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seen May 3 '13 at 8:52

Jul
19
awarded  Commentator
Jul
19
comment Native ZFS Configuration on Ubuntu
Ah, see here "zpool initially balks at this configuration because the two virtual devices have different redundancy schemes. This particular configuration is OK since both vdevs have some redundancy. In actual use, you should not mix redundant and nonredundant vdevs since there’s no way to predict which blocks might be stored on which devices; partial redundancy is useless. "
Jul
19
comment Native ZFS Configuration on Ubuntu
I just tried that and I got the following error: mismatched replication level: pool uses raidz and new vdev is mirror. Shouldn't the pool allow multiple vdevs of different types?
Jul
19
awarded  Scholar
Jul
19
awarded  Supporter
Jul
19
accepted Native ZFS Configuration on Ubuntu
Jul
19
comment Native ZFS Configuration on Ubuntu
@ShaneMadden that extra TB would likely mean a good deal more time until I have to upgrade, it's kind of worth it to me. This is mostly a seldom-write, often read scenario.
Jul
19
comment Native ZFS Configuration on Ubuntu
That makes sense. Two things: 1. If the second command were zpool add tank1 mirror /dev/sde2 /dev/sdf2 would we have one zpool with two different vdevs in it? 2. With Linux, I read that one should use /dev/disk/by-id handles instead of /dev/sd* handles. Partitions on the disks should show up as handles in /dev/disk/by-id/, right?
Jul
19
comment Native ZFS Configuration on Ubuntu
@StefanLasiewski I remember reading on Wikipedia that using multiple vdevs in a pool allows for more than one synchronous write. Also, wouldn't there be faster random reads from the partitions in the mirrored zpool than from those partitions if they were in a RAIDZ?
Jul
19
comment Native ZFS Configuration on Ubuntu
The commands are the same, but I'm confused on how to make the partitions, as all of these OSs have different partitioning tools. What flags should I set, should I set an initial filesystem on them, etc.
Jul
19
comment Native ZFS Configuration on Ubuntu
I used to use OpenSolaris for precisely that reason, but this project is quite mature now: zfsonlinux.org . Of course it can't SHIP with the kernel, but that doesn't mean it can be installed as an add-on kernel module.
Jul
19
asked Native ZFS Configuration on Ubuntu
Nov
23
awarded  Nice Question
Aug
30
comment 96 GB RAM on a Dell T7500 showing up as 78GB in Ubuntu Server 11.04
Hmm, there's nothing really plugged into it to remove. This is a brand new motherboard, too. Is it possible that the low-end AMD graphics card it shipped with somehow reserved 16 gigs of RAM for itself?
Aug
29
comment 96 GB RAM on a Dell T7500 showing up as 78GB in Ubuntu Server 11.04
also, Dell was more than happy to sell the same machine with a 12*16GB configuration, so I don't think the BIOS would be crapping out.
Aug
29
comment 96 GB RAM on a Dell T7500 showing up as 78GB in Ubuntu Server 11.04
and the dmidecode: pastebin.com/axGdhXvq
Aug
29
comment 96 GB RAM on a Dell T7500 showing up as 78GB in Ubuntu Server 11.04
cat /var/log/dmesg | grep Memory [ 0.000000] Memory: 82641428k/84672512k available (5510k kernel code, 788924k absent, 1242160k reserved, 3122k data, 812k init)
Aug
29
awarded  Student
Aug
29
asked 96 GB RAM on a Dell T7500 showing up as 78GB in Ubuntu Server 11.04