
GigaRAID/FT Model 1000 Cache & Battery Backup Units
ANDATACO's Fast-Write Mirrored Cache provides low disk response times during write operations, especially to RAID 5 disk groups. Un-cached RAID 5 writes require four I/O operations (read old data, read old parity, write new data, and write new parity). The resulting response time for a single write operation averages about 60 ms. The maximum throughput is less than 300 writes/sec because of disk bottlenecks. By intercepting the write request and storing it in mirrored memory, ANDATACO enables writes to be performed in as little as 4.6 ms and a maximum throughput of over 700 writes/sec. Many different kinds of applications will benefit from cached writes, especially transaction-based systems, where fast-write response times are required under high load conditions.
GFT-Cache-8
GigaRAID 8.0MB Cache (Two
4.0MB Memory Cards).
___________________________________________________________________
GFT-Cache-16
GigaRAID 16MB Cache (Four
4.0MB Memory Cards).
___________________________________________________________________
GFT-MCache-8
GigaRAID 8.0MB Useable
Mirrored Cache (Four 4.0MB
Memory Cards - Two per SP).
___________________________________________________________________
GFT-MCache-16
GigaRAID 16MB Useable Mirrored
Cache (Eight 4.0MB Memory
Cards - Four per SP).
___________________________________________________________________
GFT1-BBU
Model 1300 Battery Unit - Used
when Upgrading Model 1100 to
Model 1300.
___________________________________________________________________
Copyright 1994, 1995 by ANDATACO. All rights reserved.