RAID configurations for RHEL partition

We have RHEL 5.x in our production environment using VMware which is configured on RAID using RAID 1, RAID 5 & RAID 10. I had couple of queries with RAID configuration:
1) Is it possible for a RHEL partition to have 2 RAID configurations, like some part of partition on RAID 1 and the remaining on RAID 5?
2) How to identify the RAID configurations used by a RHEL partition.
I hope, I have been able to explain the problem.
Requesting a reply to my query.
Regards

1) Is it possible for a RHEL partition to have 2 RAID configurations, like some part of partition on RAID 1 and the remaining on RAID 5?
No. RAID configurations work on the block level and do not use logical partitions. You can however partition a RAID volume.
2) How to identify the RAID configurations used by a RHEL partition.
Depends what you are using. If you have a hardware RAID, it is transparent to the OS and cannot be seen without using any hardware specific host adapter utilities. If it is software, it depends on mdadm, LVM or BTRFS. What are you using?
P.S. you will most likely do not want to use RAID 5 unless you have special hardware controller to deal with RAID 5 checksums, etc. It's definitely not a solution for large storage, since it will take days to rebuild in case of a failure.

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RAID Configurations for Cisco servers

Hi All,
What is the RAID configuration for Cisco Appliance(Version 8.5) like CUCM, CUPS, CUIC, Unity etc?RAID Configuration will be done while installtion itself or we need to do it explicitly?
Regards,
Adithya

Hi Geoff,
Thanks for the reply. Just wanted to know whether if this RAID configuartion is similar to the other server RAID where we install Cisco applications.(Like OS & Application Software is RAID 1 and Database is RAID10).
Regards,
Adithya

Best Raid Configuration for a 8-1tb hhd server

Hi All,
I have been trying to figure out what would be the best raid configuration for my Windows 2012 essentials server. So I was wondering if I could get some advise on this. Here is what I would like to get out of this configuration.
I would like to split the 8-1tb drives into 2 VHD one with about 300gb for the OS to be installed on, and the rest to be use for storage. I want like to have good redundancy, fairly good read & write capabilities.
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You may be better of using Storage spaces and not using raid at all.
Robert Pearman SBS MVP
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What is the best RAID configuration for a MacPro as a Logic User?

There ought to be a universal answer to this question: what is the best RAID configuration for Logic Mac Pro users? I will be more specific.
I use Logic Studio, Reason, Ableton, and Motu Symphonic Instrument simultaneously.
I want to fail safe my precious audio files and improve performance as the system reads/writes data from multiple files, from audio tracks to digital samples.
I want to run video files simultaneously to do nifty audio soundtracking to video.
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HD 1: OS and Logic Studio, Reason/Ableton samples etc. software (non-raid) (250 GB)
HD 2/3: MIrrored RAID set for AUDIO FILES (500 Gb identical pair)
HD 4: Video files / Bouncing (1 TB)
Makes sense right? A disk for reading software. A pair of 500 GB disks for reading/writing audio files and sessions in mirrored array. A 1 TB disk for video and bouncing. The main question I have is, for audio files only, is striped or mirrored better? 64K blocks the best? And are there any more details. I assume to do this in Disk Utility.

Well, both Mirrored and Striped have their pros and cons. If you use mirrored, it will offer no better performance than the spec'ed drive along with it's sata bus speed. The plus point is, if one drive goes down, you have the second as a backup as the complete contents of one drive are mirrored on the other.
With striped you will get a performance boost because all files (for example a single project) will get written across both drives and hence split the load on the drives and the SATA busses. The drawback is that you'll have to make sure you have a good, regular backup schedule in place because when one of the drives goes to drive heaven, you're going to be stuffed without a full backup of both drives.
Exactly what performance boost you'd get will depend on your project, number of files, size of files, fragmentation of files, track count etc. You may find it would be easier to use the 3 drives straight, with no raid and have:
HD 1: OS and Apps. No samples at all.
HD2: Audio Files for Logic projects
HD3: Reason, Ableton, Logic etc instrument sample library
HD4: Video and bouncing.
Which is what I ended up doing although I use HD4 as an interchangeable backup for HD1 and 2.
There is no universal answer to this as each must make their own choice based on their preferences and needs. Mirrored will give you full backup but on-site, in machine backup. Not much good if something untoward and drastic happens to the physical machine. I think a few people toy with striped RAID but fall on the side of using the drives straight, as in their projects they don't see a big enough gain over splitting the data across your 3 remaining drives without RAID. Studios that seriously consider raid often go out and get a dedicated raid that can offer more variations than raid 0 or raid 1 (Striped and Mirrored) and better throughput.
I hope this helps a little and not just added to the dilemma.

Which RAID Configuration for my WD "My Book Mirror Edition"?

About to reformat my WD "My Book Mirror Edition" to use on my iMac. I hope to also install on my iMac "Virtual Box", "VM Fusion", or "Parallels" and then run a few windows products. Which RAID configuration should I choose in the WD "drive configurations" box?

