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82 Posts
0
1422
FAST VP health check
Guys - Checking if someone assist me on monitoring pool when we implement FAST VP on vmax 40k frames
well, i have three pools(SSD, FC & SATA) and i always map dev/lun to FC pool....
but i always get alarms that SSD pool is 98% used. at this moment im unsure on how to react if this values is normal.
of course i understand that FAST-VP promotes and demotes LUN level data across storage tiers(EFD/FC/SATA tiers) to accomplish performance but I’m still checking below SDD pool usage(94%) is still optimal.
S Y M M E T R I X P O O L S
---------------------------------------------------------------------------
Pool Flags Dev Usable Free Used Full Comp
Name PTECSL Config Tracks Tracks Tracks (%) (%)
------------ ------ ------------ ---------- ---------- ---------- ---- ----
DEFAULT_POOL SSF-EI RAID-6(6+2) 909480720 185803141 723677579 79 0
123_tp_SATA_1 TSFDEI RAID-6(6+2) 1133247552 585256860 547990692 48 0
123_tp_FC_1 TFFDEI RAID-6(6+2) 743429220 418883160 324546060 43 0
123_tp_SSD_1 TEFDEI RAID-6(6+2) 214999260 2193864 212805396 98 0
haralson
26 Posts
1
August 13th, 2015 05:00
If you have no TDEV bound to the flash, pool, then there is no cause for concern and I would change or disable your alerting in Unisphere on the SSD pool. In general, under FASTVP best practices, you want the SSD pool full with all devices bound to FC pool. It's a good thing!
tk_venu
82 Posts
0
August 14th, 2015 01:00
Thanks for the clarification but what will happen internally when SSD is reaches 100% ?
when do i justify if i need to add few new SSD's to the pool...
2) well, in below case(other frame) i see SSD usage is 87% and SATA is at 96% but no TDEV's are mapped to neither to SSD nor to SATA.
brinderbhullar
2 Posts
0
August 19th, 2015 14:00
If you are not binding anything to SSD drives and the pool reserve capacity is set to 1% (I guess it is set to 2% in your case) the pool will never go to 100%.
This is normal behavior. Same is true for SATA disks.
tk_venu
82 Posts
0
August 19th, 2015 22:00
Thanks for the info. bwt, how do i know if my pool reserve capacity is set to 1% or 2%? - is there any cmd to know.
brinderbhullar
2 Posts
0
August 20th, 2015 07:00
There are two different parameters where this is controlled.
First is at Fast level and that is the global for all the thin pool.
It is supposed to be 10% and do not change this. To see what it is set to run this command
symfast -sid XXXX list -control_parms |grep "Thin Pool Reserved Capacity(%)"
Make sure it is set to 10%
Second the parameter is based on each pool and here is where you want to set it to 1%
Command to see it is
symcfg -sid XXXX show -pool -detail -thin |grep "Pool Reserved Capacity"
You can change this with symconfigure command
set pool, type thin, pool_resv_cap=
With unisphere the first capacity can be changed/looked at in fast VP setting
The individual setting can be changed at storage>Thinpools >Pool_Name
Hope this answers your question
tk_venu
82 Posts
0
August 21st, 2015 04:00
Thanks Friends(Haralson & Rednirb).