I've just started to experiment with iSCSI and am looking at creating one or more iSCSI-only pools, each with a single ZVOL device extent.
After reading these forums, I have some admittedly noob-ish questions:
1) With regards to the "50% rule" is it okay to create a single ZVOL that uses the entire pool but keep an eye on the usage so it doesn't exceed 50%?
2) Or is it better to create a ZVOL that's 50% of the total pool size?
3) If I do the #2 approach, does the ZVOL only use the first 50% of the pool's blocks (somewhat like a drive partition)? Or, to avoid fragmentation, can it use any blocks anywhere in the pool (as long as it doesn't occupy more than 50%)?
4) Does the "50% rule" also apply to SSDs? Or can I go higher?
5) Does NFS have similar fragmentation issues as iSCSI does?
Thanks!
After reading these forums, I have some admittedly noob-ish questions:
1) With regards to the "50% rule" is it okay to create a single ZVOL that uses the entire pool but keep an eye on the usage so it doesn't exceed 50%?
2) Or is it better to create a ZVOL that's 50% of the total pool size?
3) If I do the #2 approach, does the ZVOL only use the first 50% of the pool's blocks (somewhat like a drive partition)? Or, to avoid fragmentation, can it use any blocks anywhere in the pool (as long as it doesn't occupy more than 50%)?
4) Does the "50% rule" also apply to SSDs? Or can I go higher?
5) Does NFS have similar fragmentation issues as iSCSI does?
Thanks!