HP LH4r HP Netserver LXr Pro NetRAID Installation Guide - Page 44

Setting Up RAID 1 Arrays on an HP NetServer Cluster

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The state... Indicates the drive is... Onln Rdy or READY HOTSP FAILED REBUILDING Online, functioning normally, and part of a configured array. Functioning normally, but not part of a configured logical drive nor configured as a hot spare Configured as a hot spare, powered up and ready for use (not Cluster supported). Out of service because a fault occurred. Rebuilding and salvaging data recovered from a failed drive. Refer to the HP NetRAID User Guide in Information Assistant for more information about HP NetRAID Assistant. Setting Up RAID 1 Arrays on an HP NetServer Cluster The HP NetRAID adapter and proprietary HP NetRAID software can be used to organize the cluster's disk storage into RAID level 1disk arrays. Each level 1 RAID array is composed of two hard (hot swap) drives located in external shared storage cabinets. RAID level 1 (mirroring) provides storage redundancy with maximum performance. A RAID 1 array consists of two drives that contain exactly the same data. That is, all of the data on one drive is replicated (mirrored) on the other. Stripe 1 2 3 Raid Level 1 Data Distribution Drive 1 Block 1 Block 2 Block 3 Drive 2 Block 1 Block 2 Block 3 The preceding table shows how data is distributed for RAID 1. Since each drive contains a complete copy of all data, all data is still available after the failure of one drive. To rebuild the RAID array after a failure, the failed drive is replaced and the data simply copied from the good drive to the new drive. 33

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The state...
Indicates the drive is...
Onln
Online, functioning normally, and part of a configured array.
Rdy or READY
Functioning normally, but not part of a configured logical drive nor configured as
a hot spare
HOTSP
Configured as a hot spare, powered up and ready for use (not Cluster supported).
FAILED
Out of service because a fault occurred.
REBUILDING
Rebuilding and salvaging data recovered from a failed drive.
Refer to the
HP NetRAID User Guide
in Information Assistant for more information about HP NetRAID
Assistant.
Setting Up RAID 1 Arrays on an HP NetServer Cluster
The HP NetRAID adapter and proprietary HP NetRAID software can be used to organize the cluster’s disk
storage into RAID level 1disk arrays. Each level 1 RAID array is composed of two hard (hot swap) drives
located in external shared storage cabinets.
RAID level 1 (mirroring) provides storage redundancy with maximum performance. A RAID 1 array consists of
two drives that contain exactly the same data. That is, all of the data on one drive is replicated (mirrored) on the
other.
Raid Level 1 Data Distribution
Stripe
Drive 1
Drive 2
1
Block 1
Block 1
2
Block 2
Block 2
3
Block 3
Block 3
The preceding table shows how data is distributed for RAID 1. Since each drive contains a complete copy of all
data, all data is still available after the failure of one drive. To rebuild the RAID array after a failure, the failed
drive is replaced and the data simply copied from the good drive to the new drive.