Hardware Installation
PixelStor 5000 User Manual
Rev. 1, May 2013
6-89
disk group is maintained, however user intervention is required to recover the data on the drives.
This ensures that the data on the remaining drives is not overwritten. If the drives are
designated as orphans, the user has the following options:
Complete the Set
– You can track down the remaining drives from the disk group, insert them
in any order into the same PixelStor 5000 /300e/100e enclosure and use the PixelStor Storage
Manager to do a discovery. Once the whole set is discovered, the disk group will be restored.
Rebuild a Disk Group
– If the original group is part of a RAID 1, 5, 6, or 10 disk group, a bad
drive maybe the reason for an orphan classification by the system. If this is the case, make sure
you have a global spare in the system and then use the PixelStor Storage Manager to do forced
discovery of the disk group. Once the disk group is discovered and the bad drive is identified,
the system will start the RAID rebuild using the global spare. This will restore the disk group.
Re-configure the Drives
– If you cannot complete the disk group or rebuild it, then you will not
be able to recreate the disk group (RASILIENT recommends you always back up your data to
recover from such a scenario). Alternatively you may just want to reuse drives from an old disk
group where the data on the drives is no longer needed. In either case you can create a new
disk group or turn the drives into global spares by using the PixelStor Storage Manager.
6
Appendix A – RAID Concepts & Cache Configurations
6.1
RAID Levels Defined
RAID 0 -
Data Stripping without Protection - This technique has striping but no
redundancy of data. The data is broken down into blocks and each block is written to a
separate disk.
Pros - I/O performance is improved by spreading the I/O across many channels/drives.
Cons-
Not “true" RAID because it is NOT fault-tolerant. The failure of just one drive will
result in all data in an array being lost.
Ideal applications - those that require high bandwidth without need for data protection.
RAID 1 -
Disk Mirroring - Consists of at least two drives that duplicate the storage of data.
There is no striping.
Pros- Read performance is improved since either disk can be read at the same time.
Write performance is the same as for single disk storage. It provides the best
Содержание PixelStor 5000
Страница 10: ...About This Manual Conventions Safety Symbols Safety Precautions Regulatory and Integration Information ...
Страница 34: ...Packing Checklist Rules for Adding Storage Chapter 2 Before You Begin ...
Страница 62: ...Hardware Installation PixelStor 5000 User Manual Rev 1 May 2013 4 25 Figure 4 7 Navigation Tree ...
Страница 90: ...Hardware Installation PixelStor 5000 User Manual Rev 1 May 2013 4 53 Figure 4 38 Options top of page ...
Страница 91: ...Hardware Installation PixelStor 5000 User Manual Rev 1 May 2013 4 54 Figure 4 39 Options tab top of page ...