I got my hands on an m550 128GB drive (for around $75 with the recent pre-Thanksgiving/pre-Christmas discounts).
Here are some comparisons between my old ZIL (the m500 128GB) and the new one:
| ZIL | Throughput (sustained) MB/s |
|---|---|
| none | 195.6 |
| m500 128GB | 124.0 |
| m550 128GB | 265.9 |
Here are some snippets of zpool isotat output:
No ZIL
|
1 |
2014-11-25 22:07:33,635 - 16777216000 bytes written in 85.77223777770996 seconds 195.60193874713124 MB/s |
|
1 2 3 4 5 6 7 8 9 10 |
pool alloc free read write read write ---------------------- ----- ----- ----- ----- ----- ----- tank 6.81T 1.07T 0 1.34K 0 171M raidz1 6.81T 1.07T 0 1.34K 0 171M gpt/TOSH-3TB-A - - 0 689 0 85.5M gpt/TOSH-3TB-B - - 0 664 0 82.5M gpt/SGT-SATA-4TB-A - - 0 691 0 85.7M cache - - - - - - gpt/tank_cache0 174G 16.0M 10 4 159K 142K ---------------------- ----- ----- ----- ----- ----- ----- |
m500 128GB as ZIL
|
1 |
2014-11-25 22:04:18,505 - 16777216000 bytes written in 135.25676941871643 seconds 124.03975100175961 MB/s |
|
1 2 3 4 5 6 7 8 9 10 11 12 13 |
capacity operations bandwidth pool alloc free read write read write ---------------------- ----- ----- ----- ----- ----- ----- tank 6.80T 1.07T 0 2.93K 0 255M raidz1 6.80T 1.07T 0 1.09K 0 130M gpt/TOSH-3TB-A - - 0 545 0 65.3M gpt/TOSH-3TB-B - - 0 543 0 65.3M gpt/SGT-SATA-4TB-A - - 0 542 0 65.3M logs - - - - - - gpt/tank_log0 1.88G 29.9G 0 1.84K 0 125M cache - - - - - - gpt/tank_cache0 174G 0 0 636 0 78.8M ---------------------- ----- ----- ----- ----- ----- ----- |
m550 128GB as ZIL
|
1 |
2014-11-25 22:34:07,025 - 16777216000 bytes written in 63.09663510322571 seconds 265.89715873996414 MB/s |
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 |
capacity operations bandwidth pool alloc free read write read write ---------------------- ----- ----- ----- ----- ----- ----- tank 6.78T 1.09T 0 5.47K 0 467M raidz1 6.78T 1.09T 0 1.85K 0 221M gpt/TOSH-3TB-A - - 0 916 0 109M gpt/TOSH-3TB-B - - 0 913 0 108M gpt/SGT-SATA-4TB-A - - 0 930 0 111M logs - - - - - - gpt/tank_log0 2.19G 29.6G 0 3.62K 0 246M cache - - - - - - gpt/tank_cache0 2.09G 172G 0 645 0 79.8M ---------------------- ----- ----- ----- ----- ----- ----- capacity operations bandwidth pool alloc free read write read write ---------------------- ----- ----- ----- ----- ----- ----- tank 6.80T 1.08T 0 6.58K 0 564M raidz1 6.80T 1.08T 0 2.25K 0 270M gpt/TOSH-3TB-A - - 0 1.09K 0 134M gpt/TOSH-3TB-B - - 0 1.11K 0 136M gpt/SGT-SATA-4TB-A - - 0 1.08K 0 133M logs - - - - - - gpt/tank_log0 2.19G 29.6G 0 4.33K 0 294M cache - - - - - - gpt/tank_cache0 4.88G 170G 0 633 0 78.2M ---------------------- ----- ----- ----- ----- ----- ----- |
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