Re: [zfs-discuss] Re: Transactional RAID-Z?

2006-07-11 Thread Bill Moore
On Tue, Jul 11, 2006 at 11:03:17PM -0400, David Abrahams wrote: > How can RAID-Z preserve transactional semantics when a single > FS block write requires writing to multiple physical devices? ZFS uses a technique that's been used in databases for years: phase trees. First you write all

[zfs-discuss] Re: Transactional RAID-Z?

2006-07-11 Thread David Abrahams
Robert Milkowski <[EMAIL PROTECTED]> writes: > Hello David, > > Tuesday, July 11, 2006, 8:34:10 PM, you wrote: > > DA> Hi, > > DA> I've been trying to understand how transactional writes work in > DA> RAID-Z. I think I understand the ZFS system for transactional writes > DA> in general (the only

Re: [zfs-discuss] long time to schedule commands

2006-07-11 Thread eric kustarz
Sean Meighan wrote: i made sure path is clean, i also qualified the paths. time varies from 0.5 seconds to 15 seconds. If i just do a "timex pwd", it always seems to be fast. We are using csh. Here's a simple dscript to figure out how long each syscall is taking: #!/usr/sbin/dtrace -FCs s

Re: [zfs-discuss] Transactional RAID-Z?

2006-07-11 Thread Robert Milkowski
Hello David, Tuesday, July 11, 2006, 8:34:10 PM, you wrote: DA> Hi, DA> I've been trying to understand how transactional writes work in DA> RAID-Z. I think I understand the ZFS system for transactional writes DA> in general (the only place I could find that info was wikipedia; DA> someone shoul

Re: [zfs-discuss] Re: Thumper on (next) Tuesday?

2006-07-11 Thread Rob Logan
> Well, glue a beard on me and call me Nostradamus : http://www.sun.com/servers/x64/x4500/arch-wp.pdf http://www.cooldrives.com/8-channel-8-port-sata-pci-card.html ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mail

[zfs-discuss] Transactional RAID-Z?

2006-07-11 Thread David Abrahams
Hi, I've been trying to understand how transactional writes work in RAID-Z. I think I understand the ZFS system for transactional writes in general (the only place I could find that info was wikipedia; someone should fix that!). For RAID-Z it seems to me that the only way to make it transaction

Re: [zfs-discuss] long time to schedule commands

2006-07-11 Thread Sean Meighan
i made sure path is clean, i also qualified the paths. time varies from 0.5 seconds to 15 seconds. If i just do a "timex pwd", it always seems to be fast. We are using csh. itsm-mpk-2% env HOME=/app/canary PATH=/usr/bin:/usr/local/bin:/usr/sbin LOGNAME=canary HZ=100 TERM=xterm TZ=US/Pacific SH

Re: [zfs-discuss] ZFS needs a viable backup mechanism

2006-07-11 Thread Dale Ghent
On Jul 9, 2006, at 12:42 PM, Richard Elling wrote: Ok, so I only managed data centers for 10 years. I can count on 2 fingers the times this was useful to me. It is becoming less useful over time unless your recovery disk is exactly identical to the lost disk. This may sound easy, but it isn'

Re: [zfs-discuss] long time to schedule commands

2006-07-11 Thread Dana H. Myers
Richard Elling wrote: > Michael Schuster - Sun Microsystems wrote: >> Sean Meighan wrote: >>> I am not sure if this is ZFS, Niagara or something else issue? Does >>> someone know why commands have the latency shown below? >>> >>> *1) do a ls of a directory. 6.9 seconds total, truss only shows .07

Re: [zfs-discuss] long time to schedule commands

2006-07-11 Thread Richard Elling
Michael Schuster - Sun Microsystems wrote: Sean Meighan wrote: I am not sure if this is ZFS, Niagara or something else issue? Does someone know why commands have the latency shown below? *1) do a ls of a directory. 6.9 seconds total, truss only shows .07 seconds.* [...] this may be an is

[zfs-discuss] Re: Thumper on (next) Tuesday?

2006-07-11 Thread Dick Davies
Well, glue a beard on me and call me Nostradamus : http://blogs.sun.com/roller/page/jonathan?entry=the_rise_of_the_general On 03/07/06, Dick Davies <[EMAIL PROTECTED]> wrote: With ZFS officially supported now, I'd say The Stars Are Right -- Rasputin :: Jack of All Trades - Master of Nuns

Re: [zfs-discuss] long time to schedule commands

2006-07-11 Thread Michael Schuster - Sun Microsystems
Sean Meighan wrote: I am not sure if this is ZFS, Niagara or something else issue? Does someone know why commands have the latency shown below? *1) do a ls of a directory. 6.9 seconds total, truss only shows .07 seconds.* [...] this may be an issue with your $PATH. Do you see the same beh