Home > Storage > PowerScale (Isilon) > Product Documentation > Storage (general) > PowerScale OneFS: Cluster Composition, Quorum, and Group State > OneFS 8.2.x enhancements
In OneFS 8.2 and later, the unique, cluster-wide GMP ID is instead replaced with a unique GMP Cookie on each node. For example
# sysctl efs.gmp.group
efs.gmp.group: <889a5e> (5) :{ 1-3:0-5, smb: 1-3, nfs: 1-3, all_enabled_protocols: 1-3, isi_cbind_d: 1-3, lsass: 1-3, s3: 1-3 }
The GMP Cookie is a hexadecimal number. The initial value is calculated as a function of the current time, so it remains unique even after a node is rebooted. The cookie changes whenever there is a GMP event and is unique on power-up. In this instance, the (5) represents the configuration generation number.
In the interest of ease of readability in large clusters, logging verbosity is also reduced in OneFS 8.2 and later. Take the following syslog entry, for example:
2024-03-23T15:27:40-07:00 <0.5> (id1) /boot/kernel.amd64/kernel: connects: { { 1.7.135.(65-67)=>1-3 (IP), 0.0.0.0=>1-3, 0.0.0.0=>1-3, }, cfg_gen:1=>1-3, owv:{ build_version=0x0802009000000478 overrides=[ { version=0x08020000 bitmask=0x0000ae1d7fffffff }, { version=0x09000100 bitmask=0x0000000000004151 } ] }=>1-3, }
Only the lowest node number in a group proposes a merge or split to avoid too many retries from multiple proposing nodes.
GMP will always select nodes to merge to form the biggest group and equal size groups will be weighted towards the smaller node numbers. For example:
{1, 2, 3, 5} > {1, 2, 4, 5}