Hello Anton,
we have some bad experience with consumer disks. They tend to fail quite early and sometimes have extrem poor performance in Ceph workloads.
If possible, spend some money on reliable Samsung PM/SM863a SSDs. However a customer of us uses the WD Blue 1TB SSDs and seems to be quite happy with.
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Managing director
Mobile: +49 174 9335695
E-Mail: martin.verges@xxxxxxxx
Chat: https://t.me/MartinVerges
croit GmbH, Freseniusstr. 31h, 81247 Munich
CEO: Martin Verges - VAT-ID: DE310638492
Com. register: Amtsgericht Munich HRB 231263
Web: https://croit.io
YouTube: https://goo.gl/PGE1Bx
Am Sa., 24. Nov. 2018 um 18:10 Uhr schrieb Anton Aleksandrov <anton@xxxxxxxxxxxxxx>:
Hello community,
We are building CEPH cluster on pretty old (but free) hardware. We will
have 12 nodes with 1 OSD per node and migrate data from single RAID5
setup, so our traffic is not very intense, we basically need more space
and possibility to expand it.
We plan to have data on dedicate disk in each node and my question is
about WAL/DB for Bluestore. How bad would it be to place it on
system-consumer-SSD? How big risk is it, that everything will get
"slower than using spinning HDD for the same purpose"? And how big risk
is it, that our nodes will die, because of SSD lifespan?
I am sorry, for such untechnical question.
Regards,
Anton.
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