Re: fct0-worker Question

hpblades — Wed, 09 Dec 2009 22:56:39 GMT

This looks normal to me. If the server has an uptime of about 1.5 weeks (as you alluded to), then the 913 minutes of CPU would equate to approximately an average of 5% CPU utilization (of a single core).

There are actually 3 different processes (under Linux) to be aware of for each ioDrive that you may have installed:

fct[0..n]-worker
fio[a..z]-metadata-g
fio[a..z]-data-groom

The data and metadata grooming processes are performing operations on the NAND flash array in the background, performing wear levelling and other 'magic' maintenance tasks that give the ioDrive its reliability and lifetime.

The best way to check if there are any problems would be to monitor the ioDrive's status using the 'fio-status' utility (with the -a command line switch). Look for the "Media status" line. Here's an example (in this case using an HP IO Accelerator on an HP blade):

[root@linux ~]# fio-status -a /dev/fct0

Found 1 ioDrive in this system as device '/dev/fct0'
Fusion-io driver version: 1.2.7.2

fct0    Attached as 'fioa' (block device)
        HP StorageWorks 160GB IO Accelerator, Product Number:AJ877A SN:13599
        HP_Mezz3, PN:00119801003, Mfr:004, Date:20090820
        Alt PN:507151-001
        Firmware v36867
        160.92 GBytes block device size, 198 GBytes physical device size, Samsung SLC
        8192 blocks, 256 pages, 94528 bytes/page (25 pads, 1 planes, 4 banks)
        Error correction: 11 bits per 240 bytes, retire above 4 bits
        FPGA ID:0 Format UID:00000000351f01328fc4001c9012ac00
        PCI:03:00.0, Slot Number: Unavailable
        Vendor:1aed, Device:1005, Sub vendor:103c, Sub device:324d
        Internal temperature: avg 57.1 degC, max 58.1 degC
        Board temperature: 49 degC
        Internal voltage: avg 0.996V, max 0.996V
        Aux voltage: avg 2.476V, max 2.476V
        Media status: Healthy; Reserves: 100.00%, warn at 10%
           Data: 99.51%, MD: 99.63%
        Lifetime data volumes:
           Physical bytes written: 155,356,826,245,560
           Physical bytes read   : 122,798,635,771,096

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Re: fct0-worker Question