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• &nbsp; &nbsp; &nbsp;5 Flash &nbsp; (RAID 4+1) &nbsp;- RAID-5<br />
• &nbsp; &nbsp; &nbsp;15 SAS (RAID 4+1) &nbsp; &nbsp; - RAID-5<br />
• &nbsp; &nbsp; &nbsp;NL –SAS &nbsp;(RAID 6+2) &nbsp;- RAID-6<br />
<br />
Not sure what EMC best-practice is but RAID-5 is not normally recommended for Business use anymore due to the extended rebuild times and the subsequent risk of a second disk failing before the rebuild completes - if this happens data is toast.
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Hi <br />
<br />
I am trying to expand a Storage Pool on a EMC VNX 5800 array. The existing Pool has 99 disks with a mixture of Flash, SAS and NL-SAS.<br />
<br />
When I try to expand it (using Unisphere) it will not allow me to expand by adding the disk below:<br />
• &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5 Flash &nbsp; (RAID 4+1)<br />
• &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;15 SAS (RAID 4+1)<br />
• &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;NL –SAS &nbsp;(RAID 6+2)<br />
<br />
Is there any limitations on expanding Storage Pools with this version of VNX?<br />
<br />
Many Thanks
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Hi 

I am trying to expand a Storage Pool on a EMC VNX 5800 array. The existing Pool has 99 disks with a mixture of Flash, SAS and NL-SAS.

When I try to expand it (using Unisphere) it will not allow me to expand by adding the disk below:
•	5 Flash   (RAID 4+1)
•	15 SAS (RAID 4+1)
•	NL –SAS  (RAID 6+2)

Is there any limitations on expanding Storage Pools with this version of VNX?

Many Thanks

VNX 5800 - expanding storage pool issue.

Storage devices include any device used for storing and retrieving digital information. Hard disk drives (HDDs) use one or more rigid ("hard") rapidly rotating disks (platters) coated with magnetic material. Data is accessed in a random-access manner, meaning that individual blocks of data can be stored or retrieved in any order and not only sequentially. The primary competing technology for secondary storage is flash memory in the form of solid-state drives (SSDs), but HDDs remain the dominant medium for secondary storage due to advantages in price per bit and per-device recording capacity. CD-RW (Compact Disc-ReWritable) is a digital optical disc storage format that allows information to be stored outside the mechanical HDD.

Storage Hardware

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.