ASM - Concept - Clarification Request

Hello All,
I'm about to go ahead and install ASM for one of my clients. After going through the book ASM - Under the hood, I have a few clarifications, which I hope can be answered by the experts here.
1- Since ASM uses its our algorithm for mirroring - Can I have an in-pair number of disks in +DATA diskgroup? say 11 disks ?
2- In regards to Failure Groups, what is concept? Say I have 1 diskgroup +DATA - 4 disks - does failure groups mean that id Disk 1 goes, then move the primary extents to another disk, say disk 3.
- Can failure groups be in different diskgroups, lets say failure group for DATA disks, would be disk in RECOVERY ?
- Or are failure groups additional disks which just sit there and are activated if case of a disk failure
3- On installation, ASM 10gR2, are there any things a firs timer should watch out for.
4- Should I have a hot spare disk on a 15 disk array Dell MD1000 - is this really necessary - why? if one disk goes bad, then we can simpy change it. Does this make sense if I have 4 hour gold-support on site with a new disk?
Thank in advance for any assistance.
Jan

1. Yes, ASM will determine the most suitable block mirroring strategy regardless the number of disks in the diskgroup.
2. Failure groups affect how ASM mirrors blocks across them. By default, each disk is in its own failure group - it is assumed that each disk can fail independently of others. If you assign two different disks to the same failure group, you indicate that they are likely to fail together (for example, if they share the access path and controller for that access path fails,) so ASM will only create single mirror on them and will try to create another mirror in another failure group. For example, you assign disk1 and disk2 to the same failure group: ASM will never create a mirror of a block from disk1 on disk2, it will only mirror to a different failure group. Note that if your storage is already RAIDed, EXTERNAL redundancy diskgroups are pretty safe: hardware RAIDs are usually more efficient than NORMAL redundancy ASM groups while maintaining the same level of protection, thanks to hardware acceleration and large caches they sport these days.
3. Not really, as long as you follow the documented procedures and have Oracle patched to the current patchset level. However, if you employ ASMLIB, there might be issues that differ by the storage vendor.
4. If you are sure that no other disk will fail within those 4 hours, hot spare is probably not that necessary. If availability is of concern, always plan for the worst case though. Having hot spare will protect you from such second failure while the replacement is en route.
Regards,
Vladimir M. Zakharychev

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Last edited by sweetthdevil (2015-03-21 13:33:08)

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