08-05-2014 12:46 PM
I've got several 5220s and when I check "top" on them I see that they are all using all available memory and are into swap. I will be restarting these appliances in the near future so will be able to monitor this usage more closely, but in your experiences have your appliances tended to use up all their memory and get into swap space like this?
Granted - they aren't using a whole lot of swap (4-6GB), but these systems have 96GB of memory so I'm kind of surprised that there is any swap use at all.
5220 appliances running 220.127.116.11 74TB storage (64TB MSDP) 96GB memory
08-05-2014 03:20 PM
Please refer to TECH184147 as this is expected behaviour. Are you seeing some sort of performance issue or just curious?
08-06-2014 02:58 PM
I'm familiar with this sort of behavior in Linux - the thing is, with "normal" usage of all the memory in Linux there is NO swap use. Once swap space starts getting used, there generally is some kind of issue. Especially when talking systems with 96GB of memory. If there was 0 swap use I wouldn't be concerned.
maintenance-!> free -m total used free shared buffers cached Mem: 96303 96057 245 0 18 49332 -/+ buffers/cache: 46705 49597 Swap: 66671 5259 61412 maintenance-!>
08-06-2014 03:00 PM
I'm familiar with this behavior in Linux - but it generally doesn't result in any swap usage. The swap use is my concern.
I have been noticing what seem to be slower duplications/replications as of late, and that is what led me to this discovery...
08-07-2014 03:07 PM
I checked with a Appliance SME and with 2.6, this is normal. If its 2.5 then soimething is going on. You may want to open a case. What version are you on?
08-07-2014 03:38 PM
08-07-2014 03:52 PM
Then this is expected for the Swap. The slower deduplication as of late could be caused by many different things but no the swap. Refer to the perfomance tuning guide DOC7449. This will give information on how to calculate deduplication time, infomation, and perfomance consideration for deduplications.
08-20-2014 11:16 AM