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CIFS file locking problem
by Dave Atkin 16 Jun '00

16 Jun '00

We have a problem with file locking which occurs every few months. We have finally worked out at least part of what is happening. We have a Windows 95 system filestore exported as a read-only CIFS share. There are 1200 or so PCs which access this. Just occasionally when a user launches the Telnet client (Hummingbird) it complains that it can't access its keyboard mapping file. Once this starts to happen, it is the same for every PC. A unix user running as root can't read or do anything to this file either - it gets "permission denied". Yesterday when this happened we used (rc_toggle_basic) lock_dump -f to look at the locks, and we found that a PC appeared to have taken out an exclusive read lock on the file: ========00003a31:0006b48e \95APPLIB\york.hts state=GRANTED mode=Excl-denyA host=OFFICE1 When we found the PC called "office1", it was turned off. The user said it had hung up and she had switched it off. We managed to restore normal service by doing a "cifs terminate -t 0 office1". This raises several issues: 1) If a CIFS client is switched off, is there any sort of keepalive timer on the Filer that closes down open files and locks? 2) Should a PC with read-only access to a filestore be allowed to lock files for exclusive read? Should this perhaps be an option on a qtree or share? 3) This particular application obviously doesn't expect this file to be shared. But could any malicious user take out locks on random important files and freeze the whole network? Dave Atkin -- Dave Atkin, Head of Technical Services Computing Service, University of York, YORK YO10 5DD Phone: +44-1904-433804 (ddi) Fax: +44-1904-433740 Email: D.Atkin(a)york.ac.uk

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RE: Raid Groups and Volumes
by Deborah.Rousseau＠netapp.com 16 Jun '00

16 Jun '00

Here's the scoop on volumes, raid groups, parity drives, hot spares, qtrees, and root: Volume, Raid Groups, Parity, Hot Spares-- ----------------------------------------- A volume by definition will contain one or more raid groups, just like a tray of ice can contain one or more cubes of ice. A raid group can contain a maximum of 28 disks (one parity disk and 27 data disks). The default number of drives in a raid group is 14; that number is considered optimum for performance vs. fault tolerance. (There is data regarding MTTDL (Mean time to data loss) and other performance and mean time measures that prove 14 disks to be the optimum size for raid group.) (NetApp 202 teaches diagnostics and optimization of performance and troubleshooting.) You can setup your 14 - 36Gb drives into one volume. But it would be better to use 13 disks in the raid group and save one disk on shelf as your hot spare. In case of failure, your filer will immediately begin to reconstruct your data to your hot spare. If you have AutoSupport turned on and configured, Network Appliance will be notified by your filer (by email) that a disk has failed and a new disk will be sent to you automatically per our service agreement. Yes, hot spares and AutoSupport are great to have working for you.) Qtrees, security styles, oplocks, quotas, backup-- -------------------------------------------------- You can organize your one (13 drive) volume into qtrees. Qtrees are almost like separate file system partitions. Each qtree can be setup with its own set of properties. To be specific, each qtree can have its own: - security styles (UNIX, MIXED, or NTFS) - oplocks settings (ON or OFF) - quotas for limiting users, groups or limiting the size of the qtree itself - backup and restore schedules Snapshots are volume wide; you cannot take a snapshot of an individual qtree; however, all qtrees will be included in the volume's snapshot. If you setup 2 volumes, you will have a minimum of 2 raid groups and therefore use 2 of your 14 - 36Gb drives as parity drives. Smaller raid groups give you greater protection against a double-disk failure, but slightly less than optimum performance and less storage space. Also, if you reserved one disk as hot spare, it would serve both volumes. Hot spares are global to the filer and can be used in a disk failure of any volume when there are multiple volumes on the filer.) Root-- ------ Some like to setup root as a separate 2-disk volume (parity and data disks). Having root separate helps with backup and disaster recovery and perhaps there are other considerations I don't know about. If root is a separate 2-disk volume, of your 14 disks you would have 2 parity, 1 hot spare and 11 data disks. If you have one volume with one raid group, you will have 12 data disks. There are several other considerations about qtrees, quotas, backup, disaster recovery, snapshots and hot spares to be understood. I would highly recommend NetApp 101 and 202 for comprehensive, hands-on training on fine points such as these. You can find training schedules as well as information on NetApp Certification at http://www.netapp.com/education/#training. Also, a great place to look up technical answers is NetApp's NOW site: http://now.netapp.com/. Best regards, Deborah Deborah Rousseau, MCSE, MCT Technical Trainer Network Appliance, Inc. http://now.netapp.com/ -----Original Message----- From: Brian Hostetter [mailto:BrianH@dice.com] Sent: Wednesday, June 14, 2000 8:53 AM To: toasters(a)mathworks.com Subject: Raid Groups and Volumes Hello, I just got my two new 760s with 2 shelves of 36G drives each. I am going through the setup and have a question on Volumes and Raid Groups. Can I create two shelves into one big raid group in order to take advantage of all the spindles, and then create two volumes on that raid group? Or do I have to create 2 raid groups (thus using an extra parity drive) and have 1 volume living on 1 raid group. --Brian _______________________________________________ Dl-toasters mailing list Dl-toasters(a)netapp.com http://mailhost.corp.netapp.com/mailman/listinfo/dl-toasters

