Re: BBU still needed with SSD?

От: Florian Weimer
Тема: Re: BBU still needed with SSD?
Дата: ,
Msg-id: 82vcuyd7p5.fsf@mid.bfk.de
(см: обсуждение, исходный текст)
Ответ на: Re: BBU still needed with SSD?  (Yeb Havinga)
Ответы: Re: BBU still needed with SSD?  (Yeb Havinga)
Список: pgsql-performance

Скрыть дерево обсуждения

BBU still needed with SSD?  (Andy, )
 Re: BBU still needed with SSD?  (Craig Ringer, )
  Re: BBU still needed with SSD?  (David Rees, )
   Re: BBU still needed with SSD?  (Andy, )
    Re: BBU still needed with SSD?  (Bruce Momjian, )
     Re: BBU still needed with SSD?  (Andy, )
      Re: BBU still needed with SSD?  (Greg Smith, )
 Re: BBU still needed with SSD?  (Yeb Havinga, )
  Re: BBU still needed with SSD?  (Florian Weimer, )
   Re: BBU still needed with SSD?  (Yeb Havinga, )
    Re: BBU still needed with SSD?  (Florian Weimer, )
     Re: BBU still needed with SSD?  (Yeb Havinga, )
      Re: BBU still needed with SSD?  (Florian Weimer, )
       Re: BBU still needed with SSD?  (Yeb Havinga, )
        Re: BBU still needed with SSD?  (Greg Smith, )
         Re: BBU still needed with SSD?  (Klaus Ita, )
 Re: BBU still needed with SSD?  (Greg Smith, )

* Yeb Havinga:

> The biggest drawback of 2 SSD's with supercap in hardware raid 1, is
> that if they are both new and of the same model/firmware, they'd
> probably reach the end of their write cycles at the same time, thereby
> failing simultaneously.

I thought so too, but I've got two Intel 320s (I suppose, the report
device model is "SSDSA2CT040G3") in a RAID 1 configuration, and after
about a month of testing, one is down to 89 on the media wearout
indicator, and the other is still at 96.  Both devices are
deteriorating, but one at a significantly faster rate.

--
Florian Weimer                <>
BFK edv-consulting GmbH       http://www.bfk.de/
Kriegsstraße 100              tel: +49-721-96201-1
D-76133 Karlsruhe             fax: +49-721-96201-99


В списке pgsql-performance по дате сообщения:

От: Yeb Havinga
Дата:
Сообщение: Re: BBU still needed with SSD?
От: Greg Smith
Дата:
Сообщение: Re: BBU still needed with SSD?