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ESXi 5.0 and iSCSI

H

Hammer!

Limp Gawd
Joined
Nov 25, 2011
Messages
161
Hi, is there a way to make ESXi rescan available iSCSI targets before in boots up certain VM's? I have a "first" VM running Windows Server 2008R2 with MS iSCSI target 3.3. This VM serves the other VM's drives via iSCSI. The problem I have is that even though I have set auto power on on the other VM to wait 5 minutes before starting (eg, to ensure that first VM is up and running and serving the iSCSI disks), ESXi does not automatically rescan and those other VM's cannot boot as a result.

Thanks - any help would be much appreciated!

Hammer.
 
I had the same issue, and gave up on iSCSI as a result. I switched to NFS and it's been much more robust.
 
Sure, with some scripting, but the reality is that this is why nested sucks ;)
 
My experience was roughly the same. The only gotcha you might have is that ESXi mounts nfs as sync mode, with no way to change that, so your write performance might not be as good (in my case, my nfs server is a zfs SAN/NAS, and I can set async mode on the appliance...)
 
Unless you have battery backed cache, async mode is asking for corruption. Or you really, REALLY, trust ZFS to handle it (in my experience, for a total failure, i wouldn't - especially if you're running anything serious on it). Missing blocks are really fun to fix.
 
lopo, remember this is an all in one - in my experience it is far more likely the HW will lose power or fail some other way than have the OI VM panic. being an all in one, if you get a power failure, everything or nothing will fail, in which case it doesn't matter. also, are you saying you've actually had corriuption with zfs his way - that should never happen due to the COW nature of the FS - missing data that didn't get written, sure.
 
We have seen it actually, a few times, including one of our own running an AIO at home. It's rare, but it does happen.
 
Hi, thanks everyone for their help. I ended up buying a couple more SSD's for OS storage and converted my iSCSI storage disks to NFS and that seems to work better. Hammer.
 
lopoetve said:
We have seen it actually, a few times, including one of our own running an AIO at home. It's rare, but it does happen.
Click to expand...

but one has to make tradeoffs. the horrid performance from not disabling sync in that situation is not acceptable for me. i haven't yet decided to splurge for an SSD for a zil.
 
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