Re: [zfs-discuss] ZFS for write-only media?

2008-04-21 Thread Dana H. Myers
Bob Friesenhahn wrote: Are there any plans to support ZFS for write-only media such as optical storage? It seems that if mirroring or even zraid is used that ZFS would be a good basis for long term archival storage. I'm just going to assume that write-only here means write-once, read-many,

Re: [zfs-discuss] Replacing a drive using ZFS

2007-02-21 Thread Dana H. Myers
Matt Cohen wrote: We have a system with two drives in it, part UFS, part ZFS. It's a software mirrored system with slices 0,1,3 setup as small UFS slices, and slice 4 on each drive being the ZFS slice. One of the drives is failing and we need to replace it. I just want to make sure I

Re: [zfs-discuss] Re: ZFS or UFS - what to do?

2007-01-26 Thread Dana H. Myers
Ed Gould wrote: On Jan 26, 2007, at 12:13, Richard Elling wrote: On Fri, Jan 26, 2007 at 11:05:17AM -0800, Ed Gould wrote: A number that I've been quoting, albeit without a good reference, comes from Jim Gray, who has been around the data-management industry for longer than I have (and I've

Re: [zfs-discuss] Re: ZFS or UFS - what to do?

2007-01-26 Thread Dana H. Myers
Torrey McMahon wrote: Dana H. Myers wrote: Ed Gould wrote: On Jan 26, 2007, at 12:13, Richard Elling wrote: On Fri, Jan 26, 2007 at 11:05:17AM -0800, Ed Gould wrote: A number that I've been quoting, albeit without a good reference, comes from Jim Gray, who has been around

Re: [zfs-discuss] Can you turn on zfs compression when the fs is already populated?

2007-01-24 Thread Dana H. Myers
Neal Pollack wrote: I have an 800GB raidz2 zfs filesystem. It already has approx 142Gb of data. Can I simply turn on compression at this point, or do you need to start with compression at the creation time? As I understand it, you can turn compression on and off at will. Data will be written

Re: [zfs-discuss] How to reconfigure ZFS?

2007-01-18 Thread Dana H. Myers
Karen Chau wrote: How do you reconfigure ZFS on the server after an OS upgrade? I have a ZFS pool on a 6130 storge array. After upgrade the data on the storage array is still intact, but ZFS configuration is gone due to new OS. Do I use the same commands/procedure to recreate the zpool,

Re: [zfs-discuss] Re: Production ZFS Server Death (06/06)

2006-12-01 Thread Dana H. Myers
Chad Leigh -- Shire.Net LLC wrote: On Dec 1, 2006, at 9:50 AM, Al Hopper wrote: Followup: When you say you fixed the HW, I'm curious as to what you found and if this experience with ZFS convinced you that your trusted RAID H/W did, in fact, have issues? Do you think that it's likely

Re: [zfs-discuss] Re: Production ZFS Server Death (06/06)

2006-12-01 Thread Dana H. Myers
Chad Leigh -- Shire.Net LLC wrote: On Dec 1, 2006, at 4:34 PM, Dana H. Myers wrote: Chad Leigh -- Shire.Net LLC wrote: On Dec 1, 2006, at 9:50 AM, Al Hopper wrote: Followup: When you say you fixed the HW, I'm curious as to what you found and if this experience with ZFS convinced you

Re: [zfs-discuss] Re: Production ZFS Server Death (06/06)

2006-12-01 Thread Dana H. Myers
Chad Leigh -- Shire.Net LLC wrote: On Dec 2, 2006, at 12:06 AM, Ian Collins wrote: [...] I don't think that the issue here, it's more one of perceived data integrity. People who have been happily using a single RAID 5 are now finding that the array has been silently corrupting their data.

Re: [zfs-discuss] ZFS Inexpensive SATA Whitebox

2006-10-11 Thread Dana H. Myers
Al Hopper wrote: On Wed, 11 Oct 2006, Dana H. Myers wrote: Al Hopper wrote: Memory: DDR-400 - your choice but Kingston is always a safe bet. 2*512Mb sticks for a starter, cost effective, system. 4*512Mb for a good long term solution. Due to fan-out considerations, every BIOS I've seen

Re: [zfs-discuss] Re: zpool status panics server

2006-08-25 Thread Dana H. Myers
Neal Miskin wrote: Hi Robert When ZFS can't write to a pool then it panics system. Thanks for the info. I find this hard to understand though, the same wouldnt happen for VxVM or SVM. Is this a flaw with zfs? It is ZFS bug 6322646; a flaw. Dana

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 seconds.*

Re: [zfs-discuss] 15 minute fdsync problem and ZFS: Solved

2006-06-22 Thread Dana H. Myers
Darren J Moffat wrote: Bill Sommerfeld wrote: On Wed, 2006-06-21 at 14:15, Neil Perrin wrote: Of course we would need to stress the dangers of setting 'deferred'. What do you guys think? I can think of a use case for deferred: improving the efficiency of a large mega-transaction/batch job

Re: [zfs-discuss] ZFS questions

2006-06-20 Thread Dana H. Myers
Richard Elling wrote: Erik Trimble wrote: Oh, and the newest thing in the consumer market is called hybrid drives, which is a melding of a Flash drive with a Winchester drive. It's originally targetted at the laptop market - think a 1GB flash memory welded to a 40GB 2.5 hard drive in the

Re: [zfs-discuss] Re: nfsd threads hang in ZFS

2006-06-18 Thread Dana H. Myers
Robert Milkowski wrote: I issued svcadm disable nfs/server nfsd is still there with about 1300 threads (down from 2052). stack pointer for thread 3002f4bd300: 2a1084b7021 [ 02a1084b7021 cv_wait+0x40() ] 02a1084b70d1 exitlwps+0x11c(0, 20, 4202, 300116ec7e0, 10,

Re: [Fwd: Re: [zfs-discuss] Re: disk write cache, redux]

2006-06-16 Thread Dana H. Myers
Phil Brown wrote: Pawel Wojcik wrote: Only SATA drives that operate under SATA framework and SATA HBA drivers have this option available to them via format -e. That's because they are treated and controlled by the system as scsi drives. From your e-mail it appears that you are talking about

Re: [Fwd: Re: [zfs-discuss] Re: disk write cache, redux]

2006-06-16 Thread Dana H. Myers
Dana H. Myers wrote: Phil Brown wrote: Pawel Wojcik wrote: Only SATA drives that operate under SATA framework and SATA HBA drivers have this option available to them via format -e. That's because they are treated and controlled by the system as scsi drives. From your e-mail it appears