difference between filesystem size and volume size

Question

Hi All, Does anybody know why size is diferent between the nas_fs -size and nas_volume -size ? Or this question does not make sense ? # nas_fs -i file_system_name id        = 776 name      = file_system_name volume    = v627 auto_ext  = hwm=90%,max_size=3276800M (reached),thin=no disks     = d89,d37,d101,d49 # nas_fs -size file_system_name total = 3226800 avail = 947597 used = 2279203 ( 71% ) (sizes in MB) ( blockcount = 6710886400 ) volume: total = 3276800 (sizes in MB) ( blockcount = 6710886400 ) avail = 947597 used = 2329203 ( 71% ) # nas_volume -info v627 id          = 627 name        = v627 acl         = 0 in_use      = True type        = meta volume_set  = s164,v3998,v4000,v4016,v4026,v4030,v4032,v4034,v4038,v4108,v4134,v4142,v4212,v4214,v5097,v5101,v5105,v5123,v5474,v5476,v6176,v6404,v7444,v7648,v7650,v7656,v7681 disks       = d89,d37,d101,d49 # nas_volume -size v627 total = 3276800 avail = 0 used = 3276800 ( 100% ) (sizes in MB) File system size shows total = 3226800 avail = 947597 used = 2279203 while nas_volume shows total = 3276800 avail = 0 used = 3276800 ( 100% ) (sizes in MB). where is located available space reported on nas_fs -size output ? I have checked all volumes and they have nothing in availabe space. Maybe, the space is tottaly allocated to filesystem, and  nas_fs -size reads information from filesystem metadata instead of reads from volumes. This question is just a curiosity about how the nas_fs command build the ouptut. We are investigating some problems with filesystem checkpoints and savvol utilization. We already found that the filesystem has high writes and modification which requires a lot of space on savvol to refreshes ckpts. Thanks in advance for replies. Marcos

Rainer_EMC · Answer

As the names imply nas_fs looks at the free/used space inside the fs where nas_volume looks at the raw volume

Peter_EMC · Answer

There is no difference in your example between the nas_fs -size output (regarding the volume size) and the nas_volume -size output.

Both are reporting the size of the volume as 3276800 MB

> # nas_fs -size file_system_name

> total = 3226800 avail = 947597 used = 2279203 ( 71% ) (sizes in MB) ( blockcount = 6710886400 )

> volume: total = 3276800 (sizes in MB) ( blockcount = 6710886400 ) avail = 947597 used = 2329203 ( 71% )

nas_fs -size is reporting a volume of 3276800 MB for a FS of 3226800 MB

Celerra

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