| To: | Dennis Kaarsemaker <dennis.kaarsemaker@xxxxxxxxxxx> |
|---|---|
| Subject: | Re: XFS IO multiplication problem on centos/rhel 6 using hp p420i raid controllers |
| From: | Stan Hoeppner <stan@xxxxxxxxxxxxxxxxx> |
| Date: | Thu, 07 Mar 2013 07:44:51 -0600 |
| Cc: | xfs@xxxxxxxxxxx |
| Delivered-to: | xfs@xxxxxxxxxxx |
| In-reply-to: | <1362663188.16657.20.camel@seahawk> |
| References: | <1362060736.1247.30.camel@seahawk> <20130228194023.GQ5551@dastard> <1362577992.1247.84.camel@seahawk> <20130307035737.GC6369@dastard> <1362651128.16657.13.camel@seahawk> <513891D7.4060801@xxxxxxxxxxxxxxxxx> <1362663188.16657.20.camel@seahawk> |
| Reply-to: | stan@xxxxxxxxxxxxxxxxx |
| User-agent: | Mozilla/5.0 (Windows NT 5.1; rv:17.0) Gecko/20130215 Thunderbird/17.0.3 |
On 3/7/2013 7:33 AM, Dennis Kaarsemaker wrote: > The "ten times as many bytes" is constant, so it is constantly writing > ten times as much data. Where in the IO stack are you counting the bytes? Are 10x as many bytes actually hitting the AGs? I.e. are you consuming 10x more (real--not counting preallocation) space in the filesystem? Or are you simply seeing larger IOs in flight per unit time, but the same total amount of IO bytes? -- Stan |
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