Issue Mounting RAID Perc Partition
May 19, 2007
We had a problem on one of our servers and it was running RAID 1 with two 300GB SAS.
When I boot the server I have the following issue,
PXE:E61: Media test failure, check cable
I searched through all the net but couldnt find a solution that helped me.
Now I took one of the HDDs out and installed as slave on another Linux server. One of the HDDs says when I do /sbin/fdisk -l,
no partition table for /dev/sdb (something like that)
The other HDD have all the partition table,
/dev/sdb1
/dev/sdb2
/dev/sdb3
/dev/sdb4
/dev/sdb5
The big partition (probably when I have my data) is under /dev/sdb2, although when I try to mount that partition I get the following error,
mount: wrong fs type, bad option, bad superblock on /dev/sdb2
missing codepage or other error
In some cases useful is found in syslog - try
dmesg | tail or so
Is any command specific for mounting RAID partitions or the HD is gone ?
I really need the data that are inside it.
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Mar 16, 2008
I have a disk in raid, but it seems raid is not working correctly. I took it out, and plug into another server without raid. However, fdisk shows error
Quote:
#fdisk /dev/sdb
device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel. Changes will remain in memory only,
until you decide to write them. After that, of course, the previous
content won't be recoverable.
The number of cylinders for this disk is set to 20023.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
(e.g., DOS FDISK, OS/2 FDISK)
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)
Command (m for help):
Should I correct the partition table now, or should I put it in another raid for checking?
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Oct 17, 2007
Will a Perc 5 raid card work in a non-dell Linux server? These cards can be found for about $100 on eBay, and are much cheaper than the Adaptec cards with similar features and ports.
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Oct 22, 2007
The server is currently live on /dev/sda and it was installed w/o raid. Now i have added a second HDD in, how do i RAID it?
It's Ubuntu 6.06
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Mar 7, 2007
Quote:
Today we are going to conduct a detailed study of RAIDability of contemporary 400GB hard drives on a new level. We will take two "professional" drives from Seagate and Western Digital and four ordinary "desktop" drives for our investigation. The detailed performance analysis and some useful hints on building RAID arrays are in our new detailed article.
[url]
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Jul 4, 2008
i have centos 5 server i want install xen on it on my server is just one partion how may i resize this partion( without format partion/with put delete data) and then create lvm partion?
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Jun 17, 2008
Will the Dell-made PERC 4 DC (or SC) RAID cards work in Sub v20z servers?
The Sun v20z specs :
[url]
From what I gather, it should in theory work, as they are both PCI-X and Ultra320 SCSI ... right?
If they won't work, can anyone recommend any raid cards that will?
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Jul 17, 2008
i had a big problem with my OS and server so i added a new HDD to my server with new os, but how can mount my old hdd without getting data deleted?
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Jul 14, 2007
I read a few threads and it seems as simple as fdisking the drive and then mounting it, but im a little scared..
so if someone has a proper step by step guide to do this can they please help me..
at the moment i have a 40GB ( ide, i think ) hdd and a secondary 250GB IDE hdd, i also have servercp installed and i think im on fedora 6..
Now i dont want to just type fdisk dev/hdb incase that is my first 40gb hdd, i dont mind losing the extra data on it i just dont want to format the OS and stuff was im on an un-managed server and will cost me time / money for them to re-install it all..
is there a ssh command to list all the hdd's connected to the server and to tell me what size they are, and where they are on the server before i start formatting, fdisking and mounting them?
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Nov 8, 2009
My server has been formated it has two drives. I have my back up on the second drives.
What is the command I use to list the drives and how to mount the second drive.
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Dec 3, 2007
I am going to mount my new hard drive to /home/user/public_html but I have a question before I do so. If I upload stuff to /home/user/public_html will it go to my new hard drive that I just mounted there or will it still go in the old hard drive?
The reason why I want to mount it there is because my other hard drive ran out of space, and I would like to continue this user account's space without having to move this user.