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Removing vol0
by Brian Hostetter 15 Jun '00

15 Jun '00

I got two filers recently each configured a different way. They each contain two shelves. One had 2 drives used and the other marked spare, which was nice because I could config it any way I wanted. The other has all the drives setup into one 300G volume. Is it possible to pair a volume back down to just the two drives and create another volume? --Brian

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RE: Raid Groups and Volumes
by jeffrey.soto＠netapp.com 15 Jun '00

15 Jun '00

Brian, You can have a volume with one or more RAID groups, but not a RAID group with multiple volumes. Disks added to a volume will automatically be added to the first existing raid group until that raid group reaches it's maximum size. After the maximum number of disks per the RAID group "raidsize" is reached, a new raidgroup is automatically created with a parity disk. However, you can create logical partitions on the volume using qtrees. Raid size is set either at volume creation by ; vol create volname [ -r raidsize ] example: filer > vol create vol1 -r 14 or on an existing volume by vol options volname optname optval example: filer > vol options vol0 raidsize 21 ( sets the size of the raid size on existing raid group and subsequent ones for this volume ) >From the manual; The default number of disks in a RAID group (including the parity disk) is 14 ( 2 shelves). A RAID group must contain at least two disks. The largest RAID group size you can create manually is 28 disks. The maximum RAID group size is 52 disks. Using smaller RAID groups reduces disk reconstruction time if a disk fails. Using smaller (therefore, more) RAID groups provides higher reliability by reducing the risk of data loss due to multiple-disk failure. Conversely, configuring with larger (therefore, fewer) RAID groups in a filer uses fewer disks for parity, leaving more disks available for data storage. Jeff Soto SE NYC NetworkAppliance, Inc mailto:jsoto@netapp.com Mobile : 1-516-635-0668 CorpVM : 1-408-822-8567 Pager : 1-877-563-8277 eFax: 1-419-831-5019 -----Original Message----- From: Brian Hostetter [mailto:BrianH@dice.com] Sent: Wednesday, June 14, 2000 11:53 AM To: toasters(a)mathworks.com Subject: Raid Groups and Volumes Importance: High Hello, I just got my two new 760s with 2 shelves of 36G drives each. I am going through the setup and have a question on Volumes and Raid Groups. Can I create two shelves into one big raid group in order to take advantage of all the spindles, and then create two volumes on that raid group? Or do I have to create 2 raid groups (thus using an extra parity drive) and have 1 volume living on 1 raid group. --Brian _______________________________________________ Dl-toasters mailing list Dl-toasters(a)netapp.com http://mailhost.corp.netapp.com/mailman/listinfo/dl-toasters

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suscribe
by Michael Scala 15 Jun '00

15 Jun '00

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RE: Raid Groups and Volumes
by Dennis.Haag＠netapp.com 14 Jun '00

14 Jun '00

See System Administrator's Guide: page 72 Disk Concepts, page 80 Volume Concepts. Raid Groups are subsets of Volumes, not the other way around (for NetApp filers). You can use qtrees to effectively partition your volume if you need to rather than creating separate volumes. Dennis -----Original Message----- From: Brian Hostetter [mailto:BrianH@dice.com] Sent: Wednesday, June 14, 2000 8:53 AM To: toasters(a)mathworks.com Subject: Raid Groups and Volumes Hello, I just got my two new 760s with 2 shelves of 36G drives each. I am going through the setup and have a question on Volumes and Raid Groups. Can I create two shelves into one big raid group in order to take advantage of all the spindles, and then create two volumes on that raid group? Or do I have to create 2 raid groups (thus using an extra parity drive) and have 1 volume living on 1 raid group. --Brian _______________________________________________ Dl-toasters mailing list Dl-toasters(a)netapp.com http://mailhost.corp.netapp.com/mailman/listinfo/dl-toasters

