Re: Defining SCSI in DS8k box
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: > 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 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 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 > > > actually see a CKD volume - it would all look ike FB. > > > > > > Others feel free to chip in here > > > > > > On Tue, Dec 17, 2019 at 4:45 PM Peter wrote: > > > > > > > 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 > > > 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 > the > > > hunk > > > > > of storage on Z/VM and assigns it to the Linux guest . > > > > > > > > > > SCSI is irrelevant because the Linux guest is virtual and doesn't > need > > > to > > > > > know about the disk protocol. And his z/VM host is connected via > > > FICON. > > > > > > > > > > He said the only time one might need to go back to the ds8k is if > some > > > of > > > > > the storage on that box hadn't been defined and needed to be > redefined > > > > and > > > > > then attached to the z/vm host. But he's never had to do that in 10 > > > years > > > > > of running that system. > > > > > > > > > > > > > > > > > > > > On Tue, Dec 17, 2019, 7:28 AM Peter wrote: > > > > > > > > > > > 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 > > > > > > > > > > > > > > > -- > > > > > > For IBM-MAIN subscribe / signoff / archive access instructions, > > > > > > send email to lists...@listserv.ua.edu with the message: INFO > > > IBM-MAIN > > > > > > > > > > > > > > > > > -- > > > > > For IBM-MAIN subscribe / signoff / archive access instructions, > > > > > send email to lists...@listserv.ua.edu with the message: INFO > IBM-MAIN > > > > > > > > > > > > > > -- > > > > For IBM-MAIN subscribe / signoff / archive access instructions, > > > > send email to lists...@listserv.ua.edu with the message: INFO > IBM-MAIN > > > > > > > > > > -- > > > For IBM-MAIN subscribe / signoff / archive access instructions, > > > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > > > > > > > -- > > For IBM-MAIN subscribe / signoff / archive access instructions, > > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > > > > -- > Mike A Schwab, Springfield IL USA > Where do Forest Rangers go to get away from it all? > > -- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: Defining SCSI in DS8k box
Do you need real SCSI LUNs or will a VM minidisk do? The latter is easier to manage. -- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 From: IBM Mainframe Discussion List on behalf of Peter Sent: Monday, December 16, 2019 1:28 PM To: IBM-MAIN@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 -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: Defining SCSI in DS8k box
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 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 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 > > actually see a CKD volume - it would all look ike FB. > > > > Others feel free to chip in here > > > > On Tue, Dec 17, 2019 at 4:45 PM Peter wrote: > > > > > 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 > > 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 the > > hunk > > > > of storage on Z/VM and assigns it to the Linux guest . > > > > > > > > SCSI is irrelevant because the Linux guest is virtual and doesn't need > > to > > > > know about the disk protocol. And his z/VM host is connected via > > FICON. > > > > > > > > He said the only time one might need to go back to the ds8k is if some > > of > > > > the storage on that box hadn't been defined and needed to be redefined > > > and > > > > then attached to the z/vm host. But he's never had to do that in 10 > > years > > > > of running that system. > > > > > > > > > > > > > > > > On Tue, Dec 17, 2019, 7:28 AM Peter wrote: > > > > > > > > > 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 > > > > > > > > > > > > -- > > > > > For IBM-MAIN subscribe / signoff / archive access instructions, > > > > > send email to lists...@listserv.ua.edu with the message: INFO > > IBM-MAIN > > > > > > > > > > > > > -- > > > > For IBM-MAIN subscribe / signoff / archive access instructions, > > > > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > > > > > > > > > > -- > > > For IBM-MAIN subscribe / signoff / archive access instructions, > > > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > > > > > > > -- > > For IBM-MAIN subscribe / signoff / archive access instructions, > > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > > > > -- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN -- Mike A Schwab, Springfield IL USA Where do Forest Rangers go to get away from it all? -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: Defining SCSI in DS8k box
