Re: [Veritas-bu] Media Servers Per Tape Drive Ratio
Now I would be asking the opposite question, how many tape drives per media server, based on the guidance I’ve seen somewhere about how many MHz of CPU are required to drive a tape, and how many MHz are required to handle each Ethernet port over which the data arrives. There is a lot of wet finger as there is always a bottleneck somewhere, it is just very time consuming to chase them down. Our older sites use SSO a lot and it is a bad thing as it was overused – servers wait many many hours for drives to come free, and can even wait mid-backup when they change tapes; NetBackup not unreasonably tries not to use the drive that is unloading for the next tape, but that means that a server changing tapes just joins the queue at the back. Newer site there is no SSO; we have Sun T5220 media servers each with 4 x LTO4, 2 on each of 2 x 4Gb/s fibres. That is a theoretical bottleneck because if both drives are doing 2:1 compression we are over what a 4Gb/s fibre can do. We use disk staging to prevent the slow clients hogging drives, so all tape access is SLP duplications which run at at least 100MB/s. The media servers are also FT media, so what would have been SAN Media Servers (big RAC systems) are SAN clients. Much easier to manage, seems to run OK. Hopefully no shoe-shining. Doesn’t answer your question at all! If you really do want to use SSO then it comes down to seeing how many hours each media server needs a drive, seeing if you can create backup windows that are as wide as possible, and fitting the hours you need a drive into the hours in the backup window. Go above that and Status 196 will hurt you. William D L Brown This e-mail was sent by GlaxoSmithKline Services Unlimited (registered in England and Wales No. 1047315), which is a member of the GlaxoSmithKline group of companies. The registered address of GlaxoSmithKline Services Unlimited is 980 Great West Road, Brentford, Middlesex TW8 9GS. ___ Veritas-bu maillist - Veritas-bu@mailman.eng.auburn.edu http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
Re: [Veritas-bu] How Much Data Can Be Backed Up
I’d agree with Ben, all you can really do is measure the ‘tape hours free’ and say what % busy your overall environment is. You can I guess also see the total data moved in that backup window or 24 hour period, multiply the ‘% free’ by that and get an approximation at how much more data can be backed up with what you have. Now of course it only really works if your environment is totally homogenous, for example there is only one storage unit/storage unit group or SLP for all backups, and underlying it is one media server or a pool of media servers. All backups must be over the same speed of LAN….not many backup shops are like that. Otherwise you will calculate you have free capacity, but actually it is all on one SAN media server that does not 100% use its tape drives, and the users (curse them!) will add the extra data somewhere quite else. If you can move your architecture towards being able to load balance ‘everything’ it will make your life easier. Reporting tools like EMC DPA, OpsCenter Analytics etc can help you figure out where the capacity is and where the slowdowns are that can be addressed to sweat the assets more. William D L Brown This e-mail was sent by GlaxoSmithKline Services Unlimited (registered in England and Wales No. 1047315), which is a member of the GlaxoSmithKline group of companies. The registered address of GlaxoSmithKline Services Unlimited is 980 Great West Road, Brentford, Middlesex TW8 9GS. ___ Veritas-bu maillist - Veritas-bu@mailman.eng.auburn.edu http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
Re: [Veritas-bu] Size buffers / Performance Tune on Ex2k3 with LTO4
Just a quick question, but I used some default NetBackup settings to tune Exchange backups and restores. If I move to a different library with LTO4 (rather than LTO3), do I need to reconfigure the settings? Windows 2003 SAN Media Exchange, with Master Win2k3 SP2 Need? No, unless there were tape driver (not NetBackup) settings changes--which I haven't seen in years. For NBU, since the maximum transfer rate of the drive is now faster (and LTO4s vary transport speed to make up for slower transfer rates rather than stop/back up/resume when the host can't keep up), you may want to revisit the bptm logs to see if buffer tuning is indicated. ___ Veritas-bu maillist - Veritas-bu@mailman.eng.auburn.edu http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
Re: [Veritas-bu] Media Servers Per Tape Drive Ratio
How do you determine how many media servers per tape drive in your environments? I have 10 LTO3 tape drives and have been using 2 media servers per tape drive. Thank you. I read this question differently than others who responded. In case the question related to SSO, recent NetBackup versions (6.5 and higher IIRC) reduced the traffic among media servers sharing a drive, making it practical to have more media servers sharing more drives reliably. A dozen media servers sharing four LTO4s certainly works; I don't know what the practical maximum would be. Note: the more of your media servers that are Windows, the more problems you will have (RSM, HBA drivers, network comms for SSO, ...). ___ Veritas-bu maillist - Veritas-bu@mailman.eng.auburn.edu http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
[Veritas-bu] NetBackup Screencast Demonstration Video Series
