<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">I believe this was discussed a while ago, but I was unable to find clear answers, so I’ll re-ask in hopefully a slightly different way.<div class=""><br class=""></div><div class="">On an OST, I have 30 drives, each at 7.6TB. I create 3 raidz2 zpools of 10 devices (ashift=12):</div><div class=""><br class=""></div><div class=""><div class=""><font face="Courier New" class="">[root@lustre47b ~]# zpool list</font></div><div class=""><font face="Courier New" class="">NAME SIZE ALLOC FREE CKPOINT EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT</font></div><div class=""><font face="Courier New" class="">oss55-0 69.9T 37.3M 69.9T - - 0% 0% 1.00x ONLINE -</font></div><div class=""><font face="Courier New" class="">oss55-1 69.9T 37.3M 69.9T - - 0% 0% 1.00x ONLINE -</font></div><div class=""><font face="Courier New" class="">oss55-2 69.9T 37.4M 69.9T - - 0% 0% 1.00x ONLINE -</font></div><div class=""><font face="Courier New" class="">[root@lustre47b ~]#</font></div></div><div class=""><br class=""></div><div class="">Running a mkfs.lustre against these (and the lustre mount) and I see:</div><div class=""><br class=""></div><div class=""><div class=""><font face="Courier New" class="">[root@lustre47b ~]# df -h | grep ost</font></div><div class=""><font face="Courier New" class="">oss55-0/ost165 52T 27M 52T 1% /lustre/ost165</font></div><div class=""><font face="Courier New" class="">oss55-1/ost166 52T 27M 52T 1% /lustre/ost166</font></div><div class=""><font face="Courier New" class="">oss55-2/ost167 52T 27M 52T 1% /lustre/ost167</font></div><div class=""><font face="Courier New" class="">[root@lustre47b ~]#</font></div></div><div class=""><br class=""></div><div class="">Basically, we’re seeing a pretty dramatic loss in capacity (156TB vs 209.7TB, so a loss of about 50TB). Is there any insight on where this capacity is disappearing to? If there some mkfs.lustre or zpool option I missed in creating this? Is something just reporting slightly off and that space really is there?</div><div class=""><br class=""></div><div class="">Thanks.</div><div class=""><br class=""><div class="">
<div style="color: rgb(0, 0, 0); letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div class="">—<br class=""></div><div class=""><br class=""></div><div class="">Makia Minich<br class=""></div><div class="">Chief Architect<br class=""></div><div class="">System Fabric Works<br class="">"Fabric Computing that Works”<br class=""><br class="">"Oh, I don't know. I think everything is just as it should be, y'know?”<br class="">- Frank Fairfield</div></div></div></div></div>
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