Re: [gpfsug-discuss] GPFS on ZFS! ... ?
@JAB Same here passing the same LVM LV's through to multiple KVM instances works a treat for testing. -- Lauz On 13 June 2016 22:05:20 EEST, Jonathan Buzzardwrote: >On 13/06/16 18:53, Marc A Kaplan wrote: >> How do you set the size of a ZFS file that is simulating a GPFS disk? >> How do "tell" GPFS about that? >> >> How efficient is this layering, compared to just giving GPFS direct >> access to the same kind of LUNs that ZFS is using? >> >> Hmmm... to partially answer my question, I do something similar, but >> strictly for testing non-performance critical GPFS functions. >> On any file system one can: >> >>dd if=/dev/zero of=/fakedisks/d3 count=1 bs=1M seek=3000 # create >a >> fake 3GB disk for GPFS >> >> Then use a GPFS nsd configuration record like this: >> >> %nsd: nsd=d3 device=/fakedisks/d3 usage=dataOnly pool=xtra >> servers=bog-xxx >> >> Which starts out as sparse and the filesystem will dynamically "grow" >as >> GPFS writes to it... >> >> But I have no idea how well this will work for a critical >"production" >> system... >> > >For "testing" purposes I just create a logical volume and map it >through >to my bunch of GPFS KVM instances as a disk. Works a treat and SSD's >are >silly money these days so for testing performance is just fine. There >was a 960GB SanDisk on offer for 160GBP last month. > >JAB. > >-- >Jonathan A. Buzzard Email: jonathan (at) buzzard.me.uk >Fife, United Kingdom. >___ >gpfsug-discuss mailing list >gpfsug-discuss at spectrumscale.org >http://gpfsug.org/mailman/listinfo/gpfsug-discuss -- Sent from my Android device with K-9 Mail. Please excuse my brevity.___ gpfsug-discuss mailing list gpfsug-discuss at spectrumscale.org http://gpfsug.org/mailman/listinfo/gpfsug-discuss
Re: [gpfsug-discuss] GPFS on ZFS! ... ?
To specify the size of the disks GPFS uses one can use zvols. Then one can turn on the zfs setting sync=always to perform safe writes since I'm using SATA cards there is no BBU. In our testing, turning sync=on creates a 20%-30% decrease in overall throughput on writes. I do not have numbers of this setup vs hardware RAID6. Thanks, Chris From: gpfsug-discuss-boun...@spectrumscale.org [gpfsug-discuss-boun...@spectrumscale.org] on behalf of Jaime Pinto [pi...@scinet.utoronto.ca] Sent: Monday, June 13, 2016 12:02 To: gpfsug-discuss@spectrumscale.org Subject: Re: [gpfsug-discuss] GPFS on ZFS! ... ? As Marc, I also have questions related to performance. Assuming we let ZFS take care of the underlying software raid, what would be the difference between GPFS and Lustre for instance, for the "parallel serving" at scale part of the file system. What would keep GPFS from performing or functioning just as well? Thanks Jaime Quoting "Marc A Kaplan": > How do you set the size of a ZFS file that is simulating a GPFS disk? How > do "tell" GPFS about that? > > How efficient is this layering, compared to just giving GPFS direct access > to the same kind of LUNs that ZFS is using? > > Hmmm... to partially answer my question, I do something similar, but > strictly for testing non-performance critical GPFS functions. > On any file system one can: > > dd if=/dev/zero of=/fakedisks/d3 count=1 bs=1M seek=3000 # create a > fake 3GB disk for GPFS > > Then use a GPFS nsd configuration record like this: > > %nsd: nsd=d3 device=/fakedisks/d3 usage=dataOnly pool=xtra > servers=bog-xxx > > Which starts out as sparse and the filesystem will dynamically "grow" as > GPFS writes to it... > > But I have no idea how well this will work for a critical "production" > system... > > tx, marc kaplan. > > > > From: "Allen, Benjamin S." > To: gpfsug main discussion list > Date: 06/13/2016 12:34 PM > Subject:Re: [gpfsug-discuss] GPFS on ZFS? > Sent by:gpfsug-discuss-boun...