Introducing the NetBackup Screencast Demonstration Video Series The NetBackup Screencast Demonstration Videos are a group of short videos designed to demonstrate specific functions and procedures within NetBackup. They have been produced by Symantec NetBackup Product Support to help you get the most out of your NetBackup environment. The initial focus of the NetBackup Screencast Demo Video series is the NetBackup Agent for Microsoft Exchange. Thirty-four videos have been produced detailing a variety of topics including: * How to configure various backup scenarios for Exchange within NetBackup (such as DAG backups, CCR backups, etc.) * How to perform various restore scenarios for Exchange within NetBackup (to RSGs, Alternate clients, etc.) * Special topics such as Exclude list usage * Troubleshooting NetBackup Exchange backup and restore issues To see the entire list of videos, please check out this TechNote: VIDEO: NetBackup Support Screencast Demo - list of available videos http://symantec.com/docs/HOWTO41825 We would appreciate any feedback you have on these videos - to do so submit article ratings using the Rate this Article feedback box included in the rightmost column of every article in our knowledge base. Thanks, Symantec NetBackup Support ___ Veritas-bu maillist - Veritas-bu@mailman.eng.auburn.edu http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
[Veritas-bu] tool for backup-windows
hello,looking for a tool to see the backup-windows of all policies/schedules in one "picture" / "excel-sheet" ...any ideas?thx in advancepete Neu: WEB.DE De-Mail - Einfach wie E-Mail, sicher wie ein Brief! Jetzt De-Mail-Adresse reservieren: https://produkte.web.de/go/demail02 ___ Veritas-bu maillist - Veritas-bu@mailman.eng.auburn.edu http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
Re: [Veritas-bu] tool for backup-windows
Hah yeah, me too. Blows my mind there still isn't a way to do this in the program. On 01/26/2011 02:13 PM, Peter Wuckel wrote: hello, looking for a tool to see the backup-windows of all policies/schedules in one picture / excel-sheet ... any ideas? thx in advance pete Neu: WEB.DE De-Mail - Einfach wie E-Mail, sicher wie ein Brief! Jetzt De-Mail-Adresse reservieren: *https://produkte.web.de/go/demail02* -- Nate SandersDigital Motorworks System Administrator (512) 692 - 1038 This message and any attachments are intended only for the use of the addressee and may contain information that is privileged and confidential. If the reader of the message is not the intended recipient or an authorized representative of the intended recipient, you are hereby notified that any dissemination of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by e-mail and delete the message and any attachments from your system. ___ Veritas-bu maillist - Veritas-bu@mailman.eng.auburn.edu http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
[Veritas-bu] Question about media server OS - Solaris on x86?
We are considering a new OS platform for our Netbackup media servers at $WORK. The current platform is Solaris on SPARC, the consideration is going to Solaris on x86. Is this a good idea? Is the conversion from Solaris SPARC to x86 more or less effort than a completely separate platform, say Redhat Linux? Thanks in advance, James ___ Veritas-bu maillist - Veritas-bu@mailman.eng.auburn.edu http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
Re: [Veritas-bu] Question about media server OS - Solaris on x86?
We 'engineered' - as in wrote the required internal docs - for Solaris x86 a few years back. We found no internal users wanting it. If their s/w was ported to x86 it was to Windows or Linux, not Solaris. We dropped support. BUT I read on this group of people who converted their RHEL media servers to Solaris x86 just to use ZFS and got a big performance boost compared to staging to EXT3. So it does depend on what you need. What I would say since Ora¢le took over is to check carefully the ¢ost. It is emphatically not the same as Sun according to others on the Sun Managers group. Another aspect is your in-house knowledge; we have a number of staff with many years Solaris knowledge and a few staff with a few years RHEL knowledge; that delta has a cost. You have to weigh these up. I would also be interested to see what others on this forum who are Sun SPARC users think about the future. William D L Brown This e-mail was sent by GlaxoSmithKline Services Unlimited (registered in England and Wales No. 1047315), which is a member of the GlaxoSmithKline group of companies. The registered address of GlaxoSmithKline Services Unlimited is 980 Great West Road, Brentford, Middlesex TW8 9GS. ___ Veritas-bu maillist - Veritas-bu@mailman.eng.auburn.edu http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
[Veritas-bu] Question re iSCSI tape library serverless iSCSI staging
Hello folks, I wonder if anybody has experience with iSCSI tape library in a similar setup as per below: The backup setup configured is D-2D-2T and the first 2D - backup Disk Storage Unit located on iSCSI SAN connected to backup server via iSCSI. By adding iSCSI enabled tape library, is it possible to configure NetBackup to do a serverless disk staging to tape via iSCSI? i.e. scheduled disk staging process from ISCSI SAN (disk STU) will move data directly to ISCSI Tape library WITHOUT sending data flow input/output through iSCSI network card on backup server, only metadata goes to backup server? If this configuration is possible, what type of license/feature may be required? Thanks all George +-- |This was sent by glav...@gmail.com via Backup Central. |Forward SPAM to ab...@backupcentral.com. +-- ___ Veritas-bu maillist - Veritas-bu@mailman.eng.auburn.edu http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