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Feb 6, 2008
Problem with VRTservers.net . they turned off my server and tell me :
To turn on the server, we require:
1. the payment of reconnection fee $ 30
2. the server need to be reformatted.
If you do not want to lose your data, you may purchase secondary HDD so you can
transfer your data to the secondary hard drive.
FYI : mounting the old hdd is not our responsibility
If I do step 2 .Is it Possible ? (I need All data)
I think if I mounting a new Hdd , I lose All data -
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Feb 15, 2008
so my provider setup my HDD's wrong (i believe).
Filesystem Size Used Avail Use% Mounted on
/dev/sda2 9.7G 5.7G 3.6G 62% /
/dev/sda5 215G 608M 204G 1% /var
/dev/sda1 99M 16M 78M 17% /boot
tmpfs 1013M 0 1013M 0% /dev/shm
/usr/tmpDSK 485M 14M 447M 3% /tmp
the problem is that I have /dev/sda5 mounted to var. I want cPanel to use this HDD as the main storage for the /home directory. How do I make cPanel use this hdd for storage?
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Jun 16, 2009
My second hard drive is mounted as /backup. I have a remote rsync backup. i want to remount thsi second hard drive to /home2 instead
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Jul 25, 2007
I wanted to mount a Usb portable drive of some data I have inside my Linux server and make them read on my Windows xp.
The drive has been formatted as ext3 and it just won't show in "my computer" inside Windows unless I reformat it again as ntfs.
The same turns around if if I format as ntfs, and i can't mount it under linux with the message "mount: unknown file system type 'ntfs'"
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Jul 12, 2008
Purchased a dell PE2650 which has a perc 3/di controller for raid, server 2003 installs fine (downloaded a 60 day trial of standard/enterprise)
The problem is server 2008, when I insert the cd it just hangs (via boot) it loads within server 2003 (but due to the demo being enterprise/standard edition and 08 being web edition I cannot "upgrade" 03-->08)
I have upgraded the bios and all the controllers and it is still the same, I have even used the dell pre-OS installtion disk for the PE2650 and 08 but the screen remains the same, just the background image (grey) with no text and no movement.
Since 03 loads fine I assume it is due to a lak of driver support, (and within windows it mentions perc problems to load suitible drivers)
At the moment, I have switched to scsi drives, loading 03 on one disk and will try to load 08 (within windows) onto the second hdd and try to use drivers located on the disk.
Has anyone managed to load 08 web edition on a PE2650/other perc 3 device?
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May 30, 2008
Basically, I bought this case:
[url]
and didn't forsee any problems as we have lots of servers with this case at work (which is where I am co-locating the server) but I didn't realize that the racks we have those servers in are setup for a longer depth (like 26-30 inches) instead of 24 inches like the rest of the racks. Well the problem is that all employee stuff is limited to two different racks and both are 24" depth racks so the rails which came with the chassis (26 inch) will not work. Does anyone know of anywhere I could get a 24" rack mount kit which will work with the supermicro SC-825 2U case?
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Sep 13, 2007
I look after a Dell PE2800 server, it has a pair of 5.25 bays on the front, the top most of the two contains a Dell PowerVault 100T DAT72 tape backup drive. I have a second identical drive that i now wish to install into the bay beneath in a similar manner.
Problem is this - my colleague tell me that Dell are no longer selling the mounting brackets / rails needed to install the drive. I have had a fruitless look through the internet for a number of weeks now and hope that someone in the forum may be able to suggest a solution to the problem... anybody know a source for the brackets? Is there a parts site somewhere ive missed? Anyone happen to have what im after? Or any alternative suggestions?
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Mar 24, 2008
Is Motherboard RAID as good as a dedicated PCI-E card? I am guessing a dedicated card is the best option, though costs more.
We are looking at buying a barebones server from Supermicro. It features an onboard RAID controller which supports RAID 0, 1, 5 & 10 - but for some strange reason it will only support RAID 5 if you use Windows. Here is a link to the page detailing the RAID features.
