[zfs-discuss] zfs dynamic lun expansion

[ganesh]

Hi,
I had 2 luns in a zfs mirrored config.
I increased the size of both the luns by x gig and offlined/online the 
individual luns in the zpool, also tried an export/import of the zpool, but i 
am unable to see the increased sizewhat would i need to do to see the 
increased size?...or is it not possible yet?
 
 
This message posted from opensolaris.org
___
zfs-discuss mailing list
zfs-discuss@opensolaris.org
http://mail.opensolaris.org/mailman/listinfo/zfs-discuss

[zfs-discuss] Re: Re: Re: Re: ZFS consistency guarantee

[ganesh]

Thanks Darren, but the snapshot taken at 4 would be the snapshot on the storage 
and not on the host so the storage system wouldnt really have to bother about 
flushing the host FS or about consistency...which would be more a function of 
the host FS or app?.
 
 
This message posted from opensolaris.org
___
zfs-discuss mailing list
zfs-discuss@opensolaris.org
http://mail.opensolaris.org/mailman/listinfo/zfs-discuss

[zfs-discuss] Re: Resizing lun.

[ganesh]

Hi Eric,
Is zfs dynamic lun expansion possible now?.

thanks!
Ganes
 
 
This message posted from opensolaris.org
___
zfs-discuss mailing list
zfs-discuss@opensolaris.org
http://mail.opensolaris.org/mailman/listinfo/zfs-discuss

[zfs-discuss] Re: ZFS with expanding LUNs

[ganesh]

Did we ever  get a reply to this?,
As somebody mentioned, the generic answer was "use ZFS", but i never got to 
know how. I havent tried it myself but i was curious to know since i will be 
implementing ZFS shortly.
 
 
This message posted from opensolaris.org
___
zfs-discuss mailing list
zfs-discuss@opensolaris.org
http://mail.opensolaris.org/mailman/listinfo/zfs-discuss

[zfs-discuss] Re: Re: Re: Re: ZFS consistency guarantee

[ganesh]

Thanks Darren, so a sync should do the job for me in that case. How about 
locking the FS so that i dont miss any new writes further on?.
Anything similar to lockfs?.
 
 
This message posted from opensolaris.org
___
zfs-discuss mailing list
zfs-discuss@opensolaris.org
http://mail.opensolaris.org/mailman/listinfo/zfs-discuss

[zfs-discuss] Re: Re: Re: ZFS consistency guarantee

[ganesh]

Thanks Darren.
let me try to put this in points - 

1. ZFS atomic operation that commits data.
2. Writes come into the app.
3. The db put in hotbackup mode.
4. Snapshot taken on storage.
5. ZFS atomic operation that commits data.

So if i do a snap restore, ZFS might revert to point1, but from the db 
perspective, it is inconsistent and we would need to do a recovery..correct?.
Lets say between 3 and 4 i manually wanted to do what ZFS does in point 5, 
would just sync do the job here?. Taking a zfs snaphost might take a snap at 
point 1..which might not work from teh db perspective.

Am i getting this right?.

TIA
 
 
This message posted from opensolaris.org
___
zfs-discuss mailing list
zfs-discuss@opensolaris.org
http://mail.opensolaris.org/mailman/listinfo/zfs-discuss

[zfs-discuss] Re: ZFS consistency guarantee

[ganesh]

Both levels, application and filesystem.
If i put the database in hotbackup mode,then i will have to ensure that the 
filesystem is consistent as well.So, you are saying that taking a ZFS snapshot 
is the only method to guarantee consistency in the filesystem since it flushes 
all the buffers to the filesystem , so its consistent. 
Just curious,is there any manual way of telling ZFS to flush the buffers after 
queiscing the db other than taking a ZFS snapshot?.
 
 
This message posted from opensolaris.org
___
zfs-discuss mailing list
zfs-discuss@opensolaris.org
http://mail.opensolaris.org/mailman/listinfo/zfs-discuss

[zfs-discuss] ZFS consistency guarantee

[ganesh]

Hi Folks,
how can i guarantee consistency for the ZFS snapshots?.
If i am running a db or any other app on my ZFS and want to take a snapshot is 
there is any filesystem equivalent command to quiesce the ZFS before taking a 
snapshot or do i have to rely on the app itself?.
Can i do something like lockfs or the like?. If i take snapshost on the 
storage, how can i guarantee consistency on those snapshosts?. Any methods to 
quiesce the FS after which i can take snapshosts on storage?.

thanks for any inputs.
 
 
This message posted from opensolaris.org
___
zfs-discuss mailing list
zfs-discuss@opensolaris.org
http://mail.opensolaris.org/mailman/listinfo/zfs-discuss