@spectrumscale.org > > > > Jaime, > > See > https://www.ibm.com/support/knowledgecenter/STXKQY_4.2.0/com.ibm.spectrum.scale.v4r2.adm.doc/bl1adm_nsddevices.htm > . An example I have for add /dev/nvme* devices: > > * GPFS doesn't know how that /dev/nvme* are valid block devices, use a > user exit script to let it know about it > > cp /usr/lpp/mmfs/samples/nsddevices.sample /var/mmfs/etc/nsddevices > > * Edit /var/mmfs/etc/nsddevices, and add to linux section: > > if [[ $osName = Linux ]] > then > : # Add function to discover disks in the Linux environment. > for dev in $( cat /proc/partitions | grep nvme | awk '{print $4}' ) > do > echo $dev generic > done > fi > > * Copy edited nsddevices to the rest of the nodes at the same path > for host in n01 n02 n03 n04; do > scp /var/mmfs/etc/nsddevices ${host}:/var/mmfs/etc/nsddevices > done > > > Ben > >> On Jun 13, 2016, at 11:26 AM, Jaime Pinto > wrote: >> >> Hi Chris >> >> As I understand, GPFS likes to 'see' the block devices, even on a > hardware raid solution such as DDN's. >> >> How is that accomplished when you use ZFS for software raid? >> On page 4, I see this info, and I'm trying to interpret it: >> >> General Configuration >> ... >> * zvols >> * nsddevices >> - echo "zdX generic" >> >> >> Thanks >> Jaime >> >> Quoting "Hoffman, Christopher P" : >> >>> Hi Jaime, >>> >>> What in particular would you like explained more? I'd be more than > happy to discuss things further. >>> >>> Chris >>> >>> From: gpfsug-discuss-boun...@spectrumscale.org > [gpfsug-discuss-boun...@spectrumscale.org] on behalf of Jaime Pinto > [pi...@scinet.utoronto.ca] >>> Sent: Monday, June 13, 2016 10:11 >>> To: gpfsug main discussion list >>> Subject: Re: [gpfsug-discuss] GPFS on ZFS? >>> >>> I just came across this presentation on "GPFS with underlying ZFS >>> block devices", by Christopher Hoffman, Los Alamos National Lab, >>> although some of the >>> implementation remains obscure. >>> >>> http://files.gpfsug.org/presentations/2016/anl-june/LANL_GPFS_ZFS.pdf >>> >>> It would be great to have more details, in particular the possibility >>> of straight use of GPFS on ZFS, instead of the 'archive' use case as >>> described on the presentation. >>> >>> Thanks >>> Jaime >>> >>> >>> >>> >>> Quoting "Jaime Pinto" : >>> Since we can not get GNR outside ESS/GSS appliances, is anybody using ZFS for software raid on commodity storage? Thanks Jaime >>> >>> >>> >>> >>> >>> TELL US ABOUT YOUR SUCCESS STORIES >>> http://www.scinethpc.ca/testimonials >>> >>> --- >>> Jaime Pinto >>> SciNet HPC Consortium - Compute/Calcul Canada >>>
Re: [gpfsug-discuss] GPFS on ZFS! ... ?
As Marc, I also have questions related to performance. Assuming we let ZFS take care of the underlying software raid, what would be the difference between GPFS and Lustre for instance, for the "parallel serving" at scale part of the file system. What would keep GPFS from performing or functioning just as well? Thanks Jaime Quoting "Marc A Kaplan": How do you set the size of a ZFS file that is simulating a GPFS disk? How do "tell" GPFS about that? How efficient is this layering, compared to just giving GPFS direct access to the same kind of LUNs that ZFS is using? Hmmm... to partially answer my question, I do something similar, but strictly for testing non-performance critical GPFS functions. On any file system one can: dd if=/dev/zero of=/fakedisks/d3 