[LUDOC-284] ext4 OST maximum size Created: 30/Apr/15 Updated: 23/Feb/16 Resolved: 23/Feb/16 |
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| Status: | Resolved |
| Project: | Lustre Documentation |
| Component/s: | None |
| Affects Version/s: | None |
| Fix Version/s: | None |
| Type: | Question/Request | Priority: | Minor |
| Reporter: | Andreas Dilger | Assignee: | Bob Glossman (Inactive) |
| Resolution: | Fixed | Votes: | 0 |
| Labels: | None | ||
| Issue Links: |
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| Rank (Obsolete): | 9223372036854775807 | ||||||||
| Description |
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What is the maximum OST size using ext4 filesystems in a supported installation? |
| Comments |
| Comment by Peter Jones [ 30/Apr/15 ] |
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Bob Could you please point to where this information is available? Thanks Peter |
| Comment by Bob Glossman (Inactive) [ 30/Apr/15 ] |
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This is documented in the Lustre manual: https://build.hpdd.intel.com/job/lustre-manual/lastSuccessfulBuild/artifact/lustre_manual.xhtml#understandinglustre.tab1 Table entries for OSS Scalability: Current Practical range: 128TB per OST |
| Comment by Andreas Dilger [ 08/May/15 ] |
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This is a bit outdated, and could stand to be updated in the manual. We have many sites using OSTs in the 24TB (3TB * 8+2 RAID-6) to 32TB (4TB * 8+2 RAID-6) range. There aren't expected to be any significant issues with 5 or 6TB drives (the big hurdle was at 16TB when exceeding 2^32 blocks), though SMR HDDs may cause performance issues for small file workloads as ext4 has not really been optimized for that technology yet. I'm going to move this over to an LUDOC ticket to update the manual. |
| Comment by Gerrit Updater [ 02/Jun/15 ] |
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Andreas Dilger (andreas.dilger@intel.com) uploaded a new patch: http://review.whamcloud.com/15106 |
| Comment by Gerrit Updater [ 24/Jun/15 ] |
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Andreas Dilger (andreas.dilger@intel.com) merged in patch http://review.whamcloud.com/15106/ |