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I just found this site: RAID Performance Calculator - WintelGuy.com
I can't comment on its accuracy, but it suggests that a RAID-5 made of 4 drives each doing 170 MB/S (A WD-Blue SATA 4TB drive is rated up to 185 MB/s) and 90% write (assuming you're doing a backup ...) you should be seeing 183 MB/s for RAID-5 and 357 (!) MB/s for RAID 10. Now eSATA should be able to handle up to 600 MB/s, so something is not right. Does the manufacturer have a help site you could consult? Maybe a user/support group out there somewhere. Maybe it's just a sucky RAID implementation, all round. I'd at least check the manufacturers Web site to see if there's a firmware update that might solve things.
"A little song, a little dance, a little seltzer down your pants"
Chuckles the clown
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k5054 wrote: Maybe it's just a sucky RAID implementation, all round
That's what I suspect. I'll have a look at their web site, but I'm always a little nervous about firmware updates.
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What you currently have is only slightly better than a brick, so it doesn't seem like you'd loose all that much 
"A little song, a little dance, a little seltzer down your pants"
Chuckles the clown
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Re-read my first message. It's now performing well within acceptable range (to me) using RAID-10. I'm not going to re-try RAID-5.
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I'm the person who suggested going to RAID-10 for both safety and speed. The fact that RAID-5 was so slow tells me that there is no hardware support on that enclosure for the RAID-5 calculations and it was being done entirely in software.
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I'm guessing it was a poor RAID-5 implementation.
Do note also that I've installed zero software for this, so the parity computation still has to be done by something in the enclosure, and not the CPU of the system it's connected to...
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Wordle 1,042 4/6
⬛⬛🟨⬛⬛
⬛🟨🟨🟨⬛
🟩🟩⬛🟩🟩
🟩🟩🟩🟩🟩
Never heard of the word... hit n try with last letter.
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Wordle 1,042 3/6
⬜⬜🟨⬜⬜
🟨🟨⬜⬜⬜
🟩🟩🟩🟩🟩
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Wordle 1,042 4/6
⬜⬜🟨⬜⬜
⬜⬜⬜🟩⬜
⬜🟩⬜🟩⬜
🟩🟩🟩🟩🟩
Had to look it up.
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Wordle 1,042 3/6*
🟨⬜⬜⬜⬜
🟨⬜🟨🟩⬜
🟩🟩🟩🟩🟩
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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Wordle 1,042 6/6
⬜⬜🟨⬜⬜
⬜⬜⬜⬜⬜
⬜⬜🟨⬜⬜
🟨🟨⬜🟨⬜
⬜🟩🟩🟩🟩
🟩🟩🟩🟩🟩
Sandeep Mewara wrote: Never heard of the word... hit n try with last letter.
Same!
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⬜⬜🟨⬜⬜
🟨🟨⬜⬜⬜
🟨🟨⬜🟩🟩
🟩🟩🟩🟩🟩
In a closed society where everybody's guilty, the only crime is getting caught. In a world of thieves, the only final sin is stupidity. - Hunter S Thompson - RIP
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Wordle 1,042 5/6*
🟨⬛⬛⬛⬛
⬛⬛🟨🟩⬛
🟨⬛⬛🟩⬛
⬛🟩⬛🟩⬛
🟩🟩🟩🟩🟩
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Wordle 1,042 4/6*
⬜⬜🟨⬜⬜
🟨⬜⬜⬜⬜
🟨🟩⬜🟨⬜
🟩🟩🟩🟩🟩
Happiness will never come to those who fail to appreciate what they already have. -Anon
And those who were seen dancing were thought to be insane by those who could not hear the music. -Frederick Nietzsche
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Wordle 1,042 3/6
⬛⬛🟨⬛⬛
🟨⬛🟩⬛⬛
🟩🟩🟩🟩🟩
If it would've been an easier word, I would've gotten 6/6. 
Jeremy Falcon
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Wordle 1,042 4/6
🟨🟨🟨⬜⬜
🟨🟨🟨⬜⬜
🟩🟩⬜🟩🟩
🟩🟩🟩🟩🟩
New word learnt today.
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Wordle 1,042 5/6
⬛⬛⬛🟨🟩
⬛⬛🟨🟩🟩
🟨⬛⬛🟩🟩
🟨🟩🟨🟩🟩
🟩🟩🟩🟩🟩
What does it even mean - stoopid word!
Ok, I have had my coffee, so you can all come out now!
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I'm crylaughing at myself. I forgot how to enforce operator precedence in parsing code.
I've written it countless times. I have no idea how I forgot. It should be practically muscle memory at this point.
Next I will forget my birthday. 
Check out my IoT graphics library here:
https://honeythecodewitch.com/gfx
And my IoT UI/User Experience library here:
https://honeythecodewitch.com/uix
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honey the codewitch wrote: Next I will forget my birthday.
Just don't forget your SO's birthday... 
Freedom is the freedom to say that two plus two make four. If that is granted, all else follows.
-- 6079 Smith W.
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Any operator who slips you a twenty gets precedence.
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Pretty sure you already got it back. Anyway my 30 years old notes, based on a Modula2 publication from Niklaus Wirth 
Expression
\
SimpleExpression {Relation SimpleExpression}
\ \
\ "=="¦"!="¦"<"¦"<="¦">"¦">="
\
["+"¦"-"] Term {AddOperator Term}
\ \
\ "+"¦"-"¦"||"
\
Factor {MulOperator Factor}
\ \
\ "*" ¦ "/" ¦ "&&"
\
Number
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Variable
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| Designator
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|
String
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| """ {Aplha¦Digit} """
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FunctionCall
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| Designator [ParameterList]
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"(" Expression ")"
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Negation
\
"!"
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Thanks, but I can write a grammar for it. I just forgot how to write the code. :P
Check out my IoT graphics library here:
https://honeythecodewitch.com/gfx
And my IoT UI/User Experience library here:
https://honeythecodewitch.com/uix
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Not clear on what happened.
Did you forget to put operator precedence enforcement into the program, or did you forget how to implement operator precedence enforcement?
The difficult we do right away...
...the impossible takes slightly longer.
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Sadly, I came to this thread to read about bicycles  I recently acquired a Circus Bike and that will make you feel like you truly can't ride a bike! Now back to your regularly scheduled programming.
Hogan
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