count=1 bs=1M seek=3000 # create a fake 3GB disk for GPFS Then use a GPFS nsd configuration record like this: %nsd: nsd=d3 device=/fakedisks/d3 usage=dataOnly pool=xtra servers=bog-xxx Which starts out as sparse and the filesystem will dynamically "grow" as GPFS writes to it... But I have no idea how well this will work for a critical "production" system... tx, marc kaplan. From: "Allen, Benjamin S." To: gpfsug main discussion list Date: 06/13/2016 12:34 PM Subject:Re: [gpfsug-discuss] GPFS on ZFS? Sent by:gpfsug-discuss-boun...@spectrumscale.org Jaime, See https://www.ibm.com/support/knowledgecenter/STXKQY_4.2.0/com.ibm.spectrum.scale.v4r2.adm.doc/bl1adm_nsddevices.htm . An example I have for add /dev/nvme* devices: * GPFS doesn't know how that /dev/nvme* are valid block devices, use a user exit script to let it know about it cp /usr/lpp/mmfs/samples/nsddevices.sample /var/mmfs/etc/nsddevices * Edit /var/mmfs/etc/nsddevices, and add to linux section: if [[ $osName = Linux ]] then : # Add function to discover disks in the Linux environment. for dev in $( cat /proc/partitions | grep nvme | awk '{print $4}' ) do echo $dev generic done fi * Copy edited nsddevices to the rest of the nodes at the same path for host in n01 n02 n03 n04; do scp /var/mmfs/etc/nsddevices ${host}:/var/mmfs/etc/nsddevices done Ben On Jun 13, 2016, at 11:26 AM, Jaime Pinto wrote: Hi Chris As I understand, GPFS likes to 'see' the block devices, even on a hardware raid solution such as DDN's. How is that accomplished when you use ZFS for software raid? On page 4, I see this info, and I'm trying to interpret it: General Configuration ... * zvols * nsddevices - echo "zdX generic" Thanks Jaime Quoting "Hoffman, Christopher P" : Hi Jaime, What in particular would you like explained more? I'd be more than happy to discuss things further. Chris From: gpfsug-discuss-boun...@spectrumscale.org [gpfsug-discuss-boun...@spectrumscale.org] on behalf of Jaime Pinto [pi...@scinet.utoronto.ca] Sent: Monday, June 13, 2016 10:11 To: gpfsug main discussion list Subject: Re: [gpfsug-discuss] GPFS on ZFS? I just came across this presentation on "GPFS with underlying ZFS block devices", by Christopher Hoffman, Los Alamos National Lab, although some of the implementation remains obscure. http://files.gpfsug.org/presentations/2016/anl-june/LANL_GPFS_ZFS.pdf It would be great to have more details, in particular the possibility of straight use of GPFS on ZFS, instead of the 'archive' use case as described on the presentation. Thanks Jaime Quoting "Jaime Pinto" : Since we can not get GNR outside ESS/GSS appliances, is anybody using ZFS for software raid on commodity storage? Thanks Jaime TELL US ABOUT YOUR SUCCESS STORIES http://www.scinethpc.ca/testimonials --- Jaime Pinto SciNet HPC Consortium - Compute/Calcul Canada www.scinet.utoronto.ca - www.computecanada.org University of Toronto 256 McCaul Street, Room 235 Toronto, ON, M5T1W5 P: 416-978-2755 C: 416-505-1477 This message was sent using IMP at SciNet Consortium, University of Toronto. ___ gpfsug-discuss mailing list gpfsug-discuss at spectrumscale.org http://gpfsug.org/mailman/listinfo/gpfsug-discuss ___ gpfsug-discuss mailing list gpfsug-discuss at spectrumscale.org http://gpfsug.org/mailman/listinfo/gpfsug-discuss TELL US ABOUT YOUR SUCCESS STORIES http://www.scinethpc.ca/testimonials --- Jaime Pinto SciNet HPC Consortium - Compute/Calcul Canada www.scinet.utoronto.ca - www.computecanada.org University of Toronto 256 McCaul Street, Room 235 Toronto, ON, M5T1W5 P:
Re: [gpfsug-discuss] GPFS on ZFS! ... ?
