Re: [gpfsug-discuss] Tiers

Thu, 15 Dec 2016 12:52:47 -0800

Hi
 
I see Kevin's setup regularly. With or without tape depending on the religious believes of the client.

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----- Original message -----
From: "Buterbaugh, Kevin L" <[email protected]>
Sent by: [email protected]
To: gpfsug main discussion list <[email protected]>
Cc:
Subject: Re: [gpfsug-discuss] Tiers
Date: Thu, Dec 15, 2016 10:47 PM
 
Hi Mark,
 
We’re a “traditional” university HPC center with a very untraditional policy on our scratch filesystem … we don’t purge it and we sell quota there.  Ultimately, a lot of that disk space is taken up by stuff that, let’s just say, isn’t exactly in active use.
 
So what we’ve done, for example, is buy a 60-bay storage array and stuff it with 8 TB drives.  It wouldn’t offer good enough performance for actively used files, but we use GPFS policies to migrate files to the “capacity” pool based on file atime.  So we have 3 pools:
 
1.  the system pool with metadata only (on SSDs)
2.  the data pool, which is where actively used files are stored and which offers decent performance
3.  the capacity pool, for data which hasn’t been accessed “recently”, and which is on slower storage
 
I would imagine others do similar things.  HTHAL…
 
Kevin
 
On Dec 15, 2016, at 2:32 PM, [email protected] wrote:
 
Just curious how many of you out there deploy SS with various tiers?  It seems like a lot are doing the system pool with SSD’s but do you routinely have clusters that have more than system pool and one more tier?  
 
I know if you are doing Archive in connection that’s an obvious choice for another tier but I’m struggling with knowing why someone needs more than two tiers really.
 
I’ve read all the fine manuals as to how to do such a thing and some of the marketing as to maybe why.  I’m still scratching my head on this though.  In fact, my understanding is in the ESS there isn’t any different pools (tiers) as it’s all NL-SAS or SSD (DF150, etc). 
 
It does make sense to me know with TCT and I could create an ILM policy to get some of my data into the cloud.
 
But in the real world I would like to know what yall do in this regard.
 
 
Thanks
 
Mark 
 

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