fr...@phoenix.owl.de (Frank Wille) writes:
>On Fri, 20 Jul 2018
>mlel...@serpens.de wrote:
>> Write operations on these servers have always been slow if the RAID
>> controller doesn't have a working battery backup unit (BBU).
>Good to know! Thanks.
>Which means, as soon as I install such a BBU, the write-operations would
>magically and immediately become fast?
>If only such a BBU wouldn't be so hard to find... :|
BBU modules should be available from places that sell refurbished
servers. The battery itself usually needs to be replaced every 1-2 years :-/
>Is there no hack to simulate the presence of a BBU?
Maybe you can enable write caching of the disk drives, that would
improve speed at the cost of somewhat reduced reliability.
If you use WAPBL setting vfs.wapbl.flush_disk_cache=0 may help
with the same caveat.
RAID-1 should also be significantly faster than RAID-5 in this case.
--
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Michael van Elst
Internet: mlel...@serpens.de
"A potential Snark may lurk in every tree."
