And one thing to keep in mind when using ZFS: Forget about hardware RAID!
Matthias Von meinem iPhone gesendet Am 17.09.2012 um 19:53 schrieb Dan McDonald <[email protected]>: > Ooops, I needed to clarify something... > > On Mon, Sep 17, 2012 at 06:26:12PM +0100, Andrew Haycock wrote: > > <SNIP!> > >> When Dan explained his setup, he brought to my attention his 64GB root >> disk. Aha! I think, this is something I was considering, but then I >> come away thoroughly confused as I try to understand what his 52GB >> rpool is used for (and indeed, what is rpool?), wonder at the 4GB >> swap/dump (when using Linux I deliberately move the swap to a >> mechanical drive to reduce wear on the SSD) and became utterly >> perplexed as to how a 4GB ZIL qualifies as over-provisioned on an SSD >> (I thought that ZIL was a log device and therefore written to a lot, I >> had considered buying a Gigabyte i-RAM from the States to server this >> role). Also Dan, do you use an L2ARC at all, could an SSD be >> worthwhile for this? > > Okay, I made a mistake. 4GB isn't swap, just dump. > > ZFS has two abstractions: The pool, and the filesystem. > > A pool is comprised of one or more disk slices or one or more disks. Due to > the Illumos grub's inability to boot from EFI volumes, you must slice your > root disk into traditional Solaris/Illumos partitions. > > My root ZFS pool is the 52GB partition on my ssd: > > (1)# zpool status rpool > pool: rpool > <SNIP!> > config: > > NAME STATE READ WRITE CKSUM > rpool ONLINE 0 0 0 > c4t1d0s0 ONLINE 0 0 0 > > errors: No known data errors > (0)# > > My data pool ("tank") is comprised of two whole 2TB disks, plus the 4GB slice > of SSD for slog: > > (0)# zpool status tank > pool: tank > <SNIP!> > config: > > NAME STATE READ WRITE CKSUM > tank ONLINE 0 0 0 > mirror-0 ONLINE 0 0 0 > c3t1d0 ONLINE 0 0 0 > c5t3d0 ONLINE 0 0 0 > logs > c4t1d0s4 ONLINE 0 0 0 > > errors: No known data errors > (0)# > > On a pool is one or more filesystems. Let's look at rpool: > > (1)# zfs list -r rpool > NAME USED AVAIL REFER MOUNTPOINT > <edited for content...> > rpool 15.4G 35.3G 45K /rpool > rpool/ROOT 10.6G 35.3G 31K legacy > rpool/ROOT/oi_151a4 9.75M 35.3G 9.28G / > rpool/ROOT/oi_151a6 10.6G 35.3G 9.34G / > rpool/local 440M 35.3G 440M /usr/local > rpool/zones 2.40G 35.3G 35K /zones > rpool/zones/nexenta 714M 35.3G 33K /zones/nexenta > rpool/zones/nexenta/ROOT 714M 35.3G 31K legacy > rpool/zones/nexenta/ROOT/zbe 714M 35.3G 714M legacy > rpool/zones/router 995M 35.3G 33K /zones/router > rpool/zones/router/ROOT 995M 35.3G 31K legacy > rpool/zones/router/ROOT/zbe-5 797K 35.3G 984M legacy > rpool/zones/router/ROOT/zbe-6 994M 35.3G 984M legacy > rpool/zones/webserver 744M 35.3G 33K /zones/webserver > rpool/zones/webserver/ROOT 744M 35.3G 31K legacy > rpool/zones/webserver/ROOT/zbe-5 971K 35.3G 734M legacy > rpool/zones/webserver/ROOT/zbe-6 743M 35.3G 734M legacy > (0)# > > You create a filesystem on a pool, and then it gets mounted somewhere. > > ZIL is written to a lot, but given my 2TB disks are 5900 RPM disks, even a > stock SSD is faster. I personally do not use L2ARC, given most of my home > server's filesystem usages is for backups, and at-most 35Mbit/sec web > connections will be more network bound than disk-bound anyway (assuming no > less than 10ms packet RTT, which is generous at a minimum). > >> I did find the zones a little confusing too, but as I plan on setting >> up a virtual machine to practise on I'm sure I'll fathom things out >> soon enough. > > Zones are lighter-weight VMs. You can give a zone its own TCP/IP stack, > which is what I do. They share kernels with other zones. Setup and teardown > of a zone is much quicker than a full-blown VM. > > Hope this helps some more, > Dan > > > ------------------------------------------- > illumos-discuss > Archives: https://www.listbox.com/member/archive/182180/=now > RSS Feed: https://www.listbox.com/member/archive/rss/182180/21175670-15e8c2c3 > Modify Your Subscription: https://www.listbox.com/member/?&; > Powered by Listbox: http://www.listbox.com > ------------------------------------------- illumos-discuss Archives: https://www.listbox.com/member/archive/182180/=now RSS Feed: https://www.listbox.com/member/archive/rss/182180/21175430-2e6923be Modify Your Subscription: https://www.listbox.com/member/?member_id=21175430&id_secret=21175430-6a77cda4 Powered by Listbox: http://www.listbox.com
