Maximum safe fill for Raid-5 without hot spare?

What is the percentage of total capacity that can be used while still maintaining security blanket of the RAID-5 parity data?
I have two 7-drive arrays, neither include a spare, and simple logic suggests that the total data should not exceed the formatted capacity of six of the seven drives. Is it possible that six drives could manage, say, six-and-a-half drives worth of data via parity data, in the event the seventh drive fails?
Various G4 Mac OS X (10.4.8)

In addition to William's comment re utilization, the maximum space you can get from a 7-disk RAID 5 volume is 6 drives-worth.
That is, seven 500GB drives results in 6 x 500GB usable space, or 3,000 GB. It is not possible to extend the usable space into the seventh drive.
In RAID 5, all data is spread across all drives in the array, so there isn't actually a spare drive, or a single parity drive. RAID 3 uses a separate parity disk, but even in that configuration you cannot use space on the parity drive as user data because it's little more than a 1:1 map of the blocks on the data drives - any data on the parity space is interpreted as the parity data for the corresponding blocks on the other drives. If you stored real data in that space it would totally hose the corresponding data on the user-space disks.

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Quote
i looked everywhere and can't find any answer on how high should be the limit for onboard GPU overclocking
Every place except the one it might be found? The Intel datasheet?

Replace Disk RAID 5 with hot spare disk form old disk

i'm going to replace a failed disk form server Proliant SL360 G5 and using RAID 5 with a disk has been used from older server.
my question is there any side effect in RAID 5 on server that has been replace from a failed disk with the old disk?

Hello @Oktandri,
I understand that you are replacing a failed disc on your Proliant Servier and are wondering if there are any side effects that you should be aware of. I am sorry, but to get your issue more exposure, I would suggest posting it in the commercial forums, since this is a commercial product. You can do this at HP Enterprise Business Community - Servers.
I hope this helps. Thank you for posting on the HP Forums. Have a great day!
Please click the "Thumbs Up" on the bottom right of this post to say thank you if you appreciate the support I provide!
Also be sure to mark my post as “Accept as Solution" if you feel my post solved your issue, it will help others who face the same challenge find the same solution.
Dunidar
I work on behalf of HP
Find out a bit more about me by checking out my profile!
"Customers don’t expect you to be perfect. They do expect you to fix things when they go wrong." ~ Donald Porter

Can you run RAID 5 + Hot Spare on ix4-200d, or just RAID 5?

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Hello trevorsem
The ix4-200d would only be able to do RAID 5. Hot spare would not be an option. You could technically use only 3 disks in the RAID 5, but it would not be using the unit to it's best ability.
PX class devices can use hot spares with RAID 1, 5, 6, and 10
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Px4-300r setup raid 5 + hot spare

I bought a px4-300r NAS and in the spec I see it is possible to make a raid 5 with hot spare. I configured a raid 5 with 3 disk but I don't know how to set up the hot spare with drive 4 ?
LenovoEMC™ px4-300r
Version : 4.0.6.19294
BIOS : PX4 FSBFV102
tks
Solved!
Go to Solution.

Did you actually read the manual before posting this question?

Why is hot spare in use while disk state is Okay

In my Solaris 10 RAID-5 volume, metastat shows the hot spare in use, but all the disks' state is Okay. Why is this? I do suspect the first disk was bad at one time, and may have been pulled out and re-inserted in without issuing any solaris commands. Please help explain why, and how to recover from this situation. Thanks.
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Original device:
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Device Start Block Dbase State Reloc Hot Spare
/dev/dsk/c10t500000E01013A380d0s2 10506 No Okay Yes /dev/dsk/c10t20000004CFAA17C8d0s2
/dev/dsk/c10t500000E01013A230d0s2 10506 No Okay Yes
/dev/dsk/c10t500000E01012D7A0d0s2 10506 No Okay Yes
/dev/dsk/c10t500000E010128CE0d0s2 10506 No Okay Yes
/dev/dsk/c10t20000004CFC22131d0s2 10506 No Okay Yes
/dev/dsk/c10t500000E01012D7B0d0s2 10506 No Okay Yes
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hsp000: 1 hot spare
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/dev/dsk/c10t20000004CFAA17C8d0s2 In use 143349312 blocks Yes
Device Relocation Information:
Device Reloc Device ID
/dev/dsk/c10t500000E01013A800d0 Yes id1,ssd@n500000e01013a800
/dev/dsk/c10t500000E01013A850d0 Yes id1,ssd@n500000e01013a850
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/dev/dsk/c10t500000E01013B270d0 Yes id1,ssd@n500000e01013b270
/dev/dsk/c10t20000004CFAA17C8d0 Yes id1,ssd@n20000004cfaa17c8
/dev/dsk/c10t500000E01013A380d0 Yes id1,ssd@n500000e01013a380
/dev/dsk/c10t500000E01013A230d0 Yes id1,ssd@n500000e01013a230
/dev/dsk/c10t500000E01012D7A0d0 Yes id1,ssd@n500000e01012d7a0
/dev/dsk/c10t500000E010128CE0d0 Yes id1,ssd@n500000e010128ce0
/dev/dsk/c10t20000004CFC22131d0 Yes id1,ssd@n20000004cfc22131
/dev/dsk/c10t500000E01012D7B0d0 Yes id1,ssd@n500000e01012d7b0
/dev/dsk/c10t20000004CFAF377Fd0 Yes id1,ssd@n20000004cfaf377f

