Tagged Questions
-1
votes
3answers
97 views
Raid 0, Raid 1, Raid 5, Raid6, Raid 10 Read/Write performance? [duplicate]
Assume a single disk has a baseline of 1W & 1R performance, how does the different RAID configurations behave?
My initial guess:
Raid 0: 2W 2R
Raid 1: 1W 2R
Raid 5: ? ?
Raid 6: ? ?
Raid 10: ...
0
votes
1answer
66 views
RAID: replacing a disk before it fails
We have a RAID 5 setup (Megaraid SAS ROMB) with 4 930 Gb physical disks running as a 2.7 TB VD. Recently (a few months back) we had a drive fail and had to leave it in degraded mode for ages (various ...
2
votes
1answer
57 views
How to resize Windows partition after conversion from RAID 1 to RAID 5?
I'm using Fujitsu PRIMERGY RX200 S6 with RAID controller RAID Ctrl SAS 6G 5/6 512MB (D2616)
I've migrated RAID 1 (2 discs) to RAID 5 (4 discs) without any problems and on the fly without restarting ...
1
vote
1answer
112 views
Linux mdadm RAID5 data recovery with one drive failed, one drive failing
Improbably I had two drives fail in the same Raid5 array within 2 weeks of one another. Which means the array is dead. Yes yes hot spares not being lazy about replacing the failed drive I know. But ...
2
votes
0answers
115 views
raid 5 mdadm drive dropped whilst growing
I have a 4x 2tb raid 5 mdadm array which I had begun to grow onto a 5th disk.
~# mdadm --add /dev/md1 /dev/sdb
~# mdadm --grow /dev/md1 --raid-devices=5
midway through the grow I recieved this in ...
3
votes
1answer
176 views
RAID-5 or RAID-6 - is RAID-5 really that bad? [duplicate]
Possible Duplicate:
Which is better: RAID5 + 1 Hotspare / RAID6?
I need to decide myself between RAID5 and RAID6.
The servers have a hardware-RAID controller and 6 drives each.
The ...
0
votes
1answer
38 views
Arch Linux on Software RAID, can't find VolGroupArray
I am trying to install Arch Linux on a Software RAID that I am building following their instructions on the Wiki. I built as far as the Logical Volumes and after that switched to the Installation ...
1
vote
1answer
61 views
Migrate Windows Dynamic disk RAID5 to Linux LVM
Is this even possible, do I have the right tool in mind?
I have 3 disks that are running as a software RAID5 using windows. I would like to migrate box to Linux without experiencing data loss.
Am I ...
1
vote
1answer
76 views
Reshape linux md raid5 that is already being reshaped?
I just converted my RAID1 array to a RAID5 array and added a third disk to it. I'd like to add a fourth disk without waiting fourteen hours for the first reshape to complete.
I just did this:
mdadm ...
3
votes
1answer
161 views
Manually recovering a RAID5 array, how to approach?
Basic situation:
I'm looking to manually reconstruct a RAID5 array for which the controller has lost the configuration. To complicate matters, the volume is encrypted with full disk encryption (to ...
0
votes
1answer
124 views
Do I need to rebuild the array after putting in a new hot spare?
So my experience with RAID is minimal. So I figured I'd come and ask here. We have a 16 drive RAID system that have 15 drives in RAID 5 with a hot spare left over. Recently one of the drives in the ...
5
votes
2answers
373 views
Reusing Raid 5 Drive?
We have two servers (ML530 G2 and DL380G2) w/ identical HP 10K RPM SCSI drives w/ a raid 5. One is decommissioned and the other will be decommissioned shortly.
However, one of the drives on the ...
1
vote
1answer
224 views
Risky to have RAID5 with 3x3TB drives? What alternatives should I be considering?
A drive dropped out of my raid 5 array yesterday. It looks like the reason was due to a bad controller so I switched it out and attempted to re-add the drive but mdadm claimed it couldn't do it. So I ...
1
vote
1answer
103 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 ...
0
votes
1answer
109 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 ...
-3
votes
1answer
1k 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
...
1
vote
1answer
313 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
436 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 ...
3
votes
2answers
888 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
1answer
475 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
580 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
666 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 ...
0
votes
4answers
268 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
143 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
194 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
93 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 ...
3
votes
6answers
544 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
116 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
438 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
167 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 ...
-1
votes
1answer
892 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; ...
0
votes
2answers
152 views
Increasing capacity of RAID5 array [closed]
Assume that I built an 2TB RAID5 array and its running and some data is stored on it.
Now I need to increase its size to 5TB.
Can I increase capacity (By adding extra drives)? How?
If Yes is it ...
