How are you measuring write speed?
________________________________ From: lustre-discuss <[email protected]> on behalf of Zeeshan Ali Shah <[email protected]> Sent: Tuesday, August 28, 2018 1:30:03 AM To: [email protected] Subject: [lustre-discuss] separate SSD only filesystem including HDD Dear All, I recently deployed 10PB+ Lustre solution which is working fine. Recently for genomic pipeline we acquired another racks with dedicated compute nodes with single 24-NVME SSD Servers/Rack . Each SSD server connected to Compute Node via 100 G Omnipath. Issue 1: is that when I combined SSDs in stripe mode using zfs we are not linearly scaling in terms of performance . for e..g single SSD write speed is 1.3GB/sec , adding 5 of those in stripe mode should give us atleast 1.3x5 or less , but we still get 1.3 GB out of those 5 SSD . Issue 2: if we resolve issue #1, 2nd challenge is to allow 24 NVMEs to compute nodes distributed and parallel wise , NFS not an option .. tried glusterfs but due to its DHT it is slow.. I am thinking to add another Filesystem to our existing MDT and install OSTs/OSS over the NVME server.. mounting this specific ssd where needed. so basically we will end up having two filesystem (one with normal 10PB+ and 2nd with SSD).. Does this sounds correct ? any other advice please .. /Zeeshan
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