How do you set the size of a ZFS file that is simulating a GPFS disk? How do "tell" GPFS about that? How efficient is this layering, compared to just giving GPFS direct access to the same kind of LUNs that ZFS is using? Hmmm... to partially answer my question, I do something similar, but strictly for testing non-performance critical GPFS functions. On any file system one can: dd if=/dev/zero of=/fakedisks/d3 count=1 bs=1M seek=3000 # create a fake 3GB disk for GPFS Then use a GPFS nsd configuration record like this: %nsd: nsd=d3 device=/fakedisks/d3 usage=dataOnly pool=xtra servers=bog-xxx Which starts out as sparse and the filesystem will dynamically "grow" as GPFS writes to it... But I have no idea how well this will work for a critical "production" system... tx, marc kaplan. From: "Allen, Benjamin S."To: gpfsug main discussion list Date: 06/13/2016 12:34 PM Subject:Re: [gpfsug-discuss] GPFS on ZFS? Sent by:gpfsug-discuss-boun...@spectrumscale.org Jaime, See https://www.ibm.com/support/knowledgecenter/STXKQY_4.2.0/com.ibm.spectrum.scale.v4r2.adm.doc/bl1adm_nsddevices.htm . An example I have for add /dev/nvme* devices: * GPFS doesn't know how that /dev/nvme* are valid block devices, use a user exit script to let it know about it cp /usr/lpp/mmfs/samples/nsddevices.sample /var/mmfs/etc/nsddevices * Edit /var/mmfs/etc/nsddevices, and add to linux section: if [[ $osName = Linux ]] then : # Add function to discover disks in the Linux environment. for dev in $( cat /proc/partitions | grep nvme | awk '{print $4}' ) do echo $dev generic done fi * Copy edited nsddevices to the rest of the nodes at the same path for host in n01 n02 n03 n04; do scp /var/mmfs/etc/nsddevices ${host}:/var/mmfs/etc/nsddevices done Ben > On Jun 13, 2016, at 11:26 AM, Jaime Pinto wrote: > > Hi Chris > > As I understand, GPFS likes to 'see' the block devices, even on a hardware raid solution such at DDN's. > > How is that accomplished when you use ZFS for software raid? > On page 4 I see this info, and I'm trying to interpret it: > > General Configuration > ... > * zvols > * nsddevices > - echo "zdX generic" > > > Thanks > Jaime > > Quoting "Hoffman, Christopher P" : > >> Hi Jaime, >> >> What in particular would you like explained more? I'd be more than happy to discuss things further. >> >> Chris >> >> From: gpfsug-discuss-boun...@spectrumscale.org [gpfsug-discuss-boun...@spectrumscale.org] on behalf of Jaime Pinto [pi...@scinet.utoronto.ca] >> Sent: Monday, June 13, 2016 10:11 >> To: gpfsug main discussion list >> Subject: Re: [gpfsug-discuss] GPFS on ZFS? >> >> I just came across this presentation on "GPFS with underlying ZFS >> block devices", by Christopher Hoffman, Los Alamos National Lab, >> although some of the >> implementation remains obscure. >> >> http://files.gpfsug.org/presentations/2016/anl-june/LANL_GPFS_ZFS.pdf >> >> It would be great to have more details, in particular the possibility >> of straight use of GPFS on ZFS, instead of the 'archive' use case as >> described on the presentation. >> >> Thanks >> Jaime >> >> >> >> >> Quoting "Jaime Pinto" : >> >>> Since we can not get GNR outside ESS/GSS appliances, is anybody using >>> ZFS for software raid on commodity storage? >>> >>> Thanks >>> Jaime >>> >>> >> >> >> >> >> >> TELL US ABOUT YOUR SUCCESS STORIES >> http://www.scinethpc.ca/testimonials >> >> --- >> Jaime Pinto >> SciNet HPC Consortium - Compute/Calcul Canada >> www.scinet.utoronto.ca - www.computecanada.org >> University of Toronto >> 256 McCaul Street, Room 235 >> Toronto, ON, M5T1W5 >> P: 416-978-2755 >> C: 416-505-1477 >> >> >> This message was sent using IMP at SciNet Consortium, University of Toronto. >> >> ___ >> gpfsug-discuss mailing list >> gpfsug-discuss at spectrumscale.org >> http://gpfsug.org/mailman/listinfo/gpfsug-discuss >> ___ >> gpfsug-discuss mailing list >> gpfsug-discuss at spectrumscale.org >> http://gpfsug.org/mailman/listinfo/gpfsug-discuss >> > > > > > > > > TELL US ABOUT YOUR SUCCESS STORIES > http://www.scinethpc.ca/testimonials > > --- > Jaime Pinto > SciNet HPC Consortium - Compute/Calcul Canada > www.scinet.utoronto.ca - www.computecanada.org > University of Toronto > 256 McCaul Street, Room 235 > Toronto, ON, M5T1W5 > P: 416-978-2755 > C: 416-505-1477 > >
Re: [gpfsug-discuss] GPFS on ZFS?
