Disk size

I'll start by saying that this is (or seems to be) a lot harder than it should be.

There are several ways to figure out the drive size based on things like the model string, the output of 'isi devices' to get the bay layout, etc, but most require some pre-knowlege (e.g. exact SSD number and capacity) to really be sure of the number.  And these other ways might be fine and easy if you do know that information; what I present below should be valid if you really have no pre-knowledge of the makeup of the node.

WARNING:  Below I suggest using the output of a sysctl.  In this instance that's fine and safe.  As a best practice, though, it's generally not a good idea to be playing around with sysctls unless explicitly told it's ok.

In any event, if you don't mind dipping into the CLI you can take a look at some information that OneFS has squirreled away about drive sizes.  Do this:

isilon-node# sysctl efs.gmp.infos | less

efs.gmp.infos: {

    use_count = 1

    info 0xfffff80331b63800 = {

        devid = 1

        group = <3,24>: { 1:0-21,24-25, 2:0-20,23-24, 3:0-21,24-25, smb: 1-3, nfs: 1-3, all_enabled_protocols: 1-3 }

        online = 1

        node_infos = {

            1 => {

                used_inodes = 103163548

                free_inodes = 39443221886

                total_inodes = 40909369766

                free_ssd_blocks = 185745811

                total_ssd_blocks = 193457902

                free_blocks = 3266325110

                total_blocks = 3387003686

                free_blocks_frac = 0.964370107

                free_inodes_frac = 0.964161073

                power = 1000

                physmem = 67080304

                ec_gen = 0x100020000000a

                has_ssd = true

                load = 0

                online = 1

                drive_infos = {

                    0 => {

                        used_inodes = 200387

                        free_inodes = 1690929732

                        total_inodes = 1753305622

                        used_blocks = 5157533

                        free_blocks = 139988495

                        total_blocks = 145161172

                        free_blocks_frac = 0.964365973

                        free_inodes_frac = 0.964423834

                        is_ssd = false

                        load = 0

                        purpose = STORAGE

                    },

...

...

You're interested in the "drive_infos" block, which lists information about each drive in the chassis.  You can see in my example that the first entry is an HDD and has 145161172 total blocks.  A block in OneFS is and has always been 8 KiB.  So:

145161172 * 8192 = 1189160321024 bytes/drive

Thus each drive is about:

1189160321024  / 1000^4 = 1.18 TB

You can verify this by the model string and some inference:

isilon-node# isi_hw_status -ic | grep Prod

Product: S210-2U-Dual-256GB-2x1GE-2x10GE SFP+-26TB-1638GB SSD

(my cluster is an s210 with 24 bays/chassis, with 22 HDD + 2 SSD, which you could have determined with 'isi devices')

26 TB / 22 drives = 1.18 TB/drive

which is probably reported in quotes and such as a 1.2 TB drive (these are SAS drives).

Thanks for Sharing the Information.

This really helped me confirming the disk size.

Regards

Pulkit Kaul.

In my cluster, my physical disk size is 1TB. The web GUI shows the drive detail is 1953525168 blks.

So I guess the size/blk here is 512 bytes.

1953525168 * 512 = 1000204886016 bytes

1000204886016 / 1000^4 = 1TB