Re: Hardware vs Software RAID
От | Matthew Wakeling |
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Тема | Re: Hardware vs Software RAID |
Дата | |
Msg-id | Pine.LNX.4.64.0806271143281.4085@aragorn.flymine.org обсуждение исходный текст |
Ответ на | Re: Hardware vs Software RAID ("Merlin Moncure" <mmoncure@gmail.com>) |
Ответы |
Re: Hardware vs Software RAID
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Список | pgsql-performance |
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 -- sed -e '/^[when][coders]/!d;/^...[discover].$/d;/^..[real].[code]$/!d ' <`locate dict/words`
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