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List:       ceph-users
Subject:    [ceph-users] Do not use VMware Storage I/O Control with Ceph iSCSI GWs!
From:       Frédéric Nass <frederic.nass () univ-lorraine ! fr>
Date:       2022-01-26 20:05:02
Message-ID: c2cd352c-fb93-6515-3113-4088e3d0f5fe () univ-lorraine ! fr
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Hi,

For anyone using VMware ESXi (6.7) with Ceph iSCSI GWs (Nautilus), I 
thought you might benefit from our experience: I have finally identified 
what was causing a permanent ~500 MB/s and ~4k iops load on our cluster, 
specifically on one of our RBD image used as a VMware Datastore and it 
was Storage I/O control. Not sure whether this is a bug that could be 
taken care of on the ceph side (as a misinterpretation of a SCSI 
instruction that the ESXi would replay madly) but disabling Storage I/O 
Control definitely solved the problem. By disabling I mean choosing 
"Disable Storage I/O Control **and** statistics collection" on each 
Datastore.

Regards,

Frédéric.

-- 
Cordialement,

Frédéric Nass
Direction du Numérique
Sous-direction Infrastructures et Services

Tél : 03.72.74.11.35
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