I guess the point I was trying to make somewhat imperfectly is that while
the Linux guest might be able to access CKD disks and use SCSI protocols
that is all emulated by z/VM so it's difficult to see the advantages of
what the OP is asking.
On Wed, Dec 18, 2019, 12:39 AM Mike Schwab wrote:
> Yo
@LISTSERV.UA.EDU
Subject: Defining SCSI in DS8k box
Hello,
Could someone please recommend a manual which describes step by step
procedure to define SCSI on DS8K.
I need this procedure to define SCSI disk for my Linux guest running on zVM.
Peter
You will need to convert to using Linux containers without the z/VM
layer and FCP to open system volumes. I did this on ESS F20s, should
be similar for DS8xxx.
On Tue, Dec 17, 2019 at 2:44 AM Peter wrote:
>
> CKD are well supported for Linux guest.
>
> But having FBA disk to linux guest will imp
CKD are well supported for Linux guest.
But having FBA disk to linux guest will improve any sort of performance ?
On Tue, 17 Dec, 2019, 12:32 PM Laurence Chiu, wrote:
> Slightly outside my area of knowledge but since z/VM is the OS that is
> attached to the DS8K, it's doing the physical IO. And
>From the Linux documentation
https://www.kernel.org/doc/Documentation/s390/DASD it certainly seems that
ECKD disks are well supported. That aligns with my recollection of
experimentation of testing various zLinux in Hercules.
On Tue, Dec 17, 2019, 09:32 Laurence Chiu wrote:
> Slightly outside m
Slightly outside my area of knowledge but since z/VM is the OS that is
attached to the DS8K, it's doing the physical IO. And this is usually FICON.
The Linux guest is being provided a virtual disk from z/VM so the disk
protocol is probably not relevant. Plus I don't think a Linux guest can
actuall
I believe giving a dasd 3390(CKD) to linux guest and internally it converts
that into SCSI.
So having SCSI alone for Linux guest would be better interns of performance
?
On Tue, 17 Dec, 2019, 12:54 AM Laurence Chiu, wrote:
> I asked my z/VM and DS8K person this question and he wasn't sure what
I asked my z/VM and DS8K person this question and he wasn't sure what you
were asking.
He said he defines all the storage on his ds8k box as CKD though he could
have chosen fixed block and assigns all that storage to the z/vm host.
For each Linux instance that requires storage he just carves out
Hello,
Could someone please recommend a manual which describes step by step
procedure to define SCSI on DS8K.
I need this procedure to define SCSI disk for my Linux guest running on zVM.
Peter
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