Jaime, See https://www.ibm.com/support/knowledgecenter/STXKQY_4.2.0/com.ibm.spectrum.scale.v4r2.adm.doc/bl1adm_nsddevices.htm. An example I have for add /dev/nvme* devices: * GPFS doesn't know how that /dev/nvme* are valid block devices, use a user exit script to let it know about it cp /usr/lpp/mmfs/samples/nsddevices.sample /var/mmfs/etc/nsddevices * Edit /var/mmfs/etc/nsddevices, and add to linux section: if [[ $osName = Linux ]] then : # Add function to discover disks in the Linux environment. for dev in $( cat /proc/partitions | grep nvme | awk '{print $4}' ) do echo $dev generic done fi * Copy edited nsddevices to the rest of the nodes at the same path for host in n01 n02 n03 n04; do scp /var/mmfs/etc/nsddevices ${host}:/var/mmfs/etc/nsddevices done Ben > On Jun 13, 2016, at 11:26 AM, Jaime Pintowrote: > > Hi Chris > > As I understand, GPFS likes to 'see' the block devices, even on a hardware > raid solution such at DDN's. > > How is that accomplished when you use ZFS for software raid? > On page 4 I see this info, and I'm trying to interpret it: > > General Configuration > ... > * zvols > * nsddevices > - echo "zdX generic" > > > Thanks > Jaime > > Quoting "Hoffman, Christopher P" : > >> Hi Jaime, >> >> What in particular would you like explained more? I'd be more than happy to >> discuss things further. >> >> Chris >> >> From: gpfsug-discuss-boun...@spectrumscale.org >> [gpfsug-discuss-boun...@spectrumscale.org] on behalf of Jaime Pinto >> [pi...@scinet.utoronto.ca] >> Sent: Monday, June 13, 2016 10:11 >> To: gpfsug main discussion list >> Subject: Re: [gpfsug-discuss] GPFS on ZFS? >> >> I just came across this presentation on "GPFS with underlying ZFS >> block devices", by Christopher Hoffman, Los Alamos National Lab, >> although some of the >> implementation remains obscure. >> >> http://files.gpfsug.org/presentations/2016/anl-june/LANL_GPFS_ZFS.pdf >> >> It would be great to have more details, in particular the possibility >> of straight use of GPFS on ZFS, instead of the 'archive' use case as >> described on the presentation. >> >> Thanks >> Jaime >> >> >> >> >> Quoting "Jaime Pinto" : >> >>> Since we can not get GNR outside ESS/GSS appliances, is anybody using >>> ZFS for software raid on commodity storage? >>> >>> Thanks >>> Jaime >>> >>> >> >> >> >> >> >> TELL US ABOUT YOUR SUCCESS STORIES >> http://www.scinethpc.ca/testimonials >> >> --- >> Jaime Pinto >> SciNet HPC Consortium - Compute/Calcul Canada >> www.scinet.utoronto.ca - www.computecanada.org >> University of Toronto >> 256 McCaul Street, Room 235 >> Toronto, ON, M5T1W5 >> P: 416-978-2755 >> C: 416-505-1477 >> >> >> This message was sent using IMP at SciNet Consortium, University of Toronto. >> >> ___ >> gpfsug-discuss mailing list >> gpfsug-discuss at spectrumscale.org >> http://gpfsug.org/mailman/listinfo/gpfsug-discuss >> ___ >> gpfsug-discuss mailing list >> gpfsug-discuss at spectrumscale.org >> http://gpfsug.org/mailman/listinfo/gpfsug-discuss >> > > > > > > > > TELL US ABOUT YOUR SUCCESS STORIES > http://www.scinethpc.ca/testimonials > > --- > Jaime Pinto > SciNet HPC Consortium - Compute/Calcul Canada > www.scinet.utoronto.ca - www.computecanada.org > University of Toronto > 256 McCaul Street, Room 235 > Toronto, ON, M5T1W5 > P: 416-978-2755 > C: 416-505-1477 > > > This message was sent using IMP at SciNet Consortium, University of Toronto. > > ___ > gpfsug-discuss mailing list > gpfsug-discuss at spectrumscale.org > http://gpfsug.org/mailman/listinfo/gpfsug-discuss ___ gpfsug-discuss mailing list gpfsug-discuss at spectrumscale.org http://gpfsug.org/mailman/listinfo/gpfsug-discuss
Re: [gpfsug-discuss] GPFS on ZFS?
