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Markman12-
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ME4024 High Latency (ResponseTime) on RAID5 10K volumes

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We are experiencing high response times (latency) on our RAID5 volumes with SAS 10K drives, we use them to store SQL Data files.

Where can we start to diagnose?

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Moderator
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Re: ME4024 High Latency (ResponseTime) on RAID5 10K volumes

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Hello Markman12-,

I would check your configuration with our Deployment guide to confirm that all is set correctly.  https://topics-cdn.dell.com/pdf/powervault-me4012_deployment-guide_en-us.pdf

Here is also a guide for using SQL on a ME4023 s well. https://downloads.dell.com/manuals/common/powervault-me4-series-microsoft-sql-server-dell-emc-2018-3...

Please let us know if you have any other questions.

DELL-Sam L
Dell | Social Outreach Services - Enterprise
Download the Dell Quick Resource Locator app today to access PowerEdge support content on your mobile device! (iOS, Android, Windows)

Markman12-
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Re: ME4024 High Latency (ResponseTime) on RAID5 10K volumes

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Hello Sam.

We are using RAID5 pools with 4 1200GB 10K disks. In the ME4024 Admin Guide (p. 184) I saw that we should be using RAID5 Volumes with 5 or 9 Disks. Do you think this is cause of our latency problem?

We also have a 3 600GB 15K disks RAID5 pool with the same situation. Where else can we look in our configuration for a possible misconfiguration?

Thanks a lot.

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Re: ME4024 High Latency (ResponseTime) on RAID5 10K volumes

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Hello Markman12-,

Since you are only using 4 drives in your Raid 5 that can cause latency on your volume.  I would also make sure that you check the support matrix as it also has some configuration information that can help as well. Here is the link to the support matrix. https://topics-cdn.dell.com/pdf/powervault-me4012_support-matrix_en-us.pdf

Please let us know if you have any other questions.

DELL-Sam L
Dell | Social Outreach Services - Enterprise
Download the Dell Quick Resource Locator app today to access PowerEdge support content on your mobile device! (iOS, Android, Windows)

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Markman12-
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Re: ME4024 High Latency (ResponseTime) on RAID5 10K volumes

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Thank you Sam.

We are now planning to expand those RAID5 to 5 drives.

We are considering to switch the ME4024 from virtual to linear. Do you believe it could help us with our performance problems?

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Re: ME4024 High Latency (ResponseTime) on RAID5 10K volumes

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Hello Markman12-,

It can improve performance by switching to linear from virtual.  With Linear you have more control over your pools and volumes then you do in virtual.

Please let us know if you have any other questions.

DELL-Sam L
Dell | Social Outreach Services - Enterprise
Download the Dell Quick Resource Locator app today to access PowerEdge support content on your mobile device! (iOS, Android, Windows)

Markman12-
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Re: ME4024 High Latency (ResponseTime) on RAID5 10K volumes

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A last question, can we use the SSD Read Cache feature if we switch to Linear?

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Re: ME4024 High Latency (ResponseTime) on RAID5 10K volumes

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Hello Markman12-,

SSD Read Cache feature is not available in Linear.

Please let us know if you have any other questions.

DELL-Sam L
Dell | Social Outreach Services - Enterprise
Download the Dell Quick Resource Locator app today to access PowerEdge support content on your mobile device! (iOS, Android, Windows)

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