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To: Thomas Mercer-Hursh who wrote (31566)	9/16/2000 4:14:13 PM
From: DownSouth	Read Replies (3) \| Respond to of 54805

Thomas, wrt NTAP RAID 4 and NVRAM--the reliability of the write cache is high enough that ORCL, Sybase, Informix all support NTAP NFS mounts for their databases. NO OTHER FORM OF NFS MOUNT is supported by ANY of these companies. They supported NTAP after extensive in-house testing, technical meetings, and even peeks at the ONTAP source code. NTAP does such things as dual batteries on the NVRAM and detection of an NVRAM failure on restart after a catastrophic failure, then signaling the failure to the RDBMS engine (stale handles) so that the RDBMS engine can recover. NVRAM is an integral part of the clustered failover configuration, with NUMA connects between the two partner CPUs, each updating the other's NVRAM with its own write cache contents so that the partner can fully recover in case of a failure by the other, then a passback of NVRAM contents when the failed partner is back online. The new multi-system clusters coming with VI will probably use NUMA and NVRAM synchronizations as well.