gpfs:gpfs_sizing
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gpfs:gpfs_sizing [2021/04/30 22:42] manu |
gpfs:gpfs_sizing [2024/06/21 17:05] (current) manu [NSD access] |
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| ===== Filesystem Block size, best practice ===== | ===== Filesystem Block size, best practice ===== | ||
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| + | Typically, metadata is between 1 and 5% of the filesystem space, but this can vary. | ||
| Depending on usage, you can have different **block size** | Depending on usage, you can have different **block size** | ||
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| During NSD creation alternate node position for access to NSD. | During NSD creation alternate node position for access to NSD. | ||
| If the first node is used as first node in NSD definition, then it 'll be only use and you'll reach performance problems | If the first node is used as first node in NSD definition, then it 'll be only use and you'll reach performance problems | ||
| - | I have a question regarding your NSD configuration below. Starting on NSD 'data_nsd043' up to NSD 'data_nsd106' the primary NSD server role rotated. | + | |
| - | Then you stopped to rotate primary server at NSD 'data_nsd107' and configured 'gpfs1' as your primary server. Which means every NSD task ( read/ write ... ) has to be handled by NSD server 'gpfs1' as long as he is reachable. | + | If only the first node is selected as first into NSD definition means every NSD task ( read/ write ... ) has to be handled by NSD server 'gpfs1' as long as he is reachable. |
| - | Such a configuration could cause a overload situation on the affected server. So my recommendation is to change it and to rotate it in the same manner like did up to NSD 'data_nsd106'! | + | Such a configuration could cause a overload situation on the affected server. |
| - | The NSD server sequence can be adjusted via command 'mmchnsd' ( see below ): | + | |
| + | The NSD server sequence can be adjusted online via command **mmchnsd** ( see below ): | ||
| https://www.ibm.com/docs/en/spectrum-scale/5.0.5?topic=disks-changing-your-nsd-configuration | https://www.ibm.com/docs/en/spectrum-scale/5.0.5?topic=disks-changing-your-nsd-configuration | ||
| - | <cli> | + | Ex: |
| + | <cli prompt='#'> | ||
| + | # mmchnsd "data_nsd043:gpfs03.gpfsint.labo,gpfs04.gpfsint.labo,gpfs01.gpfsint.labo,gpfs02.gpfsint.labo" | ||
| + | </cli> | ||
| + | |||
| + | Maybe easier with a description file | ||
| + | <cli prompt='#'> | ||
| + | # mmlsnsd -X | ||
| File system Disk name NSD volume ID NSD servers | File system Disk name NSD volume ID NSD servers | ||
| ------------------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------ | ||
gpfs/gpfs_sizing.1619815351.txt.gz · Last modified: 2021/04/30 22:42 by manu
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