VMware VCENTER CONFIGURATION MANAGER FOUNDATION CHECKER 3.0 Manual do Utilizador descarregar pdf (Página 21)

RAID

protection

level

Description

RAID 5

•

Block-level striping with a single parity block, where the parity data is distributed across all of

the drives in the set.

•

Offers the best mix of performance, protection, and economy.

•

Has a higher write performance penalty than RAID 1/0 because multiple I/Os are required to

perform a single write.

•

With single parity, can sustain a single drive failure with no data loss. Vulnerable to data loss

or unrecoverable read errors on a track during a drive rebuild.

•

Highest economy of the three supported RAID levels. Usable capacity is 80% of raw

capacity.

RAID 6

•

Block-level striping with two parity blocks, distributed across all of the drives in the set.

•

Offers increased protection and read performance comparable to RAID 5.

•

Has a significant write performance penalty because multiple I/Os are required to perform a

single write.

•

Economy is very good. Usable capacity is 75% of raw capacity or better.

•

EMC best practice for SATA and NL-SAS drives.

There are RAID packs for each combination of RAID protection level and tier type. The RAID levels

dictate the number of drives that are included in the packs. The following table lists RAID protection levels

and the number of drives in the pack for each level: RAID 5 or RAID 1/0 is for performance and extreme

performance tiers and RAID 6 is for the capacity tier.

RAID protection level Number of drives per RAID pack

RAID 1/0 8 (4 data + 4 mirrors)

RAID 5 5 (4 data + 1 parity) or 9 (8 data + 1 parity)

RAID-6 8 (6 data + 2 parity) or 16 (14 data + 2 parity)

Disk array enclosures

If the number of RAID packs in a Vblock System is expanded, more disk array enclosures (DAEs) might

be required. DAEs are added individually. The base includes the DPE as the first DAE.

There are two types of DAEs: a 15 drive 3U enclosure for 3½ inch form factor drives and a 25 drive 2U

enclosure for 2½ inch form factor drives. To ensure that the loads are balanced, physical disks will be

spread across the DAEs in accordance with best practice guidelines.

Related information

Base configurations and scaling (see page 11)

Vblock

240 Architecture Overview Storage layer hardware

2014 VCE Company, LLC.

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 44 45

Comentários a estes Manuais

Sem comentários

VMware VCENTER CONFIGURATION MANAGER FOUNDATION CHECKER 3.0 Manual do Utilizador Página 21

Comentários a estes Manuais