Dell DAE Manual de instalación descargar pdf (Pagina 7)

capacity drive in the RAID group. This usually coincides with the capacity of the

replaced drive.

• Rotational speed – ATA and SATA-II drives currently have a rotational speed of

7,200 revolutions per minute (rpm). Fibre Channel drives that rotate at 7,200, 10,000,

or 15,000 rpm are available.

• Backend speed – EMC provides two different back-end speed drives for CX3

systems. The two available speeds are 4 Gb/s or 2 Gb/s.

• Vault and database drives – Drives 0, 1, 2, 3 and 4 in the first DAE in a Dell/EMC

CX Series contain the vault. These are 10,000 or 15,000 rpm FC drives and can be

of any capacity or back-end speed. The vault drives are special because they contain

configuration information, the write cache dump area, and other information that is

used by the Dell/EMC CX Series. The vault drives are also the storage area that

protects the write cache in case of a power failure.

RAID groups

This section provides specific guidance for RAID groups.

RAID group general

1. Put the same capacity drives in the same RAID group. The RAID group will be

created at the capacity of the lowest capacity drive. Extra space on the bigger drives

will be wasted.

2. Put same speed drives in the RAID group. This maximizes the service capability of

the group.

3. Mixing ATA and Fibre Channel drives is not allowed in the same RAID group. This is

enforced by the Navisphere management software.

Fibre Channel drives

For 80 percent of the general-usage configurations use RAID 5: 4+1, 8+1. Any number of drives

between 3 and 16 can be used, but RAID groups of this size are generally easier to configure and

manage within a single DAE chassis.

For 80 percent of OLTP configurations, use RAID 5: 4+1, 8+1 for data files (index and/or tables)

and RAID 1/0: 1+1 for OLTP log files. Refer to “Application profiles” for application-specific

modifications to these recommendations.

ATA drives

For ATA and SATA-II drives use RAID 3 4+1 or 8+1. ATA and SATA-II drives should be used for

archival or media applications, whose I/O patterns are sequential in nature. FLARE

has been

tuned to maximize this capability for ATA and SATA-II drives when using RAID 3. When using

RAID 3, ensure that write cache is enabled for the LUNs.

All LUNs created from ATA drives in the same DAE should be assigned the same default storage

processor (SP). This guideline does not apply to SATA-II drives.

Dell/EMC CX Series Initial Configuration

Best Practices Planning 7

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Dell DAE Manual de instalación Pagina 7