Hi, it's for a traditional NSD setup. --Joey
On 6/26/18 12:21 AM, Sven Oehme wrote: > Joseph, > > the subblocksize will be derived from the smallest blocksize in the > filesytem, given you specified a metadata block > size of 512k thats what will be used to calculate the number of subblocks, > even your data pool is 4mb. > is this setup for a traditional NSD Setup or for GNR as the recommendations > would be different. > > sven > > On Tue, Jun 26, 2018 at 2:59 AM Joseph Mendoza <[email protected] > <mailto:[email protected]>> wrote: > > Quick question, anyone know why GPFS wouldn't respect the default for > the subblocks-per-full-block parameter when creating a new filesystem? > I'd expect it to be set to 512 for an 8MB block size but my guess is > that also specifying a metadata-block-size is interfering with it (by > being too small). This was a parameter recommended by the vendor for a > 4.2 installation with metadata on dedicated SSDs in the system pool, any > best practices for 5.0? I'm guessing I'd have to bump it up to at least > 4MB to get 512 subblocks for both pools. > > fs1 created with: > # mmcrfs fs1 -F fs1_ALL -A no -B 8M -i 4096 -m 2 -M 2 -r 1 -R 2 -j > cluster -n 9000 --metadata-block-size 512K --perfileset-quota > --filesetdf -S relatime -Q yes --inode-limit 20000000:10000000 -T > /gpfs/fs1 > > # mmlsfs fs1 > <snipped> > > flag value description > ------------------- ------------------------ > ----------------------------------- > -f 8192 Minimum fragment (subblock) > size in bytes (system pool) > 131072 Minimum fragment (subblock) > size in bytes (other pools) > -i 4096 Inode size in bytes > -I 32768 Indirect block size in bytes > > -B 524288 Block size (system pool) > 8388608 Block size (other pools) > > -V 19.01 (5.0.1.0) File system version > > --subblocks-per-full-block 64 Number of subblocks per > full block > -P system;DATA Disk storage pools in file > system > > > Thanks! > --Joey Mendoza > NCAR > _______________________________________________ > gpfsug-discuss mailing list > gpfsug-discuss at spectrumscale.org <http://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
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