-4
votes
1answer
474 views
Debian Squeeze with RAID 10
I'm trying to do a fresh install of Debian Squeeze on a server and set it up with RAID 5, or RAID 10 if possible (4 disks). I'm having difficulty finding detailed instructions on how to do this. I'm ...
3
votes
1answer
393 views
Configure Windows RAID-5 “drive failed” timeout?
When a hard-drive controller detects an error, and needs to remap a sector, the drive normally becomes unresponsive for the seconds (or possibly minutes) it takes to try to complete the re-mapping.
...
0
votes
4answers
2k views
How long should a RAID Reconfiguration take? (Adaptec 6805)
I'm experimenting with various RAID configurations of a new Adaptec 6805 (not the 'E' model)
Attached are 8x Hitachi 5400RPM 2TB SATA 6Gb Drives using the miniSAS to SATA cables provided.
I created ...
1
vote
1answer
191 views
Intel RAID Controller Rebuild RAID 5 While Windows Running
We have a RAID 5 array (3 drives) one of which failed this morning. If we take that drive out the system can boot into Windows Server '03 fine. Problem being we don't have anywhere to go if another ...
3
votes
2answers
432 views
Replacing a Hard Disk in RAID 5 Array with Newer Version
Recently, 1 out 4 disks in my RAID 5 array failed. I searched for a replacement part and learned that only a newer version of the hard disk is available. This "newer" version has the exact same specs ...
3
votes
4answers
594 views
Running swap on RAID10 or RAID5?
In follow-up to this previous question (and it's excellent answer), I am curious to know if running swap on a RAID5 might not be better than on a RAID10.
My thinking is that you might lose a bit on ...
2
votes
1answer
1k views
Why does MDADM Raid 5 require a spare
From the mdadm man page:
"When creating a RAID5 array, mdadm will automatically create a degraded array with an extra spare drive. This is because building the spare into a degraded array is in ...
1
vote
2answers
113 views
Raid 5 fail safe
In a 4 300 GB disk raid 5 setup, the usable space is 900GB. So in the event that one of the hard disk fail, is it that the space available for write will drop to 500GB? It is right to said that in ...
4
votes
3answers
2k views
How do I stop and repair a RAID 5 array that has failed and has I/O pending?
The short version: I have a failed RAID 5 array which has a bunch of processes hung waiting on I/O operations on it; how can I recover from this?
The long version: Yesterday I noticed Samba access ...
0
votes
2answers
132 views
Data integrity after RAID5 crash
After a hard drive died on a RAID5 setup on a legacy system, the Vmware Virtual Machine on it kept on running for a period of 6 months. Needless to say, finally it crashed bad. Now, the dead hard ...
2
votes
2answers
400 views
Proliant ML350 G3 System board failure
My ProLiant ML350 G3 Tower server's system board has gone bad after it had an inch of its lower edge in rain water. I have a SCSI controller Smart Array 532 with six (36GBx3 and 146GBx3) under RAID5 ...
5
votes
4answers
419 views
mdadm: Replacing array with entirely new drives
I have a server with three 500GB drives, with most of my data in a RAID5 configuration spanning the three of them.
I just purchased and installed four 1TB drives, and the intention is to move off of ...
0
votes
2answers
366 views
How to identify RAID (5 or 6) controllers that allow dynamic resize of the array
I'm building a server with a RAID5 array, based on a hardware controller. I want to be able to later add additional disks and have the array rebalance across all of the disks, enlarging the usable ...
0
votes
2answers
122 views
/home partition stuck
I have development box with apache and userdir mod enabled.
Sometimes, entire /home partition becomes inaccessible.
Apache can't access scripts stored there, and I cant cd to /home nor ls its ...
4
votes
3answers
701 views
Which RAID level (5 or 0+1) should I use with 3 disks and why?
This is specifically for backup storage but, for informational purposes, I would like to know why would you chose one over the other?
Five minutes ago, I was not even aware that RAID 0+1 was an ...
5
votes
3answers
2k views
RAID 5 with big SATA disks. Do or don't?
Is it sane to build a machine with RAID 5 expecting to hold around 5 Tb (and able to grow) with 1.5 or 2 Tb SATA II disks?
It will be used as audio and documents storage. I already have chosen a ...
0
votes
3answers
6k views
Can I recover a RAID 5 array if two drives have failed?
I have a Dell 2600 with 6 drives configured in a RAID 5 on a PERC 4 controller. 2 drives failed at the same time, and according to what I know a RAID 5 is recoverable if 1 drive fails. I'm not sure if ...
0
votes
2answers
1k views
Intel Rapid Storage Technology - Raid5 is very slow
I build a computer with a raid5, using the motherboards raid controller (ASUS P7H57D-V EVO - intel Rapid Storage Technology). The read and write are however very slow, when using the raid controller ...
