another disk

I have MSA20 with one disk array on 12 disks and 3 LUNs on it (each raid 5). A few days ago one disk in one of the LUNs was failed and I replaced it. But raid5 recovering failed at 13% and I see in ...
0
votes
2answers
623 views

Merging unallocated space to existing partition in Raid5

I have Dell PowerEdge Server T310 built with a Raid5 (3 x 300gb) Windows Server 2008 R2 SAS controller PERC H700. I have recently added a 4th drive 300gb thru Dell’s application “Openmanage”. The ...
6
votes
2answers
3k views

Convert a Smart Array RAID5 array to a RAID6 (ADG) variant

I have an HP MicroServer (N36L) with a SmartArray P410 controller, a 512MB BBWC unit and four (4) 2TB disks connected. Three of those disks are configured as a single RAID5 array and one is left ...
1
vote
4answers
256 views

Ubuntu Server: Partitioning large hardware raids

I am trying to set up a storage server which has a hardware raid controller and 15x3 TB harddrives. This server is a dedicated server from hetzner.de and I am using the default setup routine ...
0
votes
2answers
986 views

mdadm raid5 too slow when writing

I have set up a RAID5 array using 4 disk partition. All disks are 2TB. When the RAID5 array was initially syncing it was too slow. So I did a echo 32768 > /sys/block/md2/md/stripe_cache_size and ...
-3
votes
1answer
60 views

Not seeing the expected volume in a RAID 5

I have expanded a RAID 5 to include 12 - 3 TB drives. I was expecting seeing a total of 33 TB in the RAID but only see 30 TB. I do not have a hot spare. Could 2 drives be reserved for parity? This ...
1
vote
1answer
760 views

why does windows 2008 resync software RAID after a power outage?

i had a power outage. before the outage my RAID 5 (4 SATA drives) was fully synced. perhaps I was doing some trivial writes during the poweroutage, but afterwards windows decided it has to do a ...
2
votes
4answers
991 views

Optimizing RAID 5 for BackupPC use (small random reads)

I am running a BackupPC server with a hardware RAID 5 for the main storage of the backups. Since the machine was created on a tiny budget, the controller is a 3Ware 9500S-4LP for the PCI port and the ...
2
votes
3answers
1k views

Raid-5 Performance per spindle scaling

So I am stuck in a corner, I have a storage project that is limited to 24 spindles, and requires heavy random Write (the corresponding read side is purely sequential). Needs every bit of space on my ...
-1
votes
1answer
136 views

proliant 380gl g5 raid drive rebuilt but leds are both lit bright green

After replacing a failed Raid 5 146gig SAS drive in logical drive 2 yesterday the system reports all is good but the LEDs on the front of the drive are both on and the one on the left is bright green. ...
3
votes
1answer
3k views

RAID5 on SmartArray P410i online resize

I have P410i+256M Cache without battery backup. My RAID5 was build over 3*136GB disks, now all disks were replaced to a 3*300GB array. How can I extend it to use the whole space? HPacucli doesn't ...
3
votes
2answers
3k views

Proliant DL360 Raid5 Hot Swap Drive

I have a DL360 G5 running WinSrvr2003 with a 3 drive (72GB) SAS Raid 5 array on P400i controller. The single array has two partitions. (OS and a data store) Drive 2 has failed and is off line (Amber ...
1
vote
1answer
197 views

Raid 5 recovery

Attempting to recover a 5 Disk Raid wherein 2 of the 5 disks are out of sync. Is it safe to create the raid from 4 of the disks? mdadm --examine /dev/sd*1 > /raid.status grep Role raid.status ...
0
votes
4answers
312 views

Software RAID setup questions [closed]

I would like to set up a server at home that will have several roles, but the primary and most critical role would be a file server. It will host family photos and videos among other things that I do ...
2
votes
1answer
1k views

dirty degraded array, unable superblock, kernel panic

Machine: linux centos 5.4 with 2 hdds and raid 5 (yes, 3rd disk missing). Situation: all running fine (3rd disk missing) then a power off (system shut down itself when battery power ended). ...
2
votes
1answer
173 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?
0
votes
1answer
312 views

Ubuntu 10.04 RAID 10 rebuild status

I got an IBM x3550 M3 server, with 6x 300GB SAS HDD installed, running in RAID10. Ubuntu 10.04.3 LTS is installed. For RAID card, I'm using ServeRAID M5014. If a HDD is replaced, how can I know the ...
-3
votes
1answer
201 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
2answers
291 views

EDB repair in SBS exchange 2003

One week before in our HP PROLIANT ML370 G5 server with RAID5 one hard disk turned amber and we removed and it is working under degraded state until now. Yesterday morning our users in the domain ...
1
vote
3answers
4k views

HP DL370 G5 hpacucli shows 2 drives as Predictive Failure - safe to try a rebuild 1 by 1?

