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Re: postgresql random io test with 2 SSD Kingston V+100 500GB in (software) Raid1

From: "Nicholson, Brad (Toronto, ON, CA)" <bnicholson(at)hp(dot)com>
To: Laurent Laborde <kerdezixe(at)gmail(dot)com>, "pgsql-performance(at)postgresql(dot)org"<pgsql-performance(at)postgresql(dot)org>
Subject: Re: postgresql random io test with 2 SSD Kingston V+100 500GB in (software) Raid1
Date: 2011-04-19 13:21:04
Message-ID: 2626AEE4839D064CB0472A3814DC403F46D407DD24@GVW1092EXB.americas.hpqcorp.net (view raw or flat)
Thread:
Lists: pgsql-performance
> -----Original Message-----
> From: pgsql-performance-owner(at)postgresql(dot)org [mailto:pgsql-performance-
> owner(at)postgresql(dot)org] On Behalf Of Laurent Laborde
> Sent: Tuesday, April 19, 2011 8:37 AM
> To: pgsql-performance(at)postgresql(dot)org
> Subject: Re: [PERFORM] postgresql random io test with 2 SSD Kingston
> V+100 500GB in (software) Raid1
> 
> If we use them (unlikely), recovery in case of power outage isn't a
> problem, as we will use it on slave database (using Slony-I) that can
> be created/destroyed at will.
> And, anyway, our slave have fsync=off so the battery won't change
> anything in case of power outage :)

Are these on the same UPS?  If so, you have a failure case that could cause you to lose everything.

Brad.


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