Re: iSCSI Multipath (Load Balancing) vs RBD Exclusive Lock

["shadow_lin"<shadow_lin@xxxxxxx>]

Hi Christie,

Is it safe to use active/passive multipath with krbd with exclusive lock for lio/tgt/scst/tcmu?

Is it safe to use active/active multipath If use suse kernel with target_core_rbd?

Thanks.

 

2018-03-07

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shadowlin

 

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发件人：Mike Christie <mchristi@xxxxxxxxxx>

发送时间：2018-03-07 03:51

主题：Re: [ceph-users] iSCSI Multipath (Load Balancing) vs RBD Exclusive Lock

收件人："Lazuardi Nasution"<mrxlazuardin@xxxxxxxxx>,"Ceph Users"<ceph-users@xxxxxxxxxxxxxx>

抄送：

 

On 03/06/2018 01:17 PM, Lazuardi Nasution wrote: 

> Hi, 

>  

> I want to do load balanced multipathing (multiple iSCSI gateway/exporter 

> nodes) of iSCSI backed with RBD images. Should I disable exclusive lock 

> feature? What if I don't disable that feature? I'm using TGT (manual 

> way) since I get so many CPU stuck error messages when I was using LIO. 

>  

 

You are using LIO/TGT with krbd right? 

 

You cannot or shouldn't do active/active multipathing. If you have the 

lock enabled then it bounces between paths for each IO and will be slow. 

If you do not have it enabled then you can end up with stale IO 

overwriting current data. 

 

 

 

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