VSAN-Troubleshooting-Reference-Manual

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Diagnostics and Troubleshooting Reference Manual – Virtual SAN MegaCli -Cfgdsply : Dell H710 Magnetic Disk Adapter 0 -- Virtual Drive Information: Virtual Drive: 1 (Target Id: 1) Name : RAID Level : Primary-0, Secondary-0, RAID Level Qualifier-0 Size : 931.0 GB Sector Size : 512 Parity Size : 0 State : Optimal Strip Size : 64 KB Number Of Drives : 1 Span Depth : 1 Default Cache Policy: WriteThrough, ReadAhead, Direct, No Write Cache if Bad BBU Current Cache Policy: WriteThrough, ReadAhead, Direct, No Write Cache if Bad BBU Default Access Policy: Read/Write Current Access Policy: Read/Write Disk Cache Policy : Disk's Default Encryption Type : None Default Power Savings Policy: Controller Defined Current Power Savings Policy: None Can spin up in 1 minute: Yes LD has drives that support T10 power conditions: Yes LD's IO profile supports MAX power savings with cached writes: No Bad Blocks Exist: No Is VD Cached: Yes Cache Cade Type : Read Only MegaCli -Cfgdsply : Dell H710 : SSD Adapter 0 -- Virtual Drive Information: Virtual Drive: 6 (Target Id: 6) Name : RAID Level : Primary-0, Secondary-0, RAID Level Qualifier-0 Size : 185.75 GB Sector Size : 512 Parity Size : 0 State : Optimal Strip Size : 256 KB Number Of Drives : 1 Span Depth : 1 Default Cache Policy: WriteThrough, ReadAhead, Direct, No Write Cache if Bad BBU Current Cache Policy: WriteThrough, ReadAhead, Direct, No Write Cache if Bad BBU Default Access Policy: Read/Write Current Access Policy: Read/Write Disk Cache Policy : Disk's Default Encryption Type : None Default Power Savings Policy: Controller Defined Current Power Savings Policy: None Can spin up in 1 minute: No LD has drives that support T10 power conditions: No LD's IO profile supports MAX power savings with cached writes: No Bad Blocks Exist: No Is VD Cached: No V M W A R E S T O R A G E B U D O C U M E N T A T I O N / 2 9 2
Diagnostics and Troubleshooting Reference Manual – Virtual SAN Appendix D - Advanced Settings There are only two advanced settings that can be considered tunable at this point in time. Caution: While VMware recommends against changing any of these advanced settings, you need to ensure that all hosts in the cluster have the same settings if you modify any of the advanced settings for Virtual SAN. VSAN.ClomRepairDelay The vsan.clomrepairdelay setting specifies the amount of time Virtual SAN waits before rebuilding a disk object. By default, the repair delay value is set to 60 minutes; this means that in the event of a failure that renders components ABSENT, Virtual SAN waits 60 minutes before rebuilding any disk objects. This is because Virtual SAN is not certain if the failure is transient or permanent. Changing this setting requires a clomd restart. Note: If a failure in a physical hardware component is detected, such as an Solid State Disk (SSD) or Magnetic Disk (MD), this results in components being marked as DEGRADED and Virtual SAN immediately responds by rebuilding the impacted components. KB article 2075456 has instructions on how to change this setting. VSAN.ClomMaxComponentsSizeGB By default VSAN.ClomMaxComponentSizeGB is set to 255GB. When Virtual SAN stores virtual machine objects, it creates components whose default size does not exceed 255 GB. If you use physical disks that are smaller than 255GB, then you might see errors similar to the following when you try to deploy a virtual machine: There is no more space for virtual disk XX. You might be able to continue this session by freeing disk space on the relevant volume and clicking retry. In situations like this, you may need to modify VSAN.ClomMaxComponentSizeGB to s size that is approximately 80% of the physical disk size. KB article 2080503 has instructions on how to change this setting. V M W A R E S T O R A G E B U D O C U M E N T A T I O N / 2 9 3
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