Thanks for the suggestion. Tried "metahs -e ...". "Hotspare isn't broken, can't enable".
Tried "metareplace -e ...", "d10: device ... enabled" It's currently in sync'ing mode. I guess drive 380 was pulled out and reinserted at one point without issuing the metareplace command.
Edited by: user8636975 on Nov 29, 2011 8:05 PM

Maximum HD size for MDD G4?

Hi there
I had a real pain in the proverbial when trying to do a clean install of Panther (or Tiger) on a 1Ghz G4 on a new 200 Gb HD. There were instablilities, Hands on shout down/restarts, etc, before running any updates or 3rd party apps.
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Some RAM that worked under prior versions of OS X has been known to fail. Tiger makes much more use of all available RAM for cache is part of the reason. Memtest would give it a good workout overnight.
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Hello all,
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>>>
You can never be too safe with data, but if you follow the hot-spare, extend raid set and rebuild sequence, it is not necessary. Your data will be reconsructed automatically. That is the reason you use a raid3/5.
Your log file is a definite show of a serious disk problem. Replace it, create a hot-spare, extend your raid set and rebuild (it should be done automatically) and you are ready to roll
>>>>
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WHEW!
Rowby
Message was edited by: rowby

WEB BROWSER-BASED CONFIGURATION
132
6.6.5 Check Volume Set
To check a volume set from a RAID set:
(1). Click on the “Check Volume Set” link.
(2). Click on the volume set from the list that you wish to check.
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and comparing the results to the contents of the dedicated parity
disk drive. The checking percentage can also be viewed by clicking
on “RAID Set Hierarchy” in the main menu.
Directly from the Areca 1600 series Manual. I would let that finish.
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ADK

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There are intructions on this page for how to create a new account without giving credit card details : http://support.apple.com/kb/HT2534
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How can I tell if HD is set up for RAID?

I received an external Western Digital 4TB drive with some files on it and I'm trying to tell if the drive is already set up for RAID or not. The company I received it from couldn't tell me and according to the WD box, it's "pre-configured for maximum capacity (RAID 0)". However, when I go into Disk Utility to view the drive, it says the capacity is only 1.8T.
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There is no such thing as a "RAID" drive. Any drive can be used in a RAID array. A single drive is not a RAID drive. It is simply a single drive. When multiple drives are combined into an array via software and/or hardware then one has a RAID array.
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You are right.
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I was just researching the very same thing, though it does not sound like my studio setup will be as sweet as yours. Here are a few things I ran across:
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Replace the Hot Spare that Shared between Raid 1 and raid 5

I have ProLiant ML370 G6 with Smart Array P410i Controller on System Board
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Hello Amostafa,
Welcome to the HP Forums, I hope you enjoy your experience! To help you get the most out of the HP Forums I would like to direct your attention to the HP Forums Guide First Time Here? Learn How to Post and More.
I understand that you are looking to rebuild the hot spare drive on your ProLiant system, and I would be happy to guide you towards a resolution!
I am sorry, but to get your issue more exposure, I would suggest posting it in the commercial forums, since this is a commercial product. You can do this at:
http://h30499.www3.hp.com/t5/ProLiant-Servers-ML-DL-SL/bd-p/itrc-264
I hope this helps!
Regards
MechPilot
I work on behalf of HP
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the right to say “Thanks” for helping!

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Regards,
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Hi
On OSM side should exist SAF agent for sending messages to AIA queue's and same on AIA side for sending to OSM queue's. You can even combine SAF agaent on one direction and bridge's in another direction but you'll have to do it manually in that case.
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best regards
Tomac

Maximum safe fill for Raid-5 without hot spare?

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