[url]
We are going to be running Linux, CentOS 5.1, so we will only have the choice of RAID 0, 1 or 10. This isn't an issue, as having RAID 10 on 4x SAS (15k) drives will be fine for speed and stability. What is an issue is would this RAID controller be as fast or reliable compared to a dedicated PCI-E card? If it can only use RAID 5 in windows, does that suggest this controller is too reliant on software? It would be a nightmare to suffer downtime and data loss because the controller couldn't hack it during a drive failure, or one day it decided to bugger up the array when rebooting.
So that leads me to looking at this card, this looks very good for what we need. Are adaptec a reliable brand? I've seen it advertised for £200, which is a good price.
[url]
This card features RAID 5 and 6, would RAID 6 be better than RAID 10 for redundancy, or is it too slow to bother with? Also it seems to have a battery module available for it, what does this achieve? Cos surely if the power dies the hard drives and motherboard can't run off this little battery, or does it just help the controller stay alive long enough with some hard drive information in its memory if the power goes out during a rebuild?
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Sep 17, 2009
I could try the Software-RAID 5 of the EQ9 Server of Hetzner.
Does anyone here has experiences, how fast a hardware raid 5 compared against the software-Raid 5 is?
The i7-975 should have enough power to compute the redundnacy on the fly, so there would be a minimal impact on performance. But I have no idea.
I want to run the server under ubuntu 8.04 LTS x64.
On it a vitualisation like VMware the IO-Load could get really high.
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Jan 14, 2008
So I've just got a server with 2xSATA raid 1 (OS, cpanel and everything in here) and 4xSCSI raid 10 (clean).
Which one do you guys think will give the best performance:
1. Move mysql only to 4xSCSI raid 10
2. Move mysql and home folder to 4xSCSI raid 10
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Jul 8, 2007
I am in a somewhat complicated situation... I wanted to order a custom server with hardware 3Ware RAID controller but after over a month of waiting I was told the HW RAID controller, as well as any other 3Ware controller they tried, does not work with the motherboard used in the server from Fujitsu-Siemens and that they simply got a reply from FS that the controller is not certified to work with their motherboard.
So although I'd prefer a HW raid, I am forced to either choose a different webhost or setup a software RAID. The problem is, I haven't done that before and am somewhat moderately...scared
I have read a lot of the info about SW RAID on Linux that I could find through Google but there are some questions unanswered still. So I thought that perhaps some of the more knowledgeable WHT members could help me with this problem...
The server specs will be:
Core2Duo E6600 (2.4Ghz), 2GB RAM, 6-8x* 250GB SATA II HDDs, CentOS 4.4 or SuSe, DirectAdmin
* I prefer 8 HDDs (or actually 9) over 6 but I am not sure if their server chassis can hold that many HDDs, I am awaiting answer from them. They don't have any other drives beside the 250GB ones so I am limited to those.
The preferred SW RAID setup is to have everything in RAID 10, except for the /boot partition which has to be on RAID-1 or no RAID I believe, plus one drive as hot spare (that would be the 9th drive). I am quite sure they will not do the setup for me but will give me access to KVM over IP and a Linux image preinstalled on the first HDD so that I'll have a functional system that needs to be upgraded to RAID-10.
How do I do that? The big problem I see is that LILO or GRUB can't boot from a software RAID-5/10 so I will have to mount the /boot partition elsewhere. It's probably terribly simple...if you have done it before which I have not. I have read some articles on how to setup a RAID-5/10 with mdadm (e.g. [url] ) but they usually do not talk about how to setup the boot partition. Should it be setup as a small sized (100-200MB) RAID-1 partition spread over all of the drives in the otherwise RAID-10 array?
What about swap? Should I create a 4-8GB (I plan to upgrade the server RAM to 4GB in near future) RAID-1 swap partition on each of the disks or swap to a file on the main RAID-10 partitions. The second sounds simpler but what about performance? Is swapping to a file on RAID-10 array a bad idea, performance wise?
