Site
| Question | ________________________________Response__________________________________ |
| Site and Endpoints | |
|---|---|
| What is the site name? | FNAL |
| Which endpoint URLs do your archival systems expose? | srm://cmssrm.fnal.gov srm://cmsdca2.fnal.gov |
| How is tape storage selected for a write (choice of endpoint, specification of a spacetoken, namespace prefix). | metadata tags in the namespace directory tree |
| Queue | |
| What limits should clients respect? | |
| ---> Max number of outstanding requests in number of files or data volume | queue depth is ~15k, if full, clients retry |
| ---> Max submission rate for recalls or queries | no limit |
| ---> Min/Max bulk request size (srmBringOnline or equivalent) in files or data volume | no limit |
| Should clients back off under certain circumstances? | |
| ---> How is this signalled to client? | |
| ---> For which operations? | |
| Is it advantageous to group requests by a particular criterion (e.g. tape family, date)? | |
| ---> What criterion? | |
| Prioritisation | |
| Can you handle priority requests? | |
| ---> How is this requested? | |
| Protocol support | |
| Are there any unsupported or partially supported operations (e.g. pinning) ? | |
| Timeouts | |
| What timeouts do you recommend? | |
| Do you have hardcoded or default timeouts? | |
| Operations and metrics | |
| Can you provide total sum of data stored by VO in the archive to 100TB accuracy? | yes |
| Can you provide space occupied on tapes by VO (includes deleted data, but not yet reclaimed space) to 100TB accuracy? | yes |
| How do you allocate free tape space to VOs? | quatos on a common pool |
| What is the frequency with which you run repack operations to reclaim space on tapes after data deletion? | frequently with CMS |
| Recommendations for clients | |
| Recommendation 1 | |
| ---> Information required by users to follow advice | |
| Recommendation 2 | |
| Buffer Management | |
| Should a client stop submitting recalls if the available buffer space reaches a threshold? | |
| ---> How can a client determine the buffer used and free space? | |
| ---> What is the threshold (high water mark)? | |
| ---> When should the client restart submission (low water mark)? | |
| If the client does not have to back off on a full buffer, and you support pinning, how is the buffer managed? | |
| ---> Is data moved from buffer to another local disk, either by the HSM or by an external agent? | |
| Additional questions | |
| Should any other questions appear in subsequent iterations of this survey? | |
This topic: HEPTape > WebHome > Survey > FNAL_Survey
Topic revision: r4 - 2018-04-19 - OliverKeeble
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