[Gluster-users] To GlusterFS or not...

[Roman]

Hi,

just a question ...

Would SAS disks be better in situation with lots of seek times using
GlusterFS?

2014-09-22 23:03 GMT+03:00 Jeff Darcy <jdarcy at redhat.com>:

>
> > The biggest issue that we are having, is that we are talking about
> > -billions- of small (max 5MB) files. Seek times are killing us
> > completely from what we can make out. (OS, HW/RAID has been tweaked to
> > kingdom come and back).
>
> This is probably the key point.  It's unlikely that seek times are going
> to get better with GlusterFS, unless it's because the new servers have
> more memory and disks, but if that's the case then you might as well
> just deploy more memory and disks in your existing scheme.  On top of
> that, using any distributed file system is likely to mean more network
> round trips, to maintain consistency.  There would be a benefit from
> letting GlusterFS handle the distribution (and redistribution) of files
> automatically instead of having to do your own sharding, but that's not
> the same as a performance benefit.
>
> > I’m not yet too clued up on all the GlusterFS naming, but essentially
> > if we do go the GlusterFS route, we would like to use non replicated
> > storage bricks on all the front-end, as well as back-end servers in
> > order to maximize storage.
>
> That's fine, so long as you recognize that recovering from a failed
> server becomes more of a manual process, but it's probably a moot point
> in light of the seek-time issue mentioned above.  As much as I hate to
> discourage people from using GlusterFS, it's even worse to have them be
> disappointed, or for other users with other needs to be so as we spend
> time trying to fix the unfixable.
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-- 
Best regards,
Roman.
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