[zfs-discuss] Live resize/grow of iscsi shared ZVOL

[Martin Svensson]

I have created a zvol. My client computer (windows) has the volume connected 
fine.
But when I resize the zvol using:
zfs set volsize=20G pool/volumes/v1
.. it disconnects the client. Is this by design?
 
 
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Re: [zfs-discuss] ZFS configuration and performance questions.

[Martin Svensson]

I read this (http://blogs.sun.com/roch/entry/when_to_and_not_to) blog regarding 
when and when not to use raidz. There is an example of a plain striped 
configuration and a mirror configuration. (See below)

M refers to a 2-way mirror and S to a simple dynamic stripe.

Config  Blocks AvailableRandom FS Blocks /sec
    -
M  2 x (50)5000 GB  2 
S  1 x (100)   1 GB 2

Granted, the simple striped configuration is fast, and of course with no 
redundancy. But I don't understand how a mirrored configuration can perform as 
good when you sacrifice half of your disks for redundancy. Doesn't a mirror 
perform as one device? Can someone please clarify the example from the above, I 
think I am missing something?
 
 
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[zfs-discuss] ZFS configuration and performance questions.

[Martin Svensson]

Hello! I'm new to ZFS and have some configuration questions.

What's the difference, performance wise, in below configurations?
* In the first configuration, can I loose 1 disk? And, are the disks striped to 
gain performance, as they act as one vdev?

* In the second configuration, can I loose 2 disks (one per raidz group)? Since 
dynamic striping is done across vdevs, will this configuration have better 
performance then configuration 1?

[b]Configuration 1[/b]
 raidz
  - dev1
  - dev2
  - dev3
  - dev4
  - dev5
  - dev6
  - dev7
  - dev8
  - dev9
  - dev10

[b]Configuration 2[/b]
 raidz
  - dev1
  - dev2
  - dev3
  - dev4
  - dev5
 raidz
  - dev6
  - dev7
  - dev8
  - dev9
  - dev10
 
 
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