> > Just for testing purposes, have you tried pinning rank 1 to some other > directory? Does it still break the CephFS if you stop it? Yes, nothing changed. It's no problem that FS hangs when one of the ranks goes down, we will have standby-reply for all ranks. I don't like that rank which is not pinned to some dir handled some io of this dir or from clients which work with this dir. I mean that I can't robustly and fully separate client IO by ranks. Would it be an option to rather use multiple Filesystems instead of > multi-active for one CephFS? Yes, it's an option. But it is much more complicated in our case. Btw, do you know how many different FS can be created in one cluster? Maybe you know some potential problems with 100-200 FSs in one cluster? ср, 20 нояб. 2024 г. в 17:50, Eugen Block <eblock@xxxxxx>: > Ah, I misunderstood, I thought you wanted an even distribution across > both ranks. > Just for testing purposes, have you tried pinning rank 1 to some other > directory? Does it still break the CephFS if you stop it? I'm not sure > if you can prevent rank 1 from participating, I haven't looked into > all the configs in quite a while. Would it be an option to rather use > multiple Filesystems instead of multi-active for one CephFS? > > Zitat von Александр Руденко <a.rudikk@xxxxxxxxx>: > > > No it's not a typo. It's misleading example) > > > > dir1 and dir2 are pinned to rank 0, but FS and dir1,dir2 can't work > without > > rank 1. > > rank 1 is used for something when I work with this dirs. > > > > ceph 16.2.13, metadata balancer and policy based balancing not used. > > > > ср, 20 нояб. 2024 г. в 16:33, Eugen Block <eblock@xxxxxx>: > > > >> Hi, > >> > >> > After pinning: > >> > setfattr -n ceph.dir.pin -v 0 /fs-mountpoint/dir1 > >> > setfattr -n ceph.dir.pin -v 0 /fs-mountpoint/dir2 > >> > >> is this a typo? If not, you did pin both directories to the same rank. > >> > >> Zitat von Александр Руденко <a.rudikk@xxxxxxxxx>: > >> > >> > Hi, > >> > > >> > I try to distribute all top level dirs in CephFS by different MDS > ranks. > >> > I have two active MDS with rank *0* and *1 *and I have 2 top dirs like > >> > */dir1* and* /dir2*. > >> > > >> > After pinning: > >> > setfattr -n ceph.dir.pin -v 0 /fs-mountpoint/dir1 > >> > setfattr -n ceph.dir.pin -v 0 /fs-mountpoint/dir2 > >> > > >> > I can see next INOS and DNS distribution: > >> > RANK STATE MDS ACTIVITY DNS INOS DIRS CAPS > >> > 0 active c Reqs: 127 /s 12.6k 12.5k 333 505 > >> > 1 active b Reqs: 11 /s 21 24 19 1 > >> > > >> > When I write to dir1 I can see a small amount on Reqs: in rank 1. > >> > > >> > Events in journal of MDS with rank 1: > >> > cephfs-journal-tool --rank=fs1:1 event get list > >> > > >> > 2024-11-20T12:24:42.045056+0300 0xc5c1cb UPDATE: > (scatter_writebehind) > >> > A2037D53 > >> > 2024-11-20T12:24:46.935934+0300 0xc5c629 SESSION: () > >> > 2024-11-20T12:24:47.192012+0300 0xc5c7cd UPDATE: (lock inest > accounted > >> > scatter stat update) > >> > 2024-11-20T12:24:47.904717+0300 0xc5ca0b SESSION: () > >> > 2024-11-20T12:26:46.912719+0300 0xc5ca98 SESSION: () > >> > 2024-11-20T12:26:47.910806+0300 0xc5cc3c SESSION: () > >> > 2024-11-20T12:27:35.746239+0300 0xc5ccc9 SESSION: () > >> > 2024-11-20T12:28:46.923812+0300 0xc5ce63 SESSION: () > >> > 2024-11-20T12:28:47.903066+0300 0xc5d007 SESSION: () > >> > 2024-11-20T12:29:08.063326+0300 0xc5d094 EXPORT: () > >> > di1/A2037D53 > >> > 2024-11-20T12:30:46.909621+0300 0xc5d96f SESSION: () > >> > 2024-11-20T12:30:47.908050+0300 0xc5db13 SESSION: () > >> > 2024-11-20T12:32:46.907649+0300 0xc5dba0 SESSION: () > >> > 2024-11-20T12:32:47.905962+0300 0xc5dd44 SESSION: () > >> > 2024-11-20T12:34:44.349348+0300 0xc5ddd1 SESSIONS: () > >> > > >> > But the main problem, when I stop MDS rank 1 (without any kind of > >> standby) > >> > - FS hangs for all actions. > >> > Is this correct? Is it possible to completely exclude rank 1 from > >> > processing dir1 and not stop io when rank 1 goes down? > >> > _______________________________________________ > >> > ceph-users mailing list -- ceph-users@xxxxxxx > >> > To unsubscribe send an email to ceph-users-leave@xxxxxxx > >> > >> > >> _______________________________________________ > >> ceph-users mailing list -- ceph-users@xxxxxxx > >> To unsubscribe send an email to ceph-users-leave@xxxxxxx > >> > > > > _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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