Customers want to have a mix of the S824 SSD and HDD, using the extended functions ( 18 disks
) backplane (EJOP), and do not want to use the Easy Tier feature.
How to achieve ?
A.
Use RAID 5T2 configure all drives.
B.
on SSD and HDD ARRAY different configurations.
C.
The SSD installed in EJTM 8-Bay 1.8 SSD cage.
D.
Use backplane isolation, and put on the back side of the SSD , HDD on the other side .
Explanation:
B
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C: SSD cage
In addition to supporting HDDs and SSDs in the SFF-3 SAS bays, the expanded-function feature EJ0P supports a mandatory 8-bay, 1.8-inch SSD Cage (#EJTM). All eight bays are accessed by both of the integrated SAS controllers. The bays support concurrent maintenance (hot plug). SSD 1.8-inch drives such as the 387 GB capacity feature ES16 or ES17 are supported.
http://www-01.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/9/897/ENUS114-059/index.html&&request_locale=en
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B
Easy Tier
With the standard backplane (#EJ0N), the server can handle both HDDs and SSDs that are
attached to its storage backplane if they are on separate arrays.
The high function backplane (#EJ0P) can handle both types of storage in two different ways:
– Separate arrays: SSDs and HDDs coexist on separate arrays, just like the Standard SAS
adapter can.
– Easy Tier: SSDs and HDDs coexist under the same array.
When the SDDs and HDDS are under the same array, the adapter can automatically move
the most accessed data to faster storage (SSDs) and less accessed data to slower storage
(HDDs). This is called Easy Tier.
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