[Gluster-devel] Re; Load balancing ...

[Gareth Bult]

Urm,

Yes I can .. although I meant "filesystem information" generically rather than "ls".

My "real" test is using "find" .. which is unaffected by "unalias ls" ..

If your question is;
After "unalias ls" does the client still read filesystem information from BOTH servers"?

The answer is;
Yes .. according to tcpdump.

Gareth.

--
Managing Director, Encryptec Limited
Tel: 0845 5082719, Mob: 0785 3305393
Email: gareth at encryptec.net 
Statements made are at all times subject to Encryptec's Terms and Conditions of Business, which are available upon request.

----- Original Message -----
From: "Krishna Srinivas" <krishna at zresearch.com>
To: "Gareth Bult" <gareth at encryptec.net>
Cc: "gluster-devel Glister Devel List" <gluster-devel at nongnu.org>
Sent: Wednesday, April 23, 2008 12:56:27 PM GMT +00:00 GMT Britain, Ireland, Portugal
Subject: Re: [Gluster-devel] Re; Load balancing ...

Gordon,

can you do "unalias ls" and see if ls is still slow?

Krishna

On Wed, Apr 23, 2008 at 3:14 PM, Gareth Bult <gareth at encryptec.net> wrote:
> Hi, I'm using fuse-2.7.2glfs9 and glusterfs-1.3.8pre5 ..
>
>  Using AFR and "option read-subvolume" I'm expecting to be able to tell a client which server to prefer to read data from. Although this seems to work for pure data, it does not appear to work for file-system information .. so "dd" on a large file is quick and "ls" is very slow.
>
>  Can anyone tell me if "read-subvolume" should affect filesystem data and whether there is a way of speeding up what I'm doing.
>  i.e. can I tell it which volume to prefer for filesystem information lookups?
>
>  (effectively this is a read-mostly server running over a slow link .. basicall reads are good, "ls"'s are impossibly slow)
>
>  tia
>
>  --- Server ---
>
>  volume brick-raw
>  type storage/posix
>  option directory /vols/home/export
>  end-volume
>
>  volume brick
>  type features/posix-locks
>  subvolumes brick-raw
>  option mandatory on
>  end-volume
>
>  volume server
>  type protocol/server
>  option transport-type tcp/server
>  option auth.ip.brick.allow <ip's>
>  subvolumes brick
>  end-volume
>
>  --- Client ---
>  volume brick1
>  type protocol/client
>  option transport-type tcp/client
>  option remote-host brick1
>  option remote-subvolume brick
>  end-volume
>
>  volume brick2
>  type protocol/client
>  option transport-type tcp/client
>  option remote-host brick2
>  option remote-subvolume brick
>  end-volume
>
>  volume afr
>  type cluster/afr
>  subvolumes brick1 brick2
>  option read-subvolume brick1
>  end-volume
>
>  volume writebehind
>  type performance/write-behind
>  option aggregate-size 131072
>  subvolumes afr
>  end-volume
>
>  volume readahead
>  type performance/read-ahead
>  option page-size 65536
>  option page-count 16
>  subvolumes writebehind
>  end-volume
>
>  --
>  Managing Director, Encryptec Limited
>  Tel: 0845 5082719, Mob: 0785 3305393
>  Email: gareth at encryptec.net
>  Statements made are at all times subject to Encryptec's Terms and Conditions of Business, which are available upon request.
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