If I were you I'd run any Virtual Machine directly on your iMac, not on a "WD My Book Mirror Edition", in particular not when connected through USB 2.0.
To store data, the WD is fine.
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RAID 1 ("mirroring"): more safe. If one disk fails, the data are recoverable as they are on the other disk as well. Disadvantage is you get only half the storage capacity compared to RAID 0.
Oh. my personal recommendation: RAID 1 is not an alternative to making a backup. So whatever option you choose: if you store valuable data on the disk that are nowehere else: back them up!
On formats:
HFS+ : definitely recommended if you only use the RAID array on the Mac.
FAT 32: if you also use it on a Windows machine. Note that files cannot be larger than 4 GB in this case.
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UCS 220: FlexFlash showing Raid configured on HV partition

Does someone knows how to remove a raid configured on a FlexFlash HV partition on UCS 220M3?
Thanks

Hi Sean,
This is a expected behavior since we have only SD card present.
This condition is filed under this defect:CSCuh20203. The fault is cosmetic.
UCSC 1.5 release notes should specify RAID degraded with 1 SD card.
Symptom:
FlexFlash Degraded RAID message with only 1 SD card
Conditions:
C220 M3, 1.5(1f) firmware
Workaround:
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Best RAID configuration for storing Datafiles and Redo log files

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OS version: Solaris
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Oracle recommends SAME - Stripe And Mirror Everything.
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X4500 RAID Configuration for best performance for video storage

Hello all:
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I'd put as many disks as possible into a RAID 5 (striping) set. This will provide the highest level of performance, with the ability to sustain a single disk failure.
With striping, some data is written to all the disks in the stripe set. So, if you have 10 disks in the set, then instead of writing data to a single disk, which is slow, 1/10th of the data is written to each disk simultaneously, which is very fast. In effect, the more disks you write to, the faster the operation completes.

Best practice RAID configuration for UCS C260 M2 for Unified Communications?

I have two UCS C260 M2 servers with 16 drives (PID: C260-BASE-2646) and I am trying to figure out what the best practice is for setting up the RAID.
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http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/virtual/CUCM_BK_CF3D71B4_00_cucm_virtual_servers/CUCM_BK_CF3D71B4_00_cucm_virtual_servers_chapter_010.html#CUCM_TK_C3AD2645_00
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Best RAID configuration for combining external thunderbolt enclosures?

I'm looking at configuring two external Western Digital Thunderbolt Duo drive enclosures using Disk Utility's software RAID setup tool. Each enclosure houses two 2TB drives. I'm looking to get the performance of RAID 0 striping with the redundancy of RAID 1 mirroring. What I'm not sure of, and I hope someone can shed some light on, is how to combine the RAID sets to achieve my desired goal. As I see it, there are two possible ways to go about this.
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Start here:
http://en.wikipedia.org/wiki/RAID
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Raid configurations for dummies...hmm

Warning! graphic material.
No I didn't make this up myself.
May be actually useful, (though I can't vouch for accuracy).
DId I say you have been warned.
• Raid

Unfortunately, the phrase "graphic material" is not sufficient for me to hit the link. I'm behind a corporate firewall that is armed with the most accurate and up to date sexual material filters and alarm systems you can imagine. Big Brother, his sister and all of his cousins are watching my machine's Internet traffic 24/7/365
bogiesan

Changing Raid configuration

we have changed the Raid 1 to a non-Raid configuration for testing purposes. Now we wanted to set the Raid 1 again in the configuration menu of the LSI Controller. But there it says, that all data will be erased. Isn't it possible to set one HDD as the primary HDD and mirror the data to the other HDD (this way is possible with server controllers)? If this isn't possible, how can I get the Raid 1 back, without losing Data and the Service partition... Perhabps creating Rescue and Recovery cds?
Thanks
Regards,
Christof

are you sure your primary drive was released from the array topography? it sounds like something is still being flagged as being part of an array.
if that's no help, try this:
- physically unplug both drives from your system
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- plug in the second drive
- set it to 'online' in disk management
- run MSM and see if it will let you create an array
somewhere along the way you might have to delete the LSI array from the boot menu in the D10 BIOS and re-enable it.
my gut feeling is that something is still flagged somewhere and needs to be unflagged for this to work.
ThinkStation C20
ThinkPad X1C · X220 · X60T · s30 · 600

TRIM does not work for SSD in a RAID configuration

According to Intel, SSDs that are used in a RAID configuration cannot use the TRIM function in Windows 7. This would seem to lead to an eventual degradation of those RAID SSD configurations. Is there any work ongoing to enable TRIM in the future?
"....Intel later clarified that TRIM was supported for the BIOS settings of AHCI mode and RAID mode, but not if the drive was part of a RAID volume.[16]..."
W520, i7-2820QM, BIOS 1.42, 1920x1080 FHD, 32 GB RAM, 2000M NVIDIA GPU, Samsung 850 Pro 1TB SSD, Crucial M550 mSata 512GB, WD 2TB USB 3.0, eSata Plextor PX-LB950UE BluRay
W520, i7-2760QM, BIOS 1.42 1920x1080 FHD, 32 GB RAM, 1000M NVIDIA GPU, Crucial M500 480GB mSata SSD, Hitachi 500GB HDD, WD 2TB USB 3.0
Solved!
Go to Solution.

