ADSM-L

Re: [ADSM-L] storage pool migration performance penalty

2010-01-16 07:53:39
Subject: Re: [ADSM-L] storage pool migration performance penalty
From: Richard Sims <rbs AT BU DOT EDU>
To: ADSM-L AT VM.MARIST DOT EDU
Date: Sat, 16 Jan 2010 07:51:56 -0500
On Jan 16, 2010, at 4:09 AM, Mehdi Salehi wrote:

Hi,
What happens if the migration threshold of a storage pool is reached
while
clients are sending their backups to TSM server? If this happens, the
storage pool should read and write simultaneously which impacts backup
performance.

What storage pool implementation are you thinking of?
The usual Disk type arrival pool has intrinsic overhead in block
management, plus logically contiguous blocks likely being rather
randomly distributed over the disk area, slowing access.  Caching
aggravates things.  A disk pool should always be sized to accommodate
normal daily loading, so migration can be avoided during the client
backups period.
If its tape type, you have no simultaneous read/write problems.  :-)

   Richard Sims

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