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Author Topic: 4K Physical Sector Performance issue  (Read 84673 times)

dP21

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  • Posts: 10
Re: 4K Physical Sector Performance issue
« Reply #75 on: April 10, 2010, 10:54:31 PM »

maybe you ran out of memory, try
Code: [Select]
swapon /dev/sda1before running mke2fs

That did it TimeZlicer.  Thanks for all your help, couldn`t have done it without you!
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TimeZlicer

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  • Posts: 78
    • TimeZlicer
Re: 4K Physical Sector Performance issue
« Reply #76 on: April 11, 2010, 06:18:55 AM »

 ;D cheers!
That did it TimeZlicer.  Thanks for all your help, couldn`t have done it without you!
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ranran

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Re: 4K Physical Sector Performance issue
« Reply #77 on: April 16, 2010, 09:57:46 AM »

Hello,
Maybe I'm asking too much but could somebody who successfully managed to re-align and format (RAID 1) write a short summary or step by step of what needs to be done from the very beginning when you install fun_plug up to the end.  

Just by searching on google I found a lot of other guys out there struggling with the same issue. Even from Dlink tech team would be nice if somebody would write a step by step or a summary for a beginner linux user.

I 2nd this..and nominate TimeZlicer... :)  Hey, I'll offer you a batch of choc. chip cookies made by my daughter! :)
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TimeZlicer

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    • TimeZlicer
Re: 4K Physical Sector Performance issue
« Reply #78 on: April 16, 2010, 05:27:44 PM »

gee... thanks! i have tried before and was not successful...
will give it another go...
I 2nd this..and nominate TimeZlicer... :)  Hey, I'll offer you a batch of choc. chip cookies made by my daughter! :)
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m2k3423

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Re: 4K Physical Sector Performance issue
« Reply #79 on: April 18, 2010, 04:04:16 AM »

I ran some iozone tests on 4K sector drive, and the key is not to write in 4K-8K chunks., other than this, it works well. Why there is a perception that it only affects Windows is because by default, NTFS uses 4K cluster.  For Linux, depends on how you mke2fs, the block size stride all play a part.
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ranran

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  • Posts: 6
Re: 4K Physical Sector Performance issue
« Reply #80 on: April 20, 2010, 09:12:06 AM »

gee... thanks! i have tried before and was not successful...
will give it another go...

you tried to format the drives to work the the NAS unsuccessfully or tried to write up a guide?  Sorry, just a bit confused there...... :)

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TimeZlicer

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    • TimeZlicer
Re: 4K Physical Sector Performance issue
« Reply #81 on: April 20, 2010, 06:42:34 PM »

i was unsuccessful when i tried to create aligned raid partitions...
you tried to format the drives to work the the NAS unsuccessfully or tried to write up a guide?  Sorry, just a
bit confused there...... :)
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ranran

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Re: 4K Physical Sector Performance issue
« Reply #82 on: April 22, 2010, 06:00:08 AM »

i was unsuccessful when i tried to create aligned raid partitions...

Hrrrrm... that's not good.  I had hoped to use two 2TB EARS drives in RAID config.

You're saying it's not as "simple" as I  thought to just format the two drives identically in Linux then setup the RAID array, eh?

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ranran

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  • Posts: 6
Re: 4K Physical Sector Performance issue
« Reply #83 on: April 22, 2010, 08:32:00 AM »

Hrrrrm... that's not good.  I had hoped to use two 2TB EARS drives in RAID config.

You're saying it's not as "simple" as I  thought to just format the two drives identically in Linux then setup the RAID array, eh?

Eh, I'm too old for this hassle, going to return to Newegg and get the Sammy 2TB F3EG's. Ah well, glad I hadn't opened them yet...
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sbixby

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Re: 4K Physical Sector Performance issue
« Reply #84 on: May 06, 2010, 10:51:02 AM »

Anyone with progress to report on getting EARS partitions realigned for 4K?

I have my 323 up and running with the hardware and RAID0, but I haven't yet tried to realign, based on time constraints and reports of no-success.

I might take a crack at it this weekend; since I haven't yet used it to store data I'm not concerned about trashing the partitions.
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dcmwai

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  • Posts: 42
Re: 4K Physical Sector Performance issue
« Reply #85 on: May 08, 2010, 12:17:47 PM »

Finally, I manage to get the RAID1 with the alignment things.
It wasn't that hard but it do take times. (I'm not too sure why but there are 2 re-sync happeded)

Below are the guide.

http://docs.google.com/document/pub?id=1FIcG6ORtV9yqIK-4MLNgNLlQeHOb3Fxpu_OpLbd4Npg

Fell free to let me know if you encounter any issue.

Thank You
« Last Edit: May 08, 2010, 12:19:50 PM by dcmwai »
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TimeZlicer

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    • TimeZlicer
4K Physical Sector Performance issue
« Reply #86 on: May 08, 2010, 03:38:41 PM »

i salute you efforts, great post!  :o
Finally, I manage to get the RAID1 with the alignment things.
It wasn't that hard but it do take times. (I'm not too sure why but there are 2 re-sync happeded)

Below are the guide.

http://docs.google.com/document/pub?id=1FIcG6ORtV9yqIK-4MLNgNLlQeHOb3Fxpu_OpLbd4Npg

Fell free to let me know if you encounter any issue.

Thank You
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dcmwai

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  • Posts: 42
Re: 4K Physical Sector Performance issue
« Reply #87 on: May 09, 2010, 09:06:50 PM »

I wonder anyone would test it on a RAID5 and see if the WDC Engineer was correct on saying that it don't support that.

However I do suggest that you turn off the Disk hibernation as it seem that the spin time is higher then normal after the HDD go hibernation.

And I wonder if it can harm the array by declaring it removed...
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IcyMidnight

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Re: 4K Physical Sector Performance issue
« Reply #88 on: May 12, 2010, 09:13:23 PM »

Finally, I manage to get the RAID1 with the alignment things.
It wasn't that hard but it do take times. (I'm not too sure why but there are 2 re-sync happeded)

Below are the guide.

http://docs.google.com/document/pub?id=1FIcG6ORtV9yqIK-4MLNgNLlQeHOb3Fxpu_OpLbd4Npg

Fell free to let me know if you encounter any issue.

Thank You

Awesome, thanks! I'm using this guide to get myself set up now. ;D

I noticed that you didn't realign the last partition on each drive. Why did you choose not to do that?
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dcmwai

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  • Posts: 42
Re: 4K Physical Sector Performance issue
« Reply #89 on: May 13, 2010, 04:00:18 AM »

This is the guide for single HDD.
Well actually if you are following the thread you would be able to do that already.

But still having a guide would be better.

http://docs.google.com/document/pub?id=1ZnfQ8kvkBAHSa4EsT9kRPzPVxLz1zU2MLQKLmMROF7A

Thank You
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