Is it possible to grow a RAID-10 array in a way similar to growing a RAID-5 array with mdadm (using two extra drives instead of one of course)? mdadm doesn't actually even mention RAID-10 despite it does support it without having to create RAID-0 on top of RAID-1 pairs if the support is in kernel, from what I know.
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Feb 25, 2009
How often do RAID arrays break? Is it worth having RAID if a servers hard drive goes down? I was thinking it may just be a better option to just have a backup drive mounted to my system and in the even of a system failure just pop in a new hard drive, reload the OS, and then reload all my backups?
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May 20, 2009
I have a new server and it is rather slow during raid 1 recovery after system installed
CPU: Intel Core2Duo E5200 Dual Core, 2.5Ghz, 2MB Cache, 800Mhz FSB
Memory: 4GB DDR RAM
Hard Disk 1: 500GB SATA-2 16MB Cache
Hard Disk 2: 500GB SATA-2 16MB Cache
root@server [~]# cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sdb1[1] sda1[0]
256896 blocks [2/2] [UU]
md1 : active raid1 sdb2[1] sda2[0]
2096384 blocks [2/2] [UU]
md2 : active raid1 sdb4[2] sda4[0]
480608448 blocks [2/1] [U_]
[=======>.............] recovery = 36.7% (176477376/480608448) finish=1437.6min speed=3445K/sec
the sync speed is just 3.4Mb/second and the total hours needs to be more than 40 hours
Also the server load is very high (nobody uses it)
root@server [~]# top
top - 07:00:14 up 16:55, 1 user, load average: 1.88, 1.41, 1.34
Tasks: 120 total, 1 running, 119 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.0%us, 0.2%sy, 0.0%ni, 99.7%id, 0.0%wa, 0.0%hi, 0.2%si, 0.0%st
Mem: 4148632k total, 747768k used, 3400864k free, 17508k buffers
Swap: 5421928k total, 0k used, 5421928k free, 569252k cached
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Oct 22, 2009
I am in the process of restructuring the infrastructure on our servers. I am thinking of using either RAID 5 (1 hot spare) vs RAID 10 as my 1U server has 4 HDD tray.
RAID 5 would have better capacity but RAID 10 has better overall performance. Which one do you guys go for a shared hosting server?
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Dec 23, 2008
Is it possible to turn a non raided setup into Linux software raid, while it is live, and if it's the OS drive? Can you even software raid the OS drive remotely? I've been thinking about doing it for the redundancy (and possible slight performance boost for reads, but doing it more for redundancy). I'm using CentOS.
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May 22, 2008
I want to take some data from a raid-disk (taken from a raid-1 sstem). Put it into a new system already, but this system doesn't have any raid.
When viewing "fdisk -l", it said /dev/sdb doesn't contain valid partition. Is there anyway I can mount it now? I am on CentOS 4 box
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Mar 24, 2009
MY server configure our drives with RAID-1.
How can I check it my server configure with 3ware or software raid ?
Also please advise me how can I monitor raid configuration that my raid is working fine or no ?
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Jul 11, 2008
I've been talking to the Planet about trading in my four and a half year old "SuperCeleron" (from the old ServerMatrix days) Celeron 2.4 GHz system for something new. As part of their current promotions, I've configured a system that looks decent:
Xeon 3040, 1 gig of RAM, 2x250GB hard disks, RHEL 5, cPanel+Fantastico, and 10 ips for $162.
Not too bad. I could bump up the ram to 2 gb for, I think, $12 more, which I'm thinking about and wouldn't mind some thoughts on. But, the thing that has me really confused is RAID. I like the idea of doing a RAID 1 setup with those two hard disks. But, the Planet wants $40/month for a RAID controller to do it. I really don't want to go over $200 a month!
Any thoughts on alternative redundancy strategies that might avoid that cost? Software RAID does not seem to be offered by the Planet, unless I can figure out how to do it after installation (is that possible?) Better ideas in general on the server?
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May 23, 2007
Just curious what your thoughts are on performance:
2 SCSI Drives 10k w/RAID 1
or
4 SATA 10k w/RAID 10
Prices are not too different with 4 drives just being a tad more.
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