Yes, all disk are in single drive raid 0. Now cache is enabled for all drives, 
should I disable cache for SSD drives?

Regards,

Mateusz

 

From: Tyler Bishop [mailto:tyler.bis...@beyondhosting.net] 
Sent: Thursday, June 11, 2015 7:30 PM
To: Mateusz Skała
Cc: ceph-users@lists.ceph.com
Subject: Re: [ceph-users] Hardware cache settings recomendation

 

You want write cache to disk, no write cache for SSD.

 

I assume all of your data disk are single drive raid 0?

 

 


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Tyler Bishop
Chief Executive Officer
513-299-7108 x10


tyler.bis...@beyondhosting.net <mailto:tyler.bis...@beyondhosting.net> 


If you are not the intended recipient of this transmission you are notified 
that disclosing, copying, distributing or taking any action in reliance on the 
contents of this information is strictly prohibited.

 

 

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From: "Mateusz Skała" <mateusz.sk...@budikom.net 
<mailto:mateusz.sk...@budikom.net> >
To: ceph-users@lists.ceph.com <mailto:ceph-users@lists.ceph.com> 
Sent: Saturday, June 6, 2015 4:09:59 AM
Subject: [ceph-users] Hardware cache settings recomendation

 

Hi,

Please help me with hardware cache settings on controllers for ceph rbd best 
performance. All Ceph hosts have one SSD drive for journal.

 

We are using 4 different controllers, all with BBU: 

*         HP Smart Array P400

*         HP Smart Array P410i

*         Dell PERC 6/i

*         Dell  PERC H700

 

I have to set cache policy, on Dell settings are:

*         Read Policy 

o   Read-Ahead (current)

o   No-Read-Ahead

o   Adaptive Read-Ahead

*         Write Policy 

o   Write-Back (current)

o   Write-Through 

*         Cache Policy

o   Cache I/O

o   Direct I/O (current)

*         Disk Cache Policy

o   Default (current)

o   Enabled

o   Disabled

On HP controllers:

*         Cache Ratio (current: 25% Read / 75% Write)

*         Drive Write Cache

o   Enabled (current)

o   Disabled

 

And there is one more setting in LogicalDrive option:

*         Caching: 

o   Enabled (current)

o   Disabled

 

Please verify my settings and give me some recomendations. 

Best regards,

Mateusz


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