This is primarily for the disk LZ - backups come in (sequential and random
write) and are then migrated to tape (sequential and random read) plus
possible restores (sequential and random reads).
Zoltan Forray
TSM Software & Hardware Administrator
Virginia Commonwealth University
UCC/Office of Technology Services
zforray AT vcu DOT edu - 804-828-4807
Don't be a phishing victim - VCU and other reputable organizations will
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From:
molin gregory <gregory.molin AT AFNOR DOT ORG>
To:
ADSM-L AT VM.MARIST DOT EDU
Date:
02/21/2011 04:23 AM
Subject:
[ADSM-L] RE : [ADSM-L] How many disk volumes are too many?
Sent by:
"ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
Hello Zoltan,
First is to know if this volumes are for sequential or random access.
In our configuration, we have 3 100Go volumes for random access and more
than 500 volumes of 20Go for sequential access.
The first avantage off have many small volumes cause TSM using as many
volumes is want. (maximun mount point for the devclass)
The second, is to be able to reclaim very quickly such volumes. In our
case, we reclaim with a threshold=40.
Cordialement,
Regards,
Grégory
________________________________________
De : ADSM: Dist Stor Manager [ADSM-L AT VM.MARIST DOT EDU] de la part de Zoltan
Forray/AC/VCU [zforray AT VCU DOT EDU]
Date d'envoi : jeudi 17 février 2011 19:15
À : ADSM-L AT VM.MARIST DOT EDU
Objet : [ADSM-L] How many disk volumes are too many?
I am aware of the TSM design that says the more disk volumes you have, the
more it will spread out the I/O for better performance. I also realize a
lot of this doesn't really apply what with RAID-5, EMC SAN, multi-terabyte
storage, etc.
So, at what point does having lots of smaller volumes (for a disk LZ), not
give you any more benefit, I/O wise?
I have a 5.3TB SAN space on my new 6.2.2.0 server. Originally, I started
formatting 200GB volumes then moved to 300GB, up to 25-volumes.
Now I am adding another 5.3TB space and was wondering if I should continue
with 300GB or jump to 500GB?
Simultaneous sessions should not be an issue since most of these backups
are Domino TDP and therefore single thread. I don't think there is a peak
of more than 60-simultaneous sessions.
The TSM server is a Dell T710 with 48GB RAM and 15K internal disk for the
DB & Logs.
Your thoughts?
Zoltan Forray
TSM Software & Hardware Administrator
Virginia Commonwealth University
UCC/Office of Technology Services
zforray AT vcu DOT edu - 804-828-4807
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