<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="">
All of the OSTs and MDTs are "independently managed" (have their own connection state between each client and target) so this should be possible, though I don't know of sites that are doing this. Possibly this makes sense to put NVMe flash OSTs on ldiskfs,
and HDD OSTs on ZFS, and then put them in OST pools so that they are managed separately. <br class="">
<div><br class="">
<blockquote type="cite" class="">
<div class="">On Jan 12, 2024, at 10:38, Backer <<a href="mailto:backer.kolo@gmail.com" class="">backer.kolo@gmail.com</a>> wrote:</div>
<br class="Apple-interchange-newline">
<div class="">
<div dir="ltr" class="">Thank you Andreas! How about mixing OSTs? The requirement is to do RAID with small volumes using ZFS and have a large OST. This is to reduce the number of OSTs overall as the cluster being extended. </div>
<br class="">
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Fri, 12 Jan 2024 at 11:26, Andreas Dilger <<a href="mailto:adilger@whamcloud.com" class="">adilger@whamcloud.com</a>> wrote:<br class="">
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
Yes, some systems use ldiskfs for the MDT (for performance) and ZFS for the OSTs (for low-cost RAID). The IOPS performance of ZFS is low vs. ldiskfs, but the streaming bandwidth is fine.
<br class="">
<br class="">
Cheers, Andreas<br class="">
<br class="">
> On Jan 12, 2024, at 08:40, Backer via lustre-discuss <<a href="mailto:lustre-discuss@lists.lustre.org" target="_blank" class="">lustre-discuss@lists.lustre.org</a>> wrote:<br class="">
> <br class="">
> \ufeff<br class="">
> Hi,<br class="">
> <br class="">
> Could we mix ZFS and LDISKFS together in a cluster? <br class="">
> <br class="">
> Thank you,<br class="">
> <br class="">
> <br class="">
> _______________________________________________<br class="">
> lustre-discuss mailing list<br class="">
> <a href="mailto:lustre-discuss@lists.lustre.org" target="_blank" class="">lustre-discuss@lists.lustre.org</a><br class="">
> <a href="http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org" rel="noreferrer" target="_blank" class="">
http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org</a><br class="">
</blockquote>
</div>
</div>
</blockquote>
</div>
<br class="">
<div class="">
<div dir="auto" style="caret-color: rgb(0, 0, 0); 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; text-decoration: none; word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">
<div dir="auto" style="caret-color: rgb(0, 0, 0); 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; text-decoration: none; word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">
<div dir="auto" style="caret-color: rgb(0, 0, 0); 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; text-decoration: none; word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">
<div dir="auto" style="caret-color: rgb(0, 0, 0); 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; text-decoration: none; word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">
<div dir="auto" style="caret-color: rgb(0, 0, 0); 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; text-decoration: none; word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">
<div dir="auto" style="caret-color: rgb(0, 0, 0); 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; text-decoration: none; word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">
<div>Cheers, Andreas</div>
<div>--</div>
<div>Andreas Dilger</div>
<div>Lustre Principal Architect</div>
<div>Whamcloud</div>
<div><br class="">
</div>
<div><br class="">
</div>
<div><br class="">
</div>
</div>
</div>
</div>
</div>
</div>
<br class="Apple-interchange-newline">
</div>
<br class="Apple-interchange-newline">
<br class="Apple-interchange-newline">
</div>
<br class="">
</body>
</html>