On Friday 22 February 2013 15:08:34 Skip Robinson wrote:
> Someone once observed that 'rarely used' is not the same the thing as
> 'lightly used'. Whenever a file is accessed for read or write, IOS goes
> after it with a heavy boot. Then there's the problem of backups: if a file
> is worth keeping around, you probably want to back it up periodically,
> maybe even frequently. Files like JES checkpoint and couple data sets do
> not appreciate being made to stand in line even for seconds.
>
> The biggest advantage of large volumes is reduction in UCB count. One
> disadvantage is that larger volumes take longer to back up and to restore.
> We have some astonishingly large 'volumes' in the open systems world that
> are supported by only modestly fast backup/restore processes. Keeping an
> important application down for a lengthy restore is a hard bullet to bite.
>
>
> .
> .
> JO.Skip Robinson
If I remember correctly, there is also an issue of the number of paths
available; fewer, larger volumes = fewer paths = more I/O contention. (This
may be an old issue that is no longer relevant.)
Leslie
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