Currently i have a single optane p900 as a SLOG on a NFS share , connected to VMware. This is not a high disk IO load setup (as its my home lab), but i would like to have my SLOG as mirrored.
Can anyone offer any input on info on if i should buy another p900 as the 2nd part of the mirror, or if i should go with a p3700 as the 2nd mirror?
the answer would clearly be the p900 (as it has higher performance, and i would prefer mirror members to exactly match), however we all know that the p900 does not (exactly) have powerloss protection. (intel is vague on this, so i will assume it does NOT). The p3700 on the other hand, has slightly worse performance vs the p900, but DOES have PLP.
what do you guys think? (or is it a very bad idea to not use exact same devices as a mirror and thus my question is moot?)
thanks!
here are the current stats on the p900 in my x9 box (it is not assigned as a slog yet, in these test results)
with FreeNAS-11.2-U3:
and with FreeNAS-11.2-U5 (which im currently running, and will continue to run):
Can anyone offer any input on info on if i should buy another p900 as the 2nd part of the mirror, or if i should go with a p3700 as the 2nd mirror?
the answer would clearly be the p900 (as it has higher performance, and i would prefer mirror members to exactly match), however we all know that the p900 does not (exactly) have powerloss protection. (intel is vague on this, so i will assume it does NOT). The p3700 on the other hand, has slightly worse performance vs the p900, but DOES have PLP.
what do you guys think? (or is it a very bad idea to not use exact same devices as a mirror and thus my question is moot?)
thanks!
here are the current stats on the p900 in my x9 box (it is not assigned as a slog yet, in these test results)
with FreeNAS-11.2-U3:
Code:
Build FreeNAS-11.2-U3 Platform Intel(R) Xeon(R) CPU E5-2637 v2 @ 3.50GHz Memory 262067MB System Time Sun, 14 Jul 2019 03:11:51 -0500 Uptime 3:11AM up 32 days, 22:34, 5 users Load Average 0.25, 0.42, 0.43 Synchronous random writes: 0.5 kbytes: 19.1 usec/IO = 25.6 Mbytes/s 1 kbytes: 20.6 usec/IO = 47.3 Mbytes/s 2 kbytes: 20.1 usec/IO = 97.1 Mbytes/s 4 kbytes: 15.7 usec/IO = 249.2 Mbytes/s 8 kbytes: 19.4 usec/IO = 403.6 Mbytes/s 16 kbytes: 25.3 usec/IO = 618.7 Mbytes/s 32 kbytes: 38.0 usec/IO = 823.1 Mbytes/s 64 kbytes: 57.8 usec/IO = 1081.9 Mbytes/s 128 kbytes: 97.8 usec/IO = 1277.8 Mbytes/s 256 kbytes: 170.5 usec/IO = 1465.9 Mbytes/s 512 kbytes: 300.8 usec/IO = 1662.5 Mbytes/s 1024 kbytes: 561.1 usec/IO = 1782.1 Mbytes/s 2048 kbytes: 1084.0 usec/IO = 1844.9 Mbytes/s 4096 kbytes: 2114.6 usec/IO = 1891.6 Mbytes/s 8192 kbytes: 4177.8 usec/IO = 1914.9 Mbytes/s
and with FreeNAS-11.2-U5 (which im currently running, and will continue to run):
Code:
Hostname freenas.local Build FreeNAS-11.2-U5 Platform Intel(R) Xeon(R) CPU E5-2637 v2 @ 3.50GHz Memory 262067MB System Time Sun, 25 Aug 2019 15:40:19 -0500 Uptime 3:40PM up 1 day, 16:50, 4 users Load Average 1.35, 1.62, 1.59 root@freenas:/mnt # diskinfo -wS /dev/nvd0 /dev/nvd0 512 # sectorsize 280065171456 # mediasize in bytes (261G) 547002288 # mediasize in sectors 0 # stripesize 0 # stripeoffset INTEL SSDPED1D280GA # Disk descr. PHMB74220077280CGN # Disk ident. Yes # TRIM/UNMAP support 0 # Rotation rate in RPM Synchronous random writes: 0.5 kbytes: 18.4 usec/IO = 26.5 Mbytes/s 1 kbytes: 19.0 usec/IO = 51.4 Mbytes/s 2 kbytes: 19.9 usec/IO = 98.3 Mbytes/s 4 kbytes: 15.2 usec/IO = 257.5 Mbytes/s 8 kbytes: 18.6 usec/IO = 419.9 Mbytes/s 16 kbytes: 25.0 usec/IO = 625.3 Mbytes/s 32 kbytes: 36.4 usec/IO = 859.3 Mbytes/s 64 kbytes: 52.2 usec/IO = 1197.3 Mbytes/s 128 kbytes: 92.2 usec/IO = 1356.2 Mbytes/s 256 kbytes: 161.0 usec/IO = 1553.2 Mbytes/s 512 kbytes: 293.8 usec/IO = 1701.6 Mbytes/s 1024 kbytes: 558.3 usec/IO = 1791.0 Mbytes/s 2048 kbytes: 1073.4 usec/IO = 1863.2 Mbytes/s 4096 kbytes: 2124.3 usec/IO = 1883.0 Mbytes/s 8192 kbytes: 4233.9 usec/IO = 1889.5 Mbytes/s