Re: Any experiences with datafiles on RAID 5 with cache

From: Jeff Hunter <jeffh_at_btitelecom.net>
Date: Wed, 13 Jan 1999 09:15:55 -0800
Message-ID: <77i9ph$hpm$1@defiant.btitelecom.net>

We use a Sun A3000 with 64M cache on two controllers. You must be carefull with what you put on the cached controllers because, as we all know, power can go away at any time. I have no problem putting data on a cached controller because we have redundant power supplies, redundant UPS, and the A3000 has an internal battery as well. However, your situation may be different...

The cache definitely speeds up write operations in our environment. We get at least 3x the throughput on writes with caching turned on.

Jarmo Blomster wrote in message <77hkme$mp0$1_at_news.kolumbus.fi>...
>Is there any experiences about placing data files (table space+index
space)
>on Digital Raid Array 310/3000 with HSZ22 controllers. The RAID level will
>be 5.
>
>To my knowledge there is 16 MB cache available, how much does the cache
>speed up write operations?
>
>How do I estimate the effect of cache in this environment?
Received on Wed Jan 13 1999 - 11:15:55 CST