[SERVER-4353] Getting faults and high IO % util but still have 30GB or RAM free Created: 22/Nov/11 Updated: 29/May/12 Resolved: 26/Jan/12 |
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| Status: | Closed |
| Project: | Core Server |
| Component/s: | None |
| Affects Version/s: | None |
| Fix Version/s: | None |
| Type: | Question | Priority: | Major - P3 |
| Reporter: | Ben Wyrosdick | Assignee: | Daniel Pasette (Inactive) |
| Resolution: | Done | Votes: | 0 |
| Labels: | None | ||
| Remaining Estimate: | Not Specified | ||
| Time Spent: | Not Specified | ||
| Original Estimate: | Not Specified | ||
| Environment: |
Ubuntu 11.04 |
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| Participants: |
| Description |
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We have a customer that is seeing slow response times on queries over a 75GB collection. They are on a 68GB EC2 box and it seems to not be using all the RAM but it is crushing IO and faulting according to mongostat. == iostat == Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util == mongostat == == free == hooking up MMS now ... I will write back once it is setup. |
| Comments |
| Comment by Daniel Pasette (Inactive) [ 24/Dec/11 ] | |||
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did you end up setting up MMS? Under which account name? | |||
| Comment by Scott Hernandez (Inactive) [ 22/Nov/11 ] | |||
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You don't have free memory: all of it is in use for cache. Your data is larger than memory and you seem to be accessing data not in memory, hence the faults.
MMS will help a bit to analyze things. | |||
| Comment by Ben Wyrosdick [ 22/Nov/11 ] | |||
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So I didn't finish my thought ... is there anything we need to do/change to make it consume the rest of the memory since it seems like it would help to have more RAM since it is faulting. | |||
| Comment by Ben Wyrosdick [ 22/Nov/11 ] | |||
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the paste failed so here are screenshots. http://cl.ly/2n451A1l122h0Z3c3O2R |