Re: [zfs-discuss] ZFS error while enabling DIRECT_IO for the DB chunks

2010-03-13 Thread Richard Elling
On Mar 12, 2010, at 6:31 AM, Bob Friesenhahn wrote: > On Thu, 11 Mar 2010, Kashif Mumtaz wrote: >> >> We are facing an issue while enabling DIRECT_IO for the DB chunks. >> >> The error message which appears in the online.log file is "Direct I/O cannot >> be used for the chunk file " >> >> Kind

Re: [zfs-discuss] How to manage scrub priority or defer scrub?

2010-03-13 Thread Richard Elling
On Mar 13, 2010, at 4:54 AM, Tonmaus wrote: > Dear zfs fellows, > > during a specific test I have got the impression that scrub may have quite an > impact on other I/O. CIFS throughput is down to 7 MB/s from 100 MB/s while > scrub on my main NAS. That is not a surprise as scrub of my raidz2 pool

Re: [zfs-discuss] When to Scrub..... ZFS That Is

2010-03-13 Thread Edward Ned Harvey
In addition to backups on tape, I like to backup my ZFS to removable hard disk. (Created a ZFS filesystem on removable disk, and "zfs send | zfs receive" onto the removable disk). But since a single hard disk is so prone to failure, I like to scrub my external disk regularly, just to verify the d

Re: [zfs-discuss] When to Scrub..... ZFS That Is

2010-03-13 Thread Andrew Gabriel
Thomas Burgess wrote: I scrub once a week. I think the general rule is: once a week for consumer grade drives once a month for enterprise grade drives. and before any planned operation which will reduce your redundancy/resilience, such as swapping out a disk for a new larger one when growin

Re: [zfs-discuss] When to Scrub..... ZFS That Is

2010-03-13 Thread Thomas Burgess
I scrub once a week. I think the general rule is: once a week for consumer grade drives once a month for enterprise grade drives. On Sat, Mar 13, 2010 at 3:29 PM, Tony MacDoodle wrote: > When would it be necessary to scrub a ZFS filesystem? > We have many "rpool", "datapool", and a NAS 7130,

[zfs-discuss] When to Scrub..... ZFS That Is

2010-03-13 Thread Tony MacDoodle
When would it be necessary to scrub a ZFS filesystem? We have many "rpool", "datapool", and a NAS 7130, would you consider to schedule monthly scrubs at off-peak hours or is it really necessary? Thanks ___ zfs-discuss mailing list zfs-discuss@opensolaris

[zfs-discuss] How to manage scrub priority or defer scrub?

2010-03-13 Thread Tonmaus
Dear zfs fellows, during a specific test I have got the impression that scrub may have quite an impact on other I/O. CIFS throughput is down to 7 MB/s from 100 MB/s while scrub on my main NAS. That is not a surprise as scrub of my raidz2 pool maxes out CPU on that machine. (1 Xeon L5410). I am