Re: [zfs-discuss] Redundancy for /opt by raidz?
Dear Admin u said: choose a 3-disk RAID-1 or a 4-disk RAID10 set for tank over RAIDZ aWith a 3-disk mirror you'd have a disk left over to be hot spare for failure in either rpool or tank. why do u prefer raid1 with one spare rather than raidz? i heard raidz has better redundancy than raid 1 or 5?! doesnt raidz support failover when one of my disk crach? Regards[/i] A RAIDZ set would allow 1 disk failure before it becomes non-redundant and if a 2nd disk fails you would lose all data. RAIDZ is similar to RAID5 in that it only takes a double-disk failure to lose everything. Of course you could have RAIDZ2 which is akin to RAID6. A 3-disk mirror set with 2 disks failing you would still have data. You need to read more on RAID terminology. Twice in my career I have had 2 disks fail in a RAID5 set before a hot spare could be added and all data was lost. Perfect paranoia is perfect awareness. -- This message posted from opensolaris.org ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] Redundancy for /opt by raidz?
Dear Admin I have a server with 6 HDD,in fresh installation i select two disks for mirroring and create rpool and installing solaris10,but i need further space than default rpool`s file systems for installing my application. (for example mysql).so i decide create another pool (named tank) with 4 remaining disks in raidz mode.but my question here? can i install my application in new pool (tank) or should better install my application in its default location for example /opt or /usr then symlink its folder to this new pool? or better mount new pool to default /usr or /opt? i would be appreciated if u guide me about best solution in these situation. Regards On Tue, Dec 30, 2008 at 1:59 AM, Vincent Fox vincent_b_...@yahoo.comwrote: Seems a lot simpler to create a multi-way mirror. Then symlink your /opt/BIND or whatever off to new place. # zpool create opt-new mirror c3t40d0 c3t40d1 c3t40d2 c3t40d3 # zpool status pool: opt-new state: ONLINE scrub: none requested config: NAME STATE READ WRITE CKSUM opt-new ONLINE 0 0 0 mirror ONLINE 0 0 0 c3t40d0 ONLINE 0 0 0 c3t40d1 ONLINE 0 0 0 c3t40d2 ONLINE 0 0 0 c3t40d3 ONLINE 0 0 0 errors: No known data errors There is no problem with having more than 2 disks in a mirror. If you have an old system with a bunch of old disk I could see good reason to be this paranoid. -- This message posted from opensolaris.org ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] Redundancy for /opt by raidz?
div id=jive-html-wrapper-div Dear AdminbrI have a server with 6 HDD,in fresh installation i select two disks for mirroring and create rpool and installing solaris10,but i need further space than default rpool`s file systems for installing my application. (for example mysql).so i decide create another pool (named tank) with 4 remaining disks in raidz mode.but my question here?br can i install my application in new pool (tank) or should better install my application in its default location for example /opt or /usr then symlink its folder to this new pool? or better mount new pool to default /usr or /opt?br i would be appreciated if u guide me about best solution in these situation.brRegardsbrbrdiv If the install-point of the software defaults to /opt/mysql you could just as easily mount a new filesystem in tank mounted onto the point you need it. Example: zfs create -o mountpoint=/opt/mysql tank/mysql I don't see a distinction that MATTERS between these choices. Pick one. You ask as though you think there's some deep decision being made here when there isn't. I would personally choose a 3-disk RAID-1 or a 4-disk RAID10 set for tank over RAIDZ any day. Safety matters most to me these days not disk space. With a 3-disk mirror you'd have a disk left over to be hot spare for failure in either rpool or tank. If you put all 4 into a RAID-10 set you'd have better performance and more space with a bit less safety. Choose. -- This message posted from opensolaris.org ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] Redundancy for /opt by raidz?
Seems a lot simpler to create a multi-way mirror. Then symlink your /opt/BIND or whatever off to new place. # zpool create opt-new mirror c3t40d0 c3t40d1 c3t40d2 c3t40d3 # zpool status pool: opt-new state: ONLINE scrub: none requested config: NAME STATE READ WRITE CKSUM opt-new ONLINE 0 0 0 mirror ONLINE 0 0 0 c3t40d0 ONLINE 0 0 0 c3t40d1 ONLINE 0 0 0 c3t40d2 ONLINE 0 0 0 c3t40d3 ONLINE 0 0 0 errors: No known data errors There is no problem with having more than 2 disks in a mirror. If you have an old system with a bunch of old disk I could see good reason to be this paranoid. -- This message posted from opensolaris.org ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
[zfs-discuss] Redundancy for /opt by raidz?
Dear Admins My machine is ultra-sparc and has 6 H.D.D .I want to run an application server(Dns server),with perfect redundancy and data protection for my operating system and application files and folders. i install bind on /opt. so during solaris 10 installation i choose two disks for mirroring in zpool and making root file system.but i want to have raidz with 4 reamining disks and a file system like /opt to have safer protection for my application files and folders. but /opt exist in first zpool with two disks under /. what is the best plan for data protection in my server? both for my operating system and application software that install in /opt with 6 scsi hard disks? Regards ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
