Re: Hardware vs Software RAID

От: Matthew Wakeling
Тема: Re: Hardware vs Software RAID
Дата: ,
Msg-id: Pine.LNX.4.64.0806271143281.4085@aragorn.flymine.org
(см: обсуждение, исходный текст)
Ответ на: Re: Hardware vs Software RAID  ("Merlin Moncure")
Ответы: Re: Hardware vs Software RAID  ("Merlin Moncure")
Список: pgsql-performance

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Hardware vs Software RAID  (Adrian Moisey, )
 Re: Hardware vs Software RAID  ("Merlin Moncure", )
  Re: Hardware vs Software RAID  (Matthew Wakeling, )
   Re: Hardware vs Software RAID  ("Peter T. Breuer", )
    Re: Hardware vs Software RAID  (Greg Smith, )
     Re: Hardware vs Software RAID  ("Jonah H. Harris", )
      Re: Hardware vs Software RAID  ("Joshua D. Drake", )
     Re: Hardware vs Software RAID  (Matthew Wakeling, )
      Re: Hardware vs Software RAID  (Vivek Khera, )
       Re: Hardware vs Software RAID  (Matthew Wakeling, )
        Re: Hardware vs Software RAID  ("Scott Marlowe", )
        Re: Hardware vs Software RAID  ("Merlin Moncure", )
         Re: Hardware vs Software RAID  (Matthew Wakeling, )
          Re: Hardware vs Software RAID  ("Merlin Moncure", )
     Re: Hardware vs Software RAID  ("Peter T. Breuer", )
      Re: Hardware vs Software RAID  (Greg Smith, )
     Re: Hardware vs Software RAID  (Robert Treat, )
   Re: Hardware vs Software RAID  ("Merlin Moncure", )
    Re: Hardware vs Software RAID  ("Peter T. Breuer", )
     Re: Hardware vs Software RAID  ("Merlin Moncure", )
      Re: Hardware vs Software Raid  ("Peter T. Breuer", )
       Re: Hardware vs Software Raid  ("Merlin Moncure", )
       Re: Hardware vs Software Raid  (, )
       Re: Hardware vs Software Raid  (Greg Smith, )
 Re: Hardware vs Software RAID  ("Scott Marlowe", )
  Re: Hardware vs Software RAID  ("Joshua D. Drake", )
   Re: Hardware vs Software RAID  ("Merlin Moncure", )
    Re: Hardware vs Software RAID  (Andrew Sullivan, )
     Re: Hardware vs Software RAID  ("Kevin Grittner", )
      Re: Hardware vs Software RAID  (Andrew Sullivan, )
     Re: Hardware vs Software RAID  (Greg Smith, )
    Re: Hardware vs Software RAID  (Greg Smith, )

On Thu, 26 Jun 2008, Merlin Moncure wrote:
> In addition there are many different types of flash (MLC/SLC) and the
> flash cells themselves can be organized in particular ways involving
> various trade-offs.

Yeah, I wouldn't go for MLC, given it has a tenth the lifespan of SLC.

> The main issue is lousy random write performance that basically makes
> them useless for any kind of OLTP operation.

For the mentioned device, they claim a sequential read speed of 100MB/s,
sequential write speed of 80MB/s, random read speed of 80MB/s and random
write speed of 30MB/s. This is *much* better than figures quoted for many
other devices, but of course unless they publish the block size they used
for the random speed tests, the figures are completely useless.

Matthew

--
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' <`locate dict/words`


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