[Linuxtrent] Re: consiglio HW per desktop/workstation: SATA+SSD?
- From: azazel <azazel@xxxxxxxxxxxxxxx>
- To: linuxtrent@xxxxxxxxxxxxx
- Date: Fri, 07 Oct 2016 14:40:16 +0200
"azazel" == azazel <azazel@xxxxxxxxxxxxxxx> writes:
"Emanuele" == Emanuele Olivetti <emanuele@xxxxxxxxxxxxxx> writes:
azazel>
https://blog.a2o.si/2014/09/07/linux-software-raid-why-you-should-always-use-raid-10-instead-of-raid-1/
azazel> un po' datato ma ancora valido)
azazel> Da approfondire comunque come sia il layout del sottostante raid1 in
azazel> modo da conservare la sicurezza dei dati.
dal thread linkato in quel post:
linux-raid-ml> You are absolutely correct about the single-threaded read
performance of
linux-raid-ml> raid1 pairs - for a number of reasons, a single thread read
will get
linux-raid-ml> reads from only one disk. This is not a problem in many
cases, because
linux-raid-ml> you often have multiple simultaneous reads on "typical"
systems with
linux-raid-ml> raid1. But for some cases, such as a high performance
desktop, it can
linux-raid-ml> be a limitation.
[...]
linux-raid-ml> md raid and mdadmin already support a very flexible form of
raid10.
linux-raid-ml> Unlike traditional raid10 that requires a multiple of 4
disks, Linux
linux-raid-ml> raid10 can work with /any/ number of disks greater than 1.
There are
linux-raid-ml> various layouts that can be used for this - the Wikipedia
entry gives
linux-raid-ml> some useful diagrams:
linux-raid-ml>
<
http://en.wikipedia.org/wiki/Non-standard_RAID_levels#Linux_MD_RAID_10>
linux-raid-ml> You can also read about it in the mdadm manual page, and
various
linux-raid-ml> documents and resources around the web.
linux-raid-ml> In your particular case, what you want is to use "--layout
raid10,f2" on
linux-raid-ml> your two disks. This asks md to split each disk (or the
partitions you
linux-raid-ml> use) into two parts, without creating any new partitions.
The first
linux-raid-ml> half of disk 1 is mirrored with the second half of disk 2,
and vice
linux-raid-ml> versa, then these mirrors are striped.
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