Just adding in that with HAWC, you can also use a shared fast storage device (instead of a node local SSD). So, for example, if you already have your metadata stored in a shared SSD server, then you can just enable HAWC without any additional replication requirements.
Dean From: Sven Oehme <[email protected]> To: gpfsug main discussion list <[email protected]> Date: 11/05/2016 09:18 AM Subject: Re: [gpfsug-discuss] HAWC and LROC Sent by: [email protected] Yes and no :) While olaf is right, it needs two independent blockdevices, partitions are just fine. So one could have in fact have a 200g ssd as a boot device and partitions it lets say 30g os 20g hawc 150g lroc you have to keep in mind that lroc and hawc have 2 very different requirements on the 'device'. if you loose hawc, you loose one copy of critical data (that's why the log needs to be replicated), if you loose lroc, you only loose cached data stored somewhere else, so the recommendation is to use soemwhat reliable 'devices' for hawc, while for lroc it could be simple consumer grade ssd's. So if you use one for both, it should be reliable. Sven On Sat, Nov 5, 2016, 6:40 AM Olaf Weiser <[email protected]> wrote: You can use both -HAWC ,LROC- on the same node... but you need dedicated ,independent ,block devices ... In addition for hawc, you could consider replication and use 2 devices, even across 2 nodes. ... Gesendet von IBM Verse leslie elliott --- [gpfsug-discuss] HAWC and LROC --- Von: "leslie elliott" <[email protected]> An: "gpfsug main discussion list" <[email protected]> Datum: Sa. 05.11.2016 02:09 Betreff [gpfsug-discuss] HAWC and LROC : Hi I am curious if anyone has run these together on a client and whether it helped If we wanted to have these functions out at the client to optimise compute IO in a couple of special cases can both exist at the same time on the same nonvolatile hardware or do the two functions need independent devices and what would be the process to disestablish them on the clients as the requirement was satisfied thanks leslie _______________________________________________ gpfsug-discuss mailing list gpfsug-discuss at spectrumscale.org http://gpfsug.org/mailman/listinfo/gpfsug-discuss _______________________________________________ gpfsug-discuss mailing list gpfsug-discuss at spectrumscale.org http://gpfsug.org/mailman/listinfo/gpfsug-discuss
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