hi chris, do you have any form of HA for the zfs blockdevices/jbod (eg when a nsd reboots/breaks/...)? or do you rely on replication within GPFS? stijn On 06/13/2016 06:19 PM, Hoffman, Christopher P wrote: > Hi Jaime, > > What in particular would you like explained more? I'd be more than happy to > discuss things further. > > Chris > > From: gpfsug-discuss-boun...@spectrumscale.org > [gpfsug-discuss-boun...@spectrumscale.org] on behalf of Jaime Pinto > [pi...@scinet.utoronto.ca] > Sent: Monday, June 13, 2016 10:11 > To: gpfsug main discussion list > Subject: Re: [gpfsug-discuss] GPFS on ZFS? > > I just came across this presentation on "GPFS with underlying ZFS > block devices", by Christopher Hoffman, Los Alamos National Lab, > although some of the > implementation remains obscure. > > http://files.gpfsug.org/presentations/2016/anl-june/LANL_GPFS_ZFS.pdf > > It would be great to have more details, in particular the possibility > of straight use of GPFS on ZFS, instead of the 'archive' use case as > described on the presentation. > > Thanks > Jaime > > > > > Quoting "Jaime Pinto": > >> Since we can not get GNR outside ESS/GSS appliances, is anybody using >> ZFS for software raid on commodity storage? >> >> Thanks >> Jaime >> >> > > > > > >TELL US ABOUT YOUR SUCCESS STORIES > http://www.scinethpc.ca/testimonials > > --- > Jaime Pinto > SciNet HPC Consortium - Compute/Calcul Canada > www.scinet.utoronto.ca - www.computecanada.org > University of Toronto > 256 McCaul Street, Room 235 > Toronto, ON, M5T1W5 > P: 416-978-2755 > C: 416-505-1477 > > > This message was sent using IMP at SciNet Consortium, University of Toronto. > > ___ > gpfsug-discuss mailing list > gpfsug-discuss at spectrumscale.org > http://gpfsug.org/mailman/listinfo/gpfsug-discuss > ___ > gpfsug-discuss mailing list > gpfsug-discuss at spectrumscale.org > http://gpfsug.org/mailman/listinfo/gpfsug-discuss > ___ gpfsug-discuss mailing list gpfsug-discuss at spectrumscale.org http://gpfsug.org/mailman/listinfo/gpfsug-discuss
Re: [gpfsug-discuss] GPFS on ZFS?
Hi Jaime, What in particular would you like explained more? I'd be more than happy to discuss things further. Chris From: gpfsug-discuss-boun...@spectrumscale.org [gpfsug-discuss-boun...@spectrumscale.org] on behalf of Jaime Pinto [pi...@scinet.utoronto.ca] Sent: Monday, June 13, 2016 10:11 To: gpfsug main discussion list Subject: Re: [gpfsug-discuss] GPFS on ZFS? I just came across this presentation on "GPFS with underlying ZFS block devices", by Christopher Hoffman, Los Alamos National Lab, although some of the implementation remains obscure. http://files.gpfsug.org/presentations/2016/anl-june/LANL_GPFS_ZFS.pdf It would be great to have more details, in particular the possibility of straight use of GPFS on ZFS, instead of the 'archive' use case as described on the presentation. Thanks Jaime Quoting "Jaime Pinto": > Since we can not get GNR outside ESS/GSS appliances, is anybody using > ZFS for software raid on commodity storage? > > Thanks > Jaime > > TELL US ABOUT YOUR SUCCESS STORIES http://www.scinethpc.ca/testimonials --- Jaime Pinto SciNet HPC Consortium - Compute/Calcul Canada www.scinet.utoronto.ca - www.computecanada.org University of Toronto 256 McCaul Street, Room 235 Toronto, ON, M5T1W5 P: 416-978-2755 C: 416-505-1477 This message was sent using IMP at SciNet Consortium, University of Toronto. ___ gpfsug-discuss mailing list gpfsug-discuss at spectrumscale.org http://gpfsug.org/mailman/listinfo/gpfsug-discuss ___ gpfsug-discuss mailing list gpfsug-discuss at spectrumscale.org http://gpfsug.org/mailman/listinfo/gpfsug-discuss