FAST Cache drives have to sustain much higher I/O compare to other FC drives, care must be taken to prevent bus bottleneck and contention:
- Spread FAST Cache drives over as many buses as possible.
- Follow RAID1 best practice when configuring FAST Cache (binding the Primary and Secondary for each RAID1 pair on different buses)- Avoid using a mixture of FAST Cache drives from vault enclosure (SPS Powered DAE or DPE) and other enclosure (non-SPS powered)
- Avoid adding more than 4 FAST Cache drives per bus (in CX4 series)
- Upgrade to FLARE R32 for VNX series
- Disable FAST Cache for LUNs no required, to reduce SP overhead
Please consider moving this question to the proper forum for maximum visibility. Questions written to the users' own "Discussions" space don't get the same amount of attention and questions can go unanswered for a long time (if at all). You can do so by selecting "Move" under ACTIONS along the right. Then search for and select: "Unified Storage" which would be the most relevant for this since this relates to both CLARiiON and VNX (block). There is also a recent post demonstrating the steps to do the same:
I see that you had found the answer on your own and have written up a nice summary. Not to take anything away from what you have, can I also suggest referring to:
emc251589: "FAST Cache configuration best practice"
Let's definitely get this posted to the proper forum for the benefit of others that may be looking for the same. Also, consider marking your question as "Answered" as that helps in the search. In addition, I believe you will get points even for marking your own question as such.
engkong
1 Rookie
•
11 Posts
0
June 30th, 2013 02:00
FAST Cache drives have to sustain much higher I/O compare to other FC drives, care must be taken to prevent bus bottleneck and contention:
- Spread FAST Cache drives over as many buses as possible.
- Follow RAID1 best practice when configuring FAST Cache (binding the Primary and Secondary for each RAID1 pair on different buses)- Avoid using a mixture of FAST Cache drives from vault enclosure (SPS Powered DAE or DPE) and other enclosure (non-SPS powered)
- Avoid adding more than 4 FAST Cache drives per bus (in CX4 series)
- Upgrade to FLARE R32 for VNX series
- Disable FAST Cache for LUNs no required, to reduce SP overhead
christopher_ime
4 Operator
•
2K Posts
0
July 4th, 2013 00:00
engkong,
Please consider moving this question to the proper forum for maximum visibility. Questions written to the users' own "Discussions" space don't get the same amount of attention and questions can go unanswered for a long time (if at all). You can do so by selecting "Move" under ACTIONS along the right. Then search for and select: "Unified Storage" which would be the most relevant for this since this relates to both CLARiiON and VNX (block). There is also a recent post demonstrating the steps to do the same:
EMC Community Network Frequently Asked Questions
I see that you had found the answer on your own and have written up a nice summary. Not to take anything away from what you have, can I also suggest referring to:
emc251589: "FAST Cache configuration best practice"
Let's definitely get this posted to the proper forum for the benefit of others that may be looking for the same. Also, consider marking your question as "Answered" as that helps in the search. In addition, I believe you will get points even for marking your own question as such.