On Mon, Nov 23, 2009 at 1:09 PM, Tom Buskey <[email protected]> wrote:
> > > On Mon, Nov 23, 2009 at 10:31 AM, Alan Johnson <[email protected]> wrote: > I have a Ubuntu 9.10 box that boots a RAID6 with GRUB2. I expect that is > very new, eh? > > So your Ubuntu does software RAID6 on the boot disks with / and /boot? > Um, certainly /, but now that you mention it, I'm not 100% sure on /boot. I'm pretty sure it is on there as well, as I don't think I split it out on this machine, but since it is a critical point, let me get back to you. I have that box rolled back to 9.04 now because some video issues I had with 9.10. Since this is the machine I have hooked to my TV, video is kind of paramount. =) It used new drives for the 9.10 upgrade so I just need to swap them back in to see if anything is fixed yet. It could have been my mother board. It gets flaky when I max out the RAM at 4GB. I have since pull it back to 2GB when I was reminded of the issue after going back to 9.04. Anyway, I'm hoping to get to that over T-day break, so I'll confirm /boot as well and let you know. > > Or you have a hardware RAID card doing RAID6? > Linux/mdadm > I once replaced my 120 GB drives with 500 GB drives to increase the pool. > It didn't seem slow to me, but.. You'll have to google :-/ to get real > numbers. I suspect the speed is similar to RAID 5/6 rebuilds > Yes, I've heard that performance is really good while rebuilding and it is nice to have it confirmed. However, on a busy system, I expect the trade off is even longer rebuild times. > ZFS will work on top of ISCSI SAN drives. Or you can share out a partion > from a ZFS pool as an iSCSI target. > Now THAT sounds like the stuff! So, you can make and share ZFS partitions? Is that functionally similar to LVM partitions? I'm a bit confused. More below... > > > zpool create raidz mypool c0t0d0 c0t1d0 c0t2d0 # create a RAIDZ from 3 > disks > > # Create a home with 10GB, max, share it on NFS and compress the data as it > comes in > zfs create mypool/home > zfs set quota=10G mypool/home > zfs set compression=on mypool/home > zfs set sharenfs=on mypool/home > > # Another one, but put it on iscsi > zfs create mypool/iSC > zfs set quota=10G mypool/iSC > zfs set compression=on mypool/iSC > zfs set shareiscsi=on mypool/iSC > > They really got the CLI stuff right! > Nice! But then what does it look like to the client? Doesn't iSCSI appear like a block device that still needs a file system on top of it? Does the client need ZFS support? That's the rub if I want to boot Linux clients from it. NFS removes the need for ZFS on the client, but I am concerned about network overhead for some of our heavier needs. > >> I'm tempted to try Fuse+ZFS for our database servers, or even just to >> right to FreeBSD, but > > > I wouldn't touch *anything* FUSE for production work. Well, I've used > NTFS-3G because I had to. > Yeah, I keep trying to put it out of my head, but it keeps sneaking back in there. I know it is not what I want it to be, but I can't stop wanting it! > > Get VirtualBox and play with FreeBSD/FreeNAS/Solaris/OpenSolaris inside it. > I've got a blade chassis coming out of production after some upgrades in Q1. I can use for a lab, so I'm just going to hold off until then so I can get all the pieces of our production cloud going at once and see what breaks when I do nutty stuff to get ZFS in the mix.
_______________________________________________ gnhlug-discuss mailing list [email protected] http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
