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PERC 5/i RAID Card: Tips and Benchmarks - Page 653

post #6521 of 7184
The nest question is, does the 6i allow for multiple VDs in RAID10?
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post #6522 of 7184
I can test this for you in a few days as i just got my perc 6i in

Will only test to see if it softwar wise lets you, i wont initialise them as i'll be then making my raid 6 on the beast (6x2TB)
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post #6523 of 7184
Awesome, thanks.
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post #6524 of 7184
Quote:
Originally Posted by Norse View Post

I can test this for you in a few days as i just got my perc 6i in

Will only test to see if it softwar wise lets you, i wont initialise them as i'll be then making my raid 6 on the beast (6x2TB)
I would like to have that my self. thumb.gif
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post #6525 of 7184
Quote:
Originally Posted by mahirzukic2 View Post

I would like to have that my self. thumb.gif

hehe its fun but im now in the process of copying 5.1TB to raid 0 2x3TB so i can recreate my raid on the perc 6 as Raid 6. currently it thinks 100 hours
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post #6526 of 7184
I must say, I think it would be better to have a single RAID5 array and then partition it within ESXi. You're not helping the card out by having 2 separate parities that must be calculated on the same disk, and if a disk were to fail you have 2 different arrays to be built at the same time instead of one, stressing the array further.

On the other hand, having 2 virtual disks in ESXi keeps only a single parity calculation on the PERC's end while separating the data logically.

On the PERC 6, you can only have 1 RAID 10 array per set of disks - so 8 disks could be 2 arrays, but 4 disks could not. You also cannot do online expansion of RAID 10, 50, or 60 with the PERC 5 and 6, but I believe you can with the H700.

In short, having multiple RAIDs on the same set of disks =/= best practice, leave it to VMWare to logically separate it.
post #6527 of 7184
Quote:
Originally Posted by mcdanielvzw View Post

I must say, I think it would be better to have a single RAID5 array and then partition it within ESXi. You're not helping the card out by having 2 separate parities that must be calculated on the same disk, and if a disk were to fail you have 2 different arrays to be built at the same time instead of one, stressing the array further.

On the other hand, having 2 virtual disks in ESXi keeps only a single parity calculation on the PERC's end while separating the data logically.

On the PERC 6, you can only have 1 RAID 10 array per set of disks - so 8 disks could be 2 arrays, but 4 disks could not. You also cannot do online expansion of RAID 10, 50, or 60 with the PERC 5 and 6, but I believe you can with the H700.

In short, having multiple RAIDs on the same set of disks =/= best practice, leave it to VMWare to logically separate it.
That's the thing, what happens if the user is not using WMWare, but rather this setup on his Windows, like most of the people do. I do too.
Quote:
Originally Posted by Norse View Post

hehe its fun but im now in the process of copying 5.1TB to raid 0 2x3TB so i can recreate my raid on the perc 6 as Raid 6. currently it thinks 100 hours
Any time you are doing such a task (copying huge amounts of data, probably consisting of a large number of small files as well), you should always do a clone from one place to another with some software (I use Acronis True Image Home), as it copies bytes (rather Terabytes biggrin.gif) of data, and not file by file, such as Windows does it.

This can reduce the time needed to copy very easily by 3-5x, in your case 20-30 hours would be required for the completion of such task.
Edited by mahirzukic2 - 5/22/13 at 1:17am
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post #6528 of 7184
Quote:
Originally Posted by mahirzukic2 View Post

That's the thing, what happens if the user is not using WMWare, but rather this setup on his Windows, like most of the people do. I do too.
Any time you are doing such a task (copying huge amounts of data, probably consisting of a large number of small files as well), you should always do a clone from one place to another with some software (I use Acronis True Image Home), as it copies bytes (rather Terabytes biggrin.gif) of data, and not file by file, such as Windows does it.

This can reduce the time needed to copy very easily by 3-5x, in your case 20-30 hours would be required for the completion of such task.

I am using software called Mirror Folder, it keeps two locations identical.
I'll keep it running until i am safe that the perc 6 is running fine just so i dont lose the whole array kinda thing

Its about 600k of files from memory
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post #6529 of 7184
Quote:
Originally Posted by mahirzukic2 View Post

That's the thing, what happens if the user is not using WMWare, but rather this setup on his Windows, like most of the people do. I do too.
Any time you are doing such a task (copying huge amounts of data, probably consisting of a large number of small files as well), you should always do a clone from one place to another with some software (I use Acronis True Image Home), as it copies bytes (rather Terabytes biggrin.gif) of data, and not file by file, such as Windows does it.

This can reduce the time needed to copy very easily by 3-5x, in your case 20-30 hours would be required for the completion of such task.

Same deal, I would recommend a single RAID array per set of disks. Realistically if you want to separate windows from your data you should have a separate disk or set of disks, and do whatever RAID you want there (1,5,10,0). When it comes to Windows, OS and Data should be on different disks if you want to separate it, not on different arrays on the same disk.

Alternatively, you could still logically separate the volumes with windows partitioning - you just have to be much more careful if you need to reinstall your OS (hence why you should do what I recommended above in this same post). These days you can even get a good sized SSD for your OS and call it a day (image/back it up to your data array or RAID1 with 2).

I've been using Allway Sync, it synced 1.5 tb's of data in just a few hours (5 or 6 I think)
Edited by mcdanielvzw - 5/22/13 at 3:27pm
post #6530 of 7184
Hello,

First sorry for my limited english, and sorry to not have read all the ~ 670 pages of the thread ;-)

I am building a mini home server, with a PC-Q08 case, and 6 x 2 Tb drives. I already have a Perc 5/i with 512 Mb + battery module, but I still miss the mainboard (Mini-ITX) and CPU... I am looking for something fully compatible with the Perc, to run ESXi, but something needing as little power as possible, since the box is going to run 24/24 but most of the time will be "idle"... If some of you have ideas, or maybe examples of consumption of your hardware, I am interested.

Thanks !
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