Hi All, I'm looking for a way to backup GFS data against GFS corrupion. A couple weeks ago my FS was corrupted and I'm not able to repair it due to memory error - it's what may dmesg shows: Node 0 HighMem per-cpu: empty Free pages: 78508kB (0kB HighMem) Active:2060003 inactive:2004573 dirty:0 writeback:0 unstable:0 free:19627 slab:3437 mapped-file:22 mapped-anon:4064873 pagetables:13656 Node 0 DMA free:10828kB min:8kB low:8kB high:12kB active:0kB inactive:0kB present:10428kB pages_scanned:0 all_unreclaimable? yes lowmem_reserve[]: 0 3255 16132 16132 Node 0 DMA32 free:54744kB min:3276kB low:4092kB high:4912kB active:1658160kB inactive:1572852kB present:3333344kB pages_scanned:5178723 all_unreclaimable? yes lowmem_reserve[]: 0 0 12877 12877 Node 0 Normal free:12936kB min:12968kB low:16208kB high:19452kB active:6581884kB inactive:6445152kB present:13186560kB pages_scanned:35577289 all_unreclaimable? yes lowmem_reserve[]: 0 0 0 0 Node 0 HighMem free:0kB min:128kB low:128kB high:128kB active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no lowmem_reserve[]: 0 0 0 0 Node 0 DMA: 3*4kB 0*8kB 4*16kB 4*32kB 4*64kB 1*128kB 2*256kB 1*512kB 1*1024kB 0*2048kB 2*4096kB = 10828kB Node 0 DMA32: 16*4kB 1*8kB 1*16kB 0*32kB 0*64kB 1*128kB 1*256kB 0*512kB 1*1024kB 0*2048kB 13*4096kB = 54744kB Node 0 Normal: 10*4kB 2*8kB 3*16kB 1*32kB 0*64kB 0*128kB 0*256kB 1*512kB 0*1024kB 0*2048kB 3*4096kB = 12936kB Node 0 HighMem: empty 55 pagecache pages Swap cache: add 2826670, delete 2826670, find 34309/65098, race 0+0 Free swap = 0kB Total swap = 10223608kB Free swap: 0kB 4390912 pages of RAM 281043 reserved pages 601 pages shared 0 pages swap cached Out of memory: Killed process 3552, UID 0, (gfs_fsck). gfs_fsck: page allocation failure. order:0, mode:0x201d2 Call Trace: [<ffffffff8000f576>] __alloc_pages+0x2ef/0x308 [<ffffffff80012ed7>] __do_page_cache_readahead+0x96/0x179 [<ffffffff8001386c>] filemap_nopage+0x14c/0x360 [<ffffffff8000898c>] __handle_mm_fault+0x1fa/0xfaa [<ffffffff800c78fb>] generic_file_read+0xac/0xc5 [<ffffffff80067b55>] do_page_fault+0x4cb/0x874 [<ffffffff8005ede9>] error_exit+0x0/0x84 I must say that I'm not sure what is going one cause I have 16G RAM on the server and 64bit OS.... According to the docs gfs.fsck should have needed about 8G of RAM... (the gfs vol size is about 2.7TB). Thanks God I was able to mount it with RO opt. Now I'm looking the way to solve the issue and avoid the similar situation in the future... I'm thinking about some way to "backup" my data. The main gole is to avoid longer downtime. I can even accept some data lost (eg. 1 day or sth...) I was thinking about two scenarions: 1. SAN+GFS2+DRBD the issue is I don't know it is possible. We use 2 nodes with shared SAN storage. I want to backup it on the iscsi with asynchronic way (protocol A in DRBD). The thing is I think it would be possible if we did't use SAN but only local drives... As so far I didn't find any docs considering the following scenario. 2. GFS2 + CLVM + snapshot Which of those is better, more relible? If the 1st one is generally possible (in some way)? Maybe it is some other solution to prevent from GFS corrupion and long long recovery process? What about fsck.gfs2? How fast is it? Thx in advance! -- mr -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
