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 [email protected] - 804-828-4807 Don't be a phishing victim - VCU and other reputable organizations will never use email to request that you reply with your password, social security number or confidential personal information. For more details visit http://infosecurity.vcu.edu/phishing.html
From: molin gregory <[email protected]> To: [email protected] 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" <[email protected]> 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 [[email protected]] de la part de Zoltan Forray/AC/VCU [[email protected]] Date d'envoi : jeudi 17 février 2011 19:15 À : [email protected] 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 [email protected] - 804-828-4807 Don't be a phishing victim - VCU and other reputable organizations will never use email to request that you reply with your password, social security number or confidential personal information. For more details visit http://infosecurity.vcu.edu/phishing.html "ATTENTION. Ce message et les pièces jointes sont confidentiels et établis à l'attention exclusive de leur destinataire (aux adresses spécifiques auxquelles il a été adressé). Si vous n'êtes pas le destinataire de ce message, vous devez immédiatement en avertir l'expéditeur et supprimer ce message et les pièces jointes de votre système. This message and any attachments are confidential and intended to be received only by the addressee. If you are not the intended recipient, please notify immediately the sender by reply and delete the message and any attachments from your system. "
