KernSafe Technology

This is an end user question. How well does iStorage and iStorage HA work with an Xenserver 6.1 enivronment. Saw the recent issue in the last post but in general, how well does it work?

What kind os environment are you guys running it on? (2003. 2008 R2)

Does iStorage run on Windows Server Web edition or does it require WIndows Standard server or higher?

Any issues with multipath on Xenserver?

Anyone tried this with XCP (Xenserver 6.1 open source edition)

Interested in any opinions on this product in a Citrix environment.

Thanks!

We tested with iStorage Server 2.87 and XenServer 6.10, they was working well.
iStorage Server can work on almost any Version of Windows after 2000.
Windows Server 2008 x64 is recommended version, we don't find difference on working with iStorage Server between its sub-versions.
We don't have existing issue in multipath, and will test with XCP later.

Would like to see some info on how big a disk can I create like 5tb or higher. Whats the largest disk size you have test this with?

There is a checkox 'Enable Windows System Cache' what excatly is it referring to? Can that be adjusted?

Will putting in a lot of ram make the system faster, or is there a point of diminshing returns?

Thanks!

Any recommendations on what to put inside the /etc/multipath.com file to help performance.

I currently only have:

defaults {
user_friendly_names no
path_grouping_policy multibus

}

It seems to be ok and my connections from a multipath -ll show up as:

201cdd6086b692df0 dm-1 KernSafe,iSCSI Adapter
[features=0][hwhandler=0][rw]
\_ round-robin 0 [prio=2][active]
\_ 7:0:0:0 sdc 8:32 [active][ready]
\_ 6:0:0:0 sdb 8:16 [active][ready]

I saw an entry in your HA example but not sure it applied if using a single server with MPIO.

Was wondering there was access to any ISCSI target parameters like

MaxRecvDataSegmentLength
MaxBurstLength
MaxXmitDataSegmentLength
FirstBurstLength
DataDigest
MaxOutstandingR2T
InitialR2T
ImmediateData
HeaderDiget
wthreads.

Some ISCSI vendors allow these to be tweaked to match the max parameters in the xenservers.

Thanks!

Would like to see some info on how big a disk can I create like 5tb or higher. Whats the largest disk size you have test this with?

There is a checkox 'Enable Windows System Cache' what excatly is it referring to? Can that be adjusted?

Will putting in a lot of ram make the system faster, or is there a point of diminshing returns?

The biggest image file we tested is 33TB, "Enable Windowss System Cache" is enable windows file system cache, this is not recommend for larger image files (more than 1TB), it can't be adjusted, if you want to put more memory, you can enable iStorage Server own cache, you will see Cache page in the Target Properties dialog.

MaxRecvDataSegmentLength
MaxBurstLength
MaxXmitDataSegmentLength
FirstBurstLength
DataDigest
MaxOutstandingR2T
InitialR2T
ImmediateData
HeaderDiget
wthreads.

Its not allowd to be modified in our product at this time, we will open these parameters in future releases.

Would be great if you were able to allow an SSD drive to be used for cache instead of just physical memory.

Thanks for the info about Windows filesystem cache.