Mailinglist Archive: opensuse (1470 mails)

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Re: [opensuse] Why Is Leap 42.1 Benchmarking Poorly?
On Thu, Feb 25, 2016 at 2:28 PM, Vojtěch Zeisek
<vojtech.zeisek@xxxxxxxxxxxx> wrote:

Copy-on-write is terribly slowing down any DB.

btrfs does not do any copy on write. It does "redirect on write" which
is quite different. This does cause fragmentation; it is impossible to
give blanket statement what effect it will have. It will likely impact
sequential IO; it is much less likely impact random IO (unless your
database is very small and would not be affected by seek latency
otherwise).

Also snapshots don't make sense
for DB (use DB's tools).

If you have suggestions how to make point in time online copies
without impacting normal activity (terribly slowing down client access
:) ) *and* revert to them in seconds for multiterabyte database (in
order of several dozens TB) without using snapshots I am all ears.
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