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RE: Starting F720 from scratch
by Adam.Fox＠netapp.com 14 Jun '00

14 Jun '00

Definitely follow this up with a look at NOW, but here are the basic steps as I have done it in the past. 1. Boot to the 1-5 menu (use floppies or the floppy-boot? variable). 2. Select option 4. 3 After you are finished, get to a filer prompt and re-install the system files for the ONTAP version you wish to have on the new filer. 4. type download to download the boot image onto the disks. 5. reboot -- Adam Fox NetApp Professional Services, NC adamfox(a)netapp.com > -----Original Message----- > From: Henrique Pantarotto [mailto:henrique@corp.terra.com.br] > Sent: Wednesday, June 14, 2000 9:50 AM > To: toasters(a)mathworks.com > Subject: Starting F720 from scratch > > > Hello friends, > > I have a F720 that I need to "format" it.. ;-) What I mean > is that I need > to erase everything on it, and install it all over from scratch. > > What are the recommended steps to do that? Can anyone help me? >

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FW: Starting F720 from scratch
by Pam.Eaken＠netapp.com 14 Jun '00

14 Jun '00

Hi, It's in the Data ONTAP 5.3 SAG in the Troubleshooting chapter in the section titled, "How to initialize all disks and create a new file system." Pam Eaken Mgr. Tech Pubs Network Appliance -> -----Original Message----- > From: Henrique Pantarotto [mailto:henrique@corp.terra.com.br] > Sent: Wednesday, June 14, 2000 6:50 AM > To: toasters(a)mathworks.com > Subject: Starting F720 from scratch > > > Hello friends, > > I have a F720 that I need to "format" it.. ;-) What I mean is that I need > to erase everything on it, and install it all over from scratch. > > What are the recommended steps to do that? Can anyone help me? > > > Thanks!! > _______________________________________________ > Henrique Pantarotto > SysOp Site São Paulo > Terra Networks Brasil S/A > A Internet mais sua do que nunca > Tel: (11) 5505-5728 r.316/238 ICQ: 6934285 > henrique(a)corp.terra.com.br > > _______________________________________________ > Dl-toasters mailing list > Dl-toasters(a)netapp.com > http://mailhost.corp.netapp.com/mailman/listinfo/dl-toasters > _______________________________________________ > Dl-tpubs mailing list > Dl-tpubs(a)netapp.com > http://mailhost.corp.netapp.com/mailman/listinfo/dl-tpubs > _______________________________________________ Dl-tpubs mailing list Dl-tpubs(a)netapp.com http://mailhost.corp.netapp.com/mailman/listinfo/dl-tpubs

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Raid Groups and Volumes
by Brian Hostetter 14 Jun '00

14 Jun '00

Hello, I just got my two new 760s with 2 shelves of 36G drives each. I am going through the setup and have a question on Volumes and Raid Groups. Can I create two shelves into one big raid group in order to take advantage of all the spindles, and then create two volumes on that raid group? Or do I have to create 2 raid groups (thus using an extra parity drive) and have 1 volume living on 1 raid group. --Brian

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Re: Raid Groups and Volumes
by jmiddlebrooks＠datalink.com 14 Jun '00

14 Jun '00

You can have multiple raid groups within a volume but not multiple volumes within a raid group. Jason Middlebrooks Systems Engineer Datalink Corp. 888-933-9327 x2970 "Brian Hostetter" <BrianH(a)dice.com> To: toasters(a)mathworks.com Sent by: cc: owner-toasters@mat Subject: Raid Groups and Volumes hworks.com 06/14/2000 11:52 AM Hello, I just got my two new 760s with 2 shelves of 36G drives each. I am going through the setup and have a question on Volumes and Raid Groups. Can I create two shelves into one big raid group in order to take advantage of all the spindles, and then create two volumes on that raid group? Or do I have to create 2 raid groups (thus using an extra parity drive) and have 1 volume living on 1 raid group. --Brian

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