Re: [zfs-discuss] need hint on pool setup

2012-02-01 Thread Thomas Nau
Bob, On 01/31/2012 09:54 PM, Bob Friesenhahn wrote: On Tue, 31 Jan 2012, Thomas Nau wrote: Dear all We have two JBODs with 20 or 21 drives available per JBOD hooked up to a server. We are considering the following setups: RAIDZ2 made of 4 drives RAIDZ2 made of 6 drives The first

Re: [zfs-discuss] need hint on pool setup

2012-02-01 Thread Hung-Sheng Tsao (laoTsao)
my 2c 1 just do mirror of 2 dev with 20 hdd with 1 spare 2 raidz2 with 5 dev for 20 hdd, with one spare Sent from my iPad On Feb 1, 2012, at 3:49, Thomas Nau thomas@uni-ulm.de wrote: Hi On 01/31/2012 10:05 PM, Hung-Sheng Tsao (Lao Tsao 老曹) Ph.D. wrote: what is your main

[zfs-discuss] need hint on pool setup

2012-01-31 Thread Thomas Nau
Dear all We have two JBODs with 20 or 21 drives available per JBOD hooked up to a server. We are considering the following setups: RAIDZ2 made of 4 drives RAIDZ2 made of 6 drives The first option wastes more disk space but can survive a JBOD failure whereas the second is more space effective but

Re: [zfs-discuss] need hint on pool setup

2012-01-31 Thread Bob Friesenhahn
On Tue, 31 Jan 2012, Thomas Nau wrote: Dear all We have two JBODs with 20 or 21 drives available per JBOD hooked up to a server. We are considering the following setups: RAIDZ2 made of 4 drives RAIDZ2 made of 6 drives The first option wastes more disk space but can survive a JBOD failure

Re: [zfs-discuss] need hint on pool setup

2012-01-31 Thread Hung-Sheng Tsao (Lao Tsao 老曹) Ph.D.
what is your main application for ZFS? e.g. just NFS or iSCSI for home dir or VM? or Window client? Is performance important? or space is more important? what is the memory of your server? do you want to use ZIL or L2ARC? what is your backup or DR plan? You need to answer all these question