Re: Any experiences with datafiles on RAID 5 with cache

From: Connor McDonald <mcdonald.connor.cs_at_bhp.com.au>
Date: Wed, 13 Jan 1999 16:52:08 +0800
Message-ID: <369C5EB8.3368@bhp.com.au>

Jarmo Blomster wrote:
>
> Hi,
>
> 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?
>
> TIA,
> Jarmo

I can't answer your question exactly (we use RAID 0+1) but in our experiences, we normally got the best performance by allocating our cache (assuming something like NVRAM that won't go splat if the power goes down) to our redo logs...

HTH
--

---

Connor McDonald
BHP Information Technology
Perth, Western Australia
"The difference between me and a madman is that I am not mad"

• Salvador Dali

Received on Wed Jan 13 1999 - 02:52:08 CST