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Is PG using O_DIRECT or buffered read/write? Is it caching the pages in userspace?
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<div>Lustre will definitely keep pages consistent between clients, but if the application is caching the pages in userspace, and does not have any protocol between the nodes to invalidate cached pages when they are modified on disk, then the data will become
inconsistent when one node modifies it. </div>
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<div>That is the same reason it isn't possible to mount a single ext4 filesystem r/w on one node and r/o on another node with shared storage, because the filesystem doesn't expect data to be changing underneath it, and will cache pages in RAM and not re-read
them if they are modified on the other node. <br>
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<div id="AppleMailSignature">Cheers, Andreas</div>
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On Sep 29, 2018, at 07:57, $B2&N<(B <<a href="mailto:wanziforever@gmail.com">wanziforever@gmail.com</a>> wrote:<br>
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<span lang="EN-US">Hello, lustre development team</span></p>
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background: we have two postgresql instances running as a primary and standby and they share the same xlog file and data files (we change PG code to achieve this) which located in the mounted lustre file system, and we want to have a try with the lustre file
system, we used gfs2 before, and we expect the lustre will show a much better performance, but ...<br>
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<span lang="EN-US"><span></span></span></p>
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<span lang="EN-US"><span> </span></span></p>
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<span lang="EN-US">We meet a read/write concurrent access problem related with Lustre. Would you like to give us some suggestions? Any advices are appreciated, and thank you in advanced : )<span></span></span></p>
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<span lang="EN-US"><span>note: we are very sure the standy instance will not write any data to disk. (to be sure of this, we also shutdown the standby end, and use pg_xlogdump tool to read the xlog file, the problem still happened, and pg_xlogdump to is just
a query to with any write operation) <br>
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<span lang="EN-US">Scenario Description:<span></span></span></p>
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<span lang="EN-US">There</span>$B!G(B<span lang="EN-US">re 4 nodes(CentOS Linux release 7.4) connected with infiniband network(driven by MLNX_OFED_LINUX-4.4):<span></span></span></p>
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<span lang="EN-US">10.0.0.106 acts as MDS with a local PCI-E 800GB SSD that used as MDT.<span></span></span></p>
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<span lang="EN-US">10.0.0.101 acts as OSS with a same local PCI-E 800GB SSD that used as OST.<span></span></span></p>
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<span lang="EN-US">10.0.0.104 and 10.0.0.105 act as Lustre client and mount the Lustre file system at the directory of<span class="gmail-m_-4615751837339015999gmail-Apple-converted-space"> </span></span>$B!H(B<span lang="EN-US">/lustre</span>$B!I(B<span lang="EN-US">.<span></span></span></p>
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<span lang="EN-US">The Lustre related packages are compiled from official lustre-2.10.5-1.src.rpm.<span></span></span></p>
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<span lang="EN-US"><span> </span></span></p>
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<span lang="EN-US">The simplest verification(i.e. dd command) passed without errors.<span></span></span></p>
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<span lang="EN-US"><span> </span></span></p>
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<span lang="EN-US">Error:<span></span></span></p>
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<span lang="EN-US">Then start our customized PostgreSQL service at 104 and 105. 104 runs as the primary PostgreSQL server, and 105 runs as the secondary PostgreSQL server. All the two PostgreSQL nodes read/write the shared directory of<span class="gmail-m_-4615751837339015999gmail-Apple-converted-space"> </span></span>$B!H(B<span lang="EN-US">/lustre</span>$B!I(B<span lang="EN-US"><span class="gmail-m_-4615751837339015999gmail-Apple-converted-space"> </span>provided
by Lustre. The primary PostgreSQL server will open files with *<b>RW</b>* mode and write something into the files; at the *<b>meantime</b>* the second PostgreSQL server will open the same files with *<b>R</b>* mode and read the data written by the primary
PostgreSQL server, and it gets the *<b>wrong</b>* data (the flushed data by primary in disk is error i.e. write wrong data into disk). This will happen when we run a benchmark tool of PostgreSQL.<span></span></span></p>
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<span lang="EN-US"><span> </span></span></p>
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<span lang="EN-US"><span> </span></span></p>
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<span lang="EN-US">PS 1.<span></span></span></p>
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<span lang="EN-US">We tried different options to mount the Lustre:<span></span></span></p>
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<span lang="EN-US">mount -t lustre -o flock<span class="gmail-m_-4615751837339015999gmail-Apple-converted-space"> </span><a href="mailto:10.0.0.106@o2ib0:/birdfs" style="text-decoration:underline;color:rgb(149,79,114)" target="_blank">10.0.0.106@o2ib0:/birdfs</a><span class="gmail-m_-4615751837339015999gmail-Apple-converted-space"> </span>/lustre<span></span></span></p>
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<span lang="EN-US">mount -t lustre -o flock -o ro<span class="gmail-m_-4615751837339015999gmail-Apple-converted-space"> </span><a href="mailto:10.0.0.106@o2ib0:/birdfs" style="text-decoration:underline;color:rgb(149,79,114)" target="_blank">10.0.0.106@o2ib0:/birdfs</a><span class="gmail-m_-4615751837339015999gmail-Apple-converted-space"> </span>/lustre<span></span></span></p>
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<span lang="EN-US">but the error always exists.<span></span></span></p>
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<span lang="EN-US"><span> </span></span></p>
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<span lang="EN-US">PS 2.<span></span></span></p>
