186 ©
Copyright 2017 QSAN Technology, Inc. All Right Reserved.
10.2.3.
RAID Level of SSD Cache Pool
SSD read cache with NRAID+
Generally, SSD read cache uses NRAID (Non-RAID) or RAID 0 without data protection to
create the SSD cache storage space. Our SSD read cache technology uses NRAID+ which is
parallel NRAID without stripe.
Figure 10-4
SSD Read Cache with NRAID+
NRAID is a method of combining the free space on multiple disk drives to create a spanned
capacity. A NRAID is generally a spanned volume only, as it often contains mismatched
types and sizes of disk drives. RAID 0 consists of striping, without mirroring or parity.
Adding a disk drive into RAID 0 needs to re-stripe the data. For SSD cache, it will have
terrible performance when performing SSD cache and migrating RAID 0 at the same time.
Let alone remove a disk drive.
Compare to the NRAID or RAID 0, NRAID+ places the independent block distributed on the
different SSDs. This NRAID+ technology combines with the advantages of NRAID and has
better random I/O than NRAID. It also has the advantage of easy to add/remove SSDs from
the SSD cache pool to increase/decrease the capacity.
Although the SSD read cache is a technique of duplicating data. If the SSD cache pool
corrupts, the original data will be safe but stop SSD read cache.
SSD read-write cache with NRAID 1+
Summary of Contents for XCubeSAN XS5224D
Page 71: ...SANOS User Interface 49 nnnnn RPM Power Supply Local PSU n status Reset to Default Yes No...
Page 99: ...System Settings 77 Figure 6 14 System Information...
Page 315: ...Monitoring 293 Figure 13 5 Hardware Monitoring...
Page 327: ...Support and Other Resources 305 Figure 15 1 Download Service Package in the SANOS UI...
Page 331: ...Support and Other Resources 309...