0% pool allocated tracks, but 57% total written tracks?

did you look for that device in other pools, FAST moved its extents to different tiers ?

I did "symdev show 0FA3". It shows me the device is still bound to pool P1. From the result, could not find infor on where this device might be moved to.

However, this is a head of a meta group with 4 members. Is this meta group caused this symptom? and why? Thanks!

Try "symcfg list -tdev -detail -dev 0FA3"...

I typed exact command you supplied, but getting the following:

'-devs': Incompatible option.

Thanks!

It seems moved, allocated in the other pool P2, but written tracks is located in the bound pool P1.

it's likely that all the allocations for this device have been moved to other pools by FAST VP.

take a look at the details of the allocations for that device.  you can do this by running the command

    symcfg -sid xxx list -tdev -devs FA3 -detail

the -detail option shows the distribution of the device over multiple pools.

the allocated tracks value is reported for the actual number of tracks allocated for the device in the pool shown.  the tracks written value, however, is only ever reported against the pool the device is bound to.

SYMCLIGuy and Sean are both correct here, the written tracks are coming from a pool other than the bound pool, looking at the tdev with the -detail flag on the output will show you where exactly and it is most likely due to FAST VP and is completely normal.  The total written here is the total number of tracks written across all pools where this device has allocations.

Here is an example from one of my systems,

$ symcfg list -tdev -bound -detail -dev a2c

Symmetrix ID: 000XXXXXXXX

Enabled Capacity (Tracks) : 2281748004
Bound   Capacity (Tracks) :   11632650

                     S Y M M E T R I X   T H I N   D E V I C E S
-------------------------------------------------------------------------------------
                                    Pool         Pool           Total      Compressed
       Bound      Flags      Total  Subs      Allocated        Written     Size/Ratio
Sym  Pool Name    ESPT      Tracks   (%)     Tracks (%)     Tracks (%)     Tracks (%)
---- ------------ ----- ---------- ----- ---------- --- ---------- --- ---------- ---
0A2C FC_600 F..B    11632650     1         35664   0   11400925  98           35664  0
     SATA_2T    -.--                    -     -   11367096  98          -   -               11367096  0
     EFD_200     -.--                   -     -            4104   0          -   -                      4104   0

Total                   ---------- ----- ---------- --- ---------- --- ---------- ---
Tracks                    11632650     1   11406864   0   11400925   0   11406864   0

All the symcli commands related to FAST VP, as well as example outputs, are contained in the Implementing Fully Automated Storage Tiering for Virtual Pools (FAST VP) for EMC VMAX Series Arrays technical note available on support.emc.com.

Here's a link to the doc.

https://support.emc.com/docu31001_Implementing_Fully_Automated_Storage_Tiering_for_Virtual_Pools_(FAST_VP)_for_EMC_VMAX_Series_Arrays.pdf?language=en_US

Thank you all for sharing

What commands to show me the detail on FAST VP policy?

"symdev show 0FA3" tell me the original bound pool won't be changed as allocated pool changes.

in my case, it seesm the entire device is being moved to ATA_T2. In Paul Martin's case, it is shared by multiple tier's.

Enabled Capacity (Tracks) : 2672912640

Bound   Capacity (Tracks) :    2209680

                  S Y M M E T R I X   T H I N   D E V I C E S

-------------------------------------------------------------------------------

                                   Pool        Pool          Total

                  Flags     Total  Subs     Allocated       Written

Sym  Pool Name    EMSP     Tracks    (%)  Tracks  (%)  Tracks   (%) Status

---- ------------ ----- --------- ----- --------- --- --------- --- -----------

0FA3 FC_T1        FX..    2209680     0         0   0   1269492  57 Bound

     ATA_T2       --.-          -     -   1269624  57         -   - -

Total                   --------- ----- --------- --- --------- ---

Tracks                    2209680     0   1269624   0   1269492   0

symfast -sid 123 show -fp_name