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and it shouldnt matter if I mix MD1220 and MD1200?
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and it shouldnt matter if I mix MD1220 and MD1200?

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no it doesn't matter just the maximum # of drives is important
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no it doesn't matter just the maximum # of drives is important

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I presume this is solved but just to add you can mix 2.5 and 3.5 inch drives in RAID, in fact if you unplug the sleds you may find the disk inside the 3.5 inch caddy is a 2.5 inch disk.
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I presume this is solved but just to add you can mix 2.5 and 3.5 inch drives in RAID, in fact if you unplug the sleds you may find the disk inside the 3.5 inch caddy is a 2.5 inch disk.

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There are two SQL servers connected to a PowerVault MD3200 DAS. This MD3200 is connected to a PowerVault MD1200 for additional storage.<br />
These are both using 3.5&quot; drives. <br />
I am looking to expand the storage for both the SQL servers and am looking into attaching another MD1200 or maybe an MD1220.<br />
I read the Dell guidebook and it looks like it should be possible to attach an MD1220 to this setup:<br />
<a href="http://www.dell.com/downloads/global/products/pvaul/en/powervault-md3200-md3220-technical-guidebook-en.pdf" rel="ugc">http://www.dell.com/downloads/global/products/pvaul/en/powervault-md3200-md3220-technical-guidebook-en.pdf</a><br />
<br />
Even though the MD1220 uses 2.5&quot; drives, looks like it should not be an issue as long as the disks are not used in the RAID as the 3.5&quot;? (they won't be)<br />
Is this guaranteed to work or is there something else on the SQL servers and/or DAS I need to check first before expanding?
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There are two SQL servers connected to a PowerVault MD3200 DAS. This MD3200 is connected to a PowerVault MD1200 for additional storage.
These are both using 3.5" drives. 
I am looking to expand the storage for both the SQL servers and am looking into attaching another MD1200 or maybe an MD1220.
I read the Dell guidebook and it looks like it should be possible to attach an MD1220 to this setup:
http://www.dell.com/downloads/global/products/pvaul/en/powervault-md3200-md3220-technical-guidebook-en.pdf

Even though the MD1220 uses 2.5" drives, looks like it should not be an issue as long as the disks are not used in the RAID as the 3.5"? (they won't be)
Is this guaranteed to work or is there something else on the SQL servers and/or DAS I need to check first before expanding?

Expanding storage for MD3200 already connected to MD1200

Computer data storage, often called storage or memory, is a technology consisting of computer components and recording media used to retain digital data. In addition to local storage devices like CD and DVD readers, hard drives and flash drives, solid state drives can hold enormous amounts of data in a very small device. Cloud services and other new forms of remote storage also add to the capacity of devices and their ability to access more data without building additional data storage into a device.

Storage

SQL (Structured Query Language) is designed to be used in conjunction with relational database products as of a means of working with sets of data. SQL consists of data definition, data manipulation, and procedural elements. Its scope includes data insert, query, update and delete, schema creation and modification, and data access control.

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