The performance hit would only be on the write side of the equation. If the garbage collection of these SSD drives is sufficient, I wonder why TRIM exists? I'm posting an excerpt from Wikipedia on the subject below:
"All SSDs have garbage collection. That is a function of NAND flash memory used in SSDs. Some drives may be more efficient at GC than others. Some do not recover as well as others after they have been used for a period of time. Some drives perform GC in the background when the drive is otherwise not busy with user data (idle), but there are some drawbacks to that background operation (you can see the wikipedia article for more details). In general background GC is not good for the endurance of the drive because it moves data that the OS (and user) may delete and render unnecessary to GC in the first place. The best solution is to do it on the fly as fast as possible.
TRIM is a command sent by the OS to the drive identifying the actual logical block addresses (LBAs) that are no longer needed. To understand TRIM you must understand how the OS and SSD tracks the data. When you put an item in the OS trash you are not actually deleting the items. They are just marked ready for deletion. If the user says to empty the trash, the OS notes this and now says those LBAs are free to accept new data. This is true for all storage devices, not just SSDs. Many people do not realize that the storage device does not actually delete the data at that point. The act of erasing a file is simply the OS marking its internal lookup tables for that file as free to store new information. An HDD still has the data on the drive at that location until the OS writes something new into that spot. For an SSD it is the same; the SSD still has the data in the flash at that location until the OS writes something new into that spot. Of course the NAND flash memory requires the replacement data to be written into a new location and the old data is marked as "invalid" now. Then during garbage collection that invalid data is NOT moved with other valid data in that block to a new block.
The performance of an SSD is at its peak when it is brand new out of the box because there is nothing to GC. Unfortunately this occurs only at the beginning of the drive's life or after you secure erase the drive and start over. Performance is also affected by the size of the over provisioning (OP) (details also in the wikipedia article above). During GC if the drive does not have to move around as much data it can operate faster. The TRIM command enables the OS to tell the SSD what LBAs are no longer valid data. Without the TRIM command this only happens when the OS tries to write something new into that same spot or it tries to replace the current data. If the SSD knew in advance that some of the LBAs holding data were invalid the drive would not move that data during GC. The effect gets you closer to the performance of a drive with larger OP. Without the TRIM command the drive will perform like it is at full capacity at all times and only has the amount of OP set at the factory (plus any space left unused during the partition process when first setting up the drive)."
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W520, i7-2760QM, BIOS 1.42 1920x1080 FHD, 32 GB RAM, 1000M NVIDIA GPU, Crucial M500 480GB mSata SSD, Hitachi 500GB HDD, WD 2TB USB 3.0

Nominal configuration for boot drive and internal RAID setup

Hello, I'd appreciate some advice on the following please.
I'm planning the build of a Mac Pro to act mainly as a photo editing workstation.
Considering the following disc setup:
Bay 1. 500GB with two partitions - 150GB for OS X and remaining for applications
Bay 2. 250GB XP/Vista for occasional use. All Windows apps/data quarantined on this disk.
Bays 3 and 4. 2x 500GB RAID0 (backed up externally) for data and workspace.
WRT RAM, I've read that 4 matched DIMMs in the same riser is the optimal config, so looking at 4x 1GB.
I'd be grateful for any comments as to whether I'm on the right track here.
Thanks
Ben
Mac Pro Mac OS X (10.4.10)

I set up a similar configuration for photo editing. First, partitions are not as useful as they were in the pre OS X era. Just load your OS and all applications on the same drive as there is no benefit, as far as I know, to separating them into partitions. Second, your 4 X 1GB RAM should be split between the two risers, not on the same riser. Put two DIMMs in the first two slots of each riser. 4 X 1GB hits a sweet spot in the cost/benefit analysis as long as you don't need more than 4GB. I use Lightroom extensively and 4GB is plenty.

RAID Configuration Utility for KZPSC-XB in Alpha 2100

I have an Alphaserver 2100 and need to replace the RAID card KZPSC-XB. I believe I will need a diskette with the RAID Configuration Utility software on it to setup the RAID. The system is old, and I can not locate our original software.
Does anyone know where it can be located, downloaded, or a copy obtained?

Hi @rcyoung ,
Welcome to the HP forum!
To get your issue more exposure I would suggest posting it in the commercial forums since the Alpha Server is a commercial product. You can do this at Commercialforum/DiscussionBoards/server/alpha servers.
The support page for your product may be helpful in the meantime: AlphaServer 2100 Technical Resources.
I hope this helps.
Sparkles1
I work on behalf of HP
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RAID configurations for RHEL partition

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