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 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 > actually see a CKD volume - it would all look ike FB. > > Others feel free to chip in here > > On Tue, Dec 17, 2019 at 4:45 PM Peter wrote: > > > 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 > 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 the > hunk > > > of storage on Z/VM and assigns it to the Linux guest . > > > > > > SCSI is irrelevant because the Linux guest is virtual and doesn't need > to > > > know about the disk protocol. And his z/VM host is connected via > FICON. > > > > > > He said the only time one might need to go back to the ds8k is if some > of > > > the storage on that box hadn't been defined and needed to be redefined > > and > > > then attached to the z/vm host. But he's never had to do that in 10 > years > > > of running that system. > > > > > > > > > > > > On Tue, Dec 17, 2019, 7:28 AM Peter wrote: > > > > > > > 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 > > > > > > > > > -- > > > > For IBM-MAIN subscribe / signoff / archive access instructions, > > > > send email to lists...@listserv.ua.edu with the message: INFO > IBM-MAIN > > > > > > > > > > -- > > > For IBM-MAIN subscribe / signoff / archive access instructions, > > > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > > > > > > > -- > > For IBM-MAIN subscribe / signoff / archive access instructions, > > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > > > > -- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: Defining SCSI in DS8k box
>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 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 > actually see a CKD volume - it would all look ike FB. > > Others feel free to chip in here > > On Tue, Dec 17, 2019 at 4:45 PM Peter wrote: > > > 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 > 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 the > hunk > > > of storage on Z/VM and assigns it to the Linux guest . > > > > > > SCSI is irrelevant because the Linux guest is virtual and doesn't need > to > > > know about the disk protocol. And his z/VM host is connected via > FICON. > > > > > > He said the only time one might need to go back to the ds8k is if some > of > > > the storage on that box hadn't been defined and needed to be redefined > > and > > > then attached to the z/vm host. But he's never had to do that in 10 > years > > > of running that system. > > > > > > > > > > > > On Tue, Dec 17, 2019, 7:28 AM Peter wrote: > > > > > > > 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 > > > > > > > > > -- > > > > For IBM-MAIN subscribe / signoff / archive access instructions, > > > > send email to lists...@listserv.ua.edu with the message: INFO > IBM-MAIN > > > > > > > > > > -- > > > For IBM-MAIN subscribe / signoff / archive access instructions, > > > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > > > > > > > -- > > For IBM-MAIN subscribe / signoff / archive access instructions, > > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > > > > -- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: Defining SCSI in DS8k box
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 actually see a CKD volume - it would all look ike FB. Others feel free to chip in here On Tue, Dec 17, 2019 at 4:45 PM Peter wrote: > 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 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 the hunk > > of storage on Z/VM and assigns it to the Linux guest . > > > > SCSI is irrelevant because the Linux guest is virtual and doesn't need to > > know about the disk protocol. And his z/VM host is connected via FICON. > > > > He said the only time one might need to go back to the ds8k is if some of > > the storage on that box hadn't been defined and needed to be redefined > and > > then attached to the z/vm host. But he's never had to do that in 10 years > > of running that system. > > > > > > > > On Tue, Dec 17, 2019, 7:28 AM Peter wrote: > > > > > 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 > > > > > > -- > > > For IBM-MAIN subscribe / signoff / archive access instructions, > > > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > > > > > > > -- > > For IBM-MAIN subscribe / signoff / archive access instructions, > > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > > > > -- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: Defining SCSI in DS8k box
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 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 the hunk > of storage on Z/VM and assigns it to the Linux guest . > > SCSI is irrelevant because the Linux guest is virtual and doesn't need to > know about the disk protocol. And his z/VM host is connected via FICON. > > He said the only time one might need to go back to the ds8k is if some of > the storage on that box hadn't been defined and needed to be redefined and > then attached to the z/vm host. But he's never had to do that in 10 years > of running that system. > > > > On Tue, Dec 17, 2019, 7:28 AM Peter wrote: > > > 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 > > > > -- > > For IBM-MAIN subscribe / signoff / archive access instructions, > > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > > > > -- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
Re: Defining SCSI in DS8k box
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 the hunk of storage on Z/VM and assigns it to the Linux guest . SCSI is irrelevant because the Linux guest is virtual and doesn't need to know about the disk protocol. And his z/VM host is connected via FICON. He said the only time one might need to go back to the ds8k is if some of the storage on that box hadn't been defined and needed to be redefined and then attached to the z/vm host. But he's never had to do that in 10 years of running that system. On Tue, Dec 17, 2019, 7:28 AM Peter wrote: > 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 > > -- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
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 -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
