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Re: Speed ups for a disk IO bound machine

From Piergiorgio Sartor <piergiorgio.sartor.this.should.not.be.used@nexgo.REMOVETHIS.de>
Newsgroups comp.os.linux.hardware
Subject Re: Speed ups for a disk IO bound machine
Date 2016-12-10 12:43 +0100
Organization A noiseless patient Spider
Message-ID <5b6thd-pt2.ln1@lazy.lzy> (permalink)
References <earhh4F8si0U1@mid.individual.net>

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On 2016-12-07 23:41, Peter Chant wrote:
[...]
> Any thoughts?

First of all, it would be good to know which kind
of I/O is occuring.
Is streaming read or write?
Is random read or write?

In general, I usually would suggest to use 2 SSD
in RAID-10 (Linux md).
This will double the streaming read performance and,
to certain extent, the random one.
The write performance will be the same as 1 SSD.

Same for the HDDs, but possibly with some SSD (over
RAID-10) caching.
This because writing might be a bit slower (actually
the FS RAM cache makes this not too observable).

In this case, the question is if it is better to use
bcache or lvmcache.
This depend on the load. The second is an "hotspot"
cache, meaning blocks frequently accessed are cached.
The first is a more generic cache.
Depending on use cases, one is better than the other.

Hope this helps,

bye,

-- 

piergiorgio

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Speed ups for a disk IO bound machine Peter Chant <pete@petezilla.co.uk> - 2016-12-07 22:41 +0000
  Re: Speed ups for a disk IO bound machine Roger Blake <rogblake@iname.invalid> - 2016-12-08 16:44 +0000
    Re: Speed ups for a disk IO bound machine Peter Chant <pete@petezilla.co.uk> - 2016-12-10 11:24 +0000
      Re: Speed ups for a disk IO bound machine Roger Blake <rogblake@iname.invalid> - 2016-12-11 01:34 +0000
        Re: Speed ups for a disk IO bound machine Peter Chant <pete@petezilla.co.uk> - 2016-12-11 22:07 +0000
  Re: Speed ups for a disk IO bound machine Piergiorgio Sartor <piergiorgio.sartor.this.should.not.be.used@nexgo.REMOVETHIS.de> - 2016-12-10 12:43 +0100
    Re: Speed ups for a disk IO bound machine Peter Chant <pete@petezilla.co.uk> - 2016-12-10 20:44 +0000
      Re: Speed ups for a disk IO bound machine Piergiorgio Sartor <piergiorgio.sartor.this.should.not.be.used@nexgo.REMOVETHIS.de> - 2016-12-10 23:05 +0100
        Re: Speed ups for a disk IO bound machine Peter Chant <pete@petezilla.co.uk> - 2016-12-11 11:54 +0000
          Re: Speed ups for a disk IO bound machine Piergiorgio Sartor <piergiorgio.sartor.this.should.not.be.used@nexgo.REMOVETHIS.de> - 2016-12-11 14:10 +0100
            Re: Speed ups for a disk IO bound machine Peter Chant <pete@petezilla.co.uk> - 2016-12-11 22:46 +0000
              Re: Speed ups for a disk IO bound machine Piergiorgio Sartor <piergiorgio.sartor.this.should.not.be.used@nexgo.REMOVETHIS.de> - 2016-12-12 19:22 +0100
            Re: Speed ups for a disk IO bound machine David Brown <david.brown@hesbynett.no> - 2016-12-13 10:17 +0100
              Re: Speed ups for a disk IO bound machine Peter Chant <pete@petezilla.co.uk> - 2016-12-14 20:03 +0000
                Re: Speed ups for a disk IO bound machine David Brown <david.brown@hesbynett.no> - 2016-12-15 12:55 +0100
                Re: Speed ups for a disk IO bound machine Peter Chant <pete@petezilla.co.uk> - 2016-12-15 23:18 +0000
                Re: Speed ups for a disk IO bound machine David Brown <david.brown@hesbynett.no> - 2016-12-16 09:34 +0100
        Re: Speed ups for a disk IO bound machine David Brown <david.brown@hesbynett.no> - 2016-12-13 09:57 +0100
  Re: Speed ups for a disk IO bound machine David Brown <david.brown@hesbynett.no> - 2016-12-12 09:11 +0100
    Re: Speed ups for a disk IO bound machine Peter Chant <pete@petezilla.co.uk> - 2016-12-12 23:08 +0000
      Re: Speed ups for a disk IO bound machine David Brown <david.brown@hesbynett.no> - 2016-12-13 09:29 +0100
        Re: Speed ups for a disk IO bound machine Peter Chant <pete@petezilla.co.uk> - 2016-12-14 23:16 +0000
          Re: Speed ups for a disk IO bound machine David Brown <david.brown@hesbynett.no> - 2016-12-15 13:15 +0100
            Re: Speed ups for a disk IO bound machine Peter Chant <pete@petezilla.co.uk> - 2016-12-15 22:50 +0000
              Re: Speed ups for a disk IO bound machine David Brown <david.brown@hesbynett.no> - 2016-12-16 09:39 +0100

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