I have: Openfiler SAN ML370 G5 Smart Array 6400 slot 1 Array B Logical Drive 2 is a RAID5 array of 6 x 148GB 10k hot plug drives making 680GB no spare Last Friday, the power went out, this machine ...
0
votes
1answer
211 views

Setting up separate raid5 on Debian

I want to set up a NAS/share with SAMBA on Debian(squeeze) with Webmin, and i want a setup like this: 2x40GB(IDE), in RAID1 for distro/debian. 4x40gb(SATA), in RAID5 for storage/NAS This is just ...
-3
votes
1answer
99 views

how to know raid 5 disk failed, server is in remote [closed]

the server is remote, cannot see the disk's LED light. The Raid Controller is motherboard integrated. 6 disks build a Raid 5. Windows 2003 Server system. so if one disk failed, how the admin get ...
2
votes
3answers
436 views

ZFS, raidz1: Why is the volume size (42T) so much smaller than the pool size (50T)?

I have a pool of 28 2TB-disks (56T) in 4 arrays of 7 disks. Since it's raidz1 (~RAID5), I'd expect 1 disk to be used for parity in each array, so the resulting volume should be 2TB*4*(7-1)=48TB, ...
6
votes
2answers
2k views

Convert linux software raid from raid5 to raid6

I currently have a file server with 3 1.5TB disks in a RAID5 array. Since it's pretty much full, I got three additional disks (also 1.5TB each). Now I'd like to switch to RAID6 since 6TB space is ...
0
votes
2answers
144 views

Shrink windows server 2008 software raid

I have a windows server 2008 with 5*2TB disks in a windows server software raid 5. I want to shrink the volume down to 3 disks and use the other two disks elsewhere but can't find a guide on how to ...
31
votes
4answers
11k views

Recover RAID 5 data after created new array instead of re-using

Folks please help - I am a newb with a major headache at hand (perfect storm situation). I have a 3 1tb hdd on my ubuntu 11.04 configured as software raid 5. The data had been copied weekly onto ...
0
votes
2answers
213 views

Failed Redundancy for RAID 5 Disks

I'm facing difficulties in regards to some disk issues if you guys can help me. I am using Windows Server 2003 for my File Server. For the past few days in Disk Management the status of two of my ...
0
votes
2answers
382 views

Installing VMware vsphere 5 on multi raid array server

We recently bought a new server that came with 2 600GB disks in a Raid 1 and 5 2TB disks in a raid 5. Initially this was going run Windows Server 2008 R2, however, it was decided to now run VMware ...
0
votes
2answers
376 views

raid5 samba upload write slows down

I have Samba installed on a server, that has 8 2TB HDDs in raid5, os is debian 2.6.32, 64bit. When I copy a 3.5GB file to the server, the first GB is transferred with about 100MB/s, but afterwards the ...
0
votes
1answer
149 views

Software Raid 5 in Enclosure - Server Crash - Hope?

I'm a software guy. I have inherited a Windows 2008 server that had a 4 disk raid enclosure (one of those Rosewill ones from NewEgg I think) connected to it via eSata. The Windows server was ...
3
votes
6answers
661 views

Server RAID died. How would you recover data from its drives?

We have 9 machines at the moment. One of them had an electrical fault which fried the board but the drives seem ok. I'm not entirely sure how I would even attempt to recover data from it. The drives ...
1
vote
2answers
128 views

NAS Hard drive configuration advice?

Just got a 4 bay NAS. I want to set it up as optimal as possible. I was thinking of getting 3 x 1TB hard drives and setting up as RAID 5. The disk usage will probably be around 1TB max but there is ...
-2
votes
2answers
497 views

Ideal RAID1+RAID5 configuration?

What is the optimal RAID1+RAID5 configuration and why? My thinking is: RAID 1 SAS 15k 146GB drives for the OS. RAID 5 SATA 7.2k 300GB drives for the data. My opinion is that the OS partition should ...
1
vote
1answer
187 views

Linux software RAID-5: failed drive doesn't degrade the array

I have a CentOS 6.0 install sitting in a Hyper-V VM. I'm trying out some of the software RAID features of Linux and I've got a RAID-5 array made up of virtual SCSI disks. Most of it works fine: if I ...
5
votes
3answers
2k views

Is it safe to transfer RAID 5 disks from one server to another?

I have (what I assume) will be a relatively simple question. I have an old file server that I've decommissioned and replaced. I would like to re-use the hardware from the old file server at our ...
-1
votes
1answer
1k views

mdadm and RAID-5 recovery

I am encountering some problems with my RAID-5 array, using mdadm and Debian. First of all, I lost a drive (completely, it is not even recognized by the BIOS), then I replaced it with a new one; ...
4
votes
4answers
226 views

Is it safe to mark a disk ok, in a degraded raid 5 array?

Intel Matrix Storage Console 8.9 showed a degraded array with one disk failure. Yet it offers the option to mark the disk as ok and rebuild the array? When would it be appropriate to do this? Does it ...