| From: | "MauMau" <maumau307(at)gmail(dot)com> |
|---|---|
| To: | "Hannu Krosing" <hannu(at)2ndQuadrant(dot)com>, "Andres Freund" <andres(at)2ndquadrant(dot)com>, "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com> |
| Cc: | "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us>, "Kevin Grittner" <kgrittn(at)ymail(dot)com>, "Bruce Momjian" <bruce(at)momjian(dot)us>, "Heikki Linnakangas" <hlinnakangas(at)vmware(dot)com>, "Simon Riggs" <simon(at)2ndQuadrant(dot)com>, "Rajeev rastogi" <rajeev(dot)rastogi(at)huawei(dot)com>, <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Standalone synchronous master |
| Date: | 2014-01-09 15:15:34 |
| Message-ID: | CBA80AC741504640A9466018BB8EBC60@maumau |
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| Lists: | pgsql-hackers |
From: "Hannu Krosing" <hannu(at)2ndQuadrant(dot)com>
> On 01/09/2014 01:57 PM, MauMau wrote:
>> Let me ask a (probably) stupid question. How is the sync rep
>> different from RAID-1?
>>
>> When I first saw sync rep, I expected that it would provide the same
>> guarantees as RAID-1 in terms of durability (data is always mirrored
>> on two servers) and availability (if one server goes down, another
>> server continues full service).
> What you describe is most like A-sync rep.
>
> Sync rep makes sure that data is always replicated before confirming to
> writer.
Really? RAID-1 is a-sync?
Regards
MauMau
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