sumit.anand
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RE: Dell-r610 Server with PERC 6/i controller

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thanku Sir, Not only price actually  server is not going to use for live environment, its used in R&D purpose thats the reasontrying to use this with SATA.

1) One more thing if we go ahead with RAID configuration do we need to initialize it ?

2) what i have done is after configuring RAID-0 (without initialized)i removed one of HDD and trying to start ...its failed to boot....... and then i have insert back the HDD on same port again failed to boot but by doing (ctrl+r) found server hdd treat as foreign disk it seems i have lost data.... do you have any idea where m doing wrong ?

what i m trying to achieve is:

i) In case of RAID-0 (with 4HDD )if any of my disk got failed (either disk failed or by mistake this removed ) not want to loose data....

ii) In RAID-0 trying to increase storage size of server by adding another disk using next 2 empty slots ?

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theflash1932
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RE: Dell-r610 Server with PERC 6/i controller

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Not only price actually  server is not going to use for live environment, its used in R&D purpose thats the reasontrying to use this with SATA.

Sounds like price is a primary factor to me - can't justify higher cost of SAS just for R&D. SAS operates exactly the same as SATA as far as the OS and user are concerned. The controller just treats them differently. SAS is much more reliable and performance is higher.

1. Yes. You should always initialize newly-created virtual disks (arrays).

2. Two disks in RAID 0, you remove one, and it stops working. THIS IS NORMAL! RAID 0 stripes the data across all disks in the array. If you remove any of them, the stripe is incomplete, so NO data can be read. This is why you should never use RAID 0. Even a single read/write error will cause data loss/corruption. If you insist on using RAID 0, DO NOT remove any of the drives. In this instance, when the drive is showing as Foreign, it must be imported from the CTRL-R utility. That will probably bring the array back online, but every time it happens substantially increases the possibility of data loss.

i. There is no way to prevent data loss with RAID 0. With RAID 0, you WILL eventually need to resort to your backups. Even if no drives go offline/fail, you will eventually experience data loss.

ii. Yes, you can grow your 2-disk RAID 0 to a 4-disk RAID 0, but for all the reasons above, I would not do it. At a minimum, put in four disks and create a RAID 5. Four 250GB disks in a RAID 5 will give you 750GB of usable space; Four 2TB disks in a RAID 5 will give you 6TB of usable space. You should maximize your space by getting larger drives, not using RAID 0. Four 2TB disks in a RAID 10 would give you 4TB of usable space - this would be the ideal combination of speed and reliability for four disks. How much disk space do you need?

sumit.anand
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RE: Dell-r610 Server with PERC 6/i controller

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Thank you sir for  help and detailed information. 

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sumit.anand
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RE: Dell-r610 Server with PERC 6/i controller

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hello Sir, 

 I have new problem and that is some times with i have two SAS 300GB HDD, on which m using esxi5.1,  sometimes server dosent recognize os, and while checking raid status found one disk went to foreign disk and raid shows fail, and when i build raid again and restart the server, server starts with the same os which i was installed earlier 5.1. i want to know why raid fails, i dnt have any technical answer, i faced twice this situation and solved by creating raid again... 

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