Josh Berkus writes:
> Yes, but it will have less of an impact on the system while it's running.

We'll find out.   I lowered it to vacuum_mem to 32000.

> What sort of disk array do you have?   That seems like a lot of time 
> considering how little work VACUUM is doing.

Vendor: DELL     Model: PERCRAID Mirror  Rev: V1.0
  Type:   Direct-Access                    ANSI SCSI revision: 02

Two 10K disks attached.


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