As far as i know, there are not any 1TB FC drives. those are only SATA right now.
So if you need alot of space for data storage, go with the 1TB SATA disks. If you still need a lot of space but would like to get the better performance of FC, you can get 600G FC drives.
if you went with the 600G FC drives, you would need (6) 5 disk Raid 5 groups for a total usable space of 12.8TB. You would need a minimum of (2) DAE's but that wouldnt leave you any space to get extra disks for hotspares. If you have empty drive slots in other DAE's, you can then just get extra disks and put them in those slots instead of buying another DAE just to have slots for the hot spares.
Ok from using a capacity calculator, you would need:
12TB= (4) 5 disk Raid 5 groups for total of 14.6TB of usable space. That is a minimum of (2) DAE enclosures and (20) 1TB disks. Make sure you add a few extra for hot spares.
2TB= (2) 6 disk Raid 1/0 groups for a total of 2.4TB of usable space. That is a minimum of (1) DAE enclosures and (12) 450G FC disks. Also need hotspares.
The CX4-240 can have (16) DAE's attached so you should have plenty of space to grow.
There are currently 2TB SATA drives in the inventory. You may want to investigate the use of these.
Depending on the read/write mix of the workload, you may get better availability and equivalent performance by configuring RAID 6 8+2 with 1TB drives. In fact when configuring any RAID group with SATA drives, you should be aware of the workload's I/O characteristics to guarentee the appropriate response time through correct provisioning.
When provisioning FC drives for performance, remember, "the more spindles the better". A firm grasp on the required IOPS is needed before going with a RAID group composed of fewer large capacity FC drives over a RAID group made-up of many lower capacity FC drives.
I recommend you review Table 6, RAID Group User Capacity in the EMC CLARiiON Storage Systems Fundamentals for Performance and Availability. This table and the accompanying section are written to provide guidance in configuring RAID groups for capacity. In addition there is a discussion on the trade-offs of availability and performance of SATA versus FC drives and the different RAID levels in that paper. The Fundimentals paper is available on Powerlink.
kenn2347
3 Apprentice
•
542 Posts
0
June 1st, 2010 12:00
As far as i know, there are not any 1TB FC drives. those are only SATA right now.
So if you need alot of space for data storage, go with the 1TB SATA disks. If you still need a lot of space but would like to get the better performance of FC, you can get 600G FC drives.
if you went with the 600G FC drives, you would need (6) 5 disk Raid 5 groups for a total usable space of 12.8TB. You would need a minimum of (2) DAE's but that wouldnt leave you any space to get extra disks for hotspares. If you have empty drive slots in other DAE's, you can then just get extra disks and put them in those slots instead of buying another DAE just to have slots for the hot spares.
dynamox
9 Legend
•
20.4K Posts
1
June 1st, 2010 12:00
one note to add, you can't mix SATA and FC drives in the same enclosure.
bonnu06
2 Intern
•
258 Posts
0
June 1st, 2010 12:00
Kenn,
Thank you for your response. Fo the 1TB disks is it recommended to get FC drives or SATA drives to get high capacity.
kenn2347
3 Apprentice
•
542 Posts
0
June 1st, 2010 12:00
Ok from using a capacity calculator, you would need:
12TB= (4) 5 disk Raid 5 groups for total of 14.6TB of usable space. That is a minimum of (2) DAE enclosures and (20) 1TB disks. Make sure you add a few extra for hot spares.
2TB= (2) 6 disk Raid 1/0 groups for a total of 2.4TB of usable space. That is a minimum of (1) DAE enclosures and (12) 450G FC disks. Also need hotspares.
The CX4-240 can have (16) DAE's attached so you should have plenty of space to grow.
hope this helps
jps00
2 Intern
•
392 Posts
0
June 2nd, 2010 06:00
There are currently 2TB SATA drives in the inventory. You may want to investigate the use of these.
Depending on the read/write mix of the workload, you may get better availability and equivalent performance by configuring RAID 6 8+2 with 1TB drives. In fact when configuring any RAID group with SATA drives, you should be aware of the workload's I/O characteristics to guarentee the appropriate response time through correct provisioning.
When provisioning FC drives for performance, remember, "the more spindles the better". A firm grasp on the required IOPS is needed before going with a RAID group composed of fewer large capacity FC drives over a RAID group made-up of many lower capacity FC drives.
I recommend you review Table 6, RAID Group User Capacity in the EMC CLARiiON Storage Systems Fundamentals for Performance and Availability. This table and the accompanying section are written to provide guidance in configuring RAID groups for capacity. In addition there is a discussion on the trade-offs of availability and performance of SATA versus FC drives and the different RAID levels in that paper. The Fundimentals paper is available on Powerlink.