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
2answers
881 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 ...
1
vote
1answer
119 views

Building hybrid RAID10 + RAID5 environment

I have the following configuration: simple video surveillance system (server 1: recording past 24h; server 2: recording past 30 days). I am primarily using the content on the 24h storage, while I ...
2
votes
1answer
2k views

Repurpose spare drive in HP ProLiant RAID 5 array

We have 8 300GB SAS drives in a RAID5 + Spare configuration. It seems data capacity planning came up a bit short and I need more disk space. Instead of replacing drives with 600 GB models, I would ...
2
votes
2answers
704 views

Growing a Linux software RAID5 array

On my home file server, I've got a 1.5TB software RAID5 array, built from four 500gb Western Digital drives. I've got a fifth drive that I usually run as a hot spare (but have out of the array at the ...
1
vote
1answer
682 views

What parameters to mdadm, to re-create md device with payload starting at 0x22000 position on backing storage?

I try to recover from mdadm raid disaster, which happened when moving from ubuntu server 10.04 to 12.04. I know the correct order of devices from dmesg log, but given this information, I still cannot ...
3
votes
1answer
396 views

mdadm kernel log messages explained

Welcome. I try to recover from linux software raid failure. I am in a process of recreating the superblocks based on a syslog from the system when it was healthy. The log speaks about 2 md devices, ...
0
votes
1answer
132 views

RAID5 and different sizes of HDDs

Today I set up my first RAID ever. I decided to use RAID5, because I want as much space as possible, but I'm to afraid to use RAID0 because of possible data loss. I have 4 0,5TB drives and in RAID5 I ...
1
vote
4answers
622 views

replacing drive in raid 5 array with non-standard disk

I have a Raid 5 array made up of three HP brand 10k rpm SAS-6G drives with 146 gb size. One of the drives is telling me from its LED that it needs replacement. When I ordered a replacement I found ...
12
votes
11answers
2k views

Is RAID5 more robust than RAID1

I am about to replace an old hardware RAID5 array with a Linux software RAID1 array. I was talking to a friend and he claimed that RAID5 was more robust than RAID1. His claim was that with RAID5, on ...
1
vote
3answers
168 views

Is this a possible/good RAID setup?

Earlier this week, one drive in our office's 2-year-old RAID5 array (4x 750GB Seagate drives, HP ProLiant 110 with Smart Array controller, running Windows Server 2003) failed. From what I know, RAID5 ...
0
votes
1answer
513 views

ServeRAID M5015 Controller upgrading hard disks without downtime or data loss?

The configuration is as follows: 13 x 450G disks on RAID5 with 1 hot spare. There 2 more disks but configured as RAID1. Is it possible to upgrade the hard disks without downtime or data loss?
5
votes
7answers
9k views

Raid 5 with hot spare or RAID 10 with no hot spare?

Yes, this is on of those "do my job for me" questions, have some pity:) I'm at the limit for what I can do with the number of hard drives in a server without spending a substantial amount of money. ...
0
votes
1answer
138 views

How to rebuild my NAS

Today I have a QNAP TS-859U+ with 8 X 2TB disks in it. As it's was setup on day-1 it uses a single volume on a raid 5. The volume has currently a mixture of: 2 shared folders 5 iScsi Targets - ...
3
votes
2answers
4k views

How can I view Server 2008 Software RAID 5 Resync Progress?

Skipping over the pros/cons of RAID 5, I have a software RAID-5 array made from 3x 2TB disks. I started the sync and nearly 12 hours later the sync is still going. Is there any way that I can view the ...
-3
votes
1answer
3k 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
177 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
384 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
349 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
1k 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
349 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
5k 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 ...
1
vote
3answers
861 views

Problem with RAID5 (mdadm) - disk detached

Having these lines in /var/log/syslog Apr 18 16:53:05 Server kernel: [4487878.816036] ata4: EH in SWNCQ mode,QC:qc_active 0x1 sactive 0x1 Apr 18 16:53:05 Server kernel: [4487878.816058] ata4: ...
0
votes
1answer
251 views

Older raid controllers in raid 5 vs. Jbod and SW raid

I'm in the fortunate position to have 6 Supermicro older VOD servers with the following config: Supermicro 3U case, 3xPSU Dual Xeon 3ghz P4 class cpu (5 years old.. havnt checked the exact type) 4GB ...
2
votes
1answer
617 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
424 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
162 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
774 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 ...
0
votes
1answer
432 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 ...
1
vote
2answers
1k 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
723 views

Rosewill RSV-S5 and it's transferespeeds

I have just bought a Rosewill RSV-S5, I have installed 5x1,5Tb Western Digital Green disks in it. After that have I created a Raid5 on them all with the software that followed with the hardware. Not ...
2
votes
2answers
6k views

Windows Server 2008 R2 Software Raid 5, Resynching (4 days so far)

I have a software raid 5 of 5x1,5Tb harddrives, this raid has been made in Windows Server 2008 R2. Now I know that Resynching can take a lot of time to be preformed, but so far have it been running ...
1
vote
4answers
305 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
1k 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
62 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 ...
3
votes
4answers
1k 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
1answer
896 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 ...
11
votes
9answers
17k views

How many disks is too many in this RAID 5 configuration?

HP 2012i SAN, 7 disks in RAID 5 with 1 hot spare, took several days to expand the volume from 5 to 7 300GB SAS drives. Looking for suggestions about when and how I would determine that having 2 ...
3
votes
2answers
4k 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 ...
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 ...
3
votes
1answer
4k 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
1answer
2k 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). ...
1
vote
1answer
224 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
344 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 ...
1
vote
5answers
5k views

Disk failed part way through 3ware RAID 5 rebuild

I have a 3ware 9650SE RAID controller with a RAID 5 array containing 15 Seagate ST31000340NS disks. After noticing ECC errors in the Port 10 drive I replaced it with a spare and began a RAID rebuild. ...
1
vote
2answers
139 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 ...
0
votes
1answer
358 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
212 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
360 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 ...
0
votes
1answer
214 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
102 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 ...