Hi All, I am wondering if there is some guild lines for MDT disk size. We plan to build a rather small luster cluster with about 200TB disk space, served by about 20 OSS with about 40 (or more) OSTs. The file sizes stored on it will be around 1GB in average. Will a MDT disk with 100 - 200 GB size big enough for it? What is the biggest MDT disk size allowed? Best Regards, Jiawei -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.lustre.org/pipermail/lustre-discuss/attachments/20090820/37011c04/attachment.html
Jiawei, you may want to have a look at section 20.3.2 in the operations manual, it discusses how to size an MDT. From what I understand, a 100GB MDT is more than enough for your ~200.000 files. I think the max MDT size is 8TB. HTH, Arne Jiawei Zhao wrote:> Hi All, > > I am wondering if there is some guild lines for MDT disk size. We plan > to build a rather small luster cluster with about 200TB disk space, > served by about 20 OSS with about 40 (or more) OSTs. The file sizes > stored on it will be around 1GB in average. Will a MDT disk with 100 - > 200 GB size big enough for it? What is the biggest MDT disk size allowed? > > Best Regards, > Jiawei >-------------- next part -------------- A non-text attachment was scrubbed... Name: smime.p7s Type: application/x-pkcs7-signature Size: 6380 bytes Desc: S/MIME Cryptographic Signature Url : http://lists.lustre.org/pipermail/lustre-discuss/attachments/20090820/6b43f343/attachment.bin
On Thursday 20 August 2009, Arne Wiebalck wrote:> Jiawei, > > you may want to have a look at section 20.3.2 in the operations manual, > it discusses how to size an MDT. > > From what I understand, a 100GB MDT is more than enough for your > ~200.000 files.We have several file systems with MDT < 100G and with ~2.000.000 files (and the MDT is nowhere near full). Much depends on how you stripe files (our systems use simple round robin placement of whole files). /Peter> I think the max MDT size is 8TB. > > HTH, > Arne-------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: application/pgp-signature Size: 189 bytes Desc: This is a digitally signed message part. Url : http://lists.lustre.org/pipermail/lustre-discuss/attachments/20090820/483e6221/attachment.bin