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 Buzzard wrote: >On 13/06/16 18:53, Marc A Kaplan wrote: >> How do you set the size of a ZFS file that is simulating a

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

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

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

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

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

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