Actually, is there have tunable value for small files random read write? We are going to implement cluster file system on email cluster -----Original Message----- From: Stuart Andrews Sent: 29/05/2010, 5:11 AM To: Martin, Jonathan; veritas-vx@mailman.eng.auburn.edu Subject: Re: [Veritas-vx] Linux VxVM Setup
Martin Some things to look at - are the read_ahead VxFS tuning - this is optimised to sequential reads. Other VxFS tunables are here http://support.veritas.com/docs/344352 The usual one is max_direct_iosz for performance. Also you could vxtrace the volume plex subdisk operations while the backups are going on and / or vxdmpadm iostat the LUNs / paths in particular and also iostat -Cxn to see which layer the slow down is occurring at. Stuart ________________________________ From: veritas-vx-boun...@mailman.eng.auburn.edu [mailto:veritas-vx-boun...@mailman.eng.auburn.edu] On Behalf Of Martin, Jonathan Sent: Saturday, 29 May 2010 12:01 AM To: veritas-vx@mailman.eng.auburn.edu Subject: Re: [Veritas-vx] Linux VxVM Setup Thanks for the help. Your post and another emailed to me privately led me to find an issue with the multipath driver. I didn't notice this before, but there should not be an /dev/sdc. This was an alternate path to the same lun. I've got my volume configured, 1.5 TB of data restored and flashbackups are running. However, the speed isn't what I had hoped. The backup runs for about an hour at <1MB/sec, backing up what looks like metadata. After that, the speed ups to ~25MB/sec. If I backup the data directly off the lun with a standard policy I get a steady 30MB/sec. Are there any configuration settings or logs I can look through? Are there buffer settings I can toy with? There does not seem to be much in /etc/vx/log. We've had quite a bit of success in similar flashbackup scenarios with Windows file servers, and we're hoping to push past 30MB/sec on Linux too. Thanks, -Jonathan From: William Havey [mailto:bbha...@gmail.com] Sent: Wednesday, May 26, 2010 3:08 PM To: Martin, Jonathan Cc: veritas-vx@mailman.eng.auburn.edu Subject: Re: [Veritas-vx] Linux VxVM Setup Jonathan, Use fdisk to clear up the "error" state then initialize the disks. Bill On Wed, May 26, 2010 at 10:51 AM, Martin, Jonathan <jmart...@intersil.com> wrote: Greetings all, first time poster here, so please be gentle. I'm trying to run a POC for NetBackup Linux Flashbackup, but to do that I need a VxVM volume and VxFS partition. I've got a 6TB lun presented to a test RedHat 2.6 server as /dev/sdb. When I run vxdiskadm, option 1 to initialize the disk I get the following error. This disk device does not appear to be valid. The disk may not have a valid or usuable partition table, the special device file for the disk may be missing or invalid, or the device may be turned-off or detached from the system. This disk will be ignored. Output format: [Device_Name,Disk_Access_Name] [sdb,sdb] vxdisk list gives me the following output. DEVICE TYPE DISK GROUP STATUS sda auto:none - - online invalid sdb auto - - error sdc auto - - error I also tried running through the VxVM Admin guide and got the following: vxdisk init sdb VxVM vxdisk ERROR V-5-1-0 read of lvm header blocks for /dev/vx/rdmp/sdb failed VxVM vxdisk ERROR V-5-1-5433 Device sdb: init failed: Disk Ioctl failed My Symantec rep gave me some trial keys and free software, but I'm on my own for configuration. Can someone here throw me a bone? I've got to be doing something wrong. Thanks! -Jonathan _______________________________________________ Veritas-vx maillist - Veritas-vx@mailman.eng.auburn.edu http://mailman.eng.auburn.edu/mailman/listinfo/veritas-vx _______________________________________________ Veritas-vx maillist - Veritas-vx@mailman.eng.auburn.edu http://mailman.eng.auburn.edu/mailman/listinfo/veritas-vx
