SCcsi Resercation Problems! Should i change Managed Paths to Round Robin?

[shatztal]

i have lots of issues of SCSI Reservation problems. I am Running VC 2.5 Update 5 and ESx 3.5 Update 4

should i change all VMFS on all ESXs to work RoundRobin? altough it is "Experimental" in 3.5

lots of people talked about this as a good soloution cause in vSphere it is Builed in i think.

need helpppp!??!?!?!?!

[TheEsp]

Hi

Yes should change your pathing alogrithm to "round-robin" but if your getting SCSI Reservation errors , you should be checking your SAN and see how busy the RAID group is running.

it could be that your guest are pushing to much I/O for that RAID group/data-store that you have them on.

What Storage Array do you have ?

What is the RAID group config ?

What type of guest do you have living on that datastore.

Is that RAID group being shared with any other hosts , or is it just for Vmware.

David

[shatztal]

i have a HITACHE USP VM

we saw that there are 4 Channels on the Storage that are to busy. so i don'es know if i should or not to change cause i now it is half supported but it is still i think better than Fixed

[TheEsp]

Hi

If you have a USP-V you'll have Tuning Manager , fire that up and see if there are any alarm status on "RAID Groups" that will be a good bet , to your SCSI reservations issues.

David

[mcowger]

your USP V will handle RR well, and its a good choice, but wont solve your SCSI reservations, which usually indicates too many VMs on a LUN or poor array performance.

--Matt

VCP, vExpert, Unix Geek