Lizette,
Thank you, that an example I was looking for.
However another question came to my mind: why mixed SG?
Yes, I can put both SSD and "regular" volumes to one SG, but I can also
create two separate storage groups. Why mixed SG is better?
What are the pro's and con's?
Remarks:
1. Separate Storage Groups are IMHO the only solution for distinction of
SATA, FC10k, FC15k, etc. disks. Of course when you care about performance.
2. FAST VP and similar facilities makes the above mechanism not
applicable, unusable.
3. I don't know details, but z/OS 2.1 introduced some new "tiering"
facilities, I think it's kind of "FAST VP" at system level. It can be
interesting.
Regards
--
Radoslaw Skorupka
Lodz, Poland
W dniu 2014-03-06 15:42, Lizette Koehler pisze:
I currently have 2 VMAX 20Ks. I have a my SSD separated to specific pools.
I do have one mixed pool (SSD and Spinning). This is a response I got when
I posted this question:
If a Storage Group contains a mix of SSD and HDD volumes, to divert datasets
on HDD volumes, assign them a Storage Class with these attributes:
DIRECT MSR = 1
DIRECT BIAS = R
Do not specify any values for SEQUENTIAL MSR or
BIAS. *
To direct storage allocation away from SSD, specify a DataClass with:
DIRECT MSR = 10
DIRECT BIAS = R
In case of HSM restore, dataset will be allocated depending on its SMS
attributes
So, you can separate datasets in a mixed pool by creating classes in DATA
and STORAGE with FAST and SLOW attributes.
HTH
Lizette
-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[email protected]] On
Behalf Of R.S.
Sent: Thursday, March 06, 2014 7:33 AM
To: [email protected]
Subject: Re: SSD in DFSMS
W dniu 2014-03-06 15:19, Lizette Koehler pisze:
What hardware are you using SSD in?
IBM DS8???
EMC VMAX or DMX
HDS
If you have a VMAX 40K then the product FAST VP probably will replace
the need for you to tune the SSD in HSM.
If you have a DS8870 then Protect Tier or Fast Tier may replace the
need to manage the SSD.
The Hardware Storage Arrays are now taking over moving data that is
"hot" to faster devices without HSM or the user knowing it is occurring.
It's VMAX (first model), however my quesion was rather general, just to
learn.
I'm aware of FAST VP or similar features, but we're not using it.
--
Radoslaw Skorupka
Lodz, Poland
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