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<span lang="EN-US">Attach the initial information, maybe helpful.<span></span></span></p>
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<span lang="EN-US">[root@106 ~]# mkfs.lustre --fsname=birdfs --mgs --mdt --index=0 --reformat /dev/nvme0n1<span></span></span></p>
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<span lang="EN-US"><span> </span></span></p>
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<span lang="EN-US"> Permanent disk data:<span></span></span></p>
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<span lang="EN-US">Target: birdfs:MDT0000<span></span></span></p>
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<span lang="EN-US">Index: 0<span></span></span></p>
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<span lang="EN-US">Lustre FS: birdfs<span></span></span></p>
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<span lang="EN-US">Mount type: ldiskfs<span></span></span></p>
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<span lang="EN-US">Flags: 0x65<span></span></span></p>
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<span lang="EN-US"> (MDT MGS first_time update )<span></span></span></p>
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<span lang="EN-US">Persistent mount opts: user_xattr,errors=remount-ro<span></span></span></p>
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<span lang="EN-US">Parameters:<span></span></span></p>
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<span lang="EN-US"><span> </span></span></p>
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<span lang="EN-US">device size = 763097MB<span></span></span></p>
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<span lang="EN-US">formatting backing filesystem ldiskfs on /dev/nvme0n1<span></span></span></p>
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<span lang="EN-US"> target name birdfs:MDT0000<span></span></span></p>
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<span lang="EN-US"> 4k blocks 195353046<span></span></span></p>
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<span lang="EN-US"> options -J size=4096 -I 1024 -i 2560 -q -O dirdata,uninit_bg,^extents,dir_nlink,quota,huge_file,flex_bg -E lazy_journal_init -F<span></span></span></p>
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<span lang="EN-US">mkfs_cmd = mke2fs -j -b 4096 -L birdfs:MDT0000 -J size=4096 -I 1024 -i 2560 -q -O dirdata,uninit_bg,^extents,dir_nlink,quota,huge_file,flex_bg -E lazy_journal_init -F /dev/nvme0n1 195353046<span></span></span></p>
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<span lang="EN-US"><span> </span></span></p>
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<span lang="EN-US">Writing CONFIGS/mountdata<span></span></span></p>
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<span lang="EN-US"><span> </span></span></p>
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<span lang="EN-US">[root@101 ~]# mkfs.lustre --fsname=birdfs --ost --reformat --index=0<span class="gmail-m_-4615751837339015999gmail-Apple-converted-space"> </span><a href="mailto:--mgsnode=10.0.0.106@o2ib0" style="text-decoration:underline;color:rgb(149,79,114)" target="_blank">--mgsnode=10.0.0.106@o2ib0</a><span class="gmail-m_-4615751837339015999gmail-Apple-converted-space"> </span>/dev/nvme0n1<span></span></span></p>
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<span lang="EN-US"><span> </span></span></p>
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<span lang="EN-US"> Permanent disk data:<span></span></span></p>
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<span lang="EN-US">Target: birdfs:OST0000<span></span></span></p>
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<span lang="EN-US">Index: 0<span></span></span></p>
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<span lang="EN-US">Lustre FS: birdfs<span></span></span></p>
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<span lang="EN-US">Mount type: ldiskfs<span></span></span></p>
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<span lang="EN-US">Flags: 0x62<span></span></span></p>
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<span lang="EN-US"> (OST first_time update )<span></span></span></p>
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<span lang="EN-US">Persistent mount opts: ,errors=remount-ro<span></span></span></p>
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<span lang="EN-US">Parameters:<span class="gmail-m_-4615751837339015999gmail-Apple-converted-space"> </span><a href="mailto:mgsnode=10.0.0.106@o2ib" style="text-decoration:underline;color:rgb(149,79,114)" target="_blank">mgsnode=10.0.0.106@o2ib</a><span></span></span></p>
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<span lang="EN-US"><span> </span></span></p>
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<span lang="EN-US">device size = 763097MB<span></span></span></p>
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<span lang="EN-US">formatting backing filesystem ldiskfs on /dev/nvme0n1<span></span></span></p>
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<span lang="EN-US"> target name birdfs:OST0000<span></span></span></p>
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<span lang="EN-US"> 4k blocks 195353046<span></span></span></p>
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<span lang="EN-US"> options -J size=400 -I 512 -i 69905 -q -O extents,uninit_bg,dir_nlink,quota,huge_file,flex_bg -G 256 -E resize="4290772992",lazy_journal_init -F<span></span></span></p>
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<span lang="EN-US">mkfs_cmd = mke2fs -j -b 4096 -L birdfs:OST0000 -J size=400 -I 512 -i 69905 -q -O extents,uninit_bg,dir_nlink,quota,huge_file,flex_bg -G 256 -E resize="4290772992",lazy_journal_init -F /dev/nvme0n1 195353046<span></span></span></p>
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<span lang="EN-US">Writing CONFIGS/mountdata<span></span></span></p>
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<span lang="EN-US"><span> </span></span></p>
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<span lang="EN-US"><span> </span></span></p>
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<span lang="EN-US">Looking forward to any replies.<span></span></span></p>
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<span lang="EN-US"><span> </span></span></p>
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<span lang="EN-US">Regards,<span></span></span></p>
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<span lang="EN-US">Bird</span></p>
<br clear="all">
<br>
-- <br>
<div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature">
<div dir="ltr">regards
<div>denny</div>
</div>
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