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Discussion: Microsoft Windows 2008 R2 CSV and Equallogic SAN
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martius |
Microsoft Windows 2008 R2 CSV and Equallogic SAN
Jun 15 2010, 4:06 AM EDT
| Post edited: Jun 17 2010, 3:15 PM EDT
Since Windows 2008 R2 it is possible to build an Hyper-V cluster with Cluster Shared Volumes (CSV). One way to build suge a cluster is to use Equallogic PS series.With atleast firmware 4.3.5 there is an issues when you create an Failover Cluster for use with Hyper-V with the following configuration: - More then one PS series Equallogic - More then 2 NIC’s per node - More than 4 nodes - More then the default MPIO HIT kit which is 2. All has too do with how Equallogic handles Peristent Reservations (PR). Per CSV there are only max. 32 PRs available. But how do they get this number? My assumption is the following formula: Number of Equallogics = E Number of NICs = N Number of MPIO = M (default HIT = 2) Number of Servers = S E * N * M * S = 32 So for instance if you have 2 Equallogics, 2 NIC’s per node which is the minimum, the default HIT kit settings of 2 and 4 nodes you will end up with the following: 2 * 2 * 2 * 4 = 32 Why did I use this example. This because with 5 nodes the failover cluster will fail whenever you want to do a storage migration or an reboot of one of the nodes. This is because you will have 40 PR’s! This all is with firmware version 4.3.5. Now, is Equallogic doing nothing to fix this because a Hyper-V cluster can contain a maximum of 16 nodes. With the formula from above you will get with the use of only 1 Equallogic atleast 64 PR’s (1 * 2 * 2 * 16). But why build a 16 nodes Hyper-V cluster with only 1 Equallogic PS series? You will probably use atleast 2 maybe 3 arrays. This is not the full question. More here >>> http://www.martius.nl/?p=1896! The question realy is if I'm right and if I'm right how can you possibly build a 16 node Hyper-V cluster with CSV and multiple NIC's and Equallogics? Do you find this valuable?
Keyword tags:
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Donald_Williams |
1. RE: Microsoft Windows 2008 R2 CSV and Equallogic SAN
Jun 15 2010, 10:00 AM EDT
Hello, You are correct that 4.x firmware has a limit of 32 PR's per volume.. That will be changed to 96 in the v5.0 firmware due out this summer. Regards, -don Do you find this valuable? |
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emptyone |
2. RE: Microsoft Windows 2008 R2 CSV and Equallogic SAN
Jun 17 2010, 1:31 PM EDT
We are running a 2008 R2 Hyper-V cluster with CSV's. If i understand this correct:We have 2 EQ, 4 NICS, default MPIO of 2 and 3 nodes. Which means 48 PR's? And this can give problems? Do you find this valuable? |
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Donald_Williams |
3. RE: Microsoft Windows 2008 R2 CSV and Equallogic SAN
Jun 17 2010, 2:05 PM EDT
Yes. What version of Firmware are you using? Please open a case with EQL support so they can review the diags. Regards, -don Do you find this valuable? |
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martius |
4. RE: Microsoft Windows 2008 R2 CSV and Equallogic SAN
Jun 17 2010, 3:38 PM EDT
"That will be changed to 96 in the v5.0 firmware due out this summer.Why only 96? How can you possibly build a 16 node Hyper-V R2 cluster with only 96 PR's allowed? Or is there a work around for this? Do you find this valuable? |
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Donald_Williams |
5. RE: Microsoft Windows 2008 R2 CSV and Equallogic SAN
Jun 17 2010, 5:30 PM EDT
Hello, 16 Nodes times 6 iSCSI connections each would be 96 PRs. By default, we only spread volumes across three members in one pool. So if you have six arrays in a pool, we will use different combination of three members to handle different volumes. Six iSCSI connections per host is allot of bandwidth. Regards, -don Do you find this valuable? |
