...@yourcmc.ru]
Sent: Tuesday, January 21, 2020 3:43 PM
To: Eric K. Miller
Cc: ceph-users@lists.ceph.com
Subject: RE: [ceph-users] low io with enterprise SSDs ceph luminous - can we
expect more? [klartext]
Hi! Thanks.
The parameter gets reset when you reconnect the SSD so in fact it requires
We were able to isolate an individual Micron 5200 and perform Vitaliy's
tests in his spreadsheet.
An interesting item - write cache changes do NOT require a power cycle
to take effect, at least on a Micron 5200.
The complete results from fio are included at the end of this message
for the
Hi Vitaliy,
> You say you don't have access to raw drives. What does it mean? Do you
> run Ceph OSDs inside VMs? In that case you should probably disable
> Micron caches on the hosts, not just in VMs.
Sorry, I should have been more clear. This cluster is in production, so I
needed to schedule
Hi Vitaliy,
Similar to Stefan, we have a bunch of Micron 5200's (3.84TB ECO SATA version)
in a Ceph cluster (Nautilus) and performance seems less than optimal. I have
followed all instructions on your site (thank you for your wonderful article
btw!!), but I haven't seen much change.
