[gpfsug-discuss] Using HAWC (write cache)

Simon Thompson (Research Computing - IT Services) S.J.Thompson at bham.ac.uk
Wed Aug 26 13:23:36 BST 2015


Hmm mine seem to be working which I created this morning (on a client node):


mmdiag --lroc


=== mmdiag: lroc ===

LROC Device(s): '0A1E017755DD7808#/dev/sdb1;' status Running

Cache inodes 1 dirs 1 data 1  Config: maxFile 0 stubFile 0

Max capacity: 190732 MB, currently in use: 4582 MB

Statistics from: Tue Aug 25 14:54:52 2015


Total objects stored 4927 (4605 MB) recalled 81 (55 MB)

      objects failed to store 467 failed to recall 1 failed to inval 0

      objects queried 0 (0 MB) not found 0 = 0.00 %

      objects invalidated 548 (490 MB)


This was running 4.1.1-1.

Simon

From: <Oesterlin>, Robert <Robert.Oesterlin at nuance.com<mailto:Robert.Oesterlin at nuance.com>>
Reply-To: gpfsug main discussion list <gpfsug-discuss at gpfsug.org<mailto:gpfsug-discuss at gpfsug.org>>
Date: Wednesday, 26 August 2015 12:46
To: gpfsug main discussion list <gpfsug-discuss at gpfsug.org<mailto:gpfsug-discuss at gpfsug.org>>
Subject: Re: [gpfsug-discuss] Using HAWC (write cache)

Not directly related to HWAC, but I found a bug in 4.1.1 that results in LROC NSDs not being properly formatted (they don’t work) - Reference APAR IV76242 .

Still waiting for a fix.

Bob Oesterlin
Sr Storage Engineer, Nuance Communications
507-269-0413


From: <gpfsug-discuss-bounces at gpfsug.org<mailto:gpfsug-discuss-bounces at gpfsug.org>> on behalf of "Simon Thompson (Research Computing - IT Services)"
Reply-To: gpfsug main discussion list
Date: Wednesday, August 26, 2015 at 6:26 AM
To: gpfsug main discussion list
Subject: [gpfsug-discuss] Using HAWC (write cache)

Hi,

I was wondering if anyone knows how to configure HAWC which was added in
the 4.1.1 release (this is the hardened write cache)
(http://www-01.ibm.com/support/knowledgecenter/#!/STXKQY/411/com.ibm.spectr
um.scale.v4r11.adv.doc/bl1adv_hawc_using.htm)

In particular I'm interested in running it on my client systems which have
SSDs fitted for LROC, I was planning to use a small amount of the LROC SSD
for HAWC on our hypervisors as it buffers small IO writes, which sounds
like what we want for running VMs which are doing small IO updates to the
VM disk images stored on GPFS.


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://gpfsug.org/pipermail/gpfsug-discuss_gpfsug.org/attachments/20150826/346cea5c/attachment-0003.htm>


More information about the gpfsug-discuss mailing list