usao
Occasional Visitor
Im looking to build a 100Tb iscsi nas/san at home using the newer ST8000NM0075 drives.
These drives are SAS 7200RPM drives and are 8Tb in size.
Im trying to figure an optimal solution which will save money but still be performant.
A single 8 drive configuration will be about 50Tb in Raid-5, but I think the performance of the Raid-5 will be higher than a 1GBE connection can support, but I don't think it will be fast enough to support a 10GBe connection either.
So, im wondering if it would be better to use 4 iSCSI arrays, each with 4 drives in a 3+1 configuration, and each using a 1GBe port? That should yeild around 4GByte/sec throughput, although it would be a bit less space due to extra raid overhead of 4x Raid5 instead of 2x Raid5 needed in a 7+1 config.
I would like to get the higher throughput and get at least 4GByte/sec if possible to the host using a combination of NAS arrays ,but need to keep costs down as much as possible due to this being a personal expense.
I originally tried this using a EMC CX4 and HPDL380 configuration, but got poor performance:
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util
dm-12 0.00 0.00 4510.40 5136.40 281.90 321.02 128.00 1751.40 181.91 0.10 100.08
Ideally, I would like to get about 10x the throughput to the host.
Looking for suggestions/ideas.
These drives are SAS 7200RPM drives and are 8Tb in size.
Im trying to figure an optimal solution which will save money but still be performant.
A single 8 drive configuration will be about 50Tb in Raid-5, but I think the performance of the Raid-5 will be higher than a 1GBE connection can support, but I don't think it will be fast enough to support a 10GBe connection either.
So, im wondering if it would be better to use 4 iSCSI arrays, each with 4 drives in a 3+1 configuration, and each using a 1GBe port? That should yeild around 4GByte/sec throughput, although it would be a bit less space due to extra raid overhead of 4x Raid5 instead of 2x Raid5 needed in a 7+1 config.
I would like to get the higher throughput and get at least 4GByte/sec if possible to the host using a combination of NAS arrays ,but need to keep costs down as much as possible due to this being a personal expense.
I originally tried this using a EMC CX4 and HPDL380 configuration, but got poor performance:
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util
dm-12 0.00 0.00 4510.40 5136.40 281.90 321.02 128.00 1751.40 181.91 0.10 100.08
Ideally, I would like to get about 10x the throughput to the